G.728 Functions

This section describes Intel IPP functions that can be used in implementing speech codecs following ITU-T* recommendation G.728 with Annexes I, H [ITU728].

These functions are used in the Intel IPP G.728 Speech Encoder-Decoder sample downloadable from http://www.intel.com/cd/software/products/asmo-na/eng/220046.htm.

The list of these functions is given in the table below.

Intel IPP G.728 Functions
Function Base Name	Operation
IIRGetStateSize_G728	Gets the size of IIR state structure to be used.
IIRInit_G728	Initializes the IIR state structure.
IIR_G728	Applies IIR filter to multiple samples.
SynthesisFilterGetStateSize_G728	Gets the size of synthesis filter state structure.
SynthesisFilterInit_G728	Initializes the synthesis filter state structure.
SynthesisFilter_G728	Applies the synthesis filter to multiple samples.
CombinedFilterGetStateSize_G728	Gets the size of combined filter state structure.
CombinedFilterInit_G728	Initializes the combined filter state structure.
CombinedFilter_G728	Applies the combined filter to multiple samples.
PostFilterGetStateSize_G728	Gets the size of the post filter state structure.
PostFilterInit_G728	Initializes the post filter state structure.
PostFilter_G728	Applies the post filter to multiple samples.
PostFilterAdapterGetStateSize_G728	Gets the size of the IppsPostFilterAdapterStatestructure to be used.
PostFilterAdapterInit_G728	Initializes the IppsPostFilterAdapterStatestructure.
LPCInverseFilter_G728	Computes the LPC prediction residual.
PitchPeriodExtraction_G728	Extracts pitch period from the LPC prediction residual.
WinHybridGetStateSize_G728	Gets the size of hybrid windowing module state structure.
WinHybridInit_G728	Initializes the hybrid windowing module state structure.
WinHybrid_G728	Applies the hybrid windowing.
LevinsonDurbin_G728	Calculates LP coefficients from the autocorrelation coefficients.
CodebookSearch_G728	Searches the codebook for the best code vector.
CodebookSearchTCQ_G728	Performs codebook search by Trellis-Coded Quantization.
ImpulseResponseEnergy_G728	Implements shape codebook vector convolution and energy calculation.