Voice Enchancement Functions

This section describes the Intel IPP functions for echo control, noise removal, automatic audio level control.

The complete list of the Intel IPP voice enchancement functions is given in the table below.

Intel IPP Voice Enchantment Functions
Function Base Name	Operation
Echo Canceller Functions
SubbandProcessGetSize	Calculates size of the subband process state structure.
SubbandProcessInit	Initializes the subband process state structure.
SubbandAnalysis	Decomposes a frame into a complex subband representation
SubbandSynthesis	Reconstructs frame from a complex subband representation.
SubbandControllerGetSize_EC	Calculates size of the subband controller state structure.
SubbandControllerInit_EC	Initializes the subband controller state structure.
SubbandControllerReset_EC	Resets subband controller state.
SubbandController_EC	Updates filter coefficients and returns output gain coefficients.
SubbandControllerUpdate_EC	Updates controller state and returns the step sizes.
SubbandControllerDTGetSize_EC	Calculates size of the subband DT controller state structure.
SubbandControllerDTInit_EC	Initializes the subband DT controller state structure.
SubbandControllerDTReset_EC	Resets subband DTcontroller state.
SubbandControllerDT_EC	Updates filter coefficients and returns output gain coefficients.
SubbandControllerDTUpdate_EC	Updates DT controller state and returns the step sizes.
ToneDetectGetStateSize_EC	Calculates size of the tone detector state structure.
ToneDetectInit_EC	Initializes the tone detector state structure.
ToneDetect_EC	Detects the signal of 2100 Hz frequency with every 450 ms phase reversal.
FullbandControllerGetSize_EC	Calculates size of the fullband controller state structure.
FullbandControllerInit_EC	Initializes the fullband controller state structure.
FullbandControllerUpdate_EC	Updates the fullband controller state and returns the step sizes.
FullbandController_EC	Updates filter coefficients and returns output gain coefficients.
FullbandControllerReset_EC	Resets fullband controller state.
FIR_EC	Computes FIR filter results.
FIRSubband_EC, FIRSubbandLow_EC	Computes the frequency-domain adaptive filter output.
FIRSubbandCoeffUpdate_EC, FIRSubbandLowCoeffUpdate_EC	Updates the adaptive filter coefficients.
NLMS_EC	Performs FIR filtering with coefficients update.
Noise Reduction Functions
FilterNoiseGetStateSize	Calculates the size of the state structure for the noise reduction filter.
FilterNoiseInit	Initializes the state structure for the noise reduction filter.
FilterNoiseLevel	Sets the amplifier of the noise reduction filter.
FilterNoiseDetect_EC	Performs the noise detection.
FilterNoiseDetectModerate_EC	Performs the noise detection on signals with echo.
FilterNoiseSetMode_EC	Sets type of the smoothing filter.
FilterNoise	Performs the noise reduction filtering.
Automatic Audio Level Control Functions
ALCGetStateSize_G169	Returns the size of the ALC state structure.
ALCInit_G169	Initializes ALC state structure.
ALCSetLevel_G169	Sets ALC algorithm target and clipping levels.
ALCSetGain_G169	Sets ALC algorithm maximum gain value.
ALC_G169	Performs the automatic level control.