Title: Percussion processor for electronic musical instrument

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Abstract: A percussion processor for an electronic musical instrument, such as an electronic organ in which information representative of the actuation of selected switches corresponding to associated notes of the musical scale is furnished in the form of a time-division multiplexed signal having repetitive sequences of time slots, includes a delay circuit comprising a shift register having a time delay period equal to the duration of one of the sequences of time slots or an integer multiple thereof. The multiplexed signal train is applied to the delay circuit and also is applied in parallel to an inverter circuit. The output of the inverter and the output of the shift register are connected to different inputs of a NAND gate. The output of this gate is a time-division multiplexed signal with pulses in time slots corresponding to the time slots of the multiplexed signal applied to the input of the shift register, but from which such pulses are deleted after one or more sequences depending upon the length of the delay circuit. This modified signal is applied to percussion or chiff keyers and simulates a pizzicato touch, irrespective of the manner in which the keyboard originally producing the information is played.


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