Half-duplex echo canceler training using a pilot signal

Details Half-duplex echo canceler training using a pilot signal Half-duplex echo canceler training using a pilot signal

1995-09-29

1998-10-27

Olms, Douglas W.

Multiplex communications

Duplex

Transmit/receive interaction control

370269, 370290, 370292, 375222, 375231, 375350, 379410, H04J 1500

Patent

active

058286578

ABSTRACT:
A far-end modem transmits a "pilot tone" during the time that a near-end modem is training its echo canceler. Correspondingly, the near-end modem is modified to notch, or filter, out this pilot tone from the received signal. The filtered received signal is then used by the near-end modem to train its echo canceler.

REFERENCES:
patent: 4766589 (1988-08-01), Fisher
patent: 4792940 (1988-12-01), Hiraguchi
patent: 4912758 (1990-03-01), Arbel
patent: 5507033 (1996-04-01), Dolan
patent: 5533048 (1996-07-01), Dolan

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