Acoustic drive circuit

Details Acoustic drive circuit Acoustic drive circuit

2007-01-30

2007-01-30

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

With amplifier

C381S111000

Reexamination Certificate

active

10303949

ABSTRACT:
An acoustic drive circuit for driving a headphone for converting variation of magnetic force, occurring to a voice coil, in sound, and outputting the sound, includes a power amplifier for amplifying a signal at a frequency within the speech band, and outputting the signal after amplification, at a voltage with a given bias voltage superposed thereon, to one end of the voice coil of the headphone, and a pulse generation circuit for generating a pulse signal at a frequency higher than those in the speech band, having an average voltage equivalent to the bias voltage, and for outputting the pulse signal to the other end of the voice coil. The pulse generation circuit generates rectangular waves at a frequency higher than those in the speech band, having a duty ratio such that the average voltage is equivalent to the bias voltage.

REFERENCES:
patent: 4360707 (1982-11-01), Joseph et al.
patent: 4968948 (1990-11-01), Tokumo et al.
patent: 8-222976 (1996-08-01), None
patent: 2709984 (1997-10-01), None

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