Music – Instruments
Patent
1977-06-22
1979-12-25
Jackmon, Edith S.
Music
Instruments
84 124, G10F 100, G10H 102
Patent
active
041799704
ABSTRACT:
The present invention is an arpeggio system for use in a musical instrument having a multiplexed keyboard, wherein operated playing keys are represented by cyclic pulses in corresponding time slots in a serial time division multiplex data format, connected over a single bus to a multiplexed pitch generator system for producing tones at pitches corresponding to the time slots in the serial data stream in which the cyclic pulses representing operated playing keys appear. The arpeggio system is connected in the serial data path in repeater fashion so as to be operated under control of the serial data stream received from the keyboard to selectively retransmit cyclic pulses in the serial time division multiplex data format to the pitch generator system. Two sequences are provided in the arpeggio system, one is operated in response to received multiplex signals representing a sustained chord to transmit multiplex signals representing individual notes of the chord played in ascending sequence and the other is operated upon completion of the ascending note sequence to shift the received signals by a time interval corresponding to an octave; whereby repeated operations of the two sequencing circuits generate multiplexed output signals representing a multi-octave arpeggio sequence of notes. Strum and up-down arpeggio modes are also provided for.
REFERENCES:
patent: 3842184 (1974-10-01), Kniepkamp et al.
patent: 3854366 (1974-12-01), Deutsch
patent: 3954038 (1976-05-01), Adams
patent: 4046047 (1977-09-01), Roberts
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