Electronic expression device for producing tremulant effect

Details Electronic expression device for producing tremulant effect Electronic expression device for producing tremulant effect

1973-06-12

1976-03-02

Hix, L. T.

Music

Instruments

G10H 102

Patent

active

039410250

ABSTRACT:
Electronic expression device for producing a novel tremulant effect. The device has a frequency range separator separating an audio frequency signal into a plurality of sub-band signals at least one modulation system being connected to the frequency range separator in order to modulate the sub-band signals other than the lowest sub-band signal, and a coupling means for coupling the output signals of the modulation systems and the lowest sub-band signal. Each of the modulation systems has at least one modulator having a characteristic such that at least the modulation depth increases in accordance with an increase in the frequency of the input signal and the modulation depth exceeds .+-..pi./2 radian for phase modulation and 100 percent for amplitude modulation in a high frequency range.
The audio frequency signal applied to the input terminal is translated in such a manner that frequency spectra of the signal are fluctuating differently with respect to the frequency, phase and amplitude from each other in high frequency ranges corresponding to the sub-band signals except the lowest, but are not fluctuating in the lowest sub-band frequency range.

REFERENCES:
patent: 2835814 (1958-05-01), Dorf
patent: 2916706 (1959-12-01), Timperman
patent: 3004460 (1961-10-01), Wayne
patent: 3007361 (1961-11-01), Wayne
patent: 3146292 (1964-08-01), Bonham
patent: 3418418 (1968-12-01), Wilder
patent: 3516318 (1970-06-01), Wayne
patent: 3524376 (1970-08-01), Heytow

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