dual-frequency

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• Dual-tone multi-frequency signaling — One of the few production telephone DTMF keypads with all 16 keys, from an Autovon Telephone. The column of red keys produces the A, B, C, and D DTMF events. Dual tone multi frequency signaling (DTMF) is used for telecommunication signaling over… …   Wikipedia

• Dual inheritance theory — (DIT), also known as gene culture coevolution, was developed in the late 1970s and early 1980s to explain how human behavior is a product of two different and interacting evolutionary processes: genetic evolution and cultural evolution. DIT is a… …   Wikipedia

• Dual-tone multi-frequency — (DTMF) signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone tone dialing is known by the trademarked term Touch Tone (canceled March 13, 1984),… …   Wikipedia

• Dual-Cell HSDPA — (also known as: Dual Carrier HSPA or Dual Cell HSPA) is a wireless broadband standard based on HSPA that is defined in 3GPP UMTS release 8. Dual Cell (DC )HSDPA is the natural evolution of HSPA by means of carrier aggregation in the downlink[1].… …   Wikipedia

• Dual impedance — and dual network are terms used in electronic network analysis. The dual of an impedance is its algebraic inverse . Note that and are the duals of each other, that is, they are reciprocal. For this reason the dual impedance is also called the… …   Wikipedia

• Dual-modulus prescaler — A dual modulus prescaler is an electronic circuit used in high frequency synthesizer designs to overcome the problem of generating narrowly spaced frequencies that are nevertheless too high to be passed directly through the feedback loop of the… …   Wikipedia

• Dual-band blade antenna — Contents 1 Introduction 2 Theory 2.1 Monopoles 2.1.1 Blade Antennas 2.2 Slot Antennas …   Wikipedia

• Dual band — In mobile phones, dual band (also known as dual band or dualband ) refers to functionality that allows a cellphone to support two frequency bands. Having more than one frequency in one device is useful to enable roaming between different… …   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

• Frequency divider — A frequency divider, also called a clock divider or scaler or prescaler, is a circuit that takes an input signal of a frequency, fin, and generates an output signal of a frequency: where n is an integer. Phase locked loop frequency synthesizers… …   Wikipedia

• Frequency-shift keying — Passband modulation v · d · e Analog modulation AM · …   Wikipedia