Electronic music synthesizer

Details Electronic music synthesizer Electronic music synthesizer

1975-12-29

1977-09-27

Weldon, Ulysses

Music

Instruments

84 124, 84 113, 84 119, 84 126, G10H 100

Patent

active

040503437

ABSTRACT:
An electronic music synthesizer is disclosed in which the sound producing chain includes a voltage-controlled oscillator, band-pass filter, low-pass filter, and amplifier in which selected control currents are supplied to low impedance points within the synthesizer circuit from a resistor matrix. The synthesizer produces sounds approximating different acoustic musical instruments or having different tonal qualities by the application of a predetermined voltage to one of fifteen input columns of the resistor matrix with selected other columns being grounded. The currents provided by the resistor matrix in combination with other externally generated currents control the center frequency and bandwidth of the band-pass filter, the cutoff frequency of the low-pass filter, the gain of the voltage-controlled amplifier, the time constants of transient contour currents used to control the filters and amplifier, and the waveform produced by the voltage-controlled oscillator. Specialized keyboard, waveshaping, contour generating and modulating circuits are also provided.

REFERENCES:
patent: 3549776 (1970-12-01), Shiga et al.
patent: 3787601 (1974-06-01), Campbell
patent: 3828110 (1974-08-01), Colin
patent: 3861263 (1975-01-01), Okudaira

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