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.
1. Run the simulation. Listen to the engine sound output from the Wavetable Synthesizer.
2. Tune the RPM source to adjust the perceived RPM of the generated engine sound. The RPM source is lowpass smoothed using a Biquad filter, so that the engine sound ramps in a realistic fashion. Visualize the RPM source before and after smoothing on a Scope.
3. The tuning factor can be used to increase or decrease the overall range of output frequencies. This is used because the wavetable sample RPM is unknown and the sound range might require calibration.