Apparatus and method for generating chorus and celeste tones

Details Apparatus and method for generating chorus and celeste tones Apparatus and method for generating chorus and celeste tones

1979-05-29

1981-07-28

Truhe, J. V.

Music

Instruments

84DIG4, G10H 102

Patent

active

042803888

ABSTRACT:
The operation of the chorus generator of FIG. 3 may be summarized as follows. The generation of a realistic chorus tone depends upon the simultaneous amplitude and phase modulation of a tone signal which initially has little or no choral characteristics. When a tone signal generator is so modulated, the derived audio tone from a loudspeaker will exhibit choral characteristics. A random low frequency signal generator serves as an input to both the amplitude and phase modulation channels. The amplitude modulation signal is merely a suitably delayed replica of the low frequency signal. The phase modulation signal is derived from the low frequency signal by first modifying its amplitude excursions by means of a function generator and then filtering the derived signal by means of a suitable non-minimum phase shift filter.

REFERENCES:
patent: 3007361 (1961-11-01), Wayne
patent: 4038898 (1977-08-01), Kniepkamp et al.
patent: 4043243 (1977-08-01), Peterson
patent: 4078466 (1978-03-01), Suenaga et al.
patent: 4080861 (1978-03-01), Wholahan
patent: 4160402 (1979-07-01), Schwartz

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