saf_utility_qmf.c File Reference

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

#include "saf_utilities.h"
#include "saf_externals.h"

Go to the source code of this file.

Data Structures
struct	qmf_data
	Data structure for the complex-QMF filterbank. More...

Macros
#define	QMF_MAX_HOP_SIZE   ( 128 )
	Maximum hop size supported.
#define	QMF_HYBRID_FILTER_LENGTH   ( 13 )
	Hybrid-filter length.
#define	QMF_NBANDS_2_SUBDIVIDE   ( 3 )
	Number of QMF bands to subdivide.

Functions
static void	qmfAnalyse (float *inTD, int nSamplesTD, int nCH, int hopSize, int hybridmode, float_complex *outTF)
	Passes input time-domain data through the QMF filterbank.
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.

Variables
static const double	__qmf_protofilter [1280]
	Prototype filter/window.
static const double	__qmf_fb8bandCoeffs [13]
	Coefficients to subdivide the lowest QMF band into 8 subbands: ~ 0.125*kaiser(13, 4.6)
static const double	__qmf_fb4bandCoeffs [13]
	Coefficients to subdivide the 2nd & 3rd lowest QMF bands into 4 subbands.
static const float	__qmf2hybCentreFreq [10][QMF_NBANDS_2_SUBDIVIDE]
	Matrix for converting the centre frequencies of the first 3 QMF bands into the centre frequencies for the 10 hybrid bands.

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.

Author

Leo McCormack

Date

14.07.2020

License

ISC

Definition in file saf_utility_qmf.c.

Macro Definition Documentation

QMF_HYBRID_FILTER_LENGTH

#define QMF_HYBRID_FILTER_LENGTH   ( 13 )

Hybrid-filter length.

Definition at line 36 of file saf_utility_qmf.c.

QMF_MAX_HOP_SIZE

#define QMF_MAX_HOP_SIZE   ( 128 )

Maximum hop size supported.

Definition at line 35 of file saf_utility_qmf.c.

QMF_NBANDS_2_SUBDIVIDE

#define QMF_NBANDS_2_SUBDIVIDE   ( 3 )

Number of QMF bands to subdivide.

Definition at line 37 of file saf_utility_qmf.c.

Function Documentation

qmfAnalyse()

static void qmfAnalyse ( float * inTD, int nSamplesTD, int nCH, int hopSize, int hybridmode, float_complex * outTF )

static

Passes input time-domain data through the QMF filterbank.

Definition at line 68 of file saf_utility_qmf.c.

Variable Documentation

__qmf2hybCentreFreq

const float __qmf2hybCentreFreq[10][QMF_NBANDS_2_SUBDIVIDE]

static

Initial value:

=
{ { 0.1013f, 0.0f,    0.0f},
  { 0.2027f, 0.0f,    0.0f},
  { 0.4054f, 0.0f,    0.0f},
  { 0.8108f, 0.0f,    0.0f},
  { 1.2533f, 0.0f,    0.0f},
  { 1.7227f, 0.0f,    0.0f},
  { 0.0f,    0.9039f, 0.0f},
  { 0.0f,    1.1228f, 0.0f},
  { 0.0f,    0.0f,    0.9424f},
  { 0.0f,    0.0f,    1.0672f} }

Matrix for converting the centre frequencies of the first 3 QMF bands into the centre frequencies for the 10 hybrid bands.

Definition at line 55 of file saf_utility_qmf.c.

__qmf_fb4bandCoeffs

const double __qmf_fb4bandCoeffs[13]

static

Initial value:

=
{    0.0000000000000, 0.0189948752516, 0.0000000000000, -0.0729313916667, 0.0000000000000, 0.3059663054427, 0.5000000000000, 0.3059663054427, 0.0000000000000, -0.0729313916667, 0.0000000000000, 0.0189948752516, 0.0000000000000    }

Coefficients to subdivide the 2nd & 3rd lowest QMF bands into 4 subbands.

Definition at line 49 of file saf_utility_qmf.c.

__qmf_fb8bandCoeffs

const double __qmf_fb8bandCoeffs[13]

static

Initial value:

=
{    0.0074608293425, 0.0227042095837, 0.0454686594059, 0.0726611394476, 0.0988510858112, 0.1179371056821, 0.1250000000000, 0.1179371056821, 0.0988510858112, 0.0726611394476, 0.0454686594059, 0.0227042095837, 0.0074608293425    }

Coefficients to subdivide the lowest QMF band into 8 subbands: ~ 0.125*kaiser(13, 4.6)

Definition at line 45 of file saf_utility_qmf.c.

__qmf_protofilter

const double __qmf_protofilter[1280]

static

Initial value:

=
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Prototype filter/window.

Definition at line 40 of file saf_utility_qmf.c.