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Circuits and methods for implementing audio Codecs and systems using the same

  • US 6,259,957 B1
  • Filed: 04/04/1997
  • Issued: 07/10/2001
  • Est. Priority Date: 04/04/1997
  • Status: Expired due to Term
First Claim
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1. An audio codec having multiple selectable processing paths comprising:

  • a first processing path comprising;

    an analog input mixer for mixing analog data streams received at a plurality of analog inputs into an mixed analog data stream;

    an analog to digital converter for converting said mixed analog data stream into a digital data stream;

    a digital mixer for mixing data from a digital input with said digital data stream to produce a mixed digital data stream;

    a digital to analog converter for converting said mixed digital data stream into a second analog stream;

    an analog output mixer for mixing said second analog stream with analog data received from a second analog input, to produce an analog output stream; and

    at least one output for transmitting said analog output stream to an external device; and

    a second processing path comprising;

    an multiplexer for selecting a data stream from among said analog data streams received at said plurality of analog inputs and said analog output stream;

    an analog to digital converter for converting said data stream selected by said multiplexer into digital form; and

    an output port for transmitting said selected data stream in digital form to an external device.

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