Waveform producing system

Details Waveform producing system Waveform producing system

1975-03-10

1978-08-22

Clawson, Jr., Joseph E.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307225R, 307271, 328 14, 328178, H03B 1900

Patent

active

041092082

ABSTRACT:
In a waveform producing system for use in, for example, an electronic musical instrument, a tone generator circuit and/or a tone control circuit including tone keyer circuits, each or either one of said tone generator circuit and said tone control circuit comprises: pulse generators associated with key-actuated switches, respectively; waveform memorizing means having at least one row of voltage dividers of which the division ratios are preset in characteristics corresponding to either the tone waveforms, the tone envelopes or the depression speeds of the key operated by the player of the instrument; sequential memory read-out means connected to the respective voltage dividers; and pulse generators thereby providing an enabling signal sequentially to the individual dividers every time a pulse is inputted from the pulse generators to read-out the memorized waveform in the form of a modified audio signal at the output side of the circuit. The memorized waveforms can arbitrarily be sampled (scanned) out by using a sampling circuit in the read-out means, thereby providing variations in the modified audio signal. The tone control circuit enables the tone level control in conformity to the depression speed of the key and tone envelope control without the need to employ the conventional charge-discharge circuit requiring a relatively large capacitance capacitor, and makes it easy to carry out circuit integration.

REFERENCES:
patent: 3204034 (1965-08-01), Ballard et al.
patent: 3548372 (1970-12-01), Yonezu
patent: 3609560 (1971-09-01), Greenberg
patent: 3617726 (1971-11-01), Uchida et al.
patent: 3654450 (1972-04-01), Webb
patent: 3689914 (1972-09-01), Butler
patent: 3701027 (1972-10-01), Belton
patent: 3702441 (1972-11-01), Thrower
patent: 3752973 (1973-08-01), Thorn et al.
patent: 3765015 (1973-10-01), Gruner

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