Wave synthesizing apparatus

Details Wave synthesizing apparatus Wave synthesizing apparatus

1982-09-17

1983-11-22

Isen, F. W.

Music

Instruments

84 101, G10H 106

Patent

active

044161808

ABSTRACT:
A waveform synthesizing apparatus is provided for producing a desired synthesized waveform by adding partial waveforms together. In this apparatus, the times within a cycle wherein a fundamental and harmonics of a desired wave to be output are stored in the circuitry. Peak values of each partial waveform are formed at the prestored times and output at frequencies, which correspond to or exceed sampling frequencies required by each partial waveform. These partial outputs are fed to low pass filters. Each filter has a cut-off frequency component corresponding to each of the output frequencies to remove therefrom clock components. Outputs of the low-pass filters are added together to obtain a synthesized waveform.

REFERENCES:
patent: 3888153 (1975-06-01), Deutsch
patent: 4215614 (1980-08-01), Chibana
patent: 4238984 (1980-12-01), Watanabe
patent: 4256004 (1981-03-01), Takeuchi
patent: 4262573 (1981-04-01), Chibana
patent: 4279186 (1981-07-01), Deforeit

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