Patents Examined by Roberta Stevens
  • Patent number: 6816491
    Abstract: A multiplexed audio data decoder apparatus is provided in which integration of an audio decoder is easy, and has a high flexibility when the number of the formats to be processed is increased or when the specification is changed. In an external ROM 60 there are accumulated a plurality of decoding program codes corresponding to respective plural methods for compressing and encoding. A controller means 50 transfers the decoding program code corresponding to the method for compressing and encoding after changing thereof, from the external ROM 60 to an internal RAM 25. A DSP 22 starts decoding processing by using the decoding program code which is transmitted into the internal RAM 25.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: November 9, 2004
    Assignees: Hitachi, Ltd., Hitachi Video and Information Systems, Inc.
    Inventors: Yukio Fujii, Shinichi Obata, Hiroaki Shirane, Eiji Yamamoto
  • Patent number: 6804230
    Abstract: A communication device which includes a hardware trie search facility. At least part of a memory is divided into memory blocks, each of said blocks consisting of a multiplicity of locations, at least some of said locations each providing when accessed a pointer to another block and an indication of the size of the block. A shift register holds an address key, and a trie block is accessed using an address composed of a number of bits related to said indication of the size of the block. The key is shifted by said number of bits prior to a subsequent stage of the search. Part of the memory comprises an associated data table which includes entries of data enabling a packet to be forwarded and at least some locations in said blocks provide when accessed a pointer to an entry in the associated data table.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: October 12, 2004
    Assignee: 3Com Corporation
    Inventors: Kevin Jennings, Edele O'Malley, Sorcha O'Callaghan, Kevin Loughran
  • Patent number: 6804257
    Abstract: A method and a system for framing variable-length packets in a data communications system are disclosed. The successive variable-length packets carrying users' data, are formed in a stream of chained packets comprising a header. Two CRC's are computed. One over the data and another one over the header however, including also the data CRC of the immediate previous packet, thus chaining successive packets in a steam of such packets. The invention also assumes that encryption is performed independently over header and corresponding CRC's and, on the other hand, over the data of current packet. The invention allows to better adapt the transportation of multi-media users' data in packets of variable-lengths while securing transport by chaining successive packets, thus preventing that accidental or malicious deletion and insertion of packets occur and remain undetected.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: October 12, 2004
    Assignee: International Business Machines Corporation
    Inventors: Alain Benayoun, Patrick Michel, Jean-Francois Le Pennec, Gilles Toubol
  • Patent number: 6804206
    Abstract: The invention relates to a radio communication system in which secondary stations (110) can request services from a primary station (100) using a random access channel employing a time division multiple access protocol, An access request comprises an access packet (200) having a predetermined maximum data capacity. If a secondary station requires to transmit an access request including more payload data (202,206) than can be accommodated in a single access packet the data is subdivided into a plurality of parts each of which is transmitted in a separate access packet. The primary station combines the data from the plurality of access packets (200) forming the access request, and issues an acknowledgement to the secondary station.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: October 12, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Timothy J. Moulsley
  • Patent number: 6801530
    Abstract: An Internet Protocol network having service differentiation depending on whether or not a flow in the network is a real-time flow. An aggregated flow within the Internet Protocol network passes through a flow classifier before entering a node. The flow classifier distinguishes the aggregated flow into set of flows, each flow corresponding to a unidirectional packet stream from a single session. The flow classifier then executes at least one of a plurality of checks including: checking payload size; checking for static behavior in header fields that are predictably constant if the flow is a real-time flow; and checking for incremental behavior of header fields, which predictably increment if the flow is a real-time flow. Based on the checks, the flow classifier decides whether the flow is a real-time flow or a non-real-time flow.
