keying variable

- λ-shaped negative-resistance device
- absolute pointing device
- absolute value device
- accumulation-mode charge-coupled device
- acoustic correlation device
- acoustic delay device
- acoustic imaging device
- acoustic-surface-wave device
- acoustic-surface-wave interaction charge-coupled device
- acoustic-volume-wave device
- acoustic-wave device
- acoustooptic device
- acoustoresistive device
- active device
- active medium propagation device
- adaptive device
- add-on device
- all-junction device
- aluminum-gate MOS device
- amorphous semiconductor memory device
- amorphous semiconductor switching device
- analog device
- answer device
- antihunt device
- anti-inrush device
- antijamming device
- anti-pumping device
- antisidetone device
- antistatic device
- antistrike device
- AO device
- arc-control device
- array device
- attached device
- attention device
- audible signal device
- audio device
- audio-response device
- augmentative device
- autocorrelation device
- automatic holding device
- automatic-alarm-signal keying device
- avalanche device
- avalanche-effect device
- backup device
- band-compression device
- beam-expanding device
- beam-lead device
- beam-manipulating device
- beam-narrowing device
- beam-transforming device
- bidirectional device
- bipolar device
- bistable device
- bistable optical device
- block device
- BlueTooth device
- bogey electron device
- bubble device
- bubble domain device
- bubble lattice storage device
- bubble memory device
- bucket-brigade charge-coupled device
- bucket-brigade device
- built-in pointing device
- bulk channel charge-coupled device
- bulk-acoustic-wave device
- bulk-charge-coupled device
- bulk-effect device
- bulk-property device
- bulk-type acoustooptic device
- bunching device
- buried channel charge-coupled device
- burst device
- bus-powered device
- callback port protection device
- calling device
- carrier-operated antinoise device
- cascade charge-coupled device
- cascaded thermoelectric device
- center-bonded device
- CFAR device
- character device
- charge-control device
- charge-coupled device
- charge-coupled imaging device
- charge-coupled line imaging device
- charge-coupled storage device
- charge-injection device
- charge-injection imaging device
- charge-transfer device
- charge-trapping device
- chip device
- chip-and-wire device
- clip-on pointing device
- clustered devices
- CMOS device
- coder device
- coherent electroluminescence device
- color imaging device
- COM device
- complex programmable logic device
- compound device
- computer output microfilm device
- conductively connected charge-coupled device
- constant false-alarm ratio device
- consumer device
- contiguous-disk bubble domain device
- controlled avalanche device
- controlled-surface device
- correlation device
- countermeasure devices
- coupling device
- cross-correlation device
- cross-field device
- cryogenic device
- current-access magnetic bubble device
- current-controlled device
- current-controlled differential-negative-resistance device
- current-controlled DNR device
- current-mode logic device
- current-operated device
- custom device
- data entry device
- data preparation device
- data recording device
- deception devices
- decision-making device
- decoding device
- dedicated device
- deformable-mirror device
- DEFT device
- delay device
- dense device
- depletion-mode device
- detecting device
- DI device
- dielectric isolation device
- diffused device
- digit delay device
- digital device
- digital micromirror device
- diode-array imaging device
- direct electronic Fourier transform device
- direct-access storage device
- direct-view device
- direct-viewing device
- discrete device
- disk device
- display device
- distributed diode device
- distributed interaction device
- division device
- D-MOS device
- domain propagation device
- domain-tip device
- double-negative-resistance-device
- double-quantum stimulated-emission device
- dynamically configurable device
- eavesdropping device
- E-beam fabricated device
- EBS device
- edge-bonded device
- EL device
- elastooptic device
- electrically programmable logic device
- electroluminescence device
- electromagnetic device
- electron device
- electron-beam semiconductor device
- electronic device
- electronic imaging device
- electron-optical device
- electrooptical device
- elementary MOS device
- embedded device
- encoding device
- end device
- energy conversion device
- enhancement-mode device
- epiplanar device
- epitaxial-device
- error-sensing device
- exchange-coupled thin-film memory device
- external control device
- false-echo devices
- Faraday-rotation device
- fast-discharge device
- ferrite device
- ferroelectric device
- FET device
- fiber-laser device
- field-access memory device
- field-effect device
- field-effect transistor device
- field-emission device
- field-programmable interconnect device
- file device
- file-protection device
- fixed tap-weight bucket-brigade device
- floating-gate device
- fluidic-device
- follow-up device
- four-layer device
- four-terminal device
- Frame Relay access device
- free-electron device
- freestanding pointing device
- FS device
- full-speed device
- functional device
- galvanomagnetic device
- galvanomagnetic semiconductor device
- gate-array device
- graphic input device
- graphic output device
- gripping device
- groove locating device
- guided-wave acoustooptic device
- guided-wave AO Bragg device
- Gunn device
- Gunn-effect device
- gyromagnetic device
- Hall device
- Hall-effect device
- harbor echo ranging and listening device
- head-cleaning device
- heteroepitaxial device
- heterojunction device
- high-technology device
- high-threshold device
- homing device
- hot-electron device
- human interface device
- hybrid ferromagnet-semiconductor device
- hybrid integrated-circuit device
- hybrid-type device
- I/O device
- identification device
- image-storage device
- imaging device
- implanted device
- incidental radiation device
- industrial data collection device
- infrared charge-coupled device
- input device
- input-output device
- insulated-gate device
- integrated electron device
- integrated injection device
- integrated optic device
- integrating device
- interface device
- interlocking device
- ion-implantation device
- ion-implanted bubble device
- ion-injection electrostatic plasma confinement device
- jelly-bean device
- Josephson device
- Josephson-effect device
- junction device
- junction-gate device
- keying device
- known-good device
- large-area p-n junction device
- laser annealing device
- laser device
- laser welding device
- laser-beam machining device
- leaded device
- leadless device
- left ventricular assist device
- light-detecting device
- light-emitting device
- linear beam device
- linear imaging device
- locked dynamically configurable device
- logic device
- long-channel device
- low-speed device
- low-threshold device
- LS device
- magnetic bubble device
- magnetic detecting device
- magnetic device
- magnetic flux quantum device
