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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 5249181 | Call processing using logical channel assignments A communications network includes satellites, which serve as switching nodes and move in orbits about the earth. The network additionally includes stationary switching offices. Mobile communication units communicate with the network through the satellites... | 09/28/1993 |
| 4979170 | Alternating sequential half duplex communication system A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one central communication station having a first transceiver fo... | 12/18/1990 |
| 4905235 | TDMA system capable of individually controlling electric power of bursts In a TDMA system comprising a plurality of earth stations communicable with one another by the use of a plurality of carrier waves through a transponder of a satellite which has an available electric power level, bursts carried by the carrier waves are in... | 02/27/1990 |
| 4888769 | TDMA terminal controller A TDMA terminal is disclosed having a plurality of terrestrial interface ports, and a plurality of modems for modulating preamble and port data onto a carrier and demodulating the received data transmitted via a satellite from the carrier wherein the inte... | 12/19/1989 |
| 4872164 | Method and arrangement for compensating shifts in delay produced by the doppler effect in bursts in a TDMA frame A method for compensating for shifts in delay caused by the Doppler effect in the bursts from ground stations when received by a transponder satellite, wherein a search is made within the bursts for agreed-upon bit patterns. Then a phase comparison is mad... | 10/03/1989 |
| 4792948 | Distributed switching architecture A communication network made up of distributed switching stations controlled by a network control center. The distributed switches communicate with each other over long haul links and locally with users over short haul communication channels to user switc... | 12/20/1988 |
| 4774708 | Station of a TDMA communication network capable of quickly changing communication traffic without causing an overlap between transmission bursts In a terrestrial station of a TDMA communication network, a TDMA frame includes a particular time slot shared by the station and other stations of the network. In order to increase communication traffic, each station can send a transmission burst in the p... | 09/27/1988 |
| 4757502 | Automatic gain control method and circuit for a time division multiple access receiver An AGC method and circuit for a receiver of time division multiple access signals, e.g. signals transmitted by a satellite or be microwave links. The AGC circuit includes a highspeed attenuator (24) constituted by two ring mixers (40, 41) connected in ser... | 07/12/1988 |
| 4731783 | Method and system for time division multiple access satellite telecommunications A frame (T) is sub-divided into identical time slots (61, 62, . . . , 6N) of fixed duration, each of which is capable of containing at least one lowest data rate telephone channel. These time slots are assigned on demand so that a new call is spread over ... | 03/15/1988 |
| 4715033 | State information communication in a TDMA satellite communication network with high frame availability In each terrestrial station (12), a collecting circuit (97) collects those state information signals as a collected signal which represent states of operation of communication devices (94, 95). A state information signal sending device (101) sends the col... | 12/22/1987 |
| 4712212 | Terminal control device for reference station in TDMA satellite communication system A terminal control device for a reference station in a TDMA satellite communication system includes means for generating a parallel acquisition window applicable to a parallel initial acquisition system and a sequential acquisition window applicable to a ... | 12/08/1987 |
| 4688216 | Station relief arrangement for use in relieving operation of a reference station in a TDMA network without reduction of frame availability In a TDMA satellite communication network comprising a plurality of earth stations, a predetermined one of the stations is operable as a primary reference station for producing a first and a second reference burst to define a multiframe and a frame in an ... | 08/18/1987 |
| 4686672 | TDMA communications apparatus having adaptive burst duration A telecommunication system includes an earth-to-satellite-to earth link over which transmission is made on a time division basis. Each earth station assembles data to be transmitted in bursts during time period assigned to such earth station. The time pos... | 08/11/1987 |
| 4637017 | Monitoring of input backoff in time division multiple access communication satellites A method of measuring input-backoff to an amplifier in a time-division multiple access (TDMA) communication system having a carrier recovery segment and a clock recovery segment prior to a data segment in a traffic burst. A monitoring station transmits a ... | 01/13/1987 |
| 4625308 | All digital IDMA dynamic channel allocated satellite communications system and method An all digital TDMA dynamic channel allocated satellite communications system and method provides a satellite communications network between geographically separated nodes. The topology of the network is controlled by an on-line master node in accordance ... | 11/25/1986 |
| 4606019 | Receive data processing device for TDMA satellite communications network A receive data processing device for monitoring operating conditions of TDMA ground stations which is installed in a TDMA reference ground station adapted to monitor and control TDMA satellite communications channels. An idle time in each of TDMA frames w... | 08/12/1986 |
| 4599720 | Satellite communications system Distributed transmission control for a TDMA system including one or more user networks. A time synchronized burst modem, one at each earth station in a system, transfers TDMA frame timing signals to an interconnected data processing machine. The interconn... | 07/08/1986 |
| 4597079 | Redundant switchover system for TDMA satellite communication equipment In a redundant switchover system for a TDMA satellite communication system for relaying messages from earth station to earth station (A, B, C) via a communication satellite (SAT), an initially active terminal unit (1) for determines at an early stage that... | 06/24/1986 |
| 4591730 | Master clock generator for telecommunications system A very stable master clock for satellites is disclosed. Time division multiple access techniques are used to permit individual earth stations to be received by the satellite in separate non-overlapping time slots. The satellite switched time division mult... | 05/27/1986 |
| 4586177 | Integrated narrowband and wideband TDMA networks Time Division Multiple Access (TDMA) is being utilized widely in domestic and international communication networks. The types of TDMA networks in operation fall into two categories: Wideband and Narrowband. In the past few years, a number of Wideband and ... | 04/29/1986 |
