Electronic musical instrument with frequency modulation of a tone signal with an audible frequency signal
First Claim
1. An electronic musical instrument comprising:
- keyboard circuit means for providing a pitch determining voltage signal having a magnitude which is a function of the note of a depressed key;
first voltage-controlled frequency-variable oscillator means coupled to said keyboard circuit means to receive the pitch determining voltage signal therefrom for producing a first audible frequency signal the frequency of which corresponds to the note of the depressed key;
second voltage-controlled frequency-variable oscillator means coupled to said keyboard circuit means to receive the pitch determining voltage signal therefrom for producing a second audible frequency signal; and
means for coupling the second audible frequency signal from said second voltage-controlled oscillator means to said first voltage-controlled oscillator means to thereby produce a frequency-modulated tone signal in which the first audible frequency signal is frequency-modulated with the second audible frequency signal.
0 Assignments
0 Petitions
Accused Products
Abstract
An electronic musical instrument comprises first and second voltage-controlled frequency-variable oscillators responsive to application of a pitch determining voltage signal from a keyboard circuit to produce first and second audible frequency signals, respectively. The second audible frequency signal is coupled to the first voltage-controlled oscillator to produce a frequency-modulated tone signal to be sounded in which the first audible frequency signal is frequency-modulated with the second audible frequency signal. The content of harmonic components in a musical tone can be increased by sideband components resulting from frequency modulation. The second audible frequency signal may be amplitude-controlled to be proportional, in amplitude, to the magnitude of pitch determining voltage signal, amplitude-modulated with a time-varying control waveform, and/or waveform-modified to provide desirable modulation effects. The mixture of the pitch determining voltage signal and the second audible frequency signal may be coupled to the first voltage-controlled oscillator through an absolute value circuit. The second audible frequency signal may be also coupled to a sound system together with the frequency-modulated tone signal.
-
Citations
11 Claims
-
1. An electronic musical instrument comprising:
-
keyboard circuit means for providing a pitch determining voltage signal having a magnitude which is a function of the note of a depressed key; first voltage-controlled frequency-variable oscillator means coupled to said keyboard circuit means to receive the pitch determining voltage signal therefrom for producing a first audible frequency signal the frequency of which corresponds to the note of the depressed key; second voltage-controlled frequency-variable oscillator means coupled to said keyboard circuit means to receive the pitch determining voltage signal therefrom for producing a second audible frequency signal; and means for coupling the second audible frequency signal from said second voltage-controlled oscillator means to said first voltage-controlled oscillator means to thereby produce a frequency-modulated tone signal in which the first audible frequency signal is frequency-modulated with the second audible frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification