H - Electricity – 04 – B
Patent
H - Electricity
04
B
328/0.3
H04B 3/23 (2006.01)
Patent
CA 1205876
ABSTRACT OF THE DISCLOSURE An FIR-type balance filter for preventing, in adaptive echo cancellation in a telecommunication system in which digital information transferred in duplex over a single conductor pair, the local data transmitter from disturbing the local data recep- tion. The filter is thereby arranged so that the total number of links in the filter is divided into at least a first group and a second group. The apparatus contains a memory addressable from the filter links in the first group. There are written into and read from said memory the correction values from and to a cor- rection unit, sending signals for correcting the filter parameters. The memory also sends signals to a summing circuit, to which are also supplied the output signals from the second group of filter links. The output signals may be originated by table look-up in a further memory, or by vector multiplication. A second correc- tion unit corrects the filter parameters in the second group. The output signal from the summing circuit is digital-analogue converted and with its sign added to the signal coming from the remote end and transmitted to the local transmitter, thus compensating for the nonlinearity in the echo signal.
414386
Carlqvist Bengt
Svensson Tommy
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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