Electronic musical instrument with reduced storage of waveform i

Details Electronic musical instrument with reduced storage of waveform i Electronic musical instrument with reduced storage of waveform i

1995-10-26

1998-07-07

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84622, 84623, G10H 100, G10H 102

Patent

active

057772495

ABSTRACT:
An electronic musical instrument comprises an analysis section, an excitation-waveform memory and a synthesis section. In the analysis section, difference data, which are calculated between target-sound data and output of an analysis loop, are subjected to compressive coding to produce compressed data. The compressed data are stored in the excitation-waveform memory as excitation-waveform data. The analysis loop, containing at least a delay circuit, is driven by an excitation signal which is produced by expanding the compressed data. In the synthesis section, the excitation-waveform data, read out from the excitation-waveform memory, are expanded; and expanded data are added to output of a synthesis loop, containing at least a delay circuit, so as to produce musical tone data representative of a musical tone to be generated. By arbitrarily selecting coefficients for compression and expansion which are respectively performed in the analysis section and synthesis section , the musical tone data are controlled to be an equivalence of the target-sound data. Further, the excitation-waveform memory is designed to merely store compressed excitation-waveform data, so capacity required for the memory can be reduced.

REFERENCES:
patent: 4781086 (1988-11-01), Suzuki et al.
patent: 4916996 (1990-04-01), Suzuki et al.
patent: 5416264 (1995-05-01), Toda et al.
patent: 5451707 (1995-09-01), Suzuki
patent: 5461189 (1995-10-01), Higashi et al.

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