RADIO SIGNAL INITIATED REMOTE SWITCHING SYSTEM

• US 3,665,475 A
• Filed: 04/20/1970
• Issued: 05/23/1972
• Est. Priority Date: 04/20/1970
• Status: Expired due to Term

• Current Assignee: Herbert R. Gram
• Original Assignee: Herbert R. Gram
• Inventors: Gram, Herbert R.
• Primary Examiner(s): Yusko, Donald J.
• Application Number:
  US05/029,949
• Time in Patent Office: 764 Days
• Field of Search: 325/37,65,323,350 343/225,228
• US Class Current: 340/12.5
• CPC Class Codes: G08C 19/12 in which the signal transmitted is frequency or phase of ac

Abstract

A radio signalling system includes a transmitter operating to transmit a continuous carrier signal periodically modulated with a tone signal burst. A receiver includes an amplifier-detector operating to recover the audio tone signal bursts, which are then amplified, threshold detected, and converted to corresponding output pulses. A discriminator, responding to the amplifierdetector output, enables a gate only during the intervals between tone signal bursts when unmodulated carrier is received. The output pulses are passed by the enabled gate and accumulated to ultimately effect triggering of switching means to initiate a remote switching function. Energization of the transmitter is achieved by selectively positioning a pivotally mounted battery to make an electrical contact between a battery terminal and a stationary terminal contact.

Claims

1. A radio communications system for initiating actuation of a device from a remote point, said system comprising, in combination:

A. a transmitter operable to transmit a continuous carrier signal periodically modulated with a burst of a tone signal;

B. a receiver adapted to receive transmissions from said transmitter;

C. a detector in said receiver for recovering said periodic bursts of tone signal from said continuous carrier signal;

D. means for converting each said tone signal burst to a corresponding output pulse and for storing said pulse;

E. a gate connected to control passage of each stored pulse from storage;

F. gate control means connected to the output of said detector for enabling said gate to pass stored output pulses only during the periodic intervals of reception of unmodulated carrier signal;

G. means for accumulating output pulses passed by said gate when enabled; and

H. switching means coupled to said accumulating means and energized thereby when a desired condition of pulse accumulation has been reached to initiate actuation of the device.

2. enable said gate only during each interval of reception of substantially noise-free, unmodulated carrier signal;

G. means connected to the output of said detector for converting said recovered periodic tone signal bursts into corresponding output pulses;

H. means for receiving each said output pulse and presenting it in stored form for passage through said gate when enabled;

I. means connected to the output of said gate for accumulating said output pulses passed by said gate when enabled; and

J. switching means controlling actuation of the device and connected to said accumulating means,

3. A radio signal initiated remote switching system for actuating a device from a remote point, said system comprising A. a transmitter operable to transmit a continuous carrier signal;

B. means in said transmitter for periodically generating a burst of tone signal for modulating said carrier signal and leaving intervals when said carrier signal is free of such tone signal modulation;

C. a receiver adapted to receive said periodically modulated carrier signal;

D. a detector in said receiver for recovering said tone signal bursts;

E. a gate circuit in said receiver;

F. a discriminator connected to the output of said detector and to a control element of said gate, said discriminator operating to

4. The system defined in claim 3, wherein said detector comprises a super-regenerative detector.