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Electronic musical instrument having a vibrato effecting capability

  • US 4,957,030 A
  • Filed: 05/23/1989
  • Issued: 09/18/1990
  • Est. Priority Date: 05/26/1988
  • Status: Expired due to Fees
First Claim
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1. An electronic musical instrument capable of effecting vibratos with a tone being produced, comprising:

  • a keyboard having a vibrato switch;

    key detecting means for detecting a key on said keyboard which is pressed down;

    key constant storing means storing predetermined key constants each being associated with respective one of tones which may be produced by said instrument;

    address signal generating means for generating an address signal by performing, every predetermined period of time, an arithmetic operation with the key constant associated with the key which is pressed;

    tone waveform storing means storing amplitudes of a tone waveform each being associated with respective one of a plurality of sampling points, in the form of digital values;

    digital-to-analog converting means for sequentially converting the digital amplitudes read out of said tone waveform storing means in response to the address signals into an analog tone signal;

    counting means for counting clock pulses which begin to appear when a power supply of said instrument is turned on;

    vibrato constant storing means storing vibrato constant each being associated with respective one of the keys on said keyboard; and

    adding and subtracting means for, when said vibrato switch is pressed, periodically performing addition and subtraction with the key constant and vibrato constant in response to an addition/subtraction switchover signal and an addition/subtraction execution control signal which are constituted by an output of said counting means.

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