Arrangement for cancelling echo signals

Details Arrangement for cancelling echo signals Arrangement for cancelling echo signals

1982-05-03

1984-11-06

Rubinson, Gene Z.

1791706, H04B 320

Patent

active

044813856

ABSTRACT:
Arrangement for cancelling echo signals in data transmission over a two-wire transmission path. The data signals occurring in the send path are applied to an adjustable signal processing arrangement. From said data signals a synthetic echo signal (e(t)) is derived which is subtracted in a difference producer from the data signal occurring in the receive path. The residual signal (r(t)) is converted into a digital residual signal (r(j)) in an analog-to-digital converter arrangement. An interpolator which increases the sampling rate by a factor L results in the production of a digital control signal (r(i)) from the digital residual signal, for the setting arrangement. The sampling rate of the digital residual signal is M/LT Hz, wherein T is the duration of a data symbol in sec. and M and L represent integers which are relatively prime, L being greater than one.

REFERENCES:
patent: 4334128 (1982-06-01), Snijders
patent: 4362909 (1982-12-01), Snijders et al.
patent: 4411006 (1983-10-01), Horna
D. Fallower, "Adaptive Reference Echo Cancellation", IEEE Trans. on Communications, vol. COM-30, No. 9, Sep. 1982, pp. 2083-2094.

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