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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 _ModuleAllpassDelay16Fract32
{
   &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.
   &nbspfract32 coefFract32;                          // Feedback/-feedforward fractional coefficient for the allpass delay.
   &nbspINT32 postShift;                              // Number of bits to shift after the fractional multiply. This is based on coef.range.
   &nbspINT32 stateIndex;                             // Index of the oldest state variable in the array of state variables
   &nbspINT32* state;                                 // State variable array
} ModuleAllpassDelay16Fract32Class;

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

coefFract32

fract32

derived

0

0.5

Unrestricted

postShift

int

derived

1

0

Unrestricted

stateIndex

int

state

1

0

Unrestricted

state

int*

state

1

[51 x 1]

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: fract32

MATLAB Usage

File Name: allpass_delay_module.m

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