Communication system especially useful as an incident location reporting security system
First Claim
1. A communications system including a central receiver and a plurality of transmitters wherein each transmitter transmits to the central receiver, the system comprising:
- means in each transmitter for generating a modulated code particular to that transmitter, the code generating means including;
code determining means having a plurality circuit elements, each circuit element having a plurality of different pulse-width modes, means for setting each element in one of the modes to provide each transmitter with a unique code, wherein the number of codes available to the transmitter is determined by the number of modes raised to the power of the number of circuit elements;
means in each transmitter for generating a carrier signal for transmitting the modulated code of that transmitter to the receiver as a coded train;
means in the central receiver responsive to the carrier signal; and
means in the central receiver for reading the code of a transmitter carried by the carrier signal upon receipt thereof by the receiver to identify the particular transmitter transmitting the code.
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Accused Products
Abstract
The Incident Location Reporting Security System pertains to a device that is capable of determining instantaneously, via the use of pulse-width coded modulation, the location of incidences such as burglary, robbery and fire. Detailed multi-point monitoring can be carried out in such varied sites in a multistory buildings, residential neighborhoods, museums or individuals. The concept allows for generation and reading of billions of different codes through the simplistic design of a coded receiver wherein codes are read instead of matched. In achieving this capability, a base number is created by multiplying the plurality of positions of a switch times the number of switches and thereafter pulsing a transmitter a number of times to generate a code in which the base number is raised to the power of the number of times it is pulsed. Each transmitter is assigned a specific coded number and a single receiver rapidly processes and identifies any coded number received. In order to identify the position of an individual immediately at the time an alarm is sounded, triangulation is used.
307 Citations
24 Claims
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1. A communications system including a central receiver and a plurality of transmitters wherein each transmitter transmits to the central receiver, the system comprising:
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means in each transmitter for generating a modulated code particular to that transmitter, the code generating means including; code determining means having a plurality circuit elements, each circuit element having a plurality of different pulse-width modes, means for setting each element in one of the modes to provide each transmitter with a unique code, wherein the number of codes available to the transmitter is determined by the number of modes raised to the power of the number of circuit elements; means in each transmitter for generating a carrier signal for transmitting the modulated code of that transmitter to the receiver as a coded train; means in the central receiver responsive to the carrier signal; and means in the central receiver for reading the code of a transmitter carried by the carrier signal upon receipt thereof by the receiver to identify the particular transmitter transmitting the code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A communications system including a central receiver system and a plurality of transmitters wherein each transmitter is identified with a particular station and each transmitter transmits to the central receiver, the system comprising:
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means in each transmitter for generating a pulse-width modulated code particular to that transmitter, the code generating means including; switching means having a plurality of switches each of which has a plurality of different pulse-width modes, means for setting each switch in one of the pulse-width modes to provide each transmitter with a base number, and means for pulsing the transmitter a predetermined number of times, wherein the number of codes available to all transmitters is determined by the base number raised to a power equal to the number of times the transmitter is pulsed; means in each transmitter for generating a carrier signal for transmitting the pulse-width modulated code of that transmitter to the central receiver system as a coded pulse train; means in the central receiver system for reading the code of a transmitter upon receipt thereof by the receiver to identify the particular transmitter transmitting the code. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification