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Electronic musical instrument with frequency modulation of a tone signal with an audible frequency signal

  • US 4,173,164 A
  • Filed: 05/25/1978
  • Issued: 11/06/1979
  • Est. Priority Date: 06/01/1977
  • Status: Expired due to Term
First Claim
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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.

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