An implementation of the complex Quadrature Mirror Filterbank (QMF) described in [1]. More...

#include "saf_utility_complex.h"

Enumerations
enum	QMF_FDDATA_FORMAT { QMF_BANDS_CH_TIME , QMF_TIME_CH_BANDS }
	Options for how the frequency domain data is permuted when using qmf. More...

Functions
void	qmf_create (void **const phQMF, int nCHin, int nCHout, int hopsize, int hybridmode, QMF_FDDATA_FORMAT format)
	Creates an instance of the qmf filterbank.

void	qmf_destroy (void **const phQMF)
	Destroys an instance of the qmf filterbank.

void	qmf_analysis (void const hQMF, float dataTD, int framesize, float_complex **dataFD)
	Performs QMF analysis of the input time-domain signals.

void	qmf_synthesis (void const hQMF, float_complex dataFD, int framesize, float dataTD)
	Performs QMF synthesis of the input frequency-domain signals.

void	qmf_channelChange (void *const hQMF, int new_nCHin, int new_nCHout)
	Changes the number input and/or output channels.

void	qmf_clearBuffers (void *const hQMF)
	Flushes the analysis and synthesis buffers with zeros.

int	qmf_getProcDelay (void *const hQMF)
	Returns the processing delay in samples.

int	qmf_getNBands (void *const hQMF)
	Returns the number of frequency bands.

void	qmf_getCentreFreqs (void const hQMF, float fs, int nBands, float centreFreq)
	Computes the QMF/hybrid-QMF centre frequencies.

void	qmf_FIRtoFilterbankCoeffs (float hIR, int N_dirs, int nCH, int ir_len, int hopSize, int hybridmode, float_complex hFB)
	Converts FIR filters into Filterbank Coefficients by passing them through the QMF filterbank.

Detailed Description

An implementation of the complex Quadrature Mirror Filterbank (QMF) described in [1].

See also: [1] Herre, J., Purnhagen, H., Breebaart, J., Faller, C., Disch, S., Kjörling, K., Schuijers, E., Hilpert, J. and Myburg, F., 2005. The reference model architecture for MPEG spatial audio coding.

Definition in file saf_utility_qmf.h.

Enumerations