Patent ID: 9401683
Filing Date: 2016-07-26
CPC Classification: G10K,H03G,H04R

Claim Text:
1. A vehicular active sound effect generating apparatus comprising: a waveform data table for storing waveform data of one period; a rotational frequency detecting unit for detecting a rotational frequency of an engine of a vehicle; a reference signal generating unit for generating a harmonic reference signal based on the rotational frequency by reading the waveform data from the waveform data table; a control signal generating unit for generating a control signal to generate a sound effect to be output into a passenger compartment of the vehicle, based on the reference signal; an accelerator opening detecting unit for detecting an accelerator opening of the vehicle; an amplitude-adjusted control signal generating unit for generating an amplitude-adjusted control signal by adjusting an amplitude of the control signal depending on the accelerator opening; a plurality of speakers for outputting the sound effect based on the amplitude-adjusted control signal; wherein the speakers include a front speaker positioned in a front portion of the vehicle and a rear speaker positioned in a rear portion of the vehicle; and a delay unit for giving a delay to a sound effect output from the rear speaker, such that the sound effect output from the rear speaker is delayed in comparison with a sound effect output from the front speaker, depending on both an accelerator opening change which represents a change per unit time in the accelerator opening and the accelerator opening itself, wherein the delay unit changes an amount of the delay given to the sound effect output from the rear speaker, depending on a magnitude of the accelerator opening change and the accelerator opening itself so as to reflect an operation of an accelerator pedal in the amount of the delay.