H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72
H04B 15/00 (2006.01) H04B 3/23 (2006.01) H04L 5/14 (2006.01)
Patent
CA 1152594
1 P~T.9379 ABSTR~CT~ Bcho canceller for use in a homschronou~ data transmission system, comprising two wire and ~our-wire con- nection~ and arranged ~or suppressi~g echo signals occurring in the -Eour-wire connection. This echo canceller comprises an adjustable signal proce~ing arrangement to which the data ~ignal to be transmitted is applied ana which produces a synthetic echo signal. A ~ignal formed by a received data 3ignal and an echo signal is present in the receive path o~ the four-wire connection. To generate a residual signal, th~ synthetic echo signal is subtraated from the signal3 in the receive path. For th~ adjustment of the signal processing arrangement there is added to thl~ residual ~ignal, outsidQ the rece~ve path of the four-wire connection, an auxiliary signal wh~ch is not correlated to thi~ residual signal. The sum signal thus obtained is sampled with a sultably chosen sampling rate which is harmonically related to the symbol rate. The gignal samples obtained are applied to a limitex clrcuit which converts each signal sample into a pQSitiVe or a negative pulse, which i~ indicative of the polarity o~ t~e signal sample. The pulses thus obtained are applied as the control signal to an adjusting dev~ce or adjusting the sig- nal processing arrangement.
347104
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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