Engine sound management

摘要

In a vehicle equipped with a vehicle sound system, determining a virtual fixed gear ratio; determining a virtual RPM based on the virtual fixed gear ratio; generating a set of harmonic signals based on the virtual RPM, the harmonic signals being sine-wave signals proportional to harmonics of the virtual RPM; processing the harmonic signals to produce a set of processed harmonic signals; and in the vehicle sound system, transducing the processed harmonic signals to acoustic energy thereby to produce an engine sound within a passenger cabin of the vehicle.

主权项

1. A method comprising:
in a vehicle equipped with a vehicle sound system and a continuously variable transmission, determining a virtual fixed gear ratio; determining a virtual RPM based on the virtual fixed gear ratio,
wherein the virtual fixed gear ratio is determined based on a current gear ratio of the continuously variable transmission which varies continuously in time as a function of an actual, measured RPM and vehicle speed, andwherein the virtual RPM changes with the vehicle speed when the actual RPM remains constant; generating a set of harmonic signals based on the virtual RPM, the harmonic signals being sine-wave signals proportional to harmonics of the virtual RPM; processing the harmonic signals to produce a set of processed harmonic signals; and in the vehicle sound system, transducing the processed harmonic signals to acoustic energy thereby to produce an engine sound within a passenger cabin of the vehicle.