- magnetic tunnel junction memory device
- magnetic-wave device
- magnetoelastic-wave device
- magnetoelectronic device
- magnetooptic bubble-domain device
- magnetostatic-wave device
- magnetostrictive device
- magnetotunneling device
- majority-carrier device
- make-and-break device
- manipulating device
- marginal device
- maser device
- matching device
- measurement device
- mechanical switching device
- memory device
- MEMS device
- MEMS-based device
- metal-gate device
- metal-insulator-metal device
- metal-insulator-piezoelectric semiconductor device
- metal-oxide-silicon device
- metal-semiconductor device
- microcomputer device
- microdiscrete device
- microelectromechanical system device
- microelectromechanical system-based device
- microelectronic device
- microfluidic device
- MIDI device
- minority-carrier device
- MIPS device
- MIS device
- MNOS device
- molecule-sized device
- MOS color imaging device
- MOS device
- MOS memory device
- MSW device
- M-type device
- multiaperture device
- multijunction device
- multilayered memory device
- multilevel storage device
- multiple-tap bucket-brigade device
- multiple-unit semiconductor device
- multiport device
- multistable device
- multiterminal device
- n-channel device
- negation device
- negative-resistance device
- night viewing device
- n-n heterojunction device
- noise-rejection device
- nonburst device
- noninverting parametric device
- nonreciprocal field-displacement device
- n-p-n device
- n-terminal device
- one-port device
- open-collector device
- optically coupled device
- optically pumped device
- optoelectronic device
- O-type device
- output device
- overlay device
- oxide-passivated device
- P&P device
- parallel device
- parametric device
- passivated device
- passive device
- pattern recognition device
- p-channel device
- p-channel MOS device
- periodic permanent magnet focusing device
- persistent current device
- persistent-image device
- personal communication device
- photoconducting device
- photoelectric device
- photoemissive device
- photosensitive device
- photovoltaic device
- picking device
- piezoelectric device
- piezomagnetic device
- planar device
- planar-doped barrier device
- plasma device
- plasma-coupled semiconductor device
- plotting device
- plug-and-play device
- plug-in device
- PMOS device
- p-n junction device
- PnP device
- p-n-p device
- p-n-p-n device
- point-contact superconducting device
- pointing device
- polysilicon charge-coupled device
- port protection device
- p-p heterojunction device
- PPM focusing device
- programmable device
- programmable logic device
- protective device
- punch-through device
- pyroelectric thermal imaging device
- quantum-dot resonant tunneling device
- quasioptical device
- quenched domain mode device
- radiation-measuring device
- random-access device
- rapid single flux quantum device
- readout device
- reciprocal device
- recognition device
- rectifying device
- regulating device
- relative pointing device
- restricted radiation device
- reverberation device
- ringing device
- robot control device
- rotating-field bubble device
- rotating-field bubble domain device
- RSFQ device
- safety device
- SAW device
- Schottky barrier semiconductor device
- Schottky device
- Schottky-barrier-gate Gunn-effect digital device
- SCSI device
- security device
- self-powered device
- self-reacting device
- self-synchronous device
- semiconductor device
- semiconductor switching device
- semiconductor-magnetic device
- sensing device
- serial device
- shallow-base device
- short-channel device
- short-circuit-stable device
- silicon imaging device
- silicon-gate MOS memory device
- silicon-on-insulating substrate device
- single-junction device
- single-tap bucket-brigade device
- single-unit semiconductor device
- slot device
- snap-on pointing device
- solid-state device
- SOS device
- sound-absorbing device
- spark-quenching device
- speech recognition device
- spin-wave device
- square-law device
- starting device
- static discharge device
- storage device
- storage display device
- storage-charge device
- stream device
- stream-oriented device
- stroke input device
- superconducting device
- superconducting quantum device
- superconducting quantum interference device
- surface acoustic-wave device
- surface charge-transfer device
- surface mount device
- surface-controlled device
- switching device
- symbolic device
- tape device
- tape-moving device
- TE device
- tensoelectric device
- terminal device
- thermoelectric cooling device
- thermoelectric device
- thermoelectric heating device
- thick-film device
- thin-film device
- Tokamak device
- transferred-electron device
- transferred-electron microwave device
- transit-time device
- traveling magnetic domain memory device
- traveling-wave Gunn effect device
- trip-free mechanical switching device
- tse device
- tube device
- tunnel device
- tunnel emission device
- twisted nematic device
- two-junction bipolar device
- two-port device
- two-terminal device
- ULA device
- uncommitted logic array device
- unidirectional device
- unilateral device
- unpacked device
- vacuum tunnel device
- variable grating mode device
- variable inductance cryogenic device
- vertical junction device
- VGM device
- V-groove MOS device
- virtual device
- visual signal device
- VMOS device
- V-MOS device
- voice-operated device
- voice-operated gain-adjusting device
- voltage-controlled device
- voltage-controlled differential-negative-resistance device
- voltage-controlled DNR device
- voltage-operated device
- wafer printing device
- wireless device
- X-ray detecting device
- YIG device

- acceptance filter
- acoustic filter
- acoustic surface-wave filter
- acoustic-wave filter
- acoustooptical filter
- active filter
- ActiveX server filter
- adaptive filter
- air filter
- air-spaced filter
- all-pass filter
- all-pole filter
- all-zero filter
- ambient-light filter
- amplitude filter
- analog-computer filter
- analog-computer-type filter
- antialiasing filter
- apodized filter
- array-processing filter - band-stop filter
- barometric filter
- barometric air filter
- Bessel filter
- binary filter - biquad filter
- biquartic filter
- birefringent filter
- birefringent optical filter
- bleaching filter
- bogon filter
- Bozo filter
- BP filter
- breather filter
- bridge filter
- bridged-T filter
- broadcast filter
- brute-force filter
- Butterworth filter
- canonical recursive filter
- capacitor-input filter
- carrier transfer filter
- Cauer filter
- cavity filter
- cavity-coupled filter
- CCTT filter
- ceramic filter
- channel filter
- channel-bank filter
- channel-separation filter
- Chebyshev filter
- chirp-generating filter
- choke-input filter
- Christiansen filter
- chroma filter
- click filter
- clutter suppression filter
- C-message filter
- coaxial filter
- coherent memory filter
- color filter
- colored-glass filter
- color separation filter
- comb filter
- compensating filter
- complex spatial filter
- composite filter
- constant-current filter
