(8.D.2.3) CrossFader
- Catherine Spain
Overview
Cross fader
Discussion
The Cross Fader module mixes two signals according to a Control value. The module has three inputs. The Control is implemented in first which is a scalar value from 0 to 1. The other two inputs are the audio inputs A and B. The output corresponds to the weighted addition of signals A and B according to the Control value. If the Control is 0, then the output equals A. If the Control equals 1, the output equals B.
Type Definition
typedef struct _ModuleCrossFader
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
FLOAT32 smoothingTime; // Time constant of the smoothing process
INT32 mixType; // Selects the type of curve: Linear=0, Energy=1.
FLOAT32 currentGainA; // Instantaneous gain applied to channel A.
FLOAT32 currentGainB; // Instantaneous gain applied to channel B.
FLOAT32 smoothingCoeff; // Smoothing coefficient
} ModuleCrossFaderClass;Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
smoothingTime | float | parameter | 0 | 10 | 0:1000 | msec |
mixType | int | parameter | 0 | 0 | 0:1 | Â |
currentGainA | float | state | 1 | 0.5 | 0:1 | Â |
currentGainB | float | state | 1 | 0.5 | 0:1 | Â |
smoothingCoeff | float | derived | 1 | 0.002081 | Unrestricted | Â |
Pins
Input Pins
Name: g
Description: cross-fader value
Data type: float
Channel range: 1
Block size range: Unrestricted
Sample rate range: Unrestricted
Complex support: Real
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Name: inA
Description: audio input A
Data type: float
Channel range: Unrestricted
Block size range: Unrestricted
Sample rate range: Unrestricted
Complex support: Real
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Name: inB
Description: audio input B
Data type: float
Channel range: Unrestricted
Block size range: Unrestricted
Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: Audio output
Data type: float
MATLAB Usage
File Name: cross_fader_module.m
M=cross_fader_module(NAME)
Creates a cross fader module for Audio Weaver.
Arguments:
NAME - name of the module.Â