Patents Examined by Benedict V. Safourek
  • Patent number: 5757785
    Abstract: A multi-directional multiple access communication system includes a master station and subscriber stations including a specific subscriber station. The system performs communications using a demand assignment scheme in which time slots are assigned between the subscriber and master stations only when a call is generated by a subscriber station. The master station includes a first transmission/reception section, a rate conversion circuit, a second transmission/reception section, a memory, and a distribution circuit. The first transmission/reception section performs multi-directional multiple access communication of a time slot signal with each subscriber station excluding the specific subscriber station via a first transmission path. The rate conversion circuit converts a time slot signal into a signal having a transmission rate lower than that of the first transmission path.
    Type: Grant
    Filed: January 29, 1996
    Date of Patent: May 26, 1998
    Assignee: NEC Corporation
    Inventor: Shigeru Sugihara
  • Patent number: 5757783
    Abstract: A system and method for routing ATM cells in a wireless ATM local area network (LAN) that use portable base station (PBS) switching nodes. Routing of cells to and from mobile users within the network is accomplished utilizing a novel routing scheme which preserves cell sequence. Each user transmitting data to another user is associated with a Source Home Station or node and each user receiving data is associated with a Destination Home Station or node. When a connection is established in the network between a first mobile user and a second mobile user, the ATM cells are routed along a fixed path from the first mobile user to the associated Source Home Station and along a fixed path between the Source Home Station to the Destination Home Station and then along a fixed path from the Destination Home Station to the second destination user. In this way cell sequence is maintain by utilizing the Source Home to Destination Home path.
    Type: Grant
    Filed: June 15, 1995
    Date of Patent: May 26, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: Kai Yin Eng, Mark John Karol, Malathi Veeraraghavan
  • Patent number: 5757779
    Abstract: A automatic skywave communications system includes a control channel and one or more traffic channels for voice or data communications. The system automatically establishes and maintains traffic radio links. The system measures, reacts, signals and adapts system parameters.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: May 26, 1998
    Assignee: Rockwell International Corporation
    Inventors: Charles D. Young, Daniel O. Weddle, Mel G. Bebee
  • Patent number: 5757804
    Abstract: A data communication device (500) which is capable of providing inverse multiplexing, avoids having to perform address offset calculations by storing the incoming data from each of its incoming data channels in corresponding data buffers having predefined data structures which eliminate the need for offset calculations during data transfers and protocol processing. The communication device (500) compares the actual address location that a particular byte, such as a frame count byte, is presently stored in the data buffer and the address location it should be stored in order to avoid using offset calculations. If the actual location the frame count (FC) byte is located in is not the desired location the frame count byte should be located, the communication device (500) programs its SCCs (508, 510) to commence storing subsequent data bytes in the appropriate address locations in each of the data buffers found in memory (538) so as to avoid having to perform offset calculations during memory accesses.
    Type: Grant
    Filed: July 5, 1996
    Date of Patent: May 26, 1998
    Assignee: Racal-Datacom, Inc.
    Inventor: Mitchell G. McGee
  • Patent number: 5757802
    Abstract: In the data encoding/decoding method according to the MPEG (Moving picture Expert Group) system, the audio/video bit stream interleaving method includes a first step of determining as to whether a PTS (Presentation Time Stamp) is present in audio/video packets so as to estimate the PTS from a preceding packet in the absence of the PTS, a second step of comparing the audio packet with the video paket in the PTS to output one of the packets which has smaller PTS value, and a third step of multiplexing the audio or video packet to form an audio/video bit stream, so that the decoder is prevented from the overflow or underflow pheonomena in consideration of the decoding time within the audio/video packet data decoding time.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: May 26, 1998
    Assignee: LG Electronics Inc.
    Inventor: Jea Yong Yoo
  • Patent number: 5757787
    Abstract: A method and apparatus of communicating information using Time Division Multiple Access and adaptive transmission and reception are disclosed. Signal bursts are transmitted from TDMA transmitters to a TDMA receiver wherein the transmitter codes the information and transmits coded information to the receiver using at least one of two timeslots of a plurality of timeslots in a repetitive TDMA frame period. Both of the two timeslots are received whether or not the transmitter has transmitted using one or two timeslots and the received signals are classified as intended and non-intended. Successively received signals classified as intended are then assembled into a block for decoding to reproduce the information.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: May 26, 1998
    Assignee: Ericsson Inc.
    Inventor: Paul W. Dent
  • Patent number: 5754548
    Abstract: In a local communication system comprising a number of devices (14,16) interconnected by a first data bus (20) supporting a first set of communication protocols, and at least one further device (10) connected to a second bus (12) not supporting those protocols, a gateway device (18) is provided linking the first and second data buses enabling communications therebetween. The first set of protocols specifies a maximum time for response by a first device to a request sent by a second device. When a request is sent from a device (14) on the first bus to the further device (10), the gateway (18) times the request and, if no response is received from the further device within the specified maximum response time, the gateway (18) generates and sends a temporary response to the requesting device (14). The system may comprise two or more clusters of devices, each being linked to the further bus (12) by respective gateway devices (18,22).
