Patent
Electronic sound synthesizer
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TLDR
In this article, the frequency data of both a fundamental wave and a modulated wave are stored in a RAM as 6-bit digital data, and the digital data read out from the RAM is converted to an analog sound signal by a D/A converter.Abstract:
An electronic source synthesizer that employs frequency modulation. Wave-form data of both a fundamental wave and a modulated wave are stored in a RAM as 6-bit digital data. A sine wave signal is produced by modulation wave frequency data and the wave-form data from the RAM. The sine wave signal is multiplied with amplitude data of the modulation wave to obtain the modulation index data (J(t)). The frequency data (w c ) of the fundamental wave and the modulation index data are multiplied. A result of the multiplication provides a read out address of the RAM for storing the wave-form data of the fundamental wave, thereby changing the read out speed of the RAM. The digital data read out from the RAM is converted to an analog sound signal by a D/A converter. Amplitude data (A) of the fundamental wave is pulse-width modulated, and the digital data from the RAM is gated by the modulated pulse. Thus the output of the D/A converter is activated and, forms a sound signal represented by the equation e=A sin J(t) w c t.read more
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Journal ArticleDOI
Electronic musical instrument
Nagai Youhei,Okamoto Shimaji +1 more
TL;DR: In this article, the tone signal generated by one of the tone generators is passed through a frequency shifter, while the tone generated by the rest of the keyers is not, and then the two signals are mixed together and finally transduced into sound by a loudspeaker.
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Electronic musical instrument
TL;DR: In this article, the electronic musical instrument which provides both a musical instrument performance and a scale name performance by using the same music data is provided, where the electronic music instrument is equipped with music data 11, a scale named sounding part 111, a note-ON read and assignment part 12 which reads note-OFF data out of the music data and assigns the data to the scale name sounding part 11 and a note off read part 13 which reads off data out from the music dataset.