DelayciFract32

Overview

Cubic interpolated time delay Fractional version

Discussion

An interpolated Fractional delay module, where the delay is specified as a fractional number of samples. The delay is implemented such that delays as short as 0 samples can be realized. The module has one multichannel input and one multichannel output. The module can operate on multiple channels and applies the same delay to each channel.

At construction time, you specify the maximum delay (maxDelay) of the module. maxDelay determines the size of the internal state buffer. To be precise, the size of the internal state buffer equals (maxDelay+1)*numChannels. In addition, you specify the instantaneous delay through the interface variable .currentDelay.
currentDelay is in the range [0 maxDelay] and can be changed at run-time. currentDelay can be specified as a fractional delay value. 4nd order cubic interpolation is used.
Note that the module is not smoothly updating and you may get audible clicks when adjusting the currentDelay at run-time.

Module Pack

Advanced

ClassID

classID = 1255

Type Definition

typedef struct _ModuleDelayciFract32
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
INT32 maxDelay;                               // Maximum delay that can be realized, in samples.  The size of the delay buffer (maxDelay+1)*numChannels
FLOAT32 currentDelay;                         // Current delay
fract32 currentDelayFract32;                  // Current delay in Fract32 format
FLOAT32 modDepth;                             // Maximum depth, in samples, of the modulation signal
fract32 modDepthFract32;                      // Maximum depth, in samples, of the modulation signal
INT32 postShift;                              // Number of bits to shift
INT32 stateIndex;                             // Index of the oldest state variable in the array of state variables
INT32 stateHeap;                              // Heap in which to allocate memory
fract32* state;                               // State variable array
} ModuleDelayciFract32Class;

Variables

Properties

Name	Type	Usage	isHidden	Default Value	Range	Units
maxDelay	int	const	0	100	1:100000	samples
currentDelay	float	parameter	0	0	0:0.1:100	samples
currentDelayFract32	fract32	derived	0	0	Unrestricted
modDepth	float	parameter	0	0	0:0.1:100	samples
modDepthFract32	fract32	derived	0	0	Unrestricted
postShift	int	derived	1	16	Unrestricted
stateIndex	int	state	1	0	Unrestricted
stateHeap	int	const	1	561	Unrestricted
state	fract32*	state	1	[1 x 101]	Unrestricted

Pins

Input Pins


Name	mod
Description	modulation input
Data type	fract32
Channel range	1
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real


Name	in
Description	audio input
Data type	fract32
Channel range	Unrestricted
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real

Output Pins


Name	out
Description	audio output
Data Type	fract32

Matlab Usage

File Name: delayci_fract32_module.m 
 M=delayci_fract32_module(NAME, MAXDELAY, MEMHEAP) 
 Creates a fractional sample time delay for use in the Audio Weaver.  Arguments: 
 Arguments: 
    NAME - name of the module. 
    MAXDELAY - Maximum delay, in samples. 
    MEMHEAP - specifies the memory heap to use to allocate the main 
              state buffer.  This is a string and follows the memory 
              allocation enumeration in Framework.h.  Allowable values 
              are: 
              'AWE_HEAP_FAST' - always use internal DM memory. 
              'AWE_HEAP_FASTB' - always use internal PM memory. 
              'AWE_HEAP_SLOW' - always use external memory. 
              'AWE_HEAP_FAST2SLOW' - use internal memory.  If this fails 
                 then use external memory (the default). 
              'AWE_HEAP_FASTB2SLOW' - use internal memory.  If this fails 
                 then use external memory.