Electronic tremolo effect producing device

Claim 1

An electronic tremolo-effect producing device, producing a tremolo effect by mixing a musical sound signal with a frequencydeviated musical signal, comprising: a tone generator to generate musical sound signals; a first tone coloring circuit connected to said tone generator for effecting tone coloring of a selected musical sound signal from said tone generator; a modulating circuit connected to receive the tone-colored selected signal from said first tone coloring circuit and comprising a low frequency oscillator generating a low frequency carrier signal and a modulator connected thereto and giving out a modulated signal; a filter means connected to said modulator for eliminating said low frequency carrier signal from the modulated signal and for giving an output which is selectively deviated on higher and lower sides of the selected signal frequency to the extent of the frequency of said low frequency oscillator; a second tone coloring circit connected to said modulating cirCuit to receive said output from said filter means, said second tone coloring circuit including a variable filter circuit having a control input receiving the low frequency signal, wherein the value of the variable filter circuit varies in response to variations of said low frequency signal; and a signal mixing means connected to said first and second tone coloring circuits to mix at a predetermined level said frequency deviated signal which is tone-colored and said tonecolored selected musical sound signal, to obtain a tremolo effect.