Electrical transmission or interconnection systems – Plural load circuit systems – Selectively connected or controlled load circuits
Patent
1985-10-08
1988-04-05
Ro, Bentsu
Electrical transmission or interconnection systems
Plural load circuit systems
Selectively connected or controlled load circuits
307242, G05B 2402, H04Q 914
Patent
active
047361158
DESCRIPTION:
BRIEF SUMMARY
This invention relates to electrical control circuits of the kind providing for operator control at any one of plural remote positions after registration of selection by the operator of a controlling device at that position.
BACKGROUND ART
Control circuits of this kind, although having many other applications, are commonly employed in motion picture theatres and other auditoriums equipped with public address systems or other forms of amplified sound equipment. By their use a person, or persons, at different parts of the theatre may determine the optimum volume of sound for the comfort of patrons. This has been achieved by locating a multiplicity of controlling devices at individual positions throughout the theatre and providing for control of the sound amplitude at any instant only at a single device which has been selected by the operator and identified. Hitherto, equipment of this nature has employed electro-mechanical components and has been expensive, cumbersome and not sufficiently flexible in use.
DISCLOSURE OF INVENTION
It is the main object of the invention to provide a control circuit of the above kind which is relatively inexpensive and compact.
To this end the invention in one general form consists of a control circuit for an electrical function and comprising a plurality of controlling devices connectable to a control bus of the circuit for said electrical function, and including a selection control circuit common to all of said controlling devices, each one of said controlling devices having a manual control for said function connectable via a semi-conductor switching device to said control bus, a switch manually operable for effecting by means of a signal from said selection control circuit activation of said switching device of a selected one of said controlling devices, and a trigger device effecting activation of said switching device when said trigger device is latched by operation of said manual switch and simultaneous receipt of said signal and becoming unlatched upon receipt of a subsequent one of said signals at a time when said manual switch is not operated.
BRIEF DESCRIPTION OF DRAWINGS
The invention will be more readily understood from the following description of a preferred embodiment read in conjunction with the accompanying drawing (sole FIGURE) of a schematic diagram of a controlling device constructed according to this invention.
BEST MODE OF CARRYING OUT THE INVENTION
It will be assumed that the controlling device shown in the drawing is one of a plurality of such devices disposed at convenient positions thoughout a motion picture theatre about which is installed a control bus of a ribbon cable of conventional form connected with control apparatus which is common to all of the controlling devices. This apparatus will have an ground bus, a power bus and a control bus of the ribbon cable connected with a summing amplifier to operate D.C. controlled electronic attenuators for sound being broadcast within the theatre. Each controlling device, as shown in the drawing, is preferably provided in a compact portable casing and utilizes a conventional insulation displacement connector to permit the device to be electrically connected to the ribbon cable at any convenient position within the theatre, either upon installation of the control circuit, or even at the will of an operator.
Each one of the controlling devices, as shown by the drawing, is terminated at points v, w, x, y and z on its connector and these terminals in turn will derive from the ribbon cable, respectively, RESET, STROBE, power, ground and CONTROL. It will also be noted that the entire logic of this circuit is derived from a single quad analogue gate 4016 and a single dual input quad NAND gate 4011. Both are inexpensive, semi-conductor chips.
Switch SW1 is manually operable by the operator for selection of the respective controlling device. The switch SW1 is preferably a press-button housing the LED which becomes illuminated upon selection of the device in order to identify the controlling device where c
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Greater Union Theatre Supplies Pty. Limited
Ro Bentsu
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