Amplifying circuit, speaker system, and mobile information...

Details Amplifying circuit, speaker system, and mobile information... Amplifying circuit, speaker system, and mobile information...

2006-12-05

2006-12-05

Vo, Nguyen T. (Department: 2618)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C381S120000, C330S297000

Reexamination Certificate

active

07146194

ABSTRACT:
An amplifying circuit includes a battery power source, a regulator that regulates an output of the battery power source and generates a reference voltage, and a signal ground generating device that generates and outputs a signal ground by changing the reference voltage in accordance with deterioration detected from the battery power source. An operational amplifier is provided to amplify and output a signal having prescribed waveform to be input to a speaker. The operational amplifier uses a battery power source as a driving power source of its own. The signal ground is positioned at a center of vibration amplitude of the waveform.

REFERENCES:
patent: 6643527 (2003-11-01), Satoh et al.
patent: 6696877 (2004-02-01), Maejima et al.
patent: 6757526 (2004-06-01), Sharp et al.
patent: 6801894 (2004-10-01), Nakamura et al.
patent: 6954537 (2005-10-01), Ng et al.

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