Overview

Provides fractional delay

Discussion

This subsystem implements a delay module providing a fractional number of samples of delay. A delay of the form N.x may be specified where N is an integer number of samples and x is a float between 0.0 and 1.0. The N.x delay is achieved by cascading a sample delay module and a FIR filter. The FIR filter is designed to provide the fractional portion of the delay between 0.0 to 1.0. The delay of N.x samples can be set in real time with an inspector. Each time N.x is changed a new set of filter coefficients is computed, and the internal sample delay module is set to N. NOTE: The FIR filter itself has a delay of 20 samples. Thus this module has a minimum delay of 20 samples. This is shown on the inspector. Input and output data for this module are floating point.

Type Definition

typedef struct _ModuleFractionalDelayV2
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 maxDelay;                               // Maximum delay, in samples. The size of the delay buffer is maxDelay*numChannels.
    FLOAT32 floatCurrentDelay;                    // total delay
    awe_modDelayInstance *ConstantDelay; // Time delay in which the delay is specified in samples
    awe_modFIRInstance *FIRmodule; // FIR filter 
} ModuleFractionalDelayV2Class;

Variables

Properties

Name	Type	Usage	isHidden	Default value	Range	Units
maxDelay	int	const	0	300	Unrestricted	samples
floatCurrentDelay	float	parameter	0	20	20:321	Samples

Pins

Input Pins

Name: in

Description: Audio Input

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

Scratch Pins

Channel count: 1

Block size: 32

Sample rate: 48000

MATLAB Usage

File Name: fractional_delay_v2_module.m

 Create a subsystem that implements fractional delay module
   ARGUMENTS:
   NAME - name of the module.
   MAXDELAY - maximum delay provided by the module.