- constant-K filter
- continuous capacitive tapping transversal filter
- continuous inductive tapping transversal filter
- continuously tunable filter
- continuous resistive tapping transversal filter
- convolution filter
- correction filter
- corrective filter
- crystal filter
- dechirping filter
- deconvolution filter
- decoupling filter
- deemphasis filter
- delay-line filter
- delta-modulation filter
- demodulator filter - dichroic filter
- dielectric filter
- dielectric slab filter
- digital filter
- digital frequency mapping filter
- digitally tuned filter - directional filter
- discrete filter
- discrimination filter
- dispersion filter
- dispersive filter
- dm filter
- Doppler filter
- dynamic tracking filter
- electric filter
- electric-wave filter
- electronically tunable filter
- elliptic filter
- elliptic-function filter
- enhancement filter - Fabry-Perot interference filter
- feed-forward MTI radar filter
- feedthrough filter
- fiber filter
- finite impulse-response filter
- finite-duration impulse-response filter
- fin-line filter
- FIR filter
- first-order filter
- fixed filter
- fixed-frequency filter
- fixed-point digital filter
- floating-point digital filter
- formant filter
- Fourier transform filter
- four-port filter
- FP filter
- Frechet filter
- frequency filter
- frustrated total reflection filter
- gelatin filter
- generating filter
- glare filter
- glass filter
- graded filter
- gray filter - harmonic filter
- heat filter
- HF filter
- high filter
- high-cut filter
- high-frequency filter
- high-order filter
- high-pass filter
- hiss filter
- hologram filter
- holographic filter
- IIR filter
- inductive-input filter
- infinite impulse-response filter
- infinite-duration impulse-response filter
- infrared filter
- in-line filter
- integrated-and-dump filter
- integrating filter
- interference filter
- interferential polarizational filter
- intermediate-frequency filter
- interpolation filter
- interstage filter
- inverse filter
- inverse-feedback filter
- ion-implanted array filter
- IR filter
- iterative filter
- junction filter
- Kalman filter
- key-click filter
- keying filter
- kill filter
- L-filter
- ladder-type filter
- lattice filter
- lead-zirconate-titanate filter
- leapfrog filter
- light filter
- line filter
- linear filter
- linear FM pulse compression filter
- linear space-invariant filter
- linear space-noninvariant filter
- liquid filter
- long-wavelength cutoff filter
- loop filter
- lossless filter
- low filter
- low-and-high-pass filter
- low-cut filter - L-section filter
- L-type filter
- lumped-constant filter
- Lyot filter
- magic-T filter
- magnetically tuned filter
- magnetooptical filter
- magnetostatic-wave filter
- magnetostrictive filter
- matched filter
- matched spatial filter
- matching filter
- m-derived filter
- mechanical filter
- mechanical-wave filter
- median filter
- microwave filter
- MIDI filter
- minimum-delay filter
- minimum-phase filter
- mismatched filter
- mode filter
- modulation filter
- multiple-bandpass filter
- multiple-reflection filter
- multiple-resonant-circuit filter
- multi-resonator filter
- multisection filter
- multistage filter
- narrow-band filter
- narrow-cut filter
- ND filter
- network filter
- neutral filter
- neutral-density filter
- neutral gray filter
- noise filter
- nonlinear filter
- nonrecursive filter
- nonselective filter
- notch filter
- n-section filter
- one-dimensional median filter
- optical filter
- packet filter
- parallel-T notch filter
- parametric filter
- partitioned adaptive filter
- passive filter
- phase filter
- photopic filter
- piezoelectric filter
- piezoelectric ceramics filter
- piezoelectric crystal filter
- pi-section filter
- plasma electroacoustic resonance filter
- plastics filter
- polarization interference filter
- polarizing filter
- polaroid filter
- pole-zero filter
- polynomial filter
- pop filter
- postemphasis filter
- postequalization filter
- powder filter
- power-line filter
- powerpack filter
- prediction filter - preequalization filter
- prewhitening filter
- programmable binary transversal filter
- pseudo-noise matched filter
- pulse-compression filter
- PZT filter
- quadrature filter
- quasi-optical filter
- radio-frequency interference filter
- range filter
- RC-filter
- recirculating filter
- recirculating air filter
- rectifier filter - reflection filter
- reflection holographic filter
- rejection filter
- resistance-capacitance filter
- resonant filter
- reverberation suppression filter
- RF filter
- RFI filter
- ripple filter
- roof filter
- rumble filter
- sampled-data filter
- SAW filter
- SC filter
- scatter filter
- scratch filter
- seasonal filter
- selective filter
- sending filter
- separation filter
- series m-derived filter
- SFG filter
- shaping filter
- sharp-cutoff filter
- short-term adaptive filter
- short-wavelength cutoff filter
- shunt m-derived filter
- signal-flow-graph filter
- signal-separation filter
- single-sideband filter
- slope filter
- slot filter
- slotted filter
- smoothing filter
- solid organic-dye filter
- solid-state filter
- sound-effect filter
- spatial filter
- spatial frequencyfilter
- spatial median filter
- spin-wave filter
- stacked crystal filter
- state-variable filter
- strip-line filter
- superconducting filter
- surface-acoustic-wave filter
- surface-wave chirp filter - switched-capacitor filter
- systolic filter
- tapped-delay-line filter
- tee filter
- temporal median filter
- thin-film filter
- thin-metal-film filter
- through filter
- time-dependent filter
- time-invariant filter
- time-varying filter
- tracking filter
- transmission filter
- transmission-line filter
- transparency filter
- transversal filter
- T-section filter
- tunable filter
- tuned filter
- twin-T filter
- two-dimensional filter
- two-dimensional median filter
- two-port filter
- ultraviolet filter
- unvoiced filter
- UV filter
- variable filter
- velocity filter
- vestigial-sideband filter
- voice filter
- voltage-controlled variable-bandwidth filter
- wave filter
- waveguide filter
- weighted filter
- whitening filter
- wide-angle filter
- wide-band filter
- wide-cut filter
- Wiener filter
- Wratten filter
- YIG filter
- yttrium-iron garnet filter
- zero-memory filter

- acoustooptic modulation
- adaptive modulation - A-law delta modulation
- A-law pulse-code modulation
- amplitude modulation
- amplitude and angle modulation
- amplitude-frequency modulation
- amplitude-phase modulation
- amplitude-pulse modulation
- analog modulation
- angle modulation
- anode modulation
- area-delta and zero-cross modulation
- Armstrong modulation
- asymmetric amplitude modulation
- asymmetric delta modulation
- asynchronous delta modulation
- asynchronous delta-sigma modulation
- audio frequency modulation
- audio frequency-shift modulation
- balanced modulation
- baseband modulation
- base-conductivity modulation
- base-thickness modulation
- base-width modulation
- beam modulation
- beam-current modulation
- binary-pulse-code modulation - brightness modulation
- brilliance modulation
