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Multi-mode bitstream transmission protocol of encoded voice signals with embeded characteristics

  • US 6,961,698 B1
  • Filed: 04/21/2003
  • Issued: 11/01/2005
  • Est. Priority Date: 09/22/1999
  • Status: Expired due to Term
First Claim
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1. A communication system for transmitting a frame of a speech signal, the communication system comprising:

  • a communication medium operable to transmit the frame in the form of a bitstream at a bit rate, the bit rate comprising one of a first bit rate of 8.5 kilobits per second and a second bit rate of 4.0 kilobits per second, the bitstream comprising;

    a type component representative of a type classification of the frame, the type classification comprising a first type and a second type;

    a gain component representing an adaptive codebook gain and a fixed codebook gain jointly encoded as a function of the bit rate when the type classification is the first type;

    the gain component comprising a fixed codebook gain component and an adaptive codebook gain component exclusively encoded as separate components of the bitstream as a function of the bit rate when the type classification is the second type; and

    a mode signal generation module in communication with the communication medium, the mode signal generation module operable to generate a mode signal indicative of a desired average bit rate for the bitstream.

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