Acoustic signal processing apparatus

Details Acoustic signal processing apparatus Acoustic signal processing apparatus

1990-12-28

1993-03-16

Dwyer, James L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 63, 84630, 36472403, A61F 1106, H03G 300, G06F 738

Patent

active

051951401

ABSTRACT:
An acoustic signal processing apparatus comprising infinite impulse response type digital filters and phase control device. The filters receive an acoustic signal. Outputs from the filters are synthesized to generate an output signal. The phase control device controls the phase of the output signals so as to cause limit cycle noise components generated by the filters to cancel each other on synthesizing.

REFERENCES:
patent: 3906199 (1975-09-01), Kieburtz
patent: 4034197 (1977-07-01), Lawrence
patent: 4338581 (1982-07-01), Morgan
patent: 4475229 (1984-10-01), Frese
patent: 4586417 (1986-05-01), Kato
patent: 4731835 (1988-03-01), Futamase et al.
patent: 4868878 (1989-09-01), Kunugi

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