Scanning receiver for nationwide radio paging system
First Claim
1. In a radio paging system comprising input means for inputting paging information, a plurality of radio common carriers located in the same geographical area, each of said common carriers being adapted to broadcast a paging signal having a predetermined format on a predetermined frequency, the improvement comprising:
- network means coupled to said input means and to said plurality of radio common carriers for connecting said plurality of radio common carriers into a network, said network means being adapted to receive paging information from said input means over a first transmission path and providing said paging information to a selected one of said radio common carriers over a second transmission path for radio broadcast; and
receiver means for receiving said paging signal broadcast by any one of said radio common carriers, said receiver means comprisingantenna means for receiving said paging signal;
oscillator means for providing a reference signal;
mixer means coupled to said antenna means and to said oscillator means for mixing said paging signal with said reference signal to produce a second paging signal;
logic means coupled to said oscillator means for controlling said oscillator means to generate said reference signal at a selected one of a plurality of predetermined frequencies, wherein said receiver means is caused to scan predetermined frequencies;
detector means coupled to the output of said mixer means for receiving said second paging signal and detecting said paging signal on any one of said scanned predetermined frequencies and providing a detection signal when said paging signal is received, said logic means receiving said detection signal and controlling said oscillator means to lock said receiver means onto the current scanned frequency and receive said paging signal;
decoder means for decoding said second paging signal to retrieve said paging information; and
output means coupled to said decoder means for outputting to a user at least some of said paging information.
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Accused Products
Abstract
A scanning radio reciever for a wide area paging system which interconnects conventional radio common carriers (RCC) for broadcasting page information. A plurality of RCC'"'"'s in each geographical area served by the paging system of the invention are connected to a local page processor. The local page processor processes incoming page information and transfers the information to an available RCC for broadcast in the local area. If broadcast of the page information is also desired in a remote geographical area, a copy of the page information is transferred to a central page processor for distribution to the selected remote geographical area for broadcast. The paging receiver is designed so that it scans the frequency of a plurality of RCCs. Thus, the same receiver may be used to receive pages from more than one RCC.
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Citations
55 Claims
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1. In a radio paging system comprising input means for inputting paging information, a plurality of radio common carriers located in the same geographical area, each of said common carriers being adapted to broadcast a paging signal having a predetermined format on a predetermined frequency, the improvement comprising:
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network means coupled to said input means and to said plurality of radio common carriers for connecting said plurality of radio common carriers into a network, said network means being adapted to receive paging information from said input means over a first transmission path and providing said paging information to a selected one of said radio common carriers over a second transmission path for radio broadcast; and receiver means for receiving said paging signal broadcast by any one of said radio common carriers, said receiver means comprising antenna means for receiving said paging signal; oscillator means for providing a reference signal; mixer means coupled to said antenna means and to said oscillator means for mixing said paging signal with said reference signal to produce a second paging signal; logic means coupled to said oscillator means for controlling said oscillator means to generate said reference signal at a selected one of a plurality of predetermined frequencies, wherein said receiver means is caused to scan predetermined frequencies; detector means coupled to the output of said mixer means for receiving said second paging signal and detecting said paging signal on any one of said scanned predetermined frequencies and providing a detection signal when said paging signal is received, said logic means receiving said detection signal and controlling said oscillator means to lock said receiver means onto the current scanned frequency and receive said paging signal; decoder means for decoding said second paging signal to retrieve said paging information; and output means coupled to said decoder means for outputting to a user at least some of said paging information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A scanning radio paging receiver for a paging system formed of a network of radio common carriers, said network having input means for inputting paging information and network means coupled to said input means and to said plurality of radio common carriers for connecting said plurality of radio common carriers into a network, said network means being adapted to receive paging information from said input means over a first transmission path and providing said paging information to a selected one of said radio common carriers over a second transmission path for radio broadcast, receiver means for receiving said paging information broadcast by any one of said radio common carriers, said receiver comprising:
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antenna means for receiving a paging signal; oscillator means for providing a reference signal; mixer means coupled to said antenna means and to said oscillator means for mixing said paging signal with said reference signal to produce a second paging signal; logic means coupled to said oscillator means for controlling said oscillator means to generate said reference signal at a selected one of a plurality of predetermined frequencies, wherein said receiver is caused to scan predetermined frequencies, and wherein said logic means controls said oscillator to cause said receiver to remain tuned to each of said scanned predetermined frequencies for a predetermined dwell time, if said paging signal is not received within said dwell time, said logic means controlling said oscillator means to cause said receiver to tune to another of said scanned predetermined frequencies; detector means coupled to the output of said mixer means for receiving said second paging signal and detecting said paging signal on any one of said scanned predetermined frequencies and providing a detecting signal when said paging signal is received, said logic means receiving said detection signal and controlling said oscillator means to lock said receiver onto the current scanned frequency and receive said paging signal; decoder means for decoding said second paging signal to retrieve paging information; and output means coupled to said decoder means for outputting to a user at least some of said paging information. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification