G.729.1 Functions

This section describes the Intel IPP functions that can be used in implementing speech codecs following ITU-T recommendations G.729.1 (ex.G729EV) [ITU7291]. The primitives are primarily designed to implement the well-defined, computationally expensive core operations that comprise the codec portion of the G729.1 system. The G729.1 codec comprises an algorithm extending ITU-T G.729 [ITU729] for the scalable coding of narrowband and wideband speech and audio signals at 8-32 kbit/s. The output of the G.729.1 codec has a bandwidth of 50-4000 Hz at 8 and 12 kbit/s and 50-7000 Hz from 14 to 32 kbit/s. At 8 kbit/s, G.729.1 is fully interoperable with G.729 [ITU729], G.729 Annex A [ITU729A] and G.729 Annex B [ITU729B].

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

Intel IPP G.729.1 Functions
Function Base Name	Operation
FilterHighpassGetStateSize_G7291	Returns the size of the high-pass filter state memory.
FilterHighpassInit_G7291	Returns the size of the high-pass filter state memory.
FilterHighpass_G7291	Performs high-pass filtering.
FilterLowpass_G7291	Performs high-pass filtering.
QMFGetStateSize_G7291	Returns the size of the QMF encode state memory.
QMFInit_G7291	Initializes the state memory of QMF filter.
QMFEncode_G7291	Performs QMF analysis filtering.
QMFDecode_G7291	Performs QMF synthesis filtering.
LSFDecode_G7291	Decodes the quantized LSFs.
AdaptiveCodebookSearch_G7291	Searches for the integer delay and the fraction delay, and computes the adaptive vector.
AdaptiveCodebookGain_G7291	Calculates the gain of the adaptive-codebook vector and the filtered codebook vector.
AlgebraicCodebookSearchL1_G7291, AlgebraicCodebookSearchL2_G7291	Performs the fixed (algebraic) codebook search.
GainQuant_G7291	Quantizes the codebook gain using a two-stage conjugate-structured codebook.
EnvelopTime_G7291	Computes the time envelope parameters.
EnvelopFrequency_G7291	Computes the frequency envelope parameters.
GenerateExcitationGetStateSize_G7291	Calculates the size of the state memory for generation of the excitation signal.
GenerateExcitationInit_G7291	Initializes the state memory for generation of the excitation signal.
GenerateExcitation_G7291	Performs generation of the excitation signal.
ShapeEnvelopTime_G7291	Performs the shaping of the time envelope of the excitation signal.
ShapeEnvelopFrequency_G7291	Performs the shaping of the frequency envelope of the excitation signal.
CompressEnvelopTime_G7291	Performs an adaptive amplitude compression.
MDCTFwd_G7291	Computes forward MDCT.
MDCTInv_G7291	Computes inverse MDCT
MDCTQuantFwd_G7291	Performs split spherical vector quantization.
MDCTQuantInv_G7291	Performs inverse split spherical vector quantization.
MDCTPostProcess_G7291	Performs post-processing oh higher-band MDCT coefficients.
GainControl_G7291	Compensates for the tilt in the short-term filter.
TiltCompensation_G7291	Compensates for the tilt in the short-term filter.
QuantParam_G7291	Quantizes of the TDBWE parameter set by "mean removed VQ".