Testable echo cancelling method and device

Details Testable echo cancelling method and device Testable echo cancelling method and device

1990-04-17

1991-04-16

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of hybrid or echo suppressor or canceller

379407, 370 131, H04M 124, H04M 908

Patent

active

050089234

ABSTRACT:
A communications system adaptive echo canceller integrally contains a test far-end talker signal generator, an echo signal generator for generating an echo signal with a simulated echo path, a residual echo detector for detecting a residual echo based on the output of a subtracter, and a switching unit for switching an input and output signal of the echo canceller into an echo canceller test mode. Further, it provides a bypassing unit for, in a test mode, separating a call/talk connected to the echo cancellers from the echo cancellers and forming a bypass path between trunk circuits and a transmission circuit. The bypassing unit results in being able to realize a test for the echo canceller while a talk is alive.

REFERENCES:
patent: 3637954 (1972-01-01), Anderson et al.
patent: 4101743 (1978-07-01), Costes et al.
D. L. Duttweiler et al., "A Single Chip VLSI Echo Canceler", The Bell System Technical Journal, vol. 59, Feb. 1980, pp. 149-160.
CCITT Recommendation G. 165, 1984, pp. 258-279.

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