Device for modulating a musical tone signal to produce a rotatin

Details Device for modulating a musical tone signal to produce a rotatin Device for modulating a musical tone signal to produce a rotatin

1975-11-20

1977-02-22

Jackmon, E. S.

Music

Instruments

84DIG1, 179 1J, G10H 102, H04M 100

Patent

active

040086410

ABSTRACT:
A device for modulating a musical tone signal to produce a rotating sound effect. A first channel is coupled to an input for a musical tone and has an amplitude modulator therein. At least two further channels each having an amplitude modular therein are coupled to the input through a delay circuit. A frequency modulator is coupled to the amplitude modulator in the first channel and to the delay circuit means for frequency modulating the musical tone signals therein and phase shifters are coupled between the frequency modulator and the respective amplitude modulators in the further channels for shifting the phase of the musical tone signal in the channels. The outputs of the amplitude modulators are coupled acoustically or electrically for converting the modulated musical tone signals into sound, with the musical tone signal from said first channel being in the center of the reproduced sound and the musical tone signals from the further channels being on opposite sides of the musical tone signal from the first channel. The frequency modulator, amplitude modulators and phase shifters modulate the signals in the further channels so that when the volume level in one channel is a maximum the volume level in the other channel is a mimimum and vice versa and when the volume level in one channel is a maximum the modulated frequency is substantially a maximum and when the volume level in the other channel is a maximum the modulated frequency is substantially a minimum, and when the volume levels of the signals in the other channels are about equal the volume level and frequency of the signal in the first channel is successively a maximum and a minimum, whereby a rotating sound effect is produced.

REFERENCES:
patent: 3229019 (1966-01-01), Peterson
patent: 3255297 (1966-06-01), Long
patent: 3886835 (1975-06-01), Peterson

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