DelayMixerSmoothed

Overview

A smoothed mixer module with M outputs and N inputs

Discussion

This implements the same functionality as MultiChannelMixerSmoothed module, but is significantly more efficient, both in speed and memory.

This time delay module has multiple input and multiple output channels with real data only. Smoothed delay can be applied at each intersections of the input and output lines. The delays and gains to be applied at each intersection comes from the control pin in interleaved order gainIn1Out1, delayIn1Out1, gainIn2Out1, delayIn2Out1 and so on. Delays are specified in milliseconds and are in the range of [0 MAXDELAY]. The module internally limits the applied delay to this range.

At construction time, you specify the maximum delay (maxDelay) of the module. The variable, maxDelay determines the size of the internal state buffer. The size of the internal state buffer equals (maxDelay+1)*numChannels samples. The module applies smooth cross fading when delay or gain values are changed at run-time.

When the module is bypassed, it copies the ith input channel to the ith output channel. If the module has more output channels than input channels, the remaining output channels are set to 0.

Module Pack

Advanced

ClassID

classID = 1438

Type Definition

typedef struct _ModuleDelayMixerSmoothed
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
FLOAT32 maxDelayTime;                         // Maximum delay, in milliseconds.
FLOAT32 smoothingTimeDelay;                   // Time constant of the cross fading process of delay
FLOAT32 smoothingTimeGain;                    // Time constant of the cross fading process of gain 
FLOAT32 smoothingCoeff;                       // Smoothing coefficient for cross fading of delays.
FLOAT32 smoothingCoeffGain;                   // Smoothing coefficient for cross fading of gains.
INT32 stateHeap;                              // Heap in which to allocate memory.
INT32 maxDelay;                               // Max delay in samples.
INT32* prevDelay;                             // Array holding previous delay values.
INT32* currentDelay;                          // Array holding current delay values.
FLOAT32* prevGain;                            // Array holding previous gain values.
FLOAT32* currentGain;                         // Array holding current gain values.
FLOAT32* oldGain;                             // Gain parameter for cross fading of delay.
FLOAT32* newGain;                             // Gain parameter for cross fading of delay.
INT32* fadingDone;                            // State variable to implement cross fading of delay.
INT32* stateIndex;                            // Index of the oldest state variable in the array of state variables.
FLOAT32* state;                               // State variable array.
} ModuleDelayMixerSmoothedClass;

Variables

Properties

Name	Type	Usage	isHidden	Default Value	Range	Units
maxDelayTime	float	const	0	10	0:10	msec
smoothingTimeDelay	float	parameter	0	10	0:1000	msec
smoothingTimeGain	float	parameter	0	10	0:1000	msec
smoothingCoeff	float	derived	1	0.002081	Unrestricted
smoothingCoeffGain	float	derived	1	0.002081	Unrestricted
stateHeap	int	const	1	561	Unrestricted
maxDelay	int	const	1	480	Unrestricted
prevDelay	int*	state	1	[1 x 1]	Unrestricted	samples
currentDelay	int*	state	1	[1 x 1]	Unrestricted	samples
prevGain	float*	state	1	[1 x 1]	Unrestricted	samples
currentGain	float*	state	1	[1 x 1]	Unrestricted	samples
oldGain	float*	state	1	[1 x 1]	Unrestricted
newGain	float*	state	1	[1 x 1]	Unrestricted
fadingDone	int*	state	1	[1 x 1]	0:1
stateIndex	int*	state	1	[1 x 1]	Unrestricted
state	float*	state	1	[1 x 515]	Unrestricted

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


Name	cntrl
Description	Control pin for MxN gain and delays
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	64
Sample rate	48000


Channel Count	1
Block size	32
Sample rate	48000

Matlab Usage

File Name: delay_mixer_smoothed_module.m 
 M=delay_mixer_smoothed_module(NAME, NUMCHANNELS, MAXDELAY, MEMHEAP) 
 Creates a multi-channel time delay in which the delay times are specified 
 in milliseconds. The module has a multichannel input pin 
 and an multichannel output pin. Each output channel is a mix of all the  
 input channels with a dedicated delay and mix level for each input channel.  
 The module applies smooth transition between delay time  
 changes as well as mixer levels. 

 Arguments: 
    NAME - name of the module. 
    NUMCHANNELS - number of output channels for the module. 
    MAXDELAY - maximum delay, 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.