G - Physics – 10 – H
Patent
G - Physics
10
H
84/1.1
G10H 1/06 (2006.01) G10H 1/10 (2006.01) G10H 1/38 (2006.01)
Patent
CA 1109302
POLYPHONIC ELECTRONIC MUSIC SYSTEM ABSTRACT OF THE DISCLOSURE Simultaneously played notes are automatically provided with different voices. Voices are assigned to notes depending upon their relative frequencies and the number of keys played. Generally, the three lowest notes and the highest note are sounded in different voices. When fewer than four keys are played voices are doubled up. In one embodiment, time division multiplex digital logic signals representative of the played keys are applied to memory and comparator circuits. If a scan indicates no change in played keys, the comparator pro- vides an enabling signal to a monostable and enable logic circuit. A priority selector circuit provides information representative of the three lowest keys and the highest key played to a monostable and enable logic circuit. The monostable and enable logic circuit provides information representative of the three lowest keys played, the highest key played, and the total number of keys played. This information is combined with octave information and note time slot information in four programmable counter circuits which divide four input frequencies from a rate scaler frequency generator to produce four tone signals having fundamental output frequencies fl - fH corresponding to the three lowest notes and single highest notes played. The four programmable counter circuits provide control voltages corresponding to the played notes. The tone signals and control voltages are applied to voltage con- trolled gates and filters which provide the voicing to produce different orchestral effects on different notes. The outputs of the voltage controlled gate and filters are applied to at least two output channels to avoid electrical cancellations.
306514
Munch Walter
Uetrecht Dale M.
Baldwin (d.h.) Company
Johnson Douglas S. Q.c.
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