(8.D.2.1) SbSplitter
- Catherine Spain
Owned by Catherine Spain
Overview
Subband splitter module
Type Definition
typedef struct _ModuleSbSplitter
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
INT32 numOut; // Number of output pins
FLOAT32* bandEdges; // Cutoff frequencies between bands, in Hz
FLOAT32* transitionWidths; // Width of the transition region between bands (Hz or Octave)
FLOAT32* gains; // Internal array of gain factors. Each column represents a different output.
} ModuleSbSplitterClass;Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
numOut | int | const | 0 | 2 | Unrestricted | Â |
bandEdges | float* | parameter | 0 | [1 x 1] | 0:24000 | Â |
transitionWidths | float* | parameter | 0 | [1 x 1] | 0:24000 | Â |
gains | float* | derived | 1 | [129 x 2] | Unrestricted | Â |
Pins
Input Pins
Name: in
Description: audio input
Data type: float
Channel range: Unrestricted
Block size range: Unrestricted
Sample rate range: Unrestricted
Complex support: Real and Complex
Output Pins
Name: out1
Description: audio output
Data type: float
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Name: out2
Description: audio output
Data type: float
MATLAB Usage
File Name: sb_splitter_module.m
M = sb_splitter_module(NAME, NUMOUT, FFTSIZE)
Creates a module which splits subband data into separate frequency
bands. In some sense, it acts like a multiband crossover based on
linear gains within each subband. The gains are 1.0 in the center of
each band and a cosine window is used for smoothing between bands.
The width of the smoothing interval between each pair of bands can
be individually set. The module operates on real or complex subband
data. Arguments:
NAME - name of the module.
NUMOUT - number of output bands. By default = 2.
FFTSIZE - optional argument which sets the default size of the array.
By default, FFTSIZE = 256 and the internal gain arrays have
a length of 257.
The module's processing function copies the input data to each
output pin and applies a linear set of frequency gains. The
gains are different for each output pin and the gains are computed
by the module's set function.Â