Speaker apparatus and sound reproduction system employing same

Details Speaker apparatus and sound reproduction system employing same Speaker apparatus and sound reproduction system employing same

1997-05-21

2000-12-12

Isen, Forester W.

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

381117, H04R 300

Patent

active

061608947

ABSTRACT:
A speaker apparatus capable of reproducing from low-pitched to high-pitched sounds and a voice reproduction system employing the same. The speaker apparatus includes a speaker unit in which a primary coil is mounted in a gap portion between a plate and a center pole of a magnetic circuit, a secondary coil is disposed within the gap in such a manner as to be fixed to a vibration plate, and a secondary electric current is induced in the secondary coil by a signal current flowing through a primary coil, thereby operating the vibration plate; and a speaker driving circuit adapted to drive the primary coil of the speaker unit in accordance with a digital sound signal.

REFERENCES:
patent: 4145945 (1979-03-01), Iyeta
patent: 4504704 (1985-03-01), Ohyaba et al.
patent: 4566120 (1986-01-01), Nieuwendijk et al.
patent: 4720868 (1988-01-01), Hirano
patent: 5347587 (1994-09-01), Takahashi et al.
patent: 5796843 (1998-08-01), Inanaga et al.
patent: 5862237 (1999-01-01), Kishigami et al.

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