Echo cancellation and control in discrete cosine transform...

Details Echo cancellation and control in discrete cosine transform... Echo cancellation and control in discrete cosine transform...

2005-09-15

2010-12-21

Tsang, Fan (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406080

Reexamination Certificate

active

07856098

ABSTRACT:
There is provided an echo cancellation method that comprises computing a Discrete Cosine Transform (DCT) domain over a plurality of samples of a first signal to generate a plurality of first DCT samples, selecting one or more first coefficients from the plurality of first DCT samples, computing a DCT domain over a plurality of samples of a second signal to generate a plurality of second DCT samples, selecting one or more second coefficients from the plurality of second DCT samples, wherein the one or more second coefficients are same coefficients as the one or more first coefficients, applying normalized cross correlation to the one or more first coefficients and the one or more second coefficients to generate normalized cross correlation values, cancelling an echo of the second signal from the first signal by determining a bulk delay and a double talk condition based on the normalized cross correlation values.

REFERENCES:
patent: 6154762 (2000-11-01), Malvar
patent: 6249581 (2001-06-01), Kok
patent: 6738480 (2004-05-01), Berthault et al.
patent: 6766019 (2004-07-01), Benesty et al.
patent: 2004/0252652 (2004-12-01), Berestesky et al.

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