Phase-modulating system for electronic musical instruments
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United States of America Patent
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Oct 19, 1982
Grant Date -
N/A
app pub date -
Dec 22, 1980
filing date -
Dec 22, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electronic musical instrument comprises a sound generator connected to a loudspeaker by way of several parallel channels including respective delay lines constituted by charge-transfer devices of the bucket-brigade type stepped by different high-frequency pulse generators. Each pulse generator comprises a voltage-controlled oscillator whose output frequency is varied by a composite periodic signal obtained from a respective stage of a chain of operational amplifiers each provided, except possibly for the first stage, with an RC network acting as a frequency-dependent phase shifter for a nonsinusoidal modulating signal consisting of at least two sub-audio-frequency components. The modulating signal may be synthesized from a plurality of stepped waveforms generated by the concurrent readout, at different sampling rates, of a set of amplitude values stored in a read-only memory.
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