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Acoustic echo canceller
Telecommunications Glossary |
All speakerphones have some form of adaptive echo canceller that produces a synthetic replica of the potential echo to subtract from the transmit audio. most units have a center clipping echo suppresser to remove the residual echo from the transmit signal. the goal of the acoustic echo canceller is to reduce the amount of direct and reverberant loudspeaker coupling to the microphone to prevent echo. to achieve this, the algorithms used in today`s devices require an audio system that is feedback stable.
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Loudspeaker, английский
- An electroacoustic device, used to radiate acoustic power in air, the acoustic waveform of the reproduced sound being essentially equivalent to that of the electrical input. louis xiv, louis quatorze style the
- Громкоговоритель; акустическая система
Microphone, английский
- Микрофон
- A device which converts sound waves into essentially equivalent electric waves; the sound waves move an element in the device which generates an electric voltage.
- A device that converts sound into an electrical signal. common microphones include cardioid, ribbon, stereo, omnidirectional and condenser.
- A device that converts sound waves into analog electrical signals. additional hardware can convert the microphone’s output into digital data that a computer can process; for example, to record multimedia documents or analyze the sound signal.
Algorithms, английский
Complex mathematical formulae or rules used to solve complex problems in cctv they are used to achieve digital compression of a video picture.
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Acoustic echo return loss - aerl, английский
The minimum loss experienced by a sound in traveling from the loudspeaker to the microphone in a conference room. it is expressed in db or decibels. a 0 db loss corresponds to a perfectly reflective room or to very close coupling between loudspeaker and microphone. in practice, aerl figures can range from 0 to -30 db, with a poor room having the former figure.
Acoustic coupler, английский
- A device that allows a conventional telephone handset to feed its signal into a modem, as opposed to direct couplers, which feed the modulated/demodulated signal directly into the phone line.
- Акустический адаптер; акустический модем; акустический соединитель; устройство сопряжения на базе акустического модема
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