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In September 1981, Tellabs introduced the industry's first echo canceller, an advance over the original echo suppressors that synthesized an echo and electronically subtracted it. By 1990, Tellabs had grown to 2,000 employees at 25 locations globally and sales of $211 million.
The performance of an echo canceller is measured in echo return loss enhancement (ERLE), [3] [9] which is the amount of additional signal loss applied by the echo canceller. Most echo cancellers are able to apply 18 to 35 dB ERLE. The total signal loss of the echo (ACOM) is the sum of the ERL and ERLE. [9] [10]
Adaptive feedback cancellation originated during the evolution of the hearing aid. The hearing aid became digital, and as such feedback cancellation was needed. In 1980 a directional microphone was introduced in the digital hearing aid, and adaptive feedback cancellation was created to block external noise that the microphone picked up. Today ...
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This page was last edited on 4 April 2014, at 16:49 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
The adaptive filter approach works by modeling the transfer function of the sound reinforcement system and subtracts the reinforced sound from the inputs to the system in the same way that an echo canceller removes echoes from a communications system.
Man Mohan Sondhi (18 December 1933 – 4 February 2018) was a prominent researcher in speech processing and signal processing who worked at Bell Laboratories during 1962–2001.