Echo and crosstalk cancellation

Details Echo and crosstalk cancellation Echo and crosstalk cancellation

2006-03-28

2006-03-28

Hsu, Alpus H. (Department: 2665)

Multiplex communications

Crosstalk suppression

C370S290000, C370S292000, C379S406080, C379S406100

Reexamination Certificate

active

07020068

ABSTRACT:
A cancellation system comprises a channel circuit (11) for each noise source, such as echo in a particular cable pair. There are only eighty taps per channel, in two blocks (n_echo_a, f_echo_a). Each block is preceded by a variable delay line comprising blocks of registers cascaded so that a delay value of 0 to 40 clock cycles can be chosen. The delay value is determined by determining an optimum position for each tap block. This is achieved by determining a maximum coefficient sum for a number of windows. Taps from other channels are used during training, so that there is a total of 160 taps for each channel during training to enable the optimum positions to be determined.

REFERENCES:
patent: 5483551 (1996-01-01), Huang et al.
patent: 5675644 (1997-10-01), Sih
patent: 5970088 (1999-10-01), Chen
patent: 6240133 (2001-05-01), Sommer et al.
patent: 6377640 (2002-04-01), Trans

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