Active sound effect generating apparatus
First Claim
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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.
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Abstract
An active sound effect generating apparatus includes a controller (a fourth acoustic adjuster and a fifth acoustic adjuster) which determines the amplitude of a control signal by adjusting the amplitudes of reference signals (intermediate signals) depending on an engine rotational frequency change [Hz/second] calculated by an engine rotational frequency change calculator and an accelerator opening [%] detected by an accelerator opening sensor.
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Citations
8 Claims
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1. An active sound effect generating apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification