Check-actuated control mechanisms – Including noncontacting – relatively movable parts connected...
Patent
1975-04-03
1976-06-01
Reeves, Robert B.
Check-actuated control mechanisms
Including noncontacting, relatively movable parts connected...
360 69, 194 15, 35 8R, G07F 510
Patent
active
039602540
ABSTRACT:
A tape playback unit is designed to transmit messages recorded on an endless loop dual channel recording tape. The tape contains a series of independent messages recorded on one channel and stop-start signals coordinated with the beginning and end of each message on the other channel. A multiple of receiving units each having an audio receiver as in a telephone receiver, hereafter referred to as an earphone, are connected to said playback unit and the independent messages contained on the tape are transmitted to the earphones. A control unit associated with each receiving unit intercepts the message being transmitted by the playback unit and permits transmitting thereof to the earphone only upon activation of a switch associated with the receiving unit, e.g. activated by a coin. The control unit further includes a timer associated with detecting means for detecting the beginning and end of each message, i.e. it detects the stop-start signals on said other channel. The earphone receives transmission only after the switch is activated and the start of a sentence is detected and ends only after the timer signals completion of the timing cycle and the end of a sentence is detected.
REFERENCES:
patent: 2782529 (1957-02-01), Shinn
patent: 2799731 (1957-07-01), Straub
patent: 2960577 (1960-11-01), Pray et al.
patent: 3419687 (1968-12-01), Stewart
patent: 3707213 (1972-12-01), Larre
Fial Ronald Augustine
Markowtiz Hal
Harrington Robert L.
Portland Zoological Society
Reeves Robert B.
Skaggs H. Grant
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