(57) A device for electronically simulating vibrato and tremulant effects and the radiation
effects produced by a rotary loudspeaker with the aid of two loudspeakers, (34, 50),
in which a musical tone signal (20) is applied to a variable delay device (22) associated
with one of the loudspeakers (34). The frequency modulated signal (B) produced by
the variable delay device is also subjected to amplitude modulation in a modulator
(40) controlled in synchronism with the variable delay device, and the resulting composite
signal applied to the other loudspeaker (50). Additionally, the high frequency components
of the frequency modulated signal from the variable delay device may be summed in
an amplifier (46), in an out of phase relationship, with the composite amplitude modulated
signal (C) to simulate the effect of a rotating high frequency horn radiator. The
sub-audio modulating signal, which may be for example at 1Hz for a «chorus» effect,
or 7Hz for a tremulant effect, is produced by an oscillator (26), and the degree of
amplitude- and/or frequency-modulation may be dependant on this sub-audio frequency.
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