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Document Title |
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4785450 |
Apparatus and method for obtaining frequency agility in digital communication systems
In a communication system that comprises a plurality of subscriber stations in RF communication with a base station having multiple sequentially repetitive time slots, each time slot being assigned...
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4737977 |
Device and method for switching communications among taxis
A user connected by telephone to a central telephone exchange can inform an automatic switching communications device directly of his own telephone number by dialing on his telephone set, which...
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4726052 |
Radio telephone system and method for controlling same
In a radio telephone system comprising a radio telephone set utilizing a rechargeable battery, and a base unit connected to the radio telepone set through a radio channel for exchanging a speech...
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4682350 |
Equipment for wireless telephone transmission
A method of connecting audio information between a base telephone unit which is stationary and a portable unit associated therewith, the method involving dividing the communication time for audio...
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4677656 |
Telephone-radio interconnect system
A telephone interconnect system for a two-way radio communications system is disclosed. A telephone patch interconnect unit accepts dialed digits from a telephone line, encodes them into a data...
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4635285 |
Communication system with voice priority for remote stations
A two-way radio communications system of the simplex or half-duplex type having a communication link to a duplex telephone system is provided wherein the simplex or half duplex mobile radio is...
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4528656 |
Radio communication system using frequency division multiplexing for transmission between a master station and a plurality of remote stations
A point-to-multipoint radio communication system includes a master station and a plurality of remote stations which communicate with the master station using frequency division multiplexing. Each...
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4517561 |
Selective call, paging and priority signalling system
A selective calling, paging and priority signalling system for two way communications between at least one primary and a plurality of remote stations. An automatic selective calling mode is...
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4434504 |
Channeling and decode circuit for airborne radio-telephone systems
An airborne radio-telephone transceiver is provided having improved channeling and decode circuitry compatible with the selective signalling call-up system prescribed by the Federal Communications...
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4320265 |
Line repeater for telephone system using radio links
A telephone exchange communicates with a number of scattered local stations via radio links extending from a central terminal to respective peripheral installations each comprising a radio...
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4310722 |
Mobile radiotelephone station two-way ranging system
Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is...
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4280020 |
Radio telephone system with direct digital carrier modulation for data transmission
In a method of transmitting data and speech signals over a telephone system through which communication is effected via a radio link, the data and the speech signals are separated in the frequency...
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4268722 |
Radiotelephone communications system
A telephone system for providing communications between mobile radiotelephones, portable radiotelephones and landline telephones includes a land-line telephone system including a land-line...
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4257119 |
PCM switching system for wide and narrow band signals
A common control telecommunications switching system capable of efficiently handling both narrow band and wide band information. The system uses a hybrid digital network having a time division...
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4130731 |
Portable telephone system
A portable telephone system which utilizes both a VOX and a duplexer network wherein the necessity for the transmission of a continuous signal and continuous receiver scanning is eliminated,...
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4125808 |
Automatic sequential search for a radio relay network
This invention involves the implementation of a mobile, automatic range extension network for a communication system, such as may be used by a field army. Range extension techniques related to this...
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4071711 |
Telephone subscriber distribution system
This invention relates to a multi-point information distribution system useful for telephone service, data connecting systems and other applications which permits a central station to service a...
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4068104 |
Interface for in band SCPC supervisory and signalling system
An in band single channel per carrier supervisory and signalling apparatus and method is disclosed for satellite communications. The apparatus includes a near supervisory interface located at a...
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4012596 |
Telephone patch
Electronic patch circuitry interconnects a wire telephone line with the base station transmitter and receiver of a simplex two-way radio communication system, for causing VOX-type operation with...
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3912876 |
Frequency division switching network
Disclosed is a switching network usable in exchanges of a telecommunications system using frequency division switching. The input and output terminal circuits are interconnected by means of a...
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3897592 |
Voice-operated transmit system
Control apparatus is provided to intercommunicate transmit-receive systems such as radio sets one with another or with a telephone network. First and second signal processors convert a signal input...
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3840811 |
DUPLEXER TYPE RADIO-TELEPHONE DATA RECEIVER AND TRANSMISSION SYSTEM
A radio-telephone system embodying a duplexer network whereby a request for computerized data may be transmitted to a base station and the data received from the base station through a single...
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3626112 |
AUTOMATIC MOBILE RADIOTELEPHONE NETWORKS
A switching scheme is provided for a telephone exchange having an attached switching section for serving mobile sets. Subscriber-line circuits are provided in the said section, each allotted to a...
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3614326 |
TELEPHONE ACTUATED SWITCH
An electronic switch serving as a communications link between a remotely situated telephone caller and a headquarters. The communications link is adapted to connect a two-way radio to the telephone...
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3562438 |
INTRAPLANT RADIO COMMUNICATION SYSTEM
This invention relates to an intraplant communication system which provides, in addition to telephone communication, radio channels of communication whereby communication may be had with roving...
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3535689 |
METHOD AND CIRCUIT ARRANGEMENT TO CONNECT SUBSCRIBER TELEPHONE STATIONS AND HANDSETS VIA RADIO IN TELEPHONE SYSTEMS
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3513264 |
CONTROLLED RANDOM MULTIPLE ACCESS COMMUNICATION SYSTEM
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3484557 |
SUPERVISORY SIGNALING OVER RADIO-TELEPHONE SYSTEM
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3410963 |
AUTOMATIC REVERTIVE CALLING OVER A MOBILE TELEPHONE SYSTEM
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3198888 |
Radio telephone communication system
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3118018 |
Mobile radio telephone integrated system
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3110773 |
Delayed call telephone system
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3094661 |
Radio telephone system
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3087998 |
Radio telephone system
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3065421 |
Radio-telephone communication system having means for automatic direct dispatch between mobile stations
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3050591 |
Automatic mobile telephone system
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3009149 |
Automatic dial radio telephone system
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2987615 |
Mobile selector for common carrier radio telephone service
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2933560 |
Telecommunication systems
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2907874 |
Microwave communication system
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2901543 |
Radio system comprising a main station and a plurality of substations
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2870263 |
Radio or carrier terminal dial selector
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2843675 |
Radio telephone dispatch control and signaling circuit
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3588371 |
Title is not available
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