Apparatus and method for echo cancellation

Details Apparatus and method for echo cancellation Apparatus and method for echo cancellation

1997-06-16

1999-10-19

Lee, Ping

Electrical audio signal processing systems and devices

Dereverberators

381 93, 379410, 379390, H04B 320

Patent

active

059701544

ABSTRACT:
Apparatus and method for echo cancellation that incorporate a psychoacoustic model in determining the necessity to update compensator coefficients for the generation of artificial echoes for echo cancellation. The method includes the steps of dividing an audio signal having at least one echo into a plurality of subbands. For each of the plurality of subbands, the echo is reduced based on a variable coefficient transfer function to produce a compensated subband. The signal level of the compensated subband is then compared to a threshold value on a psychoacoustic model curve at a corresponding subband frequency. If the signal level of the compensated subband is greater than the threshold value, the coefficients of the transfer function are updated. Conversely, if the signal level of the compensated subband is less than or equal to the threshold value, the coefficients of the transfer function are not updated.

REFERENCES:
patent: 5272695 (1993-12-01), Makino et al.
patent: 5400399 (1995-03-01), Umemoto et al.
patent: 5473686 (1995-12-01), Virdee
patent: 5477534 (1995-12-01), Kusano
patent: 5548642 (1996-08-01), Diethorn
patent: 5577116 (1996-11-01), Townsend et al.
patent: 5721730 (1998-02-01), Genter
"Psychoacoustic Model 1 for Lower Sampling Frequencies", SO/IEC DIS 13818-3, Annex D, pp. 87-92.

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