Wavetable Synthesizer

Generate periodic signal from single-cycle waveforms

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  • Library:

  • Audio Toolbox / Sources

  • Wavetable Synthesizer block

Description

The Wavetable Synthesizer block generates a periodic signal with tunable parameters. The periodic signal is defined by a single-cycle waveform cached as the Single-cycle waveform parameter of your Wavetable Synthesizer block.

The Wavetable Synthesizer block enables you to output a repeated single-cycle waveform while tuning aspects of the single-cycle waveform, such as frequency, amplitude, and offset.

Ports

Input

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Dependencies

To enable this port, select Specify wavetable from input port for the Single-cycle waveform parameter.

Data Types: single | double

Dependencies

To enable this port, select Specify frequency from input port for the Output wave frequency (Hz) parameter.

Data Types: single | double

Dependencies

To enable this port, select Specify amplitude from input port for the Output wave amplitude parameter.

Data Types: single | double

Dependencies

To enable this port, select Specify DC offset from input port for the Output wave DC offset parameter.

Data Types: single | double

Output

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The Wavetable Synthesizer block outputs a periodic signal defined by the parameters of the block.

Data Types: single | double

Parameters

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If a parameter is listed as tunable, then you can change its value during simulation.

The Wavetable Synthesizer block indexes into the single-cycle waveform to synthesize a periodic wave.

To specify Single-cycle waveform from an input port, select Specify wavetable from input port for the parameter.

Tunable: Yes

The number of times the single-cycle waveform is repeated in one second.

To specify Output wave frequency (Hz) from an input port, select Specify frequency from input port for the parameter.

Tunable: Yes

Amplitude scaling is applied before DC offset.

To specify Output wave amplitude from an input port, select Specify amplitude from input port for the parameter.

Tunable: Yes

The phase offset range, [0,1], corresponds to a normalized 2π radians interval.

To specify Output wave DC offset from an input port, select Specify DC offset from input port for the parameter.

Tunable: Yes

  • Code generation – Simulate the model using generated C code. The first time you run a simulation, Simulink® generates C code for the block. The C code is reused for subsequent simulations, as long as the model does not change. This option requires additional startup time, but the speed of the subsequent simulations is comparable to Interpreted execution.

  • Interpreted execution – Simulate the model using the MATLAB® interpreter. This option reduces startup time and the simulation speed is comparable to Code generation. In this mode, you can debug the source code of the block.

Model Examples

Model Engine Noise

Model Engine Noise

In this model, the Wavetable Synthesizer block is used to synthesize realistic engine noise. Such a system may be found in a vehicle where artificial engine noise enhancement is desired. The wavetable sample is a real-world engine recorded at an unspecified RPM.

Block Characteristics

Data Types

double | single

Direct Feedthrough

no

Multidimensional Signals

no

Variable-Size Signals

no

Zero-Crossing Detection

no

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

See Also

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Introduced in R2020a

Audio Toolbox Documentation

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