Adaptive digital filter

Details Adaptive digital filter Adaptive digital filter

1997-06-10

1999-04-13

Pham, Chi H.

Pulse or digital communications

Equalizers

Automatic

375235, 36472419, H23H 730, H23H 740

Patent

active

058944958

ABSTRACT:
This invention relates to adaptive digital filters for echo cancellation in a bi-directional data transmission channel. Substantial hardware savings for a digital adaptive filter are possible, if hardware structures for performing filter operations are shared. In a digital adaptive filter with resource sharing filter operations are performed sequentially with a limited number of hardware structures. This invention discloses a digital adaptive filter with resource sharing with further hardware savings (FIG. 3). Corresponding to a characteristic decrease of the magnitude of the filter coefficients for echo cancellation, a first and second filter computation means (4.sub.A, 4.sub.B) are connected to a coefficient storage means (3) with a different bit width to receive coefficients (c.sub.0, c.sub.1 . . . c.sub.N/2-2, c.sub.N/2-1 ; c.sub.N/2, c.sub.N/2+1 . . . c.sub.N-2, c.sub.N-1) having different magnitudes and/or a first and second coefficient adapting means (7.sub.A, 7.sub.B) are connected to the coefficient storage means (3) with a different bit width to receive coefficients (c.sub.0, c.sub.1 . . . c.sub.N/2-2, c.sub.N/2-1 ; c.sub.N/2, c.sub.N/2+1 . . . c.sub.N-2, c.sub.N-1) having different magnitudes, allowing a hardware reduction the and reduction of the size of the filter device.

REFERENCES:
patent: 4037160 (1977-07-01), Miloradovic et al.
patent: 4483009 (1984-11-01), Honda et al.
patent: 5315621 (1994-05-01), Gonzulo
patent: 5513223 (1996-04-01), Shoji
patent: 5524125 (1996-06-01), Tsujimoto
patent: 5537443 (1996-07-01), Yoshino et al.
patent: 5594677 (1997-01-01), Golla et al.
patent: 5636153 (1997-06-01), Ikegaya et al.

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