H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72, 328/0.2
H04B 3/23 (2006.01)
Patent
CA 1257352
ABSTRACT OF THE DISCLOSURE A method and apparatus is disclosed for adjusting a digital equalizing filter in a hybrid circuit in a tele- communication system for transmitting digital information in duplex on a single line pair with simultaneous adaptive echo elimination and adaptive elimination of noise caused by intersymbol interference. A first and a second compensation signal (?(t), ?(t)), which are respectively dependent on the stored parameters of a digital balance filter and the equalizing filter, are subtracted from a received signal (a(t) + e(t) + i(t)) to form a difference signal (r(t)) which is compensated for noise respectively caused by echoes and intersymbol interference. The balance filter parameters are corrected with the aid of a correction signal ( .epsilon.Bk) dependent on the difference signal (r(t)). The equalizing filter parameters are adjusted with the aid of a further correction signal ( .epsilon.Uk) formed by the balance filter cor- rection signal (.epsilon.Bk) and the first compensation signal (ê(t)) such that the further correction signal (.epsilon.Uk) will substantially agree with the balance filter correction signal (.epsilon.Bk), but obtain the value zero when the first compensation signal (ê(t)) and the balance filter correc- tion signal (.epsilon.Bk) are both positive simultaneously or negative simultaneously. The correction sequence of the equalizing filter parameters when the balance filter para- meters are changed in a direction such that the absolute amount of the estimated echo (ê(t)) increases is thus prevented.
507143
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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