Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate
2005-08-23
2005-08-23
Tran, Sinh (Department: 2644)
Telephonic communications
Echo cancellation or suppression
Using digital signal processing
C379S406010, C379S406020, C379S406050, C379S406060, C379S406090, C379S406100, C379S406110
Reexamination Certificate
active
06934387
ABSTRACT:
A communication transmitting and receiving system in which the effects of near-end echo and near-end crosstalk signal from the communication medium are mitigated by adaptively reproducing the near-end echo and near-end crosstalk signal, which is then subtracted from the received signal. Filter coefficients for a Finite Impulse Response filter are adaptively generated to reproduce the near-end echo and near-end crosstalk. The filter coefficients are regenerated for the Finite Impulse Response filter in an adaptive correlator at the arrival of each received signal and whereby each new filter coefficient is a weighted sum of a previous coefficient and one received signal multiplied by a time delayed version of one transmitted signal.
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Marvell International Ltd.
Singh Ramnandan
Tran Sinh
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