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Alarm-system-with-acoustically-coupled-transmitters-and-receiver

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Alarm system with acoustically coupled transmitters and receiver

Details

Inventors: Meyer, Michael M.;
Assignee:
Primary Examiner: Waring; Alvin H.
Assistant Examiner:
Attorney, Agent or Firm:

An alarm system in which local transmitters emit substantially pure acoustic signals for at least a predetermined minimum interval. The receiver includes a microphone and amplifier for transducing the acoustic signals into electrical signals. These electrical signals pass through two bandpass stages, the second being a phase locked loop circuit. An RC timing network is connected to the second bandpass circuit. After about 7500 cycles of the electrical signal have been received an "alarm received" signal occurs. The "alarm received" signal is applied to the triggering input of a free-running pulse generator which supplies pulse trains to a counter and is itself halted when the counter reaches a first intermediate state. A second "alarm received" signal is required to restart the free-running pulse generator and thus advance the counter beyond said first intermediate state. Thereafter, when the counter reaches a second intermediate state, the occurrence of the corresponding second intermediate state signal actuates a suitable alarm signal to warn of intrusion or some other hazardous condition.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide "wireless" alarm and other control systems which are relatively inexpensive and easy to install, and at the same time are relatively free from "false alarms" triggered by stray electrical signals.
It is another object of the present invention to provide "wireless" alarm and other control systems wherein the emergency condition information provided by emergency condition sensors is transmitted to the central control unit or control units by acoustic signals emitted by local transmitter units.
It is yet another object of the present invention to provide unique acoustic signals for use in acoustic wireless alarm systems, which unique acoustic signals so distinguish from generally prevailing stray acoustic signals as to be distinguishable from virtually all such stray acoustic signals by associated receivers, thus greatly reducing or completely eliminating "false alarms".
Other objects of the present invention will in part be obvious and will in part appear hereinafter.
The present invention, accordingly, comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the present invention will be indicated in the appended claims.
In accordance with a principal feature of the present invention, a remote control system is provided which comprises an acoustic transmitter and an acoustic receiver, control information being transmitted from said acoustic transmitter to said acoustic receiver by acoustic signals each consisting of at least an audible tone of predetermined minimum duration.
In accordance with another principal feature of the present invention, an alarm system is provided which comprises an acoustic receiver and at least one acoustic transmitter, information being transmitted from said at least one acoustic transmitter to said acoustic receiver by acoustic signals each consisting of at least an audible tone of predetermined minimum duration

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