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Overview

General purpose multiplexor

Discussion

This module has a variable number of input pins and routes (or copies) one of these pins to the output pin, while smoothly varying the multiplexor module with fade time between input pin transitions.

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The module can also be configured to output zeros between transitions. The variable fadeTime specifies the silence period, in msec, when transitions occur.

Type Definition

Code Block
typedef struct _ModuleMultiplexorV2
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 index;                                  // Specifies which input pin to route to the output. The index is zero based.
    FLOAT32 smoothingTime;                        // Time constant of the smoothing process
    FLOAT32 fadeTime;                             // Silence time in crossfade
    INT32 isControl;                              // Indicates if the index is controlled by an external signal
    FLOAT32 smoothingCoeff;                       // Smoothing coefficient
    FLOAT32 oldSrcGain;                           // Instanteous gain being applied to the old source. This is an internal variable used in the smoothing process
    FLOAT32 newSrcGain;                           // Instanteous gain being applied to the new source. This is an internal variable used in the smoothing process
    INT32 fadeState;                              // State variable for determining when to transitioning between inputs
    INT32 fadeStateInit;                          // Derived from fadeTime, determines number of blocks to wait before switching input pins
    INT32 oldIndex;                               // This is the index that is currently being used
    INT32 newIndex;                               // This is the index being transitioned to
} ModuleMultiplexorV2Class;

Variables

Properties

Name

Type

Usage

isHidden

Default value

Range

Units

index

int

parameter

0

0

0:2

smoothingTime

float

parameter

0

10

0:100

msec

fadeTime

float

parameter

0

0

0:100

msec

isControl

int

const

1

1

Unrestricted

smoothingCoeff

float

derived

1

0.002081

Unrestricted

oldSrcGain

float

state

1

1

Unrestricted

newSrcGain

float

state

1

0

Unrestricted

fadeState

int

state

1

0

Unrestricted

fadeStateInit

int

derived

1

0

Unrestricted

oldIndex

int

parameter

1

0

Unrestricted

newIndex

int

parameter

1

0

Unrestricted

Pins

Input Pins

Name: Ctrl

Description: Input pin control signal

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Complex support: Real and Complex

Output Pins

Name: out

Description: Output signal

Data type: float

MATLAB Usage

File Name: multiplexor_v2_module.m

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