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Electronic musical instrument

  • US 3,979,996 A
  • Filed: 05/27/1975
  • Issued: 09/14/1976
  • Est. Priority Date: 05/31/1974
  • Status: Expired due to Term
First Claim
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1. An electronic musical instrument comprising:

  • means for generating a key address code representing the note and keyboard of a depressed key;

    a freqeuncy information memory for producing, upon receipt of said key address code, basic frequency information corresponding to said key address code;

    a vibrato code generator for counting a clock pulse used for providing a musical tone to be reproduced with a periodic frequency variation and producing a counting output as a vibrato code;

    a vibrato information generator for producing an output in the form of a function representing the ratio of the frequency variation in response to the counting output of said vibrato code generator;

    a multiplier for multiplying said output in the form of a function with said basic frequency information;

    a counter for receiving and counting the result of multiplication by said multiplier; and

    a musical tone waveshape memory for storing a desired musical tone waveshape which is read out by the output of said counter;

    a vibrato effect being produced by frequency-modulating a predetermined pitch corresponding to the depressed key in accordance with the function represented by the output of said vibrato information.

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