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Overview

High order allpass structure with integer time delays

Discussion

The allpass_delay_module.m and allpass_delay16_module.m implement the digital system shown below:

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Both modules operate on mono data only.

Type Definition

Code Block
typedef struct _ModuleAllpassDelay
{
   &nbspModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
   &nbspINT32 maxDelay;                               // Maximum delay that can be realized, in samples. The size of the delay buffer (maxDelay+1)*numChannels
   &nbspINT32 currentDelay;                           // Current delay
   &nbspFLOAT32 coef;                                 // Feedback/-feedforward coefficient for the allpass delay.
   &nbspINT32 stateIndex;                             // Index of the oldest state variable in the array of state variables
   &nbspFLOAT32* state;                               // State variable array
} ModuleAllpassDelayClass;

Variables

Properties

Name

Type

Usage

isHidden

Default value

Range

Units

maxDelay

int

const

0

100

1:100000

samples

currentDelay

int

parameter

0

0

0:1:100

samples

coef

float

parameter

0

0.5

-1:1

stateIndex

int

state

1

0

Unrestricted

state

float*

state

1

[1 x 101]

Unrestricted

Pins

Input Pins

Name: in

Description: audio input

...

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: audio output

...

Description: audio output

Data type: float

MATLAB Usage

File Name: allpass_delay_module.m

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