Invention Grant
- Patent Title: Audio output device and method
- Patent Title (中): 音频输出装置及方法
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Application No.: US12206868Application Date: 2008-09-09
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Publication No.: US08150064B2Publication Date: 2012-04-03
- Inventor: Toshimi Yamada
- Applicant: Toshimi Yamada
- Applicant Address: JP Tokyo
- Assignee: Oki Semiconductor Co., Ltd.
- Current Assignee: Oki Semiconductor Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Volentine & Whitt, PLLC
- Priority: JP2007-261135 20071004
- Main IPC: H04B15/00
- IPC: H04B15/00

Abstract:
An audio output device and method capable of preventing generation of pop noise by a relatively simple and small-sized circuit configuration and control timing. A D/A converter converts a digital audio signal to an analog audio signal. A non-inverting amplifier amplifies the analog audio signal. A signal output from the non-inverting amplifier is amplified by inverting amplifiers of two stages with a first timing. A signal output from an inverting amplifier is input to a speaker amplifier by a switch. The output signal of the inverting amplifier is output to a speaker with a second timing subsequent to the first timing. The output signal of the inverting amplifier is amplified by the speaker amplifier and output to the speaker. With a third timing subsequent to the second timing, the output of each of the inverting amplifiers is stopped and the output of the speaker amplifier is stopped.
Public/Granted literature
- US20090092264A1 AUDIO OUTPUT DEVICE AND METHOD Public/Granted day:2009-04-09
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