Patent ID: 7787633

Claim:
A vehicle engine sound simulator, comprising: a crossfade sample playback engine which produces an output waveform comprising at least two constituent waveforms which are transposed up and down in frequency as a function of RPM and which are mixed together, the proportions of each constituent waveform in said output waveform varying with an input representative of the RPM of a vehicle engine, a load gain circuit which produces a “computed load value” output as a function of the rate of change of said RPM, an external load value, and/or a combination of both, and a digital signal processing (DSP) circuit which receives said output waveform from said crossfade sample playback engine and processes said output with a function that varies with said computed load value, the output of said DSP circuit being the output of said vehicle engine sound simulator, wherein each of said constituent waveforms is associated with a respective range of RPM values, each of which has a center RPM value, and each RPM range is associated with at least two constituent waveforms, said output waveform crossfaded between the constituent waveforms associated with the range in which a given RPM value falls, the amplitude of each constituent waveform in said output waveform varying with the proximity of said given RPM value to each waveform's center RPM value.