Reverberation tone generating apparatus

DETAILED DESCRIPTION Accordingly, it is an object of this invention to provide a novel reverberation tone generating apparatus capable of producing a reverberation tone rich in naturality with a small and economical circuit construction.
Another object of this invention is to obtain a reverberation tone generating apparatus capable of producing a high quality reverberation tone and in which S/N ratio does not lower even when the reverberation tone time is elongated.
Briefly stated according to this invention apparatus for generating a reverberation tone whose delay time and level vary irregularly is combined with apparatus having a feedback loop of an output delayed signal for producing a reverberation tone regularly.
According to this invention, there is provided a reverberation tone generating apparatus comprising a first delay circuit which delays an input musical tone signal for different delay times to produce a plurality of delayed musical tone signals, a level control circuit for independently controlling levels of the plurality of delayed musical tone signals, a second delay circuit having a feedback loop for feeding back an output signal of the second delay circuit to an input side thereof, the second delay circuit synthesizing an input musical tone signal and a delayed output signal thereof at a predetermined ratio and delaying a signal thus synthesized for a predetermined time, and means for synthesizing an output signal of the level control circuit and an output signal of the second delay circuit for outputting a synthesized signal as a reverberation tone signal of the input musical tone signal.