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: May 19, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Jelle Hoekstra, Bernard Van Steenbrugge
  • Patent number: 5754547
    Abstract: Routing methods, using an Internet protocol, which allows free alteration of the connection of a terminal between subnetworks such as local area networks (LANs) without necessitating modification of IP (Internet Protocol) addresses. The subnetworks are unified to constitute a network by a plurality of routers and each router is provided with a table which stores information according to every router indicating terminal addresses and times of connection to the network for every terminal included within the network. When a terminal is connected to any one of the subnetworks, the router corresponding to that subnetwork both updates the content of the table incorporated in that router and communicates to other routers the address and connection time of the connected terminal by means of a subscriber signal.
    Type: Grant
    Filed: April 26, 1996
    Date of Patent: May 19, 1998
    Assignee: NEC Corporation
    Inventor: Fumio Nakazawa
  • Patent number: 5751972
    Abstract: A system which enables new data paths that form different network configurations to be constructed during the run time of the computer determines whether a given configuration specified by a user is legitimate, and if so, creates a data path. In operation, a user issues a command to open a data path containing a particular protocol module. In response, an open handler inquires whether the particular configuration specified by the user is proper. This inquiry is sent to individual configurators, which comprise shared libraries containing routines pertaining to the various protocols stored in the computer. A configurator responds to the inquiry if it contains information pertaining to the protocol identified by the user. The routines in the configurator also indicate whether the protocol module can be connected in a legitimate configuration. If it can, a data path is created.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: May 12, 1998
    Assignee: Apple Computer, Inc.
    Inventors: Michael Quinn, Michael B. Shoemaker
  • Patent number: 5751694
    Abstract: A method and apparatus for dynamically synchronizing a plurality of streams of temporally related data generate compression time information regarding the time required to compression a first stream of data. The compression time information is transmitted together with the first and other compressed streams of data, and is utilized to delay at least one decompressed compressed stream of data to thereby synchronize such decompressed stream with a decompressed compressed first stream of data. The decompression time information is determined by selecting, from a look-up table, a delay time corresponding to the compression time information.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: May 12, 1998
    Assignees: Sony Corporation, Sony Electronics Inc.
    Inventor: Rolf Toft
  • Patent number: 5751700
    Abstract: A communication terminal apparatus for multiplexing a plurality of different types of data and for performing communications using the multiplexed data includes a network control unit connected to a communication network for transmission and reception of the plurality of different types of data. A multiplexing unit generates transmission data by multiplexing the plurality of different types of data and outputs the transmission data to the line control unit. A synchronizing unit generates a transmission synchronizing signal of the multiplexing unit. A separating unit separates reception data received from the network control unit in units of data type synchronously with the transmission synchronizing signal generated by the synchronization unit. A loop back path can be used for looping back and inputting the separated reception data to the multiplexing unit, and an adding unit adds dummy data to the looped back reception data.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: May 12, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventor: Eiji Imaeda
  • Patent number: 5748610
    Abstract: A wireless OCDMA communication system in which there is a cluster of base stations (BS), or radio fixed parts (RFP), which may in turn be controlled by a wireless cluster controller (WCC). The system uses frames of a time division duplex spread spectrum signal for two-way voice and/or data transmission, and a plurality of handsets, portable parts (PPs), or more complex subscribers, each adapted to communicate with the BS, or RFP, using the communication system, can be used to implement a variety of system configurations and provide a variety of at least two levels of service selected from a wide variety of services.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: May 5, 1998
    Assignee: Stanford Telecommunications, Inc.
    Inventors: Herman A. Bustamante, Horen Chen
  • Patent number: 5748621
    Abstract: In a digital mobile communication system comprising a cell station and a plurality of personal stations and employing a TDMS-TDD method, a personal station which is going to originate a call in a transceiver mode detects a unique word contained in a signal being transmitted from a control slot or communication slot by a busy personal station or cell station, recognizes the timing of the receiving slot and the receiving frame in view of the position of the unique word and controls to synchronize the timing of its own slot and frame with the aforementioned timing. A personal station which is to start a personal station-to-personal station direct communication can determine a communication slot after establishing complete synchronization with the busy personal station or cell station, and can improve the efficiency of using a frequency by eliminating time when a communication cannot be made.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: May 5, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Atsushi Masuda, Takahiro Endo
  • Patent number: 5748629
    Abstract: An ATM network switch and method of utilization for adaptively providing integrated services therein is disclosed. In providing such integrated services, if the allocated bandwidth for one connection has been consumed, or if the connection is not entitled to allocated bandwidth, the connection can optionally use dynamic bandwidth arbitration, or a combination of both allocated and dynamic. The switch includes an input port processor, a bandwidth arbiter, and an output port processor. Cells are transmitted from the input to the output, under the control of respective port processors and the bandwidth arbiter. Flow control is implemented on a per-connection basis. Individual queues are then assigned to traffic type groups in order to provide traffic type flow control. Based upon prioritization information associated with the cell at the input, cells are prioritized and transmitted from the output, with each cell maintained in the same order, relative to other cells on a connection, in which it was received.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: May 5, 1998
    Assignees: Fujitsu Networks Communications, Inc., Fujitsu Limited
    Inventors: Stephen A. Caldara, Stephen A. Hauser, Thomas A. Manning, Robert B. McClure, Matthias L. Colsman
  • Patent number: 5745482
    Abstract: In a repeating device for sending chargeable satellite broadcasting received through a BS antenna to a connected cable, a scrambled video signal and an audio signal are separated from each other by a separation part from a satellite broadcast signal. Relevant information packets multiplexed upon the audio signal are separated from each other by a separating part, and common information packets of the relevant information packets are separated from each other by another separation part. Common information packets which are successively sent five times are judged in majority by a majority judgement part. Packets having errors corrected by an error correction part are temporarily stored in a buffer memory. The stored packets are read out three times by a thrice successive sending part wherein the stored packets are successively sent fewer times than the number of times the packets are sent from from an atmospheric transmission system.
    Type: Grant
    Filed: July 3, 1995
    Date of Patent: April 28, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masaaki Nishiura, Shinichi Ooi
  • Patent number: 5740159
    Abstract: A loopback mechanism uses frame relay OAM loopback frames which eliminate the need for location identifiers and reduces overhead and complexity. The frames replace source and destination loopback location identifiers by a loopback indicator field, a send node count field and a return node count field. The originating node of the loopback procedure sets the number of intermediate frame relay nodes to be traversed. The intermediate frame relay nodes simply increment or decrement the node count, depending on the direction of the loopback frame.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: April 14, 1998
    Assignee: Northern Telecom Limited
    Inventors: Khalid Ahmad, Jan Medved
  • Patent number: 5740163
    Abstract: The disclosure concerns a dual-mode ISDN/STN visiophone terminal, including at least one audio equipment and one video equipment respectively connected to an ISDN via a dual-mode ISDN/STN audio coder/decoder incorporating an ISDN audio coder, an ISDN audio decoder, an STN audio coder and an STN audio decoder, and via a dual-mode ISDN/STN video coder/decoder incorporating an ISDN video coder, an ISDN video decoder, an STN video coder, and an STN video decoder, wherein in order to provide an answering/recording function in said visiophone terminal a RAM memory is used to store audiovisual messages in STN mode, and wherein the outputs of the ISDN audio and video decoders are connected respectively to the inputs of the STN audio and video coders in order to record in the RAM an audiovisual message sent by a calling party via a remote terminal, and wherein the outputs of the STN audio and video decoders are connected respectively to the inputs of the ISDN audio and video coders in order to send an audiovisual mess
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: April 14, 1998
    Assignee: Thomson-CSF
    Inventor: Philippe Herve
  • Patent number: 5740158
    Abstract: An ATM communication system including a plurality of communication nodes connected in a loop form by buses, buffers disposed in each communication node, a synchronizing pulse generation circuit for conducting cell demultiplexing of all communication nodes at the same timing, storage devices disposed in each communication node to store mounting position information of the communication node and slot generator position information, and a circuit used by each communication node to automatically transmit and receive cells on the basis of position information described above.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: April 14, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Kaoru Aoki, Masataka Takano, Junichirou Yanagi, Tetsushi Nakano, Miho Iino
  • Patent number: 5737330
    Abstract: A technique for optimizing throughput on a communications channel shared by multiple users. A communications channel that must be shared by a large number of devices has the potential of being very inefficient because of collisions or overlapping of transmissions by the various devices. The system combines a carrier sense, multiple access (CSMA) mode with a time division multiple access (TDMA) mode to achieve a channel utilization greater than 90 percent. The remote units send a poll request to a base station using the CSMA mode and receive a poll signal from the base station with a poll sequence. The remote units send their data in their assigned time slot. The remote units do not have to all be in radio contact with each other to maintain synchronization. Each remote unit selects the base station that it wishes to communicate with based on signal strength of various base stations.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: April 7, 1998
    Assignee: Meteor Communications Corporation
    Inventors: Richard J. Fulthorp, Dale K. Smith, David A. Fulthorp, Thomas G. Donich
  • Patent number: 5737332
    Abstract: A data link control method including receiving a message (30) for transmission over a cable communications system. The method determines a number of octets in the message (30). When the number of octets is less than or equal to a predetermined number of octets, the method sets a frame length (44) equal to the number of octets and transmits a frame (180) containing the message (30). When the number of octets is greater than the predetermined number, the messages (30) is segmented (32-42), each segment being identified in order with respect to the other segments. The method thereby provides for graceful communications resumption when the transmission of a message is interrupted before completion.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: April 7, 1998
    Assignee: Motorola, Inc.
    Inventors: Richard J. Corrigan, Camille Dozier, Rachel Baumann, Scott Chu, Kurt Steinbrenner, David Ingham