Matches 201 - 250 out of 258 < 1 2 3 4 5 6 >
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5008952 Global satellite communication system with geographic protocol conversion  
A satellite paging system is described for providing geogrpahic protocol conversion for data packet delivery to communication receivers located in a plurality of geographic areas. The system...
5001471 Paging system employing designated batch information service data message transmission  
A paging system which provides both individual and information services includes a transmitter for transmitting page call address and data periodically in batches, and a population of battery saver...
4996526 Power conservation method and apparatus for a portion of a synchronous information signal  
A receiver receives a transmitted digital signal having a synchronization signal and information signals. The receiver synchronizes to the synchronization signal and detects predetermined signals...
4975952 Method of data communication  
A method of data communication, particularly for long data messages, is disclosed. The data code words of a message are arranged in segments, each with its own header, and are assigned message and...
4972439 Active signalling transmitter control  
A transmitter, having controllable transmission functions is described for transmitting coded message signals to a plurality of portable communications receivers, the coded message signals...
RE33417 Mobile paging call back system and related method  
A mobile paging call back system is provided includes a control unit interconnecting a radio pager, a memory, an indicator, a control switch, and an automatic dialer, with the control unit...
4965569 Digitized stored voice paging receiver  
A paging receiver device and method are disclosed in which analog information transmitted from an external source such as a paging transmitter are received and decoded. The analog information...
4964121 Battery saver for a TDM system  
A power saving method and apparatus in a time division multiplexed system (10) capable of providing a synchronous full duplex communication between a telephone network (12) and a plurality of...
4955080 Selectively called receiver  
This selectively called receiver intermittently receives a frame signal including call information and transmitted through radio communication from a calling end on a battery saving basis and...
4951039 Animated data display interleaving  
A portable communications receiver is disclosed having a receiver for receiving and detecting periodically transmitted selective call paging signals and data signals. In response to the selective...
4914649 Multiple frequency message system  
A multiple frequency message system includes a transmitter for transmitting coded message signals on a plurality of channels of which at least one channel to be assigned to each of a plurality of...
4910510 System for off-the-air reprogramming of communication receivers  
A communication receiver is disclosed which can decode signals transmitted by radio frequency propagation. A programmable controller uses instructions in a non-volatile reprogrammable memory to...
4897835 High capacity protocol with multistation capability  
A wide area paging system is disclosed in which paging messages input to the system in one local area can be broadcast to a receiver in any other local area without necessarily broadcasting the...
4894649 Pager having time controlled functions  
A portable communication device provides user programmable control of addresses to which the portable communication device is responsive as a function of time. The device comprises a receiver, user...
4891637 Acknowledge back pager with apparatus for controlling transmit frequency  
An acknowledge back (ack-back) pager is provided for use in a paging system including a central station which transmits a group of message signals to a group of ack-back pagers which are addressed...
4873520 Paging receiver for storing digitized voice messages  
A selective call paging receiver for receiving analog voice information converts the analog information to digital information and stores the digital information in a memory of the paging receiver....
4870403 Paging receiver with a capability of receiving or inhibiting message data  
A paging receiver is capable of receiving message data. The receiver includes a data set and a hold circuit, the output logic of which is inverted in response to the detection of a control signal...
4870402 Multilingual paging system  
A communication system and in particular a paging system for transmitting information includes a keyboard, an encoder, a transmitter, a paging, the paging receiver comprising, a decoder, a...
4868860 Paging system for entering pages by local telephone call  
A paging network is disclosed which utilizes a plurality of distibuted switches to transmit pages on a non-real time basis to achieve efficient and low cost transmission. Each of the switches...
4860003 Communication system having a packet structure field  
A communication system develops an information packet having a packet structure field and at least one message. The message has an address and information associated with the address. A central...
4839628 Paging receiver having selectively protected regions of memory  
A paging receiver includes a nonvolatile memory which is readable for controlling the operation of the paging device and is capable of being partitioned into a plurality of regions. A protect means...
4831373 Method for dynamically allocating data channels on a trunked communication system  
Disclosed is a method to dynamically allocate a number of data channels on a trunked radio system (100). The data activity is monitored during a predetermined time interval. If activity is above...
4825193 Acknowledge back pager with adaptive variable transmitter output power  
An acknowledge back (ack-back) pager is provided for receiving paging signals from a central paging station. The central paging station transmits a group of message signals to a group of ack-back...
4816820 Radio communication receiver with apparatus for altering bit rate of the receiver  
A radio communication receiver decodes digital signals transmitted over a radio link and is capable of altering the bit rate of the receiver to match the bit rate transmitted form a remote...
4802240 Synchronous receiving method for selective calling signal  
A synchronous receiving method for a selective calling signal is disclosed, in which the selective calling signal comprises a first code of predetermined format which enables a receiving unit to...
