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Digital speech processing system

  • US 6,420,986 B1
  • Filed: 08/02/2000
  • Issued: 07/16/2002
  • Est. Priority Date: 10/20/1999
  • Status: Active Grant
First Claim
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1. A method of operation in a speech processing system, including receiving an incoming audio frequency signal by the speech processing system, amplifying the incoming audio frequency signal by an audio gain factor, representing the amplified audio signal by a finite range of audio levels, and adjusting the audio gain factor by applying the following steps:

  • in an attack mode initiated when a speech signal is detected to be present, analyzing one or more speech blocks of the amplified audio frequency signal to determine whether clipping of the amplified audio frequency signal has taken place;

    in a hold mode applied whilst no gain adjustment is being applied and when it is detected in the attack mode that clipping has taken place, analyzing the energy level of one or more blocks of the amplified audio frequency signal to determine what required adjustment should be applied to the audio gain factor; and

    in a release mode applied following the hold mode, adjusting the audio gain factor according to the required adjustment determined in the hold mode.

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