| 4581736 | Multiple downlink data aggregator and system In a TDMA satellite communications system with a plurality of transponders and a network of satellite communication controller (SCC) terminals, a data aggregator which may be attached to a local SCC. The data aggregator simultaneously receives TDMA frames... | 04/08/1986 |
| 4470148 | Satellite-receiver time division multiple-access burst duration and guard space monitor A burst duration and guard space monitor circuit which produces burst duration and guards space signals which are substantially unaffected by nulls or near nulls in a received QPSK signal. The received QPSK signal is compared with a fixed threshold voltag... | 09/04/1984 |
| 4418425 | Encryption using destination addresses in a TDMA satellite communications network An encryption system is disclosed which is based on channel destination addresses for a time division multiple access (TDMA) satellite communications network. A superframe initialization vector is transmitted from a master station to all other stations in... | 11/29/1983 |
| 4357700 | Adaptive error encoding in multiple access systems In a time division multiple access (TDMA) system, for "multi-path" data communication via satellite repeater, the form of transmitted data is varied adaptively to maintain error-free transmission under varying noise conditions. Adjustments are made on a p... | 11/02/1982 |
| 4330857 | Dynamically variable priority, variable position channels in a TDMA burst The position of a channel of information transmitted from a particular port is varied in response to the changing priority of that port's messages as time passes. Variable priority assignments become necessary when low speed data has been deferred in its ... | 05/18/1982 |
| 4322845 | Demand assignment technique for TDMA satellite communication network In a time division multiple access satellite communication system, a reference station which allocates channel capacity also regulates demand by the ground stations for that capacity. The regulation is accomplished by means in the reference station for tr... | 03/30/1982 |
| 4319352 | TIM Bus structure A plurality of terrestrial interface modules (TIMs) are multiplexed and demultiplexed with common equipment through the use of mapping RAMs contained in each TIM. The common equipment provides identical addresses to each of the mapping RAMs in the TIMs. T... | 03/09/1982 |
| 4319353 | Priority threaded message burst mechanism for TDMA communication To make the most efficient use of the TDMA frame for a satellite communications network, the assignment of each local station's TDMA burst duration is based on a statistical assessment of the demand by local voice and data ports. Occasionally the actual v... | 03/09/1982 |
| 4309764 | Technique for increasing the rain margin of a satellite communication system The present invention relates to a technique for increasing the rain margin at ground stations of a satellite communication system. In the present technique, spare TDMA time slots in each frame sequence are shared among all ground stations as required by ... | 01/05/1982 |
| 4298979 | Decoding TIM bus structure A multiplexing/demultiplexing bus structure for a TDMA communications system employs a mapping RAM in common equipment and a decoding device in a plurality of interface modules. The common equipment provides identical encoded information to each of the de... | 11/03/1981 |
| 4287588 | Multiple access, time-division multiplex, satellite communications system A multiple-access, time-division multiplex, satellite communications system n which the uplink and downlink frequencies are the same. In each ground station, the outgoing information (be it data, encoded data or digitized samples of the voice frequency signals)... | 09/01/1981 |
| 4285064 | TDMA Satellite communication system A time division multiple access satellite communication architecture is disclosed to achieve a relatively simple control procedure for permitting multiple computers to establish peer coupled transmission paths for high speed transfer by dynamically alloca... | 08/18/1981 |
| 4232197 | Processor for a TDMA burst modem The present invention provides a processor for interfacing a TDMA burst modem (40), which transmits and receives bursts of information at high data rates in assigned time slots, and slow speed terminal processing equipment. The present processor comprises... | 11/04/1980 |
| 4201892 | Multi-rate TDMA communication system A multi-rate TDMA communication system includes a baseline TDMA network and at least one auxiliary TDMA network oprating through the same satellite repeater. The baseline and auxiliary networks may each include a plurality of ground stations, the baseline... | 05/06/1980 |
| 4147894 | Time division multiplex communication device comprising a switching matrix between C/E buffers and control circuits Like a conventional time division multiplex communication device, a device according to this invention comprises first terminals, a switching matrix, transducers or C/E buffers, control circuits, and second terminals. The first and second terminals are fo... | 04/03/1979 |
| 4115661 | Single channel per burst TDMA multiple transponder network A time division multiple access (TDMA) communication system has a plurality of geographically separated stations including a first group of stations, each of which can communicate with any other station in the first group through a first transponder in a ... | 09/19/1978 |
| 4028497 | Acquisition technique for time division multiple access communication system An initial acquisition technique for a time division multiple access (TDMA) communication system, employing an access signal of a frequency varying periodically in a predetermined relation to the TDMA time frame. Means are provided for detecting when the ... | 06/07/1977 |
| 4009347 | Modular branch exchange and nodal access units for multiple access systems Modular digital exchanges linked by earth satellite provide coordinated time division switching and time compressed communication services relative to externally attached telephone and data (user) trunks. Branch exchange modules (NCU's) perform call switc... | 02/22/1977 |
| 4009345 | External management of satellite linked exchange network Digital exchange terminals are linked by earth satellite and terrestrial point-to-point time division trunks in a privately coordinatable time division switching and communication network serving to connectively link multiple ports attachable to separate ... | 02/22/1977 |
| 4009344 | Inter-related switching, activity compression and demand assignment Digital exchange terminals are linked by earth satellite in a privately coordinatable time division switching and communication network system serving multiple voice telephone and data communication lines. Terminals operate in each satellite time division... | 02/22/1977 |
