| 摘要 |
PROBLEM TO BE SOLVED: To enhance pleasantness of vehicle drive by deciding musical interval and sound volume according to a detected state of driving state based on extracted music scale data. SOLUTION: The vehicle's driving state is detected by inputting signals to CPU 10 from a revolution sensor 18 and a load sensor 20, and a waveform for one segment is generated and the generated waveform data are outputted to a D/A converter 12. In this case, one segment of the sound waveform in each interval of the scale for every musical instrument is stored, and the revolution speed and the load are continuously measured. The tone waveform of a frequency and a tone color corresponding to timewise variable revolution speed and load changing with time can be obtained from the prestored waveforms by means of arithmetic interpolation. The waveforms obtained by the arithmetic interpolation is outputted from the sound generation means 16. Thus, the interval and the sound volume are decided according to the detected driving state based sound on the extracted music scale data. |
