Echo Cancellation is an attempt to cancel the delays associated with digital networks. Delays are encountered as signals are processed through various routes within the networks, including copper wire, fiber optic lines, microwave connections, international gateways and satellite transmissions.
A technique used with voice circuits to isolate and filter unwanted signal energy which accompanies analog transmissions.
Technology for suppressing (filtering) echo feedback during voice transmission. This significantly improves the transmitted voice quality.
is used in speakerphones and videoconferencing to eliminate echoes caused by microphones capturing sounds produced by corresponding microphones. Echo cancellation works by "remembering" what signal has been put through the speaker, and then subtracting it, appropriately attenuated and delayed, from the signal entering the microphone. The difficulty is in attenuating and delaying the correct amount. Echo cancellation requires much computation, and likely adds cost for processor capability to perform the cancellation algorithms.
A mathematical process that predicts an echo and removes that portion of the signal from an audio waveform to eliminate acoustical echo.
The CODEC delays the vision signal by approximately 200 milliseconds. To maintain sound/vision coincidence the audio signals are delayed by a similar amount. This time delay produces unacceptable echo into the conference. Echo cancellation is introduced electronically to reduce this echo to a workable level. The conference environment influences the amount of echo, so echo cancellers are set up within the conference room in use.
A technique used in high-speed modems to isolate and remove unwanted signal energy created by echoes of the transmitted signal. (An echo is the return of a transmitted signal). It would be noticeable by its absence on transatlantic or other time-differentiated phone conversations.
Removes audio echoes caused by incoming audio being picked up by microphones.
The process of eliminating the acoustic echo in a videoconferencing room.
Removal of echo from an echo-carrying signal.
A DSP technique that filters unwanted signals caused by echoes from themain audio source.
Elimination of reflected signals (“echoes”) in a two-way transmission created by some types of telephone equipment used in data transmission to improve the bandwidth of the line.
Process by which a transmitter/receiver cancels out the transmitted signal as to "hear" the received signal better.
A technique that allows for the isolation and filtering of unwanted signals caused by echoes from the main transmitted signal.
Echo cancellation is used by higher-speed modems to allow for the isolation and filtering out of unwanted signal energy in the receive path caused by echoes from the transmitted signal.
This nifty feature works a little like noise-cancellation. Instead of canceling out ambient noise, it cancels out your own talking that youll hear back from the data stream between you and your caller. The reason why youd hear your voice back in the first place has to do with how telephone calls are transmitted in the first place.
A technique used in high speed modems and voice ciruits to isolate and filter out unwanted signal energy caused by echoes from the main transmitted signal.
A process that uses a mathematical process to "guess" at an echo and remove that portion of the signal from an audio waveform so as to eliminate acoustical echo.
A process that allows full-duplex transmission to occur over a single electrical path. It relies on frequency splitting to derive separate voice and data channels from one wire. This feature is necessary for voice transmission but often interferes with data transmission.
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 capacity achieved through silence suppression by preventing echo from traveling across a network.