(8.D.2.7) DelayMsec
- Sam Stuart
Overview
Time delay in which the delay is specified in milliseconds
Discussion
A delay module, where the delay is specified in milliseconds. 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, specify the maximum delay time (maxDelayTime) of the module. The variable, maxDelayTime determines the size of the internal state buffer. The size of the internal state buffer equals (maxDelay+1)*numChannels. In addition, the instantaneous delay is specified through the interface variable, currentDelay. currentDelay is in the range of [0 maxDelayTime] and can be changed at run-time.
delay = floor( currentDelay * SR ) / SR
Note that the module is not smoothly updating and you may get audible clicks when adjusting the currentDelay at run-time.
Type Definition
typedef struct _ModuleDelayMsec
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
FLOAT32 maxDelayTime; // Maximum delay, in milliseconds.
FLOAT32 currentDelayTime; // Current delay.
INT32 stateHeap; // Heap in which to allocate state buffer memory.
awe_modDelayInstance *delay; // Time delay in which the delay is specified in samples
} ModuleDelayMsecClass;Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
maxDelayTime | float | const | 0 | 10 | 0:10 | msec |
currentDelayTime | float | parameter | 0 | 0 | 0:10 | msec |
stateHeap | int | const | 1 | 561 | Unrestricted | Â |
Pins
Input Pins
Name: in
Description: Audio Input
Data type: {float, int, fract32}
Channel range: Unrestricted
Block size range: Unrestricted
Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: Audio output
Data type: {float, int, fract32}
MATLAB Usage
File Name: delaymsec_module.m
SYS=delaymsec_module(NAME, MAXDELAY, MEMHEAP)
Creates a delay module in which the delay times are specified in
milliseconds.
Arguments:
NAME - name of the module.
MAXDELAY - maximum delay of the module, in milliseconds.
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.
Internally, this uses a the sample-based delay and builds an inteface
on top of it.Â