- buzzer modulation
- carrier modulation
- carrierless amplitude-phase modulation
- carrier-noise modulation
- carrier residual modulation
- cathode modulation
- cathode pulse modulation
- cavity modulation
- CD modulation
- channel-length modulation
- charge-density modulation
- chirp modulation
- choke modulation
- chopper modulation
- chroma modulation
- chrominance modulation
- clipped-noise modulation
- coherent phase-shift keying modulation
- collector modulation
- companded delta modulation
- companded frequency modulation - compound modulation
- conductivity modulation
- constant-current modulation
- constant-envelope modulation
- continuous delta modulation - control-electrode modulation
- controlled-carrier modulation
- convection-current modulation
- conventional delta modulation
- cosine modulation
- coupling modulation
- CPSK modulation
- cross modulation
- deep modulation
- delay modulation
- delta modulation
- delta-sigma modulation
- density modulation
- difference-in-depth modulation
- differential modulation - digital delta modulation - direct modulation
- discrete adaptive delta modulation
- discrete frequency modulation
- displacement modulation
- distortionless modulation
- doping modulation
- double modulation
- double-frequency modulation
- double-integration delta modulation
- double-integration delta-sigma modulation
- double-sideband modulation
- double-sideband amplitude modulation
- downward modulation
- dual modulation - effective percentage modulation - electrical modulation
- electrooptic modulation
- environmental modulation
- exponential delta modulation
- exponential delta-sigma modulation
- external modulation
- externally companded delta modulation
- extraneous modulation
- facsimile modulation
- Faraday modulation
- Faraday-rotation modulation
- FH/DS modulation
- field modulation
- field-effect modulation
- first-order constant-factor delta modulation
- floating-carrier modulation
- fork modulation
- fork-tone modulation
- frequency modulation
- frequency-amplitude modulation
- frequency-hopped/direct sequence modulation
- frequency-hopping modulation
- frequency-shift modulation
- gate-bias modulation
- grid modulation
- grid-pulse modulation
- group modulation
- group-velocity modulation
- Hall-effect modulation
- Heising modulation
- high-index frequency modulation - hum modulation
- hybrid modulation
- hyperbolic frequency modulation
- in-cavity modulation - independent-sideband modulation
- indirect modulation
- indirect frequency modulation
- inductance-tube modulation
- instantaneously adaptive delta modulation
- instantaneously companded delta modulation
- intensity modulation
- interference modulation
- internal modulation
- intracavity modulation
- inversion modulation
- isochronous modulation
- Kerr-cell modulation
- key modulation
- laser modulation
- lateral modulation
- length modulation
- lifetime modulation
- light modulation
- light-induced barrier modulation
- linear modulation - linear pulse-code modulation - logarithmic phase modulation
- loss modulation
- low-level modulation
- luminance modulation
- magnetooptic modulation
- mapping delta modulation
- maximum percentage modulation
- modified frequency modulation - multi-level pulse-code modulation
- multiple modulation
- multiplex frequency modulation
- mutual-interference modulation - negative modulation
- negative facsimile modulation
- noise modulation
- nonpolar modulation
- on-off modulation
- outphasing modulation
- parabolic frequency modulation
- percent modulation
- percentage modulation
- permutation modulation
- phase modulation
- phase-difference modulation
- phase-velocity modulation
- piezoelectrooptic light modulation
- pitch-companded delta modulation
- plate modulation
- plate-and-screen-grid modulation
- plate-pulse modulation
- PN modulation
- polar modulation
- polarization modulation
- position modulation
- positive modulation
- positive facsimile modulation
- predictive coding delta modulation
- product modulation
- pseudonoise modulation
- pseudorandom modulation
- pulse modulation
- pulse-amplitude modulation
- pulse-code modulation
- pulse-count modulation
- pulse-delay modulation - pulse-interval modulation
- pulse-length modulation
- pulse-numbers modulation
- pulse-phase modulation - pulse-spacing modulation
- pulse-time modulation - quadratic frequency modulation
- quadrature modulation - raised-cosine modulation
- reflection modulation
- reset delta modulation
- residual modulation
- robust delta modulation
- rotor modulation
- satellite repeater modulation - screen-grid modulation
- self-modulation
- self-phase modulation
- self-pulse modulation
- series modulation
- series-coupled collector modulation
- sigma-delta modulation
- sine modulation - single sideband amplitude modulation-suppressed carrier - single-tone modulation
- smoothed-phase modulation
- sound modulation
- space modulation
- space-time modulation
- spark gap modulation
- spatial modulation
- spectral modulation
- speech-reiteration delta modulation
- spread-spectrum modulation
- spurious modulation
- square-law modulation
- square-wave modulation
- SSB modulation
- Stark modulation
- start-stop modulation
- statistical delta modulation
- stereo frequency modulation
- subcarrier modulation - suppressor-grid modulation
- swept frequency modulation - symmetrical modulation
- synchronous modulation
- tamed frequency modulation
- tangent frequency modulation
- telemetering modulation
- terrestrial repeater modulation
- time modulation
- tone modulation
- transformer-coupled collector modulation
- transit-time modulation
- transmission modulation
- trapezoidal frequency modulation - two-tone modulation
- unity modulation
- upward modulation
- variable-carrier modulation - velocity variation modulation - video modulation
- voice modulation
- V-shaped frequency modulation
- waveform tracking delta modulation
- Webster modulation
- weighted pulse-code modulation
- wide-band frequency modulation
- wobble modulation
- Z-axis modulation
- zig-zag modulation

- acceptance filter
- acoustic filter
- acoustic surface-wave filter
- acoustic-wave filter
- acoustooptical filter
- active filter
- ActiveX server filter
- adaptive filter
- air filter
- air-spaced filter
- all-pass filter
- all-pole filter
- all-zero filter
- ambient-light filter
- amplitude filter
- analog-computer filter
- analog-computer-type filter
- antialiasing filter
- apodized filter
- array-processing filter
- avalanche matched filter
- balanced filter
- band-elimination filter
- band-exclusion filter
- bandpass filter
- band-rejection filter
- band-splitting filter
- band-stop filter
- barometric air filter
- barometric filter
- Bessel filter
- binary filter
- binary transversal filter
- binomial filter
- biquad filter
- biquartic filter
- birefringent filter
- birefringent optical filter
- bleaching filter
- bogon filter
- Bozo filter
- BP filter
- breather filter
- bridge filter
- bridged-T filter
- broadcast filter
- brute-force filter
- Butterworth filter
- canonical recursive filter
