H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/20 (2006.01) H03H 21/00 (2006.01) H04B 3/23 (2006.01)
Patent
CA 2125658
ABSTRACT OF THE DISCLOSURE Apparatus for reducing the risk of undesirable drifting of the parameters, so-called bursting, of an adaptive echo filter, which is coupled between a receiving branch and a transmitting branch included in a four-wire loop. A difference signal which contains no echo from the receiving branch is generated in the transmitting branch in a known manner. The apparatus includes an adaptive filter which is coupled between the transmitting branch and the receiving branch and which functions to generate a compensation signal from the difference signal when transmitting narrowband signals from a near-end. The compensating signal is subtracted from a signal which appears in the receiving branch and the filter is updated in a manner to minimize the correlation between the difference signal and the input signal of the echo filter. A relatively small filter is sufficient to essentially eliminate this correlation when transmitting signals which, at maximum, consist of some few single sinusoidal tones.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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