Music – Instruments – Electrical musical tone generation
Patent
1989-12-27
1992-11-17
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84659, 84663, 84694, 84DIG27, G10H 1057, G10H 114
Patent
active
051645300
ABSTRACT:
A musical sound waveform generator includes a carrier signal generating unit, a modulation signal generating unit, a mixing controlling unit and a waveform outputting unit. The characteristics of the carrier signal from the carrier signal generating unit are determined such that the musical sound waveform generated by the waveform outputting unit is a sine wave or a cosine wave with a single frequency, where the mixing ratio of the modulation signal is made 0 by the mixing controlling unit. Therefore, the mixing controlling unit presets the mixing ratio of the modulation signal to be 0, making it possible to generate a musical sound waveform which is only a sine wave or a cosine wave of a single frequency. During the performance, the mixing ratio can, for example, be determined at a high value immediately after the start of sound generation and thereafter reduced to near 0 with time. Thereby, the frequency characteristics of the musical sound waveform can be controlled such that the musical sound waveform is changed from one having a lot of higher harmonics to one having only a single sine wave component or a single cosine wave component.
REFERENCES:
patent: 4018121 (1977-04-01), Chowning
patent: 4144790 (1979-03-01), Suchoff
patent: 4249447 (1981-02-01), Tomisawa
patent: 4297933 (1981-11-01), Nishimoto
patent: 4329902 (1982-05-01), Love
patent: 4554857 (1985-11-01), Nishimoto
patent: 4643066 (1987-02-01), Oya
patent: 4748888 (1988-06-01), Oya
patent: 4924744 (1990-05-01), Yamamura
Casio Computer Co. Ltd.
Witkowski Stanley J.
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