Long-haul path length delay estimator and compensator for an...

Details Long-haul path length delay estimator and compensator for an... Long-haul path length delay estimator and compensator for an...

2005-08-02

2005-08-02

Mei, Xu (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S406020, C379S406060, C379S406010, C379S406090

Reexamination Certificate

active

06925175

ABSTRACT:
Apparatus and accompanying methods for use in a long-haul echo control device to automatically measure sufficient changes in path length and compensate a long-haul echo canceller for resulting variations in echo occurring over a path. The apparatus measures a round-trip path delay interval of, e.g., a predefined signaling tone(s) sent between international switching centers while establishing an outbound call connection over the path. Once the delay is measured, the apparatus sets echo delay of a corresponding long-haul echo canceller to accommodate that delay. For a multi-channel facility (e.g., T1 or E1), path delay is separately measured for each channel on that facility, and then the apparatus changes the echo delay to the same amount for the corresponding echo canceller associated with each and every channel on that facility.

REFERENCES:
patent: 4587382 (1986-05-01), Yang
patent: 5473686 (1995-12-01), Virdee
patent: 6243462 (2001-06-01), Chujo et al.
patent: 2002/0131583 (2002-09-01), Lu

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