Idle code density detector

Details Idle code density detector Idle code density detector

1997-06-19

2000-08-29

Pham, Chi H.

Multiplex communications

Duplex

Transmit/receive interaction control

379407, H04B 320, H04M 100

Patent

active

061118621

ABSTRACT:
An echo canceler (10) includes an idle code density detector (12) that measures an idle code density over a period of time. The idle code density detector (12) includes an idle code detector (30) that identifies idle codes and non-idle codes. An idle code integrator (32) increments an idle code count (36) by a first weight factor (38) for each idle code identified by the idle code detector (30). The idle code integrator (32) decrements the idle code count (36) by a second weight factor (40) for each non-idle code identified by the idle code detector (30). A threshold detector (34) continuously compares the idle code count (36) to a threshold value (42). When the idle code count (36) exceeds the threshold value (42), the threshold detector (34) generates a control signal (22) to disable an adaptive filter (14) and a processor (18) of the echo canceler (10).

REFERENCES:
patent: 5235634 (1993-08-01), Oliver
patent: 5361251 (1994-11-01), Aihara et al.

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