Patent ID: 9437185
Filing Date: 2016-09-06
CPC Classification: B60Q,G10K,Y10S

Claim Text:
1. An active sound effect generating apparatus comprising: a waveform data table that stores a waveform data corresponding to one waveform period; a vehicle speed detecting unit that detects a vehicle speed; a frequency setting unit that sets a vehicle-speed-corresponding frequency, which is a frequency defined on the basis of the vehicle speed detected by the vehicle speed detecting unit; a reference signal generating unit that generates a reference signal having a harmonic in accordance with the vehicle-speed-corresponding frequency by sequentially reading the waveform data from the waveform data table; a control signal generating unit that generates a control signal used for generation of a sound effect on the basis of the reference signal; an output unit that outputs the control signal as the sound effect; an amount-of-change-in-frequency calculating unit that calculates an amount of change in frequency, which is a time differential value of the vehicle-speed-corresponding frequency; and a driving source load detecting unit that detects a load of a driving source of a vehicle, wherein the control signal generating unit adjusts an amplitude of the control signal by varying an amplitude of the reference signal in accordance with the amount of change in frequency and the load of the driving source.