- capacitor-input filter
- carrier transfer filter
- Cauer filter
- cavity filter
- cavity-coupled filter
- CCTT filter
- ceramic filter
- channel filter
- channel-bank filter
- channel-separation filter
- Chebyshev filter
- chirp-generating filter
- choke-input filter
- Christiansen filter
- chroma filter
- click filter
- clutter suppression filter
- C-message filter
- coaxial filter
- coherent memory filter
- color filter
- color separation filter
- colored-glass filter
- comb filter
- compensating filter
- complex spatial filter
- composite filter
- constant-current filter
- constant-K filter
- continuous capacitive tapping transversal filter
- continuous inductive tapping transversal filter
- continuous resistive tapping transversal filter
- continuously tunable filter
- convolution filter
- correction filter
- corrective filter
- crystal filter
- dechirping filter
- deconvolution filter
- decoupling filter
- deemphasis filter
- delay-line filter
- delta-modulation filter
- demodulator band filter
- demodulator filter
- dereverberation filter
- dichroic filter
- dielectric filter
- dielectric slab filter
- digital filter
- digital frequency mapping filter
- digital matched filter
- digital spectral mapping filter
- digitally tuned filter
- directional filter
- discrete filter
- discrimination filter
- dispersion filter
- dispersive filter
- dm filter
- Doppler filter
- dynamic tracking filter
- electric filter
- electric-wave filter
- electronically tunable filter
- elliptic filter
- elliptic-function filter
- enhancement filter
- extended Kalman filter
- Fabry-Perot filter
- Fabry-Perot interference filter
- feed-forward MTI radar filter
- feedthrough filter
- fiber filter
- finite impulse-response filter
- finite-duration impulse-response filter
- fin-line filter
- FIR filter
- first-order filter
- fixed filter
- fixed-frequency filter
- fixed-point digital filter
- floating-point digital filter
- formant filter
- Fourier transform filter
- four-port filter
- FP filter
- Frechet filter
- frequency filter
- frustrated total reflection filter
- gelatin filter
- generating filter
- glare filter
- glass filter
- graded filter
- gray filter
- grounded-capacitor low-pass filter
- gyrator filter
- harmonic filter
- heat filter
- HF filter
- high filter
- high-cut filter
- high-frequency filter
- high-order filter
- high-pass filter
- hiss filter
- hologram filter
- holographic filter
- IIR filter
- inductive-input filter
- infinite impulse-response filter
- infinite-duration impulse-response filter
- infrared filter
- in-line filter
- integrated-and-dump filter
- integrating filter
- interference filter
- interferential polarizational filter
- intermediate-frequency filter
- interpolation filter
- interstage filter
- inverse filter
- inverse-feedback filter
- ion-implanted array filter
- IR filter
- iterative filter
- junction filter
- Kalman filter
- key-click filter
- keying filter
- kill filter
- ladder-type filter
- lattice filter
- lead-zirconate-titanate filter
- leapfrog filter
- L-filter
- light filter
- line filter
- linear filter
- linear FM pulse compression filter
- linear space-invariant filter
- linear space-noninvariant filter
- liquid filter
- long-wavelength cutoff filter
- loop filter
- lossless filter
- low filter
- low-and-high-pass filter
- low-cut filter
- low-pass filter
- LP filter
- L-section filter
- L-type filter
- lumped-constant filter
- Lyot filter
- magic-T filter
- magnetically tuned filter
- magnetooptical filter
- magnetostatic-wave filter
- magnetostrictive filter
- matched filter
- matched spatial filter
- matching filter
- m-derived filter
- mechanical filter
- mechanical-wave filter
- median filter
- microwave filter
- MIDI filter
- minimum-delay filter
- minimum-phase filter
- mismatched filter
- mode filter
- modulation filter
- multiple-bandpass filter
- multiple-reflection filter
- multiple-resonant-circuit filter
- multi-resonator filter
- multisection filter
- multistage filter
- narrow-band filter
- narrow-cut filter
- ND filter
- network filter
- neutral filter
- neutral gray filter
- neutral-density filter
- noise filter
- nonlinear filter
- nonrecursive filter
- nonselective filter
- notch filter
- n-section filter
- one-dimensional median filter
- optical filter
- packet filter
- parallel-T notch filter
- parametric filter
- partitioned adaptive filter
- passive filter
- phase filter
- photopic filter
- piezoelectric ceramics filter
- piezoelectric crystal filter
- piezoelectric filter
- pi-section filter
- plasma electroacoustic resonance filter
- plastics filter
- polarization interference filter
- polarizing filter
- polaroid filter
- pole-zero filter
- polynomial filter
- pop filter
- postemphasis filter
- postequalization filter
- powder filter
- power-line filter
- powerpack filter
- prediction filter
- prediction-error filter
- preemphasis filter
- preequalization filter
- prewhitening filter
- programmable binary transversal filter
- pseudo-noise matched filter
- pulse-compression filter
- PZT filter
- quadrature filter
- quasi-optical filter
- radio-frequency interference filter
- range filter
- RC-filter
- recirculating air filter
- recirculating filter
- rectifier filter
- recurrent extended Kalman filter
- recursive filter
- reflection filter
- reflection holographic filter
- rejection filter
- resistance-capacitance filter
- resonant filter
- reverberation suppression filter
- RF filter
- RFI filter
- ripple filter
- roof filter
- rumble filter
- sampled-data filter
- SAW filter
- SC filter
- scatter filter
- scratch filter
- seasonal filter
- selective filter
- sending filter
- separation filter
- series m-derived filter
- SFG filter
- shaping filter
- sharp-cutoff filter
- short-term adaptive filter
- short-wavelength cutoff filter
- shunt m-derived filter
- signal-flow-graph filter
- signal-separation filter
- single-sideband filter
- slope filter
- slot filter
- slotted filter
- smoothing filter
- solid organic-dye filter
- solid-state filter
- sound-effect filter
- spatial filter
- spatial frequency filter
- spatial median filter
- spin-wave filter
- stacked crystal filter
- state-variable filter
- strip-line filter
- superconducting filter
- surface-acoustic-wave filter
- surface-wave chirp filter
- surface-wave comb filter
- swept filter
- switched-capacitor filter
- systolic filter
- tapped-delay-line filter
- tee filter
- temporal median filter
- thin-film filter
- thin-metal-film filter
- through filter
- time-dependent filter
- time-invariant filter
- time-varying filter
- tracking filter
- transmission filter
- transmission-line filter
- transparency filter
- transversal filter
- T-section filter
- tunable filter
- tuned filter
- twin-T filter
- two-dimensional filter
- two-dimensional median filter
- two-port filter
- ultraviolet filter
- unvoiced filter
- UV filter
- variable filter
- velocity filter
- vestigial-sideband filter
- voice filter
- voltage-controlled variable-bandwidth filter
- wave filter
- waveguide filter
- weighted filter
- whitening filter
