Adaptive Codebook Functions

This section describes primitives that are concerned with various aspects of the adaptive codebook, including primitives that perform the following functions:

• Open-loop pitch search, including Non-DTX, VAD1, and VAD2

• Impulse response and target signal computation

• Adaptive codebook search

• Decoding of the adaptive codebook vector.

• Open-Loop Pitch (OLP) Search
  
• OpenLoopPitchSearchNonDTX_GSMAMR
  Computes the OLP lag.
• OpenLoopPitchSearchDTXVAD1_GSMAMR
  Extracts an OLP lag estimate (VAD 1 scheme is enabled).
• OpenLoopPitchSearchDTXVAD2_GSMAMR
  Extracts an OLP lag estimate (VAD 2 scheme is enabled).
• ImpulseResponseTarget_GSMAMR
  Computes the impulse response and target signal required for the adaptive codebook search.
• AdaptiveCodebookSearch_GSMAMR
  Performs the adaptive codebook search.
• AdaptiveCodebookDecode_GSMAMR
  Decodes the adaptive codebook parameters.
• AdaptiveCodebookGain_GSMAMR
  Calculates the gain of the adaptive-codebook vector and the filtered codebook vector.

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