Digital filter and apparatus for reproducing sound using the dig

Details Digital filter and apparatus for reproducing sound using the dig Digital filter and apparatus for reproducing sound using the dig

1996-09-19

1998-02-10

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

3647242, H04B 110

Patent

active

057177279

ABSTRACT:
A digital filter is composed of an FIR filter with a finite tap length and a feedback section. An apparatus for reproducing sound is arranged to use the digital filter. In the feedback section, an output of one of a plurality of delaying units included in the FIR filter is attenuated through the effect of a coefficient multiplier. The attenuated output is fed back to an adder located between adjacent delaying units arranged before the one delaying unit. The feedback section repeats the feedback operation to generate an infinitely continuing impulse response.

REFERENCES:
patent: 4695969 (1987-09-01), Sollenberger
patent: 5025472 (1991-06-01), Shimizu et al.
patent: 5432856 (1995-07-01), Shioda
patent: 5579396 (1996-11-01), Iida et al.

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