- wide-angle filter
- wide-band filter
- wide-cut filter
- Wiener filter
- Wratten filter
- YIG filter
- yttrium-iron garnet filter
- zero-memory filter

- acoustooptic modulation
- adaptive delta modulation
- adaptive differential pulse-code modulation
- adaptive modulation
- adaptive pulse-code modulation
- ADOX modulation
- A-law delta modulation
- A-law pulse-code modulation
- amplitude and angle modulation
- amplitude modulation
- amplitude-frequency modulation
- amplitude-phase modulation
- amplitude-pulse modulation
- analog modulation
- angle modulation
- anode modulation
- area-delta and zero-cross modulation
- Armstrong modulation
- asymmetric amplitude modulation
- asymmetric delta modulation
- asynchronous delta modulation
- asynchronous delta-sigma modulation
- audio frequency modulation
- audio frequency-shift modulation
- balanced modulation
- baseband modulation
- base-conductivity modulation
- base-thickness modulation
- base-width modulation
- beam modulation
- beam-current modulation
- binary-pulse-code modulation
- biphase modulation
- block companded pulse-code modulation
- brightness modulation
- brilliance modulation
- buzzer modulation
- carrier modulation
- carrier residual modulation
- carrierless amplitude-phase modulation
- carrier-noise modulation
- cathode modulation
- cathode pulse modulation
- cavity modulation
- CD modulation
- channel-length modulation
- charge-density modulation
- chirp modulation
- choke modulation
- chopper modulation
- chroma modulation
- chrominance modulation
- clipped-noise modulation
- coherent phase-shift keying modulation
- collector modulation
- companded delta modulation
- companded frequency modulation
- compatible quadrature amplitude modulation
- composition modulation
- compound modulation
- conductivity modulation
- constant-current modulation
- constant-envelope modulation
- continuous delta modulation
- continuously variable-slope delta-modulation
- continuous-wave modulation
- control-electrode modulation
- controlled-carrier modulation
- convection-current modulation
- conventional delta modulation
- cosine modulation
- coupling modulation
- CPSK modulation
- cross modulation
- deep modulation
- delay modulation
- delta modulation
- delta-sigma modulation
- density modulation
- difference-in-depth modulation
- differential modulation
- differential pulse-code modulation
- digital delta modulation
- digital modulation
- digital phase modulation
- digitally controlled delta modulation
- direct modulation
- discrete adaptive delta modulation
- discrete frequency modulation
- displacement modulation
- distortionless modulation
- doping modulation
- double modulation
- double-frequency modulation
- double-integration delta modulation
- double-integration delta-sigma modulation
- double-sideband amplitude modulation
- double-sideband modulation
- downward modulation
- dual modulation
- dynamic adaptive multiple quadrature amplitude modulation
- echo modulation
- effective percentage modulation
- eight-to-fourteen modulation
- elastooptic modulation
- electrical modulation
- electrooptic modulation
- environmental modulation
- exponential delta modulation
- exponential delta-sigma modulation
- external modulation
- externally companded delta modulation
- extraneous modulation
- facsimile modulation
- Faraday modulation
- Faraday-rotation modulation
- FH/DS modulation
- field modulation
- field-effect modulation
- first-order constant-factor delta modulation
- floating-carrier modulation
- fork modulation
- fork-tone modulation
- frequency modulation
- frequency-amplitude modulation
- frequency-hopped/direct sequence modulation
- frequency-hopping modulation
- frequency-shift modulation
- gate-bias modulation
- grid modulation
- grid-pulse modulation
- group modulation
- group-velocity modulation
- Hall-effect modulation
- Heising modulation
- high-index frequency modulation
- high-information delta modulation
- high-level modulation
- hum modulation
- hybrid modulation
- hyperbolic frequency modulation
- in-cavity modulation
- incidental carrier phase modulation
- incidental frequency modulation
- independent-sideband modulation
- indirect frequency modulation
- indirect modulation
- inductance-tube modulation
- instantaneously adaptive delta modulation
- instantaneously companded delta modulation
- intensity modulation
- interference modulation
- internal modulation
- intracavity modulation
- inversion modulation
- isochronous modulation
- Kerr-cell modulation
- key modulation
- laser modulation
- lateral modulation
- length modulation
- lifetime modulation
- light modulation
- light-induced barrier modulation
- linear delta modulation
- linear frequency modulation
- linear modulation
- linear pulse-code modulation
- line-type modulation
- logarithmic companded pulse-code modulation
- logarithmic phase modulation
- loss modulation
- low-level modulation
- luminance modulation
- magnetooptic modulation
- mapping delta modulation
- maximum percentage modulation
- modified frequency modulation
- modified modified frequency modulation
- multi-level delta modulation
- multi-level pulse-code modulation
- multiple modulation
- multiplex frequency modulation
- mutual-interference modulation
- narrow-band frequency modulation
- N-ary pulse-code modulation
- negative facsimile modulation
- negative modulation
- noise modulation
- nonpolar modulation
- on-off modulation
- outphasing modulation
- parabolic frequency modulation
- percent modulation
- percentage modulation
- permutation modulation
- phase modulation
- phase-difference modulation
- phase-velocity modulation
- piezoelectrooptic light modulation
- pitch-companded delta modulation
- plate modulation
- plate-and-screen-grid modulation
- plate-pulse modulation
- PN modulation
- polar modulation
- polarization modulation
- position modulation
- positive facsimile modulation
- positive modulation
- predictive coding delta modulation
- product modulation
- pseudonoise modulation
- pseudorandom modulation
- pulse delta modulation
- pulse group delta modulation
- pulse modulation
- pulse-amplitude modulation
- pulse-code modulation
- pulse-count modulation
- pulse-delay binary modulation
- pulse-delay modulation
- pulse-duration modulation
- pulse-frequency modulation
- pulse-interval modulation
- pulse-length modulation
- pulse-numbers modulation
- pulse-phase modulation
- pulse-polarization binary modulation
- pulse-repetition rate modulation
- pulse-spacing modulation
- pulse-time modulation
- pulse-width modulation
- Q modulation
- quadratic frequency modulation
- quadrature modulation
- quadrature-amplitude modulation
- quantized frequency modulation
- quantized pulse modulation
- quantized pulse-position modulation
- quiescent-carrier modulation
- raised-cosine modulation
- reflection modulation
- reset delta modulation
- residual modulation
- robust delta modulation
- rotor modulation
- satellite repeater modulation
- scanning-velocity modulation
- scan-velocity modulation
- screen-grid modulation
- self-modulation
