Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1997-08-08
2000-05-09
Isen, Forester W.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379406, 379411, 708322, H04M 900
Patent
active
060614447
ABSTRACT:
The present invention relates to an echo canceler for training an echo path estimation without providing a hindrance to a speech. The echo canceler of the present invention includes a pseudo noise generator for generating a certain pseudo noise. This pseudo noise is forcibly supplied to a transmission line for transmitting a far-end talker's voice. Here, in the case where the far-end talker's transmitting speech level is faint or the far-end talker is in a speechless condition, a certain correlation is established between the pseudo noise and a signal of the transmission line for transmitting the near-end talker's voice. Based on such a correlation as just mentioned, a coefficient for generating an echo replica is calculated. Therefore, a training for estimating an echo path is performed based on the pseudo noise and without depending on the far-end talker's voice, thereby generating an appropriate echo replica.
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A learning method for System Identification (Jin-Ichi Nagumo), Jun. 1967.
Kawahara Toshiro
Miki Toshio
Ohya Tomoyuki
Isen Forester W.
NTT Mobile Communications Network Inc.
Saint Surin Jacques
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