H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/23 (2006.01) H04M 3/18 (2006.01) H04M 9/08 (2006.01)
Patent
CA 2286963
Undesired electric coupling between the transmitting path and the receiving path of a telecommunications system and acoustic coupling between the loudspeaker and the microphone in a telecommunications terminal give rise to echos which are to be eliminated by echo suppressors. To be able to adapt these echo suppressors to instantaneous transmission functions, it is necessary to determine a coupling factor and the echo delay time. An essential problem here consists in differentiating between echo and mixed signals produced by so-called double talk. In accordance with the invention, from the characteristic curve of the speech signal there are derived pulse sequences which are dependent upon the frequency but not the amplitude of the speech signal, so that in the case of a real echo, independently of the attenuation, identical pulse sequences occur in the case of the transmitted signal and, with a time shift, in the case of a received echo. The correspondence between the pulse sequences of transmitted signal and received signal is an indication that the received signal is an echo of the transmitted signal.
Alcatel
Robic
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