Patent ID: 8045723
Filing Date: 2011-10-25
Classification: A63G,G10K

Abstract:
1. An active sound effect generating apparatus comprising: a waveform data table for storing one period of waveform data; a rotational frequency detector for detecting the rotational frequency of an engine; a reference signal generator for generating a harmonic reference signal based on said rotational frequency by reading said waveform data successively from said waveform data table; a controller for generating a control signal to generate a sound effect based on said reference signal; an output unit for outputting said sound effect based on said control signal; a rotational frequency change calculator for calculating a rotational frequency change which represents a change per unit time in said rotational frequency; and an engine load detector for detecting a load on the engine; wherein said controller determines an amplitude of said control signal by adjusting an amplitude of said reference signal depending on said rotational frequency change and said load on the engine.