Sound reproducing apparatus

Details Sound reproducing apparatus Sound reproducing apparatus

1989-09-21

1990-11-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Including phase control

381 98, 381103, 381 86, 333 28T, H03G 500

Patent

active

049724894

ABSTRACT:
A sound reproduction system suitable for automobile, the reproduction system having a band-pass filter, a phase-shifter for shifting the output of the band-pass filter and a mixer which mixes the output of the phase-shifter with the original audio signal at a suitable mixing ratio, whereby a low frequency standing wave which is generally produced in the small automobile room may be eliminated, thereby providing a desirable frequency response characteristic.

REFERENCES:
patent: 3980828 (1976-09-01), Orban
patent: 3992582 (1976-11-01), Osakabe
patent: 4329544 (1982-05-01), Yamada
patent: 4472993 (1984-09-01), Futamase et al.
patent: 4594730 (1986-01-01), Rosen
patent: 4612530 (1986-09-01), Kurth et al.
patent: 4622691 (1986-11-01), Tokumo et al.

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