Music – Instruments
Patent
1980-07-14
1985-01-29
Witkowski, Stanley J.
Music
Instruments
84 124, 84DIG10, G10H 700
Patent
active
044958463
ABSTRACT:
An electronic musical instrument is provided in which frequency signals are developed by voltage controlled oscillators which are controlled from an analog demultiplexer connected to a scanner of a keyboard and control circuit and in which envelope signals are developed by an envelope synthesizer in synchronized relation to the frequency signals, such frequency and envelope signals being applied to a waveform synthesizer circuit to develop output signals for production of tones. The keyboard and control circuit includes available oscillator and keyboard memories operable from a memory interchange circuit and further includes circuitry for accommodating overload, re-key and an optional portamento operation which is polyphonic in that the frequencies of a plurality of tones can be simultaneously and continuously changed. The circuitry also provides an infinite duration release capability. The envelope synthesizer cooperates with the keyboard and control circuit in such operation and is readily adjusted to obtain desired envelope characteristics. The waveform synthesizer includes analog multiplexer means controlled from a plurality of voltage levels which may preferably be established by potentiometers having linearly movable controls.
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