Music – Instruments – Electrical musical tone generation
Patent
1988-09-28
1990-02-27
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84627, 84633, G10H 1057, G10H 106, G10H 146, G10H 700
Patent
active
049035649
ABSTRACT:
In a musical tone waveform producing apparatus having an operating device for receiving an instruction from a user, a waveform memory, a waveform control circuit for reading out tone-color waveform data from the waveform memory, an envelope memory, an envelope control circuit for reading out the envelope data from the envelope memory, and a multiplier for producing a resultant waveform, tone-color waveform data formed of a number of waveform data blocks each having an attenuation flag is prestored in the waveform memory and the attenuation flag is received by the envelope control circuit to produce attenuated envelope data while the attenuation flag is valid and to output the envelope data read out of the envelope memory while the attenuation flag is invalid. As a result, the resultant waveform has no undesirable noise component caused by the following tone-color waveform data.
REFERENCES:
patent: 4524668 (1985-06-01), Tomisawa et al.
patent: 4528885 (1985-07-01), Chihana
patent: 4616546 (1986-10-01), Uchiyama et al.
patent: 4726276 (1988-02-01), Katoh et al.
Hatanaka Masahiko
Mori Daisuke
Nakanishi Masahiro
Matsushita Electric - Industrial Co., Ltd.
Witkowski Stanley J.
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