System for registering and selecting stops in a musical instrume

Details System for registering and selecting stops in a musical instrume System for registering and selecting stops in a musical instrume

1978-02-17

1981-01-13

Miller, Jr., George H.

Music

Instruments

Wind

84370, G10B 310

Patent

active

042442648

ABSTRACT:
An electronic musical instrument, such as a pipe organ, has a multiplicity of manually and electrically positionable knobs for selecting and restoring respective organ stops, any combination of signals representing selected and unselected stops being recordable in a nonvolatile memory from which that combination can be subsequently read out under the control of a keyboard and a set of pushbuttons. Whenever a new signal combination is called forth from the memory, switching instructions are loaded into a multiplicity of cascaded register stages whose outputs are connected via respective interface circuits to selecting or restoring coils of respective knobs. The interface circuits are unblocked simultaneously by a transfer instruction from the memory to establish the new knob positions. The loading of the register stages is controlled by a unit which compares the existing positions of the knobs with those specified by the selected signal combination and sends switching instructions only to those register stages whose knobs have to be repositioned. A series of cascaded ancillary memories of the read/write type may be loaded with a limited number of signal combinations appearing consecutively in the nonvolatile main memory for facilitating a quick changeover from one of these combinations to another.

REFERENCES:
patent: 3926087 (1975-12-01), Griffis
patent: 4006658 (1977-02-01), Kappes
patent: 4078465 (1978-03-01), Wheelwright

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