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  • Echo cancellation — The term echo cancellation is used in telephony to describe the process of removing echo from a voice communication in order to improve voice quality on a telephone call. In addition to improving subjective quality, this process increases the… …   Wikipedia

  • Echo FM — Infobox Radio Station name = Echo FM airdate = 2006, in Western Springs frequency = 88.1 area = Western Springs, Auckland format = All Genres owner = Sameo Productions erp = 1 Watt slogan = Live and Local website = http://www.echofm.co.nr/|Echo… …   Wikipedia

  • Echo (phenomenon) — In audio signal processing and acoustics, an echo (plural echoes) is a reflection of sound, arriving at the listener some time after the direct sound. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls… …   Wikipedia

  • 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

  • Echo of Moscow — Infobox Radio Station name = Echo of Moscow area = RUS flagicon|USA Chicago flagicon|Kyrgyzstan Bishkek airdate = 22 August, 1990 share = share as of = share source = frequency = format = owner = Gazprom Media website = [http://www.echo.msk.ru… …   Wikipedia

  • echo — i. In radar, a wave reflected from one or more points and returned with a magnitude and a time interval sufficient to be perceived and interpreted. It is observed on the radar indicator. See blip. ii. The pulse of reflected RF (radio frequency)… …   Aviation dictionary

  • High Frequency Active Auroral Research Program — HAARP is often confused with Project HARP, the High Altitude Research Project (a joint project of The Pentagon and the Canadian Department of National Defence).The High Frequency Active Auroral Research Program (HAARP) is an investigation project …   Wikipedia

  • Pre-echo — is an audio compression artifact where a sound is heard before it occurs (hence the name). It is most noticeable in impulsive sounds from percussion instruments such as castanets or cymbals.It occurs in audio compression algorithms which use… …   Wikipedia

  • spin echo — n a signal that is detected in a nuclear magnetic resonance spectrometer, that is an echo like replication of a free induction decay produced by a planned series of radio frequency pulses, and that can be used to extract more information from a… …   Medical dictionary

  • Orthogonal frequency-division multiplexing — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • gradient echo — n a signal that is detected in a nuclear magnetic resonance spectrometer that is analogous to a spin echo but is produced by varying the external magnetic field following application of a single radio frequency pulse rather than by application of …   Medical dictionary

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