Overview
Synchronous Granular Synthesis Module Delay
Discussion
This module implements (synchronous) granular synthesis functionality. It uses a delay line to store samples from a real-time input stream. Each grain reads sound from the delay line with a potentially different delay time and playback rate. At instantiation time, you must specify the maximum delay time in milliseconds, max grain size in milliseconds. These values determine the sizes of each internal state buffers to hold audio samples and intermediate results.
...
The module has input pin named panMod that specifies the panning coefficients of the grains at audio rate. Values in the input pin ranges between 0 and 1, the specified value is considered as panning coefficient for left channel. 1-coeff is considered as the panning for right channel.
Type Definition
Code Block |
---|
typedef struct _ModuleGranularSynthesisDelay { ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure INT32 grainSize; // Sets the length of each grain, denoted in milliseconds INT32 grainDensity; // Sets the number of grain samples per second INT32 playDir; // Playback direction, 0=Forward, 1=Backward, 2=Auto (derived from fRatio input pin) FLOAT32 gain; // The peak level of the window INT32 smoothingTime; // Time constant of the pitch smoothing process INT32 maxDelayTime; // Maximum delay, in milliseconds. INT32 windowLength; // Number of coefficients for current window INT32 maxDelaySamples; // Maximum delay in samples. INT32 writeIndex; // Write offset in the delay buffer INT32 maxGrainSize; // Maximum grain size in ms INT32 maxDensity; // Max density in grains per sec FLOAT32 maxRate; // Highest allowed rate of playback that can be specified UINT32 pinID; // Specifies which control pins are available INT32 stateHeap; // Heap in which to allocate state buffer memory. INT32 maxOverlapGrains; // Number of max. overlapping grains per maxGrainSize INT32 grainSizeSamples; // Length of each grain in samples INT32 interonsetTime; // Time between temporally adjacent grain onsets FLOAT32 windowRatio; // Sample ratio of the window coefficients FLOAT32 smoothingCoeff; // Smoothing (pitch) coefficient INT32 grainIndex; // Current used vector index INT32 interonsetCnt; // Current interonset counter FLOAT32 smoothedFRatio; // Current (smoothed) rate at which audio is read from the input buffer FLOAT32* window; // Window coefficients FLOAT32* window_coeffs; // Window coefficients FLOAT32* delayBuffer; // State variable array. INT32* GrainDelayIndex; // Curr delayline index of the intermediate vector element FLOAT32* GrainDelayIndexF; // Curr delayline index fract of the intermediate vector element FLOAT32* GrainDelayFStep; // Curr delayline step size of the intermediate vector element INT32* GrainEnvIndex; // Curr envelope index of the intermediate vector element FLOAT32* GrainEnvIndexF; // Curr envelope index fract of the intermediate vector element FLOAT32* GrainEnvFStep; // Curr envelope step size of the intermediate vector element INT32* GrainOffset; // Curr grain offset of the intermediate vector element FLOAT32* GrainPanCoeff; // Curr panning coefficient of the intermediate vector element INT32* GrainStatus; // Curr status ("active"/"inactive") of the intermediate vector element } ModuleGranularSynthesisDelayClass; |
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
grainSize | int | parameter | 0 | 100 | 1:100 | msec |
grainDensity | int | parameter | 0 | 10 | 1:100 | |
playDir | int | parameter | 0 | 0 | 0:2 | |
gain | float | parameter | 0 | 1 | 0:1 | |
smoothingTime | int | parameter | 0 | 100 | 0:1000 | msec |
maxDelayTime | int | const | 0 | 500 | 0:500 | msec |
windowLength | int | const | 0 | 32 | Unrestricted | |
maxDelaySamples | int | derived | 0 | 24000 | Unrestricted | samples |
writeIndex | int | state | 0 | 0 | Unrestricted | |
maxGrainSize | int | const | 1 | 100 | 0:100 | msec |
maxDensity | int | const | 1 | 100 | 0:100 | grains per sec |
maxRate | float | const | 1 | 5 | Unrestricted | |
pinID | uint | const | 1 | 1 | Unrestricted | |
stateHeap | int | const | 1 | 561 | Unrestricted | |
maxOverlapGrains | int | const | 1 | 10 | Unrestricted | |
grainSizeSamples | int | derived | 1 | 4800 | Unrestricted | |
interonsetTime | int | derived | 1 | 4800 | Unrestricted | |
windowRatio | float | derived | 1 | 1 | Unrestricted | |
smoothingCoeff | float | derived | 1 | 0.006644 | Unrestricted | |
grainIndex | int | state | 1 | 0 | Unrestricted | |
interonsetCnt | int | state | 1 | 0 | Unrestricted | |
smoothedFRatio | float | state | 1 | 1 | Unrestricted | |
window | float* | parameter | 1 | [35 x 1] | Unrestricted | |
window_coeffs | float* | parameter | 0 | [32 x 1] | Unrestricted | |
delayBuffer | float* | state | 1 | [1 x 24003] | Unrestricted | |
GrainDelayIndex | int* | state | 1 | [1 x 10] | Unrestricted | |
GrainDelayIndexF | float* | state | 1 | [1 x 10] | Unrestricted | |
GrainDelayFStep | float* | state | 1 | [1 x 10] | Unrestricted | |
GrainEnvIndex | int* | state | 1 | [1 x 10] | Unrestricted | |
GrainEnvIndexF | float* | state | 1 | [1 x 10] | Unrestricted | |
GrainEnvFStep | float* | state | 1 | [1 x 10] | Unrestricted | |
GrainOffset | int* | state | 1 | [1 x 10] | Unrestricted | |
GrainPanCoeff | float* | state | 1 | [1 x 10] | Unrestricted | |
GrainStatus | int* | state | 1 | [1 x 10] | Unrestricted |
Pins
Input Pins
Name: in
Description: Input audio
...
Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: audio
Description: Output data
Data type: float
Scratch Pins
Channel count: 1
Block size: 32
...
Block size: 32
Sample rate: 48000
MATLAB Usage
File Name: granular_synthesis_delay_module.m