Musical tone generating apparatus

Details Musical tone generating apparatus Musical tone generating apparatus

1985-10-04

1988-11-01

Witkowski, S. J.

Music

Instruments

84 122, 84 128, 364723, G10H 106, G10H 700

Patent

active

047810963

ABSTRACT:
A musical tone generating apparatus for an electronic musical instrument utilizing a data compression system is disclosed. This musical tone generating apparatus is basically constructed by a memory storing difference data and a data reproduction circuit. The difference data is in advance obtained by converting a musical tone signal to be reproduced to digital sample data, effecting a linear prediction operation on the digital sample data to produce prediction data and calculating the difference between the digital sample data and the prediction data. The stored difference data are sequentially read from the memory. In the data reproduction circuit, the musical tone signal is reproduced by effecting a reverse operation of the linear prediction operation on the read difference data. In the case where the musical tone signal is a periodic signal, the efficiency of the data compression is further enhanced by subtracting from each difference data to be stored in the memory that difference data which was generated one period of the musical tone signal before the generation of the each difference data. The efficiency of the data compression is more further enhanced by subtracting from each difference data that difference data which was generated a predetermined number of sampling intervals before the generation of the each difference data.

REFERENCES:
patent: 4133241 (1979-01-01), Niimi et al.
patent: 4137810 (1979-02-01), Wheelwright et al.
patent: 4435831 (1984-03-01), Mozer
patent: 4484507 (1984-11-01), Nakaja et al.
patent: 4536853 (1985-08-01), Kawamoto
patent: 4611522 (1986-09-01), Suzuki
patent: 4641564 (1987-02-01), Okamoto
"Musical Sound Synthesis by Forward Differences" by Yasuhiro Mitsuhashi, 8013 Journal of the Audio Engineering Society, vol. 30(1982) Jan.-Feb., No. 1/2, New York, U.S.A.

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