Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2007-10-09
2007-10-09
Pezzlo, John (Department: 2616)
Multiplex communications
Duplex
Transmit/receive interaction control
C375S350000
Reexamination Certificate
active
10064238
ABSTRACT:
The present invention provides a method for hardware reduction in the echo canceller and the near-end crosstalk canceller. The method applies an N (N is a positive integer) times divide frequency sampling operation onto the input data list of the echo canceller first (and the near-end crosstalk canceller). Then, it applies an N times multiply frequency sampling operation onto the output data list of the echo canceller (and the near-end crosstalk canceller) to generate a multiplied frequency data list. Afterwards, a low pass filter operation is applied to the multiplied frequency data list to generate a low pass data list to eliminate the echo signal (and the near-end crosstalk signal). The present invention reduces the number of the taps in the echo canceller and the near-end crosstalk canceller by using the digital signal process technique. Therefore, the area of the whole communication IC occupied by the echo canceller and the near-end crosstalk canceller can be reduced.
REFERENCES:
patent: 4481385 (1984-11-01), Kalfs
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 6396872 (2002-05-01), Sugiyama
patent: 6421377 (2002-07-01), Langberg et al.
patent: 6757385 (2004-06-01), Ehrenstråle et al.
patent: 6853626 (2005-02-01), Farhang-Boroujeny et al.
Jianq Chyun IP Office
Pezzlo John
Topic Semiconductor Corp.
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