Speaker apparatus

Details Speaker apparatus Speaker apparatus

1997-06-10

1999-01-19

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With magnetic loudspeaker

381111, H04R 300

Patent

active

058622373

ABSTRACT:
A speaker device driving drive coils of a speaker such as an electromagnetically coupled speaker by digital sound signals, where a primary coil of the speaker unit is constituted by 15 pieces of coils, the coils are made to correspond to respective bits excluding MSB of a digital sound of 16 bits issued from a serial/parallel converter, each of the coils are connected in a bridge connection to 4 pieces of FETs respectively opposed to each other and constant current sources are connected to the bridge connection portions whereby a coil drive circuit is constituted, currents from the constant current sources are respectively supplied to the coils and a variable resistor is adjusted by which voltages are changed and the currents of the constant current sources are commonly controlled whereby the volume of the speaker is finely driven.

REFERENCES:
patent: 4515997 (1985-05-01), Stinger, Jr.
patent: 4555797 (1985-11-01), Nieuwendijk et al.
patent: 4566120 (1986-01-01), Nieuwendijk et al.
patent: 4612420 (1986-09-01), Nieuwendijk et al.
patent: 5003609 (1991-03-01), Muraoka
patent: 5303371 (1994-04-01), Nakajima
patent: 5347587 (1994-09-01), Takahashi et al.
patent: 5592559 (1997-01-01), Takahashi et al.

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