Transmitter-receiver coded security alarm system
First Claim
1. A transmitter-receiver burglar alarm system comprisinga battery powered transmitter unit including a transmitter of radio waves,means for sensing a low battery voltage at said transmitter unit,said transmitter unit having means for transmitting a low battery voltage signal, and means for transmitting a channel selecting code bit,means connected to the transmitter unit for preventing said transmitter unit from making further transmissions after transmitting said low battery voltage signal,a base station including a receiver for receiving radio waves transmitted by said transmitter unit,said base station having means responsive to transmission of said channel selecting code bit to provide a first audible sound and responsive to the absence of said channel selecting code bit to produce a second audible sound,said base station further including at will actuatable means responsive to receipt of said channel selecting code bit for producing a third audible sound, andmeans responsive to said low battery voltage signal for producing a fourth audible sound.
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Accused Products
Abstract
A transmit-receive burglar alarm system provides for code changing so that the user may readily change the transmitted code to which the system will respond. The transmitter is battery powered, and the transmission circuits are disabled except during transmission intervals to conserve battery life, the transmitter transmitting a weak battery signal when the battery voltage falls below a prescribed level, the receiver providing a distinctive signal in response thereto. The transmitter may select one of two channels at the receiver depending upon the desired response and may also select a delayed or immediate response if the receiver is in the delay mode. The home or base station includes a receiver and a microprocessor to determine first if the transmitted code is proper to respond to and then on which of two channels the response is to be indicated; the channels determining the format of the audio signal to be generated both on internal and external audio devices. The base station determines whether system response is to be immediate or whether the transmitter is to control response as either immediate or delayed. System, battery and indicator light tests are provided as are indications for loss of a.c. or low base station battery. Ability to change the disarm code is also provided together with means to cause the disarm code to revert to a factory disarm code if the changed code is forgotten or all power is lost.
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Citations
24 Claims
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1. A transmitter-receiver burglar alarm system comprising
a battery powered transmitter unit including a transmitter of radio waves, means for sensing a low battery voltage at said transmitter unit, said transmitter unit having means for transmitting a low battery voltage signal, and means for transmitting a channel selecting code bit, means connected to the transmitter unit for preventing said transmitter unit from making further transmissions after transmitting said low battery voltage signal, a base station including a receiver for receiving radio waves transmitted by said transmitter unit, said base station having means responsive to transmission of said channel selecting code bit to provide a first audible sound and responsive to the absence of said channel selecting code bit to produce a second audible sound, said base station further including at will actuatable means responsive to receipt of said channel selecting code bit for producing a third audible sound, and means responsive to said low battery voltage signal for producing a fourth audible sound.
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13. A transmitter receiver coded alarm system comprising:
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a base station including (a) a receiver for receiving digital signals, (b) an alarm means, (c) two channels, (d) delay means for providing a delay in producing an alarm signal to a set signal input to said delay means, and (e) means responsive to an electrical power fault condition to produce an indication thereof, a plurality of transmitters for transmitting digial signals to said receiver means upon detection of predetermined conditions, first means for programming said receiver to receive digital signals having a selected n-bit identification code, where N is a positive integer, said transmitters including means for incorporating the selected n-bit identification code on signals transmitted to said receiver, and for selectively transmitting a delay response code and for transmitting a channel selection code, one of said channels of said base station being responsive to receipt of a said n-bit identification code to activate said alarm, the other of said channels delaying activation of said alarm upon receipt of said n-bit identification code and said delay response code, when said delay response means has been set to produce a delayed response, each said transmitter having a separate battery and means for generating a low power signal, a shut-down switch at each transmitter, means at each transmitter for producing a low power code signal in response to said low power signal, said low power signal being communicated (a) first to said receiver and (b) thereafter to said shut down switch whereby to deactivate said transmitter, means for communicating an alarm disarm code to the base station, means for inhibiting the alarm means in response to the communication of the alarm disarm code, the inhibiting means being selectively interposed between the communicating means and the alarm means, means for defining the alarm disarm code as a first disarm code, means, associated with the defining means for storing the first disarm code, means, associated with the defining means, for automatically reverting the alarm disarm code back to the first alarm disarm code in response to the indication of an electrical power fault condition, the reverting means being coupled to the first disarm code storing means. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An alarm system comprising:
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a base station having means responsive to an electrical power fault condition for producing an indication thereof, means for communicating an alarm disarm code to the base station, means for inhibiting the alarm means in response to the communication of the alarm disarm code, the inhibiting means being selectively interposed between the communicating means and the alarm means, means for defining the alarm disarm initially as a first disarm code, means, associated with the defining means, for storing the first disarm code, means, associated with the defining means, for changing the defined alarm disarm code, at will, from one alarm disarm code to another alarm disarm code, means, associated with the defining means, for reverting the alarm disarm code back to the first alarm disarm code in response to the indication of an electrical power fault condition, the reverting means being coupled to the first disarm code storing means. - View Dependent Claims (24)
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Specification