Polyphonic tone synthesizer

Details Polyphonic tone synthesizer Polyphonic tone synthesizer

1975-08-11

1978-04-25

Jackmon, Edith S.

Music

Instruments

84 103, G10H 100, G10F 100

Patent

active

040856445

ABSTRACT:
Musical notes are produced polyphonically in a tone synthesizer or like musical instrument by computing a master data set, transferring data set to buffer memories, and repetitively converting in real time contents of memories to notes. The master data set is created repetitively and independently of tone generation by computing a generalized Fourier algorithm using stored sets of generalized Fourier coefficients. Computations limit tones to audible frequencies, occur at intervals short compared to musical tone periods, and circuitry is included to provide time-varying modulations of the synthesized tonal structure. Synchronizing signals included in the buffer memories provide smooth transition between the master system logic clock and asynchronous tone conversion clocks. A time shared digital-to-analog converter transforms the buffer memory outputs to individual tone channels and provides attack, decay, sustain, release and other amplitude modulation effects.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3733593 (1973-05-01), Moinar
patent: 3809786 (1974-05-01), Deutsch
patent: 3809788 (1974-05-01), Deutsch
patent: 3894463 (1975-07-01), Rocheleau

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