(8.D.2.3) MuteNSmoothedFract32
- Catherine Spain
Overview
Multichannel mute module
Discussion
Multichannel smoothly varying mute module. The array .isMuted has a separate value for each channel in the signal. The size of .isMuted is set by the prebuild function. You can also separately specify the initial length of the array using the optional second argument to the function. In all cases, the array length is updated by the prebuild function.
The module does smooth muting and unmuting. The speed of the smoothing operation is set by the .smoothingTime variable. The module's set function translates the smoothingTime to an internal smoothingCoeff. When the module is built it starts out in a converged state.
By default, the inspector for the module has the control checkboxes organized in a vertical stack. By setting the optional third argument TRANSPOSE = 1 turns the control into a horizontal stack.
Type Definition
typedef struct _ModuleMuteNSmoothedFract32
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
FLOAT32 smoothingTime; // Time constant of the smoothing process
fract32 smoothingCoeff; // Smoothing coefficient.
INT32* isMuted; // Boolean that controls muting/unmuting. One per channel.
fract32* currentGain; // Instantaneous gain applied by the module. This is also the starting gain of the module.
fract32* gain; // Target gain.
} ModuleMuteNSmoothedFract32Class;Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
smoothingTime | float | parameter | 0 | 10 | 0:1000 | msec |
smoothingCoeff | fract32 | derived | 1 | 0.002081 | Unrestricted | Â |
isMuted | int* | parameter | 0 | [1 x 1] | 0:1 | Â |
currentGain | fract32* | state | 1 | [1 x 1] | 0:1 | linear |
gain | fract32* | derived | 1 | [1 x 1] | 0:1 | linear |
Pins
Input Pins
Name: in
Description: audio input
Data type: fract32
Channel range: Unrestricted
Block size range: Unrestricted
Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: audio output
Data type: fract32
MATLAB Usage
File Name: muten_smoothed_fract32_module.m
M=muten_smoothed_fract32_module(NAME, NUMCHANNELS, TRANSPOSE)
Creates a multichannel mute module in which there is a separate control
per channel. Arguments:
NAME - name of the module.
NUMCHANNELS - optional argument that specifies the initial number
of channels in the wire. When the system is built, the number
of channels is derived by pin propagation. This value is only
for the initial behavior before the system is built. By default,
NUMCHANNELS = 1.
TRANSPOSE - an optional argument which controls how the inspector
for the module is drawn. By default, if there are N channels
then the inspector control is a vertical stack of N checkboxes.
(TRANSPOSE = 0 by default). If TRANSPOSE = 1, then the inspector
is drawn as a horizontal array of N checkboxes.Â