Musical tone generating apparatus with reduced data storage requ

Details Musical tone generating apparatus with reduced data storage requ Musical tone generating apparatus with reduced data storage requ

1987-04-13

1990-04-17

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84605, 84607, 84622, 84627, G10H 1057, G10H 106, G10H 700

Patent

active

049169963

ABSTRACT:
A musical tone generating apparatus utilizing a data compression method. A musical tone is sampled and is converted into waveform data. These waveform data are compressed into compressed data by a linear predictive coding method and further by a differential quantization method. The number of bits of each of the compressed data is thus significantly smaller than that of the waveform data. Thereafter, a memory stores the thus compressed data corresponding to an attack portion of the tone and a selected part of a sustain portion of the tone. Hence, it is possible to remarkably reduce the memory storage. When generating a musical tone, the memory reads out the compressed data of the attack portion and thereafter repeatedly reads out the compressed data of the selected part. The read-out compressed data are sequentially decoded into the original digital data. Thus, the whole waveform of the musical tone is reproduced.

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Dodge et al., Computer Music, MacMillan, Inc., N.Y., 1985, pp. 200-220.

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