Wavetable Synthesizer

Generate periodic signal from single-cycle waveforms

• 

Libraries:
Audio Toolbox / Sources

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.

Examples

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.

• Open Model

Ports

Input

WT — Single-cycle waveform

vector of real values

Dependencies

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

Data Types: single | double

F — Output wave frequency (Hz)

nonnegative scalar | vector of nonnegative values

Dependencies

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

Data Types: single | double

A — Output wave amplitude

nonnegative scalar

Dependencies

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

Data Types: single | double

DC — Output wave DC offset

scalar

Dependencies

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

Data Types: single | double

Output

Port_1 — Output signal

vector | matrix

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

Data Types: single | double

Parameters

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

Single-cycle waveform — Wavetable

sin(2*pi*(0:511)/512) (default) | vector of real values

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

Output wave frequency (Hz) — Frequency of generated signal

100 (default) | nonnegative scalar

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

Output wave amplitude — Amplitude of generated signal

1 (default) | nonnegative scalar

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

Output wave phase offset — Normalized phase offset of generated signal

0 (default) | scalar in the range [0,1]

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

Output wave DC offset — Value added to each element of generated signal

0 (default) | scalar

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

Tunable: Yes

Samples per frame — Number of samples per frame output from block

512 (default) | positive integer scalar

Number of samples per frame output from block, specified as a positive integer scalar.

Tunable: No

Sample rate (Hz) — Sample rate of generated signal

44100 (default) | positive scalar

Sample rate of generated signal, specified as a positive scalar.

Tunable: No

Output data type — Data type of generated signal

double (default) | single

Data type of generated signal, specified as double or single.

Tunable: No

Simulate using — Specify type of simulation to run

Code generation (default) | Interpreted execution

• 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.

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™.

Version History

Introduced in R2020a