Electrical audio signal processing systems and devices – Dereverberators
Patent
1995-01-09
1997-05-27
Kuntz, Curtis
Electrical audio signal processing systems and devices
Dereverberators
381 94, 379410, 379411, 379406, H04B 320
Patent
active
056339364
ABSTRACT:
An acoustic echo canceler (10) includes an adaptive filter circuit (12) and a near-end speech detection circuit (14). The adaptive filter circuit (12) includes an adaptive filter that may be of a single or dual filter structure for generating an e(t) acoustic echo canceler output signal (26) in response to an s(t) far-end speech signal (20) and an x(t) send-in signal (28). The near-end detection circuit (14) receives the s(t) far-end speech signal (20) and the x(t) send-in signal (28) at a high pass filter (32) and a high pass filter (36), respectively. The filtered s(t) far-end speech signal (20) and the filtered x(t) send-in signal (28) are averaged over a selected sampling period by a far-end sampling circuit (34) and a send-in sampling circuit (38). A divider circuit (40) generates a .gamma.(t) acoustic echo path gain/loss signal (42) in response to the filtered and averaged s(t) far-end speech signal (20) and x(t) send-in signal (28). A near-end detector (44) compares the .gamma.(t) acoustic echo path gain/loss signal (42) with a .rho..sub..gamma. long term average signal (46) generated from the .gamma.(t) acoustic echo path gain/loss signal (42) to determine a first condition for near-end speech detection. Near-end detector (44) also compares an e(t) average power signal (51) of the e(t) acoustic echo canceler output signal (26) as generated by a power sampling circuit (50) with its .rho..sub.e long term average signal (53) generated by a long term echo canceler averaging circuit (52) as a second condition.
REFERENCES:
patent: 4979163 (1990-12-01), Erving et al.
patent: 5463618 (1995-10-01), Furukawa et al.
patent: 5473702 (1995-12-01), Yoshida et al.
patent: 5483594 (1996-01-01), Prado et al.
Brady III W. James
Donaldson Richard L.
Hoel Carlton H.
Kuntz Curtis
Nguyen Duc
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