4783654 Radio paging system capable of transmitting common information and receiver therefor  
A radio paging system for transmitting address signals and messages, as well as information common to a plurality of receivers, and a receiver applicable to such a system. The radio paging system...
4772887 Individual simulcast station control decoder  
A paging simulcast station remote control system decoder. The paging system decoder responds to signals generated in accordance with a predetermined signalling scheme comprising a series of tones...
4769642 Paging receiver with LPC speech synthesizer  
A paging receiver with an LPC speech synthesizer is described. The paging receiver of the present invention includes a controller and decoder, and a microprocessor controlled speech synthesizer...
4716407 Trunked communication system true priority channel scan  
While receiving a lower priority message, a remote transceiver unit in a trunked radio communication system is diverted immediately to a priority channel when a priority message is generated. In a...
4692945 Dispatch trunked radio system  
The present invention contemplates an improved dispatch trunked radio system which provides for individual subscriber to subscriber communication as well other enhanced trunking features. An...
4652875 Pager with improved battery saving function  
Method and apparatus for use with a pager having a battery-saving function. The pager can receive calls addressed to it even when the pager fails to catch the preamble of the broadcast signal. The...
4642632 Digital paging system having bit rate switching means and digital paging receiver therefor  
A paging system in which an address code is transmitted at a lower transmission rate than message code and a discrimination code defines the boundary between the address and the message. The...
4613859 Pager receiver selectively changeable between call number reception and message reception  
In a pager receiver responsive to a call number signal preassigned thereto, a decoder (25) detects the call number signal to deliver a call indication signal to a loudspeaker (27) and is connected...
4591853 Paging receiver with a decoder-P-ROM  
A paging receiver comprises a P-ROM with a built-in decoder for storage of N kinds of information. The stored contents of the P-ROM are read out in series in response to a clock frequency equal to...
4554540 Signal format detection circuit for digital radio paging receiver  
A signal detection circuit for a digital radio paging receiver is provided for successfully detecting a desired signal. A demodulated carrier wave, modulated with a code having n bits, is written...
4392135 Paging receivers  
A paging receiver is provided having an information setter that includes a memory device for storing call numbers assigned the receiver to enable it to determine when it has been individually...
4352199 Method and device for detecting and interpreting a distress signal  
An emergency telecommunications system wherein the distress signals are transmitted repeatedly in successive sequences each comprised of a detect interval during which an alarm signal is...
4328581 Adaptive HF communication system  
A high frequency communication system has at least two stations with each station having a discrete address, a transmitter, a receiver and a means for selecting the preferred frequency for...
4249165 Digital radio pager  
A digital radio pager provides for the reception and detection of (1) a preamble signal for synchronizing the pager to the incoming signal, (2) a calling signal comprised of a unique word...
4007422 Method and apparatus for calling a ground station by an aircraft  
A system for generating a special calling signal to be transmitted from an aircraft to a ground station comprising two parts of repeated groups of 7-unit binary code signals, each of which parts or...
3978449 Method and apparatus for in-band signalling in data transmission  
An in-band signalling system for the transmission of both data and control signals through a common communications channel is disclosed. Unique means of distinguishing data bits from control bits...
3936747 Code operated switching device for communications systems and the like  
The embodiment of the invention disclosed herein is directed to a code operated switching device having a receiver for handling RF frequencies in a superheterodyne fashion without the need of local...
3906445 Alphanumeric terminal for a communications system  
An alphanumeric terminal providing a digital message having a fixed portion consisting of the address of the receiver in sixteen bits, followed by a repeat of the address in sixteen bits, a status...
3851251 RECEIVER METHOD AND APPARATUS  
A novel receiver and method of receiver synchronization in which the period of receiver operation is a function of received signal characteristics and including a novel method of evaluating the...
3836726 DATA TRANSMISSION METHOD AND APPARATUS  
A plural transmitter, digital data transmission and remote control system in the environment of a paging system in which mutual interference by the transmitters is eliminated through the sequencing...
3694757 PSEUDO-RANDOM CODE RECOGNITION RECEIVER  
A receiver in a communication system for receiving a data signal having a preamble and a pseudo-random code. A preamble detector detects the preamble and initiates the operation of a local...
3628150 SELECTIVE PAGING SYSTEM  
A paging communication system for selectively signaling any of a plurality of individual paging receivers by transmitting a carrier-wave signal frequency modulated in accordance with a pulse-train...
3207851 Transmission system for pulse-codemodulated signals  
3097348 Secure communication system  
3056109 Automatic morse code recognition system  
Matches 201 - 250 out of 258 < 1 2 3 4 5 6 >