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Signal transmission path selection circuit and method, and electronic device employing the circuit

  • US 8,396,509 B2
  • Filed: 10/20/2009
  • Issued: 03/12/2013
  • Est. Priority Date: 11/04/2008
  • Status: Active Grant
First Claim
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1. An electronic device comprising:

  • a central processing unit;

    a USB connector;

    a USB switch interconnecting said central processing unit and said USB connector, and having a data transmission path and an audio signal transmission path for signal transmission between said central processing unit and said USB connector, said USB switch selecting said data transmission path for transmission of data according to a first selection signal from said central processing unit, and selecting said audio signal transmission path for transmission of audio signals according to a second selection signal from said central processing unit; and

    an audio path selector electrically connected to said central processing unit and said USB switch, and having a first audio path for output of audio signals from said central processing unit to said audio signal transmission path of said USB switch, and a second audio path for output of audio signals from said audio signal transmission path of said USB switch to said central processing unit.

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