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Scalable and embedded codec for speech and audio signals

  • US 9,047,865 B2
  • Filed: 08/10/2007
  • Issued: 06/02/2015
  • Est. Priority Date: 09/23/1998
  • Status: Expired due to Fees
First Claim
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1. A system for processing audio signals comprising:

  • a scalable embedded audio-speech encoder comprising;

    (a) a audio-speech frame extractor for dividing a low bit rate, input audio signal into a plurality of signal frames corresponding to successive time intervals;

    (b) a audio-speech frame mode classifier for determining if the low bit-rate signal in a frame is in a steady-state mode or a transition state mode;

    (c) a audio-speech processor for extracting parameters of the low-bit rate signal in a frame, received from said frame mode classifier, wherein said extracted parameters include supplemental phase information for transition state mode frames; and

    (d) a multi-mode audio-speech coder for processing extracted parameters of frames of the low bit-rate signal in at least two distinct paths, a first path processing a first set of extracted parameters using a first bit allocation when a signal in a frame is determined to be in said steady-state mode, and a second path processing a second set of extracted parameters including supplemental phase information using a second bit allocation when a signal in a frame is determined to be in said transition state mode.

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