- self-phase modulation
- self-pulse modulation
- series modulation
- series-coupled collector modulation
- sigma-delta modulation
- sine modulation
- single sideband amplitude modulation
- single sideband amplitude modulation-suppressed carrier
- single sideband modulation
- single-sideband frequency modulation
- single-sided angle modulation
- single-tone modulation
- smoothed-phase modulation
- sound modulation
- space modulation
- space-time modulation
- spark gap modulation
- spatial modulation
- spectral modulation
- speech-reiteration delta modulation
- spread-spectrum modulation
- spurious modulation
- square-law modulation
- square-wave modulation
- SSB modulation
- Stark modulation
- start-stop modulation
- statistical delta modulation
- stereo frequency modulation
- subcarrier frequency modulation
- subcarrier modulation
- suppressed-carrier modulation
- suppressor-grid modulation
- swept frequency modulation
- syllabically companded delta modulation
- syllabically companded pulse-code modulation
- symmetrical modulation
- synchronous modulation
- tamed frequency modulation
- tangent frequency modulation
- telemetering modulation
- terrestrial repeater modulation
- time modulation
- tone modulation
- transformer-coupled collector modulation
- transit-time modulation
- transmission modulation
- trapezoidal frequency modulation
- trellis coded modulation
- two-bit pulse-code modulation
- two-tone modulation
- unity modulation
- upward modulation
- variable-carrier modulation
- variable-slope delta modulation
- velocity modulation
- velocity variation modulation
- vestigial-sideband amplitude modulation
- vestigial-sideband modulation
- vibration modulation
- video modulation
- voice modulation
- V-shaped frequency modulation
- waveform tracking delta modulation
- Webster modulation
- weighted pulse-code modulation
- wide-band frequency modulation
- wobble modulation
- Z-axis modulation
- zig-zag modulation

- acoustic frequency
- acoustical frequency
- actual frequency
- air-ground radio frequency
- air-to-ground radio frequency
- alias frequency
- alpha cutoff frequency
- alternate frequency
- angular frequency
- antenna resonant frequency
- antiferromagnetic resonance frequency
- antiresonant frequency
- anti-Stokes frequency
- assigned frequency
- atomic frequency
- audio frequency
- aural center frequency
- authorized frequency
- avalanche frequency
- base frequency
- base-transport cutoff frequency
- basic frequency
- bass frequency
- beat frequency
- beta cutoff frequency
- bias frequency
- Bragg frequency
- break frequency
- bubble-propagation frequency
- bus frequency
- carrier frequency
- center frequency
- channel frequency
- characteristic frequency
- chopping frequency
- circular frequency
- clock frequency
- co-channel sound frequency
- collision frequency
- combination frequency
- commercial frequency
- complex frequency
- constant frequency
- core frequency
- corner frequency
- critical frequency
- critical fusion frequency
- crossover frequency
- cumulative relative frequency
- cutoff frequency
- cyclotron frequency
- data frequency
- data communications frequency
- 3-dB frequency
- dedicated frequency
- difference frequency
- diffusion frequency
- distress frequency
- Doppler frequency
- Doppler-beat frequency
- Doppler-shifted frequency
- down-link frequency
- drift frequency
- driving frequency
- dynamic-scattering cutoff frequency
- echo frequency
- electron Langmuir frequency
- electron paramagnetic resonance frequency
- electron plasma frequency
- expected frequency
- extinction frequency
- extremely high frequency
- extremely low frequency
- facsimile picture frequency
- ferrimagnetic-resonance frequency
- ferromagnetic-resonance frequency
- field frequency
- fixed frequency
- flicker-fusion frequency
- flutter frequency
- folding frequency
- forward-bias cutoff frequency
- frame frequency
- free-running frequency
- fundamental frequency
- fundamental scanning frequency
- fusion frequency
- gap frequency
- gliding frequency
- ground-air frequency
- ground-to-air frequency
- group frequency
- Gunn frequency
- half-power frequency
- harmonic frequency
- helicon frequency
- heterodyne frequency
- high frequency
- highest probable frequency
- horizontal-line frequency
- horizontal-scanning frequency
- hyperfine frequency
- hyperfine transition frequency
- hyperhigh frequency
- idler frequency
- image frequency
- imaginery frequency
- IMPATT-frequency
- impingement frequency
- impulse frequency - instantaneous frequency
- intercarrier frequency
- intermediate frequency
- intermodulation frequency
- intermodulation component frequency
- inversion-layer cutoff frequency
- ion cyclotron frequency
- ionization frequency
- ion plasma frequency
- jittered pulse-recurrence frequency
- Josephson frequency
- keying frequency
- knee frequency
- Langmuir plasma frequency
- Larmor frequency
- laser-frequency
- laser-emission-frequency
- lattice vibration frequency
- line frequency
- line screen frequency
- lobe frequency
- local-oscillator frequency
- locking frequency
- low frequency
- lower side frequency - lowest useful high frequency
- magnetohydrodynamic frequency
- magnetoplasma frequency
- mains frequency
- maser frequency
- maser-emission frequency
- master frequency
- maximum frequency of oscillation
- maximum keying frequency
- maximum modulating frequency - microwave frequency
- midband frequency
- mode frequency
- modulation frequency
- multiple frequency
- natural frequency
- nominal frequency
- notch frequency
- note frequency
- Nyquist frequency
- observed frequency
- operating frequency
- optical frequency - photoelectric threshold frequency
- picture frequency
- piezoelectric crystal antiresonant frequency
- piezoelectric crystal resonant frequency
- pilot frequency
- plasma frequency
- power frequency
- power-line frequency
- precession frequency
- primary frequency
- pulse-recurrence frequency - pumping frequency
- quasi-optical frequency
- quench frequency
- quenching frequency
- quiescent frequency
- radian frequency
- radio frequency
- rated frequency
- reactive cutoff frequency
- real frequency
- reference frequency
- relative frequency
- relative frequency
- repetition frequency
- resistive cutoff frequency
- resonance frequency
- resonant frequency
- rest frequency
- resting frequency
- ringing frequency
- ripple frequency
- scan frequency
- scanning-line frequency
- screen frequency
- secondary frequency
- second-channel frequency
- self-neutralization frequency
- self-resonant frequency
- SH frequency
- side frequency
- sonic frequency
- sound frequency
- sound carrier frequency
- sound center frequency
- space frequency
- spark frequency
- spatial frequency
- speech frequency
- spike frequency
- spin frequency
- spot frequency
- standard frequency
- Stokes frequency
- subaudio frequency
- subcarrier frequency
- subharmonic frequency
- sub-Nyquist frequency
- subsonic frequency
- sub-telephone frequency
- sum frequency
- summation frequency
- superaudio frequency - super-telephone frequency
- supply frequency
