H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/15, 325/54
H04B 15/00 (2006.01) H04B 3/23 (2006.01)
Patent
CA 1169492
PHF 80503 39 ABSTRACT: Echo canceler associated with a modem utilizing amplitude and phase modulation of a carrier, the echo canceler comprising adaptive filters producing signals which are combined in an adder for forming a synthetic echo signal ? n). The coefficients of these filters are adjusted to minimize the mean square value of the resid- ual echo signal e(n) = .epsilon. (n) - ? (n), where .epsilon. (n) is the echo received. The echo canceler comprises a code con- version circuit which receives a signal D(n) character- izing in each modulation interval the amplitude and phase state of the carrier to be transmitted and which produces distinct configurations of several numbers of values +1, -1 or 0, said distinct configurations corresponding to the distinct possible states of the carrier to be trans- mitted such that elementary signals D1(n) to Dp(n) are formed which are mutually independent in the mean and which are applied to the filters, These filters can then be realized in a simple way.
369600
Philips Commununication D'entreprise
Van Steinburg C.e.
LandOfFree
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