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Acoustic echo return loss - aerl

Telecommunications Glossary
    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.




Experienced, английский

Loudspeaker, английский
  1. 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

  2. Громкоговоритель; акустическая система


Microphone, английский
  1. Микрофон

  2. 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.

  3. A device that converts sound into an electrical signal. common microphones include cardioid, ribbon, stereo, omnidirectional and condenser.

  4. 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.


Conference, английский
  1. Система обмена сообщениями в компьютерных сетях, дискуссия круга людей по определенной теме

  2. An affiliation of shipowners operating over the same route(s) who agree to charge uniform rates and other terms of carriage. a conference is "closed" if one can enter only by the consent of existing members of the conference. it is "open" if anyone can enter by meeting certain technical and financial standards. conference members are common carriers.

  3. A conversation between three or more people, where the communications technology is unknown or not specified.

  4. A screen showing an active conference call.

  5. A telephone conversation between three or more people.

  6. A toolbar button that provides the user with the service that allows three or more persons to converse together in a phone call.

  7. An association of sports teams that play each other.


Reflective, английский

Correspond, английский
    Соответствовать correspondenceсоответствие


Acoustic echo return loss enhancement - aerle, английский
    The maximum echo cancellation provided by the acoustic canceller. typical figures will vary from 6 to 18 db. the larger the number the better. it is important to note whether the figure is quoted with the center clipper enabled or disabled. if quoted with center clipper disabled, it is a true measure of the cancellation provided by the echo canceller rather than the attenuation provided by the center clipper.


Acoustic echo canceller, английский
    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.