Invention Grant
- Patent Title: Audio signal output control device that suppresses pop sound
- Patent Title (中): 抑制流行声音的音频信号输出控制装置
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Application No.: US11593650Application Date: 2006-11-07
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Publication No.: US07957544B2Publication Date: 2011-06-07
- Inventor: Kazuki Adachi , Tetsuro Sugioka , Kiyomi Kimura
- Applicant: Kazuki Adachi , Tetsuro Sugioka , Kiyomi Kimura
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: McDermott Will & Emery LLP
- Priority: JP2005-321977 20051107; JP2006-289099 20061024
- Main IPC: H04B15/00
- IPC: H04B15/00
Abstract:
The potential of a smoothing capacitor for a speaker is smoothly changed by controlling the potential with use of a PWM signal and switching between outputting the PWM signal and an actual audio signal, thereby suppressing a pop sound. The scale of circuitry is reduced and cost is lowered by implementing a PWM circuit in a one-chip microcontroller. Noise is eliminated by outputting a pulse that has been divided in the PWM signal generation stage.
Public/Granted literature
- US20070121962A1 Audio signal output control device that suppresses pop sound Public/Granted day:2007-05-31
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