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Overview

A smoothed mixer module with M outputs and N inputs

Discussion

This time delay module has multiple input and multiple output channels. Smoothed delay can be applied at each intersections of the input and output lines. The delays and gains to be applied at each intersection comes from the control pin. Delays are specified in milliseconds and are in the range of [0 MAXDELAY].

At construction time, you specify the maximum delay (maxDelay) of the module. The variable, maxDelay determines the size of the internal state buffer. The size of the internal state buffer equals (maxDelay+1)*numChannels samples. The module applies smooth cross fading when delay or gain values are changed at run-time.

Type Definition

Code Block
typedef struct _ModuleMultichannelMixerSmoothed
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    FLOAT32 maxDelayTime;                         // Maximum delay, in milliseconds.
    FLOAT32 smoothingTimeDelay;                   // Time constant of the cross fading process of delay
    FLOAT32 smoothingTimeGain;                    // Time constant of the cross fading process of gain
    FLOAT32 smoothingCoeff;                       // Smoothing coefficient for cross fading of delays.
    FLOAT32 smoothingCoeffGain;                   // Smoothing coefficient for cross fading of gains.
    INT32 stateHeap;                              // Heap in which to allocate memory.
    INT32 maxDelay;                               // Max delay in samples.
    INT32* prevDelay;                             // Array holding previous delay values.
    INT32* currentDelay;                          // Array holding current delay values.
    FLOAT32* prevGain;                            // Array holding previous gain values.
    FLOAT32* currentGain;                         // Array holding current gain values.
    FLOAT32* oldGain;                             // Gain parameter for cross fading of delay.
    FLOAT32* newGain;                             // Gain parameter for cross fading of delay.
    INT32* fadingDone;                            // State variable to implement cross fading of delay.
    INT32* stateIndex;                            // Index of the oldest state variable in the array of state variables.
    FLOAT32* state;                               // State variable array.
} ModuleMultichannelMixerSmoothedClass;

Variables

Properties

Name

Type

Usage

isHidden

Default value

Range

Units

maxDelayTime

float

const

0

10

0:10

msec

smoothingTimeDelay

float

parameter

0

10

0:1000

msec

smoothingTimeGain

float

parameter

0

10

0:1000

msec

smoothingCoeff

float

derived

1

0.002081

Unrestricted

smoothingCoeffGain

float

derived

1

0.002081

Unrestricted

stateHeap

int

const

1

561

Unrestricted

maxDelay

int

const

1

480

Unrestricted

prevDelay

int*

state

1

[1 x 1]

Unrestricted

samples

currentDelay

int*

state

1

[1 x 1]

Unrestricted

samples

prevGain

float*

state

1

[1 x 1]

Unrestricted

samples

currentGain

float*

state

1

[1 x 1]

Unrestricted

samples

oldGain

float*

state

1

[1 x 1]

Unrestricted

newGain

float*

state

1

[1 x 1]

Unrestricted

fadingDone

int*

state

1

[1 x 1]

0:1

stateIndex

int*

state

1

[1 x 1]

Unrestricted

state

float*

state

1

[1 x 514]

Unrestricted

Pins

Input Pins

Name: in

Description: audio input

...

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: Audio output

Data type: float

Scratch Pins

Channel count: 1

Block size: 32

...

Block size: 32

Sample rate: 48000

MATLAB Usage

File Name: multichannel_mixer_smoothed_module.m

...