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.
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