H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72
H04B 15/00 (2006.01) H04B 3/23 (2006.01)
Patent
CA 1211525
Abstract: 21 A method of initializing filter coefficients in an arrangement compri- sing a near echo and a distant echo canceller and an apparatus for carrying out said method. The filter coefficients of an echo cancelling arrangement having a near echo canceller and a distant echo canceller are initialized in accordance with a method which comprises the following steps: transmission of at least two training sequences each comprising a pair of complementary S and C sequences having autocorrelation functions such that, if added, their sidelobes cancel each S and C sequence being followed by a variable time interval .DELTA., determined as a function of the measured distant echo delay ? so that a distant echo produced response to a training sequence occurs immediately after the distant echo produced in response to by a following training sequence; after the first training sequence transmitted, calculation of correlation signals giving the correlation between the received signal and reference signals derived from an S sequence and C sequence respectively during the first half and the second half of a training sequence of a duration T; application of a delay T/2 to the correlation signal formed on the basis of the S sequence; production of a sum signal of said delayed correlation signal and the correlation signal formed on the basis of the C sequence; and on the basis of said sum signal, extraction of the coefficients of the echo cancellers during determined time windows.
446078
Alexis Roger P.j.
Barazeche Bahman
Guidoux Loic B.y.
Philips Commununication D'entreprise
Van Steinburg C.e.
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