Overview
Synchronous Granular Synthesis Module Wave RAM
Discussion
This module implements (synchronous) granular synthesis functionality. The module reads data directly from the embedded wave file and performs granular synthesis.
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This module uses 16-bit WAV samples and 16-bit internal math for speed.
Type Definition
Code Block |
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typedef struct _ModuleGranularSynthesisWaveRAM { 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 windowLength; // Number of coefficients for current window INT32 waveLength; // Number of samples in currently loaded file INT32 maxGrainSize; // Maximum grain size in ms INT32 maxDensity; // Max density in grains per sec FLOAT32 normRate; // Rate of data used to compute the ratio for normalized players FLOAT32 maxRate; // Highest allowed rate of playback that can be specified UINT32 pinID; // Specifies which control pins are available 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 waveRatio; // Sample ratio of the wave samples FLOAT32 windowRatio; // Sample ratio of the window coefficients INT32 waveSampleRate; // Actual sample rate of the wave file. INT32 waveNumChannels; // Number of channels in the wave file. FLOAT32 scaleFactor; // Scale factor for playback rate 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* waveBuffer; // Data transferred from PC to target DSP via this buffer FLOAT32* window; // Window coefficients FLOAT32* window_coeffs; // Window coefficients INT32* GrainWavIndex; // Curr wave index of the intermediate vector element FLOAT32* GrainWavIndexF; // Curr wave index fract of the intermediate vector element FLOAT32* GrainWavFStep; // Curr wave 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 } ModuleGranularSynthesisWaveRAMClass; |
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 |
windowLength | int | const | 0 | 32 | Unrestricted | |
waveLength | int | derived | 0 | 8976 | Unrestricted | |
maxGrainSize | int | const | 1 | 100 | 0:100 | msec |
maxDensity | int | const | 1 | 100 | 0:100 | grains per sec |
normRate | float | const | 1 | 1 | Unrestricted | |
maxRate | float | const | 1 | 5 | Unrestricted | |
pinID | uint | const | 1 | 1 | Unrestricted | |
maxOverlapGrains | int | const | 1 | 10 | Unrestricted | |
grainSizeSamples | int | derived | 1 | 4800 | Unrestricted | |
interonsetTime | int | derived | 1 | 4800 | Unrestricted | |
waveRatio | float | derived | 1 | 1 | Unrestricted | |
windowRatio | float | derived | 1 | 1 | Unrestricted | |
waveSampleRate | int | derived | 1 | 48000 | Unrestricted | |
waveNumChannels | int | derived | 1 | 1 | Unrestricted | |
scaleFactor | float | derived | 1 | 1 | Unrestricted | |
smoothingCoeff | float | derived | 1 | 0.05194 | Unrestricted | |
grainIndex | int | state | 1 | 0 | Unrestricted | |
interonsetCnt | int | state | 1 | 0 | Unrestricted | |
smoothedFRatio | float | state | 1 | 1 | Unrestricted | |
waveBuffer | float* | parameter | 1 | [8979 x 1] | Unrestricted | |
window | float* | parameter | 1 | [35 x 1] | Unrestricted | |
window_coeffs | float* | parameter | 0 | [32 x 1] | Unrestricted | |
GrainWavIndex | int* | state | 1 | [1 x 10] | Unrestricted | |
GrainWavIndexF | float* | state | 1 | [1 x 10] | Unrestricted | |
GrainWavFStep | 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: fRatio
Description: Specifies playback ratio
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Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: audio
Description: Output data
Data type: float
Scratch Pins
Channel count: 1
Block size: 256
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Block size: 256
Sample rate: 48000
MATLAB Usage
File Name: granular_synthesis_wave_ram_module.m