- suppression frequency
- sweep frequency
- synchronizing frequency
- threshold frequency - toggle frequency
- tone frequency
- top baseband frequency
- transition frequency
- transit-time frequency
- transit-time cutoff frequency
- transmission frequency
- TRAPATT frequency
- trapped plasma frequency
- treble frequency
- turnover frequency
- ultra-audible frequency - undamped frequency
- uniform precession frequency
- unity-gain frequency
- up-link frequency
- upper side frequency
- variable frequency
- vertical frequency - video frequency
- vision frequency
- vision carrier frequency
- visual carrier frequency
- voice frequency
- voltage gain cutoff frequency
- waveguide cutoff frequency
- window frequency
- wow frequency

- absolute cutoff frequency
- acoustic frequency
- acoustical frequency
- actual frequency
- air-ground radio frequency
- air-to-ground radio frequency
- alias frequency
- alpha cutoff frequency
- alternate frequency
- angular frequency
- antenna resonant frequency
- antiferromagnetic resonance frequency
- antiresonant frequency
- anti-Stokes frequency
- assigned frequency
- atomic frequency
- audio frequency
- aural center frequency
- authorized frequency
- avalanche frequency
- base frequency
- base-transport cutoff frequency
- basic frequency
- bass frequency
- beat frequency
- beta cutoff frequency
- bias frequency
- Bragg frequency
- break frequency
- bubble-propagation frequency
- bus frequency
- carrier frequency
- center frequency
- channel frequency
- characteristic frequency
- chopping frequency
- circular frequency
- clock frequency
- co-channel sound frequency
- collision frequency
- combination frequency
- commercial frequency
- complex frequency
- constant frequency
- core frequency
- corner frequency
- critical frequency
- critical fusion frequency
- crossover frequency
- cumulative relative frequency
- cutoff frequency
- cyclotron frequency
- data communications frequency
- data frequency
- dedicated frequency
- difference frequency
- diffusion frequency
- distress frequency
- Doppler frequency
- Doppler-beat frequency
- Doppler-shifted frequency
- down-link frequency
- drift frequency
- driving frequency
- dynamic-scattering cutoff frequency
- echo frequency
- electron Langmuir frequency
- electron paramagnetic resonance frequency
- electron plasma frequency
- expected frequency
- extinction frequency
- extremely high frequency
- extremely low frequency
- facsimile picture frequency
- ferrimagnetic-resonance frequency
- ferromagnetic-resonance frequency
- field frequency
- fixed frequency
- flicker-fusion frequency
- flutter frequency
- folding frequency
- forward-bias cutoff frequency
- frame frequency
- free-running frequency
- fundamental frequency
- fundamental scanning frequency
- fusion frequency
- gap frequency
- gliding frequency
- ground-air frequency
- ground-to-air frequency
- group frequency
- Gunn frequency
- half-power frequency
- harmonic frequency
- helicon frequency
- heterodyne frequency
- high frequency
- highest probable frequency
- horizontal-line frequency
- horizontal-scanning frequency
- hyperfine frequency
- hyperfine transition frequency
- hyperhigh frequency
- idler frequency
- image frequency
- imaginery frequency
- IMPATT-frequency
- impingement frequency
- impulse frequency
- infralow frequency
- infrasonic frequency
- instantaneous frequency
- intercarrier frequency
- intermediate frequency
- intermodulation component frequency
- intermodulation frequency
- inversion-layer cutoff frequency
- ion cyclotron frequency
- ion plasma frequency
- ionization frequency
- jittered pulse-recurrence frequency
- Josephson frequency
- keying frequency
- knee frequency
- Langmuir plasma frequency
- Larmor frequency
- laser-emission-frequency
- laser-frequency
- lattice vibration frequency
- line frequency
- line screen frequency
- lobe frequency
- local-oscillator frequency
- locking frequency
- low frequency
- lower side frequency
- lowest observed frequency
- lowest useful frequency
- lowest useful high frequency
- magnetohydrodynamic frequency
- magnetoplasma frequency
- mains frequency
- maser frequency
- maser-emission frequency
- master frequency
- maximum frequency of oscillation
- maximum keying frequency
- maximum modulating frequency
- maximum observed frequency
- maximum usable frequency
- medium frequency
- microwave frequency
- midband frequency
- mode frequency
- modulation frequency
- multiple frequency
- natural frequency
- nominal frequency
- notch frequency
- note frequency
- Nyquist frequency
- observed frequency
- operating frequency
- optical frequency
- optimum working frequency
- penetration frequency
- photoelectric threshold frequency
- picture frequency
- piezoelectric crystal antiresonant frequency
- piezoelectric crystal resonant frequency
- pilot frequency
- plasma frequency
- power frequency
- power-line frequency
- precession frequency
- primary frequency
- pulse-recurrence frequency
- pulse-repetition frequency
- pump frequency
- pumping frequency
- quasi-optical frequency
- quench frequency
- quenching frequency
- quiescent frequency
- radian frequency
- radio frequency
- rated frequency
- reactive cutoff frequency
- real frequency
- reference frequency
- relative frequency
- repetition frequency
- resistive cutoff frequency
- resonance frequency
- resonant frequency
- rest frequency
- resting frequency
- ringing frequency
- ripple frequency
- scan frequency
- scanning-line frequency
- screen frequency
- secondary frequency
- second-channel frequency
- self-neutralization frequency
- self-resonant frequency
- SH frequency
- side frequency
- sonic frequency
- sound carrier frequency
- sound center frequency
- sound frequency
- space frequency
- spark frequency
- spatial frequency
- speech frequency
- spike frequency
- spin frequency
- spot frequency
- standard frequency
- Stokes frequency
- subaudio frequency
- subcarrier frequency
- subharmonic frequency
- sub-Nyquist frequency
- subsonic frequency
- sub-telephone frequency
- sum frequency
- summation frequency
- superaudio frequency
- superhigh frequency
- supersonic frequency
- super-telephone frequency
- supply frequency
- suppression frequency
- sweep frequency
- synchronizing frequency
- threshold frequency
- timed radio frequency
- timing frequency
- toggle frequency
- tone frequency
- top baseband frequency
- transition frequency
- transit-time cutoff frequency
- transit-time frequency
- transmission frequency
- TRAPATT frequency
- trapped plasma frequency
- treble frequency
- turnover frequency
- ultra-audible frequency
- ultrahigh frequency
- ultrasonic frequency
- unassigned frequency
- undamped frequency
- uniform precession frequency
- unity-gain frequency
- up-link frequency
- upper side frequency
- variable frequency
- vertical frequency
- very high frequency
- very low frequency
- video frequency
- vision carrier frequency
- vision frequency
- visual carrier frequency
- voice frequency
- voltage gain cutoff frequency
- waveguide cutoff frequency
- window frequency
- wow frequency