Phase-modulating system for electronic musical instruments

Details Phase-modulating system for electronic musical instruments Phase-modulating system for electronic musical instruments

1980-12-22

1982-10-19

Witkowski, Stanley J.

Music

Instruments

84 125, 84DIG4, 179 1J, G10H 1043

Patent

active

043544150

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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Verzogerung von Nf-Signalen mit MOS-Eimerketten by Hollman et al., pp. 967-970, 1009, & 1010.

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