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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]
Michael J. Birck (January 25, 1938 – July 6, 2015) was a co-founder and chairman of Tellabs Inc. He began his career at Bell Telephone Laboratories, and helped found Tellabs in 1975. He served as the CEO of the company from 2002 to 2004.
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