Dynamic Engine Harmonic Enhancement Sound Stage

摘要

A method to produce a dynamic sound stage for engine harmonic enhancement (EHE). Dynamic refers to the ability to position the sound stage at different positions as the engine operates at various RPMs and load. In order to control the sound stage width, a phase difference can be introduced between a first audio channel (e.g., a left audio channel) and second audio channel (e.g., a right audio channel). In the most general case, the phase difference can be introduced per harmonic per RPM. In this approach, the phase difference can be adjusted such that a vehicle occupant will perceive each harmonic signal to have a particular width. This width can be adjusted independently per RPM regions by tuning the per harmonic phase difference.

主权项

1. A method, comprising:
providing a fundamental frequency corresponding to the RPM of an engine of a vehicle; determining a plurality of harmonics of the fundamental frequency; determining a plurality of first gain values, the plurality of first gain values comprising, for each harmonic of the plurality of harmonics, a first gain value as a function of RPM; determining a plurality of first phase values, the plurality of first phase values comprising, for each harmonic of the plurality of harmonics, a first phase value as a function of RPM; combining the plurality of harmonics, the plurality of first gain values, and the plurality of first phase values to produce a first set of harmonic enhancement signals; combining the harmonic enhancement signals of the first set to provide a first channel harmonic enhancement signal; determining a plurality of second gain values, the plurality of second gain values comprising, for each harmonic of the plurality of harmonics, a second gain value as a function of RPM; determining a plurality of second phase values, the plurality of second phase values comprising, for each harmonic of the plurality of harmonics, a second phase value as a function of RPM; combining the plurality of harmonics, the plurality of second gain values, and the plurality of second phase values to produce a second set of harmonic enhancement signals; and combining the harmonic enhancement signals of the second set to provide a second channel harmonic enhancement signal, wherein a per harmonic phase difference between the plurality of first phase values and the plurality of second phase values varies as a function of the engine RPM.