发明名称 |
Amplifying circuit, speaker system, and mobile information terminal employing amplifying circuit |
摘要 |
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.
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申请公布号 |
US2004116162(A1) |
申请公布日期 |
2004.06.17 |
申请号 |
US20030673473 |
申请日期 |
2003.09.30 |
申请人 |
MATSUSHIMA MAKOTO;MANABE KATSUHIKO |
发明人 |
MATSUSHIMA MAKOTO;MANABE KATSUHIKO |
分类号 |
H03F3/45;H03F1/30;H03F1/32;H03F3/20;H03G3/00;H04M1/60;H04M1/73;(IPC1-7):H04M1/00;H04B1/38 |
主分类号 |
H03F3/45 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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