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direct frequency modulation

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  • Frequency modulation — See also: Amplitude modulation In telecommunications, frequency modulation (FM) conveys information over a carrier wave by varying its frequency (contrast this with amplitude modulation, in which the amplitude of the carrier is varied while its… …   Wikipedia

  • frequency modulation —    (FM)    The technique of varying the frequency of a carrier wave in direct proportion to the strength of the input signal while maintaining a constant amplitude …   IT glossary of terms, acronyms and abbreviations

  • Direct Metal Mastering — is a vinyl record manufacturing technology by TELDEC. Records manufactured with this technology are often marked by a DMM logo on the outer record sleeve. The cutting lathe for DMM engraves the audio signal directly onto a copper plated master… …   Wikipedia

  • Modulation — For musical change of key, see Modulation (music). For other uses, see Modulation (disambiguation). Passband modulation v · d · e …   Wikipedia

  • Frequency synthesizer — A frequency synthesizer is an electronic system for generating any of a range of frequencies from a single fixed timebase or oscillator. They are found in many modern devices, including radio receivers, mobile telephones, radiotelephones, walkie… …   Wikipedia

  • Direct torque control — (DTC) is one method used in variable frequency drives to control the torque (and thus finally the speed) of three phase AC electric motors. This involves calculating an estimate of the motor s magnetic flux and torque based on the measured… …   Wikipedia

  • Frequency-hopping spread spectrum — (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. A spread spectrum transmission offers three main advantages over… …   Wikipedia

  • Modulation (disambiguation) — Modulation is the process of varying one or more properties of a high frequency periodic waveform. Modulation may also refer to: Modulation (European Union), an authorized reduction in direct aid to producers In science: Immunomodulation therapy… …   Wikipedia

  • Direct-sequence spread spectrum — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • Direct Stream Digital — (DSD) is the trademark name used by Sony and Philips for their system of recreating audible signals which uses pulse density modulation encoding, a technology to store audio signals on digital storage media which is used for the Super Audio CD… …   Wikipedia

  • Frequency comb — A frequency comb is the graphic representation of the spectrum of a mode locked laser. An octave spanning comb can be used for mapping radio frequencies into the optical frequency range or it can be used to steer a piezoelectric mirror within a… …   Wikipedia

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