Sound system

Electrical audio signal processing systems and devices – Binaural and stereophonic

Reexamination Certificate

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Details

C381S018000, C381S097000, C381S098000, C381S102000

Reexamination Certificate

active

07123724

ABSTRACT:
The invention is directed to a sound system with four loudspeakers and at least one signal processing device connected to the input of two loudspeakers and controlled by two input signals. The signal processing device produces control signals for the loudspeakers. The respective control signals are equal to the sum of the input signals which are weighted differently with respect to amplitude and phase, so that the radiation characteristic of the two loudspeakers depends on the weighting of the input signals.

REFERENCES:
patent: 3757046 (1973-09-01), Williams
patent: 5109415 (1992-04-01), Ishida
patent: 5305386 (1994-04-01), Yamato
patent: 5325435 (1994-06-01), Date et al.
patent: 5657391 (1997-08-01), Jyosako
patent: 5793876 (1998-08-01), Derogis et al.
patent: 5889867 (1999-03-01), Bauck
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patent: 04-337 999 (1992-11-01), None
patent: 06-315 198 (1994-11-01), None
patent: 07-046 698 (1995-02-01), None
patent: WO 97 30 566 (1997-08-01), None
patent: WO 98/54926 (1998-12-01), None
Patent Abstracts of Japan, JP H01-151399 A, Jun. 14, 1989.
Patent Abstracts of Japan, JP H06-315198 A, Nov. 8, 1994.
Patent Abstracts of Japan, JP S55-085200 A, Jun. 26, 1980.

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