Electronic musical instrument by digitally calculating harmonics

Details Electronic musical instrument by digitally calculating harmonics Electronic musical instrument by digitally calculating harmonics

1977-10-18

1979-01-02

Schaefer, Robert K.

Music

Instruments

84 122, 84 119, G10H 502

Patent

active

041321405

ABSTRACT:
In an electronic musical instrument, the amplitudes of respective partial components constituting a composite waveshape at successive sample points are produced, these amplitudes are multiplied, at regular time intervals individually by coefficients each being associated with corresponding partial components to obtain the amplitudes weighted, these weighted amplitudes being accumulated successively to obtain the net amplitudes weighted of the composite waveshape for each sample point. The net amplitudes are converted to a musical sound by sounding means. The coefficients are repetitively calculated at another regular time intervals, each of which being longer than the foregoing regular time interval, by implementing the algorithm of a certain function of time, as the multiplications are carried out.
This instrument is capable of producing a musical sound whose tonal quality will change with the lapse of time in accordance with a certain function of time, without employing an expensive high-speed calculating device which will increase the cost of the instrument.

REFERENCES:
patent: 3809786 (1974-05-01), Deutsch
patent: 3823390 (1974-07-01), Tomisawa
patent: 3913442 (1975-10-01), Deutsch
patent: 3992971 (1976-11-01), Chibana
patent: 4036096 (1977-07-01), Tomisawa
patent: 4083285 (1978-04-01), Chibana

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