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
currentGainA	float	state	1	0.5	0:1
currentGainB	float	state	1	0.5	0:1
smoothingCoeff	float	derived	1	0.002081	Unrestricted

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

Name: inA

Description: audio input A

Data type: float

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

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.