Arrangement for communication with a subscriber

Details Arrangement for communication with a subscriber Arrangement for communication with a subscriber

1995-07-27

1998-07-21

Matar, Ahmad F.

Telephonic communications

Echo cancellation or suppression

379 51, 379 89, 379407, 379410, 704231, H04M 900

Patent

active

057844542

ABSTRACT:
The invention relates to an arrangement for communication with a subscriber. The arrangement includes a spectral analysis unit for producing short-time spectral values (Y(i)) of received signals (E) which signals are at times subscriber's speech signals superimposed by echoes of transmission signals (S) transmitted to the subscriber, a echo cancelling unit for estimating short-time spectral values of the echoes (X.sub.w (i)) and for producing difference values (D(i)) between the short-time spectral values (Y(i)) of the received signals (E) and the estimated short-time spectral values (X.sub.w (i)) of the echoes, and speech recognition unit for evaluating the difference values (D(i)).

REFERENCES:
patent: 4914692 (1990-04-01), Hartwell et al.
patent: 5247512 (1993-09-01), Sugaya
patent: 5263020 (1993-11-01), Yatsuzuka
patent: 5353310 (1994-10-01), Russell et al.
patent: 5463661 (1995-10-01), Moran, III et al.
"Verfahren fur Friesprechen, Spracherkennung und Sprachcodierung in der SPS51", by W. Armbruster et al, PKI Tech. Mitt., Jan. 1990, pp. 35-41.

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