H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72
H04B 15/00 (2006.01) H04B 3/23 (2006.01) H04L 25/03 (2006.01) H04L 25/08 (2006.01)
Patent
CA 1181150
ABSTRACT: Arrangement for correcting pulse distortion in homochronous data transmission". In the duplex transmission of data signals over two-wire transmission paths the phenomenon of echo-signals is encountered, while simultaneously intersymbol inter- ference occurs between the data symbols themselves. In order to reduce the influence of both the echo signals and the intersymbol interference, the arrangement comprises a random access memory (16) which produces a correction value(c(i)) at each sampling instant to correct the received data signal. The memory is addressed from registers (13, 14) and a counter (15), the contents of the registers being determined by the data symbols transmitted last and the data symbols received last, respectively. A D-A converter (19) converts the correction value into a correction signal (c(t)), which in a diffe- rence producer (20) is subtracted from the received dats signal A sampling arrangement (21) samples the corrected received data signal. After D-A conversion (22) and multiplication (17) by a predetermined factor .alpha. each sample furnishes a number by which the correction value is changed to match it to the value of the pulse distortion at the sampling instant.
395603
Gerwen Petrus J. Van
Kalfs Johannes J.w.
Snijders Wilfred A.m.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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