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Ensemble effect for a musical tone generator using stored waveforms

  • US 4,716,805 A
  • Filed: 09/08/1986
  • Issued: 01/05/1988
  • Est. Priority Date: 09/08/1986
  • Status: Expired due to Term
First Claim
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1. In combination with a keyboard operated musical instrument having an array of keyswitches apparatus for producing a musical tone having ensemble effect comprising;

  • an assignor means whereby a detect data word is generated in response to each actuated keyswitch in said array of keyswitches and whereby one of a plurality of tone generators is assigned to each said actuated keyswitch,a frequency number generator means whereby a frequency number is generated in response to each said detect data word and whereby said frequency number is provided to an associated one of said plurality of tone generators;

    said plurality of tone generators each of which comprises;

    a waveshape memory for storing a preselected set of waveshape data words,a clock for providing timing signals,a memory addressing means, responsive to said timing signals, whereby said preselected set of waveshape data words are read out sequentially from said waveshape memory at a memory address advance rate responsive to said frequency number provided to said assigned tone generator,a plurality of delay means each of which delays the data words read out of from said waveshape memory by a preselected number of said timing signals,a data select means for selecting output data from one of said plurality of delay means in response to a delay control signal,a combining means for combining the output data selected by said data select means with the data words read out of said waveshape memory to form a sequence of composite data words, anda means for producing said musical tone having an ensemble effect responsive to said sequence of composite data words.

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