    Type: Grant
    Filed: September 18, 2000
    Date of Patent: October 5, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Harald Brandt, Zsolt Haraszti, Rui Castro
  • Patent number: 6778543
    Abstract: The invention concerns a method of controlling the synchronization in a data packet communication network (10) having at least two serial communication buses (D, E) interconnected by a bridge (PDE) and each defining successive time cycles each having a duration specific to the said bus under consideration, the said method having the following steps: detection (C3, C4) of a relative drift between the respective cycles of the said at least two serial communication buses, transmission (C10, C12; C18, C17) of a command for modifying the duration of the cycle of one of the said at least two serial communication buses, characterised in that the said method includes at least one delay phase (C6, C7; C2, D1, D2) before at least one of the preceding steps.
    Type: Grant
    Filed: March 13, 2000
    Date of Patent: August 17, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Laurent Frouin, Jean-Paul Accarie, Yacine Smail El Kolli, Falk Tannhauser
  • Patent number: 6775238
    Abstract: In an image forming device management system and method, a failure in any of a plurality of image forming devices on a first LAN is detected by a management apparatus. A failure message is transmitted from the management apparatus to a center system via a public switched telephone network when the failure is detected, the failure message including a failure code provided to identify the failure. The failure message, transmitted by the management apparatus, is received at the center system. A database of the center system is accessed by using the failure code of the received failure message so as to produce results of the accessing at the center system. A service department ID is extracted from the database based on the accessing results. A service request message is transmitted from the center system to a service department indicated by the service department ID.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: August 10, 2004
    Assignee: Ricoh Company, Ltd.
    Inventor: Koubun Suzuki
  • Patent number: 6775285
    Abstract: There is disclosed an interworking function unit for transferring data between a wireless network and an Internet protocol (IP) data network coupled to the wireless network. The interworking function unit comprises a protocol conversion controller that receives incoming data packets from the wireless network, wherein the incoming data packets are generated by a first mobile station and are formatted according to a protocol associated with the wireless network. The interworking function unit converts the incoming data packets to IP data packets formatted according to an Internet protocol of the IP data network. The interworking function unit also comprises a first security controller for preventing unprovisioned mobile stations from accessing the IP data network through the wireless network. The first security controller receives the IP data packets and replaces each original IP packet header with a replacement IP packet header containing the IP address of a provisioning server.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: August 10, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Bryan J. Moles, Sudhindra P. Herle
  • Patent number: 6771653
    Abstract: A system for providing prioritized queue management within a data transmission network node that supports different types of data frame traffic is disclosed herein. The system includes a frame buffer for storing an incoming frame that has an identifiable frame type. A queue is pre-associated with the frame type of the incoming frame such that upon arrival of the frame at the network node, the queue stores a location address at which the frame is stored within the frame buffer such that the frame is maintained within the queue. The queue that contains the frame is stored within a frame table. Processing means are provided for determining a time at which the queue forwards the frame from the frame buffer in accordance with a pre-determined sub-queue priority list. The system further includes time metering means associated with the frame for temporally assigning the frame to a virtual sub-queue among multiple virtual sub-queues that are associated with the queue.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: August 3, 2004
    Assignee: International Business Machines Corporation
    Inventors: Jean-Francois Le Pennec, Jacques Fieschi, Aline Fichou, Claude Galand
  • Patent number: 6771622
    Abstract: An example application of the invention is directed to a mobile receiver searching pilot signals in a CDMA-based radiotelephone communications system. The receiver processes received pilot signals by first decimating those pilot signals that have a search window length that is greater than a threshold number of chips, into a plurality of sub-windows. The other pilot signals and the sub-windows are then searched using a common prioritization criteria. More specific implementations of this approach permit each search of this type to take a fixed amount of time, thereby making scheduling calculations easy to implement. Moreover, such implementations provide for all pilots to be searched equally often irrespective of window sizes, and for less likely candidates for idle handoff (pilots with longer window sizes) not to be given precedence over more likely idle handoff candidates.
    Type: Grant
    Filed: November 17, 2000
    Date of Patent: August 3, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Debarag N. Banerjee
  • Patent number: 6765910
    Abstract: A system (10) for communicating information includes a connecting link (50) to communicate ATM cells. A first switching system (14) receives ATM cells for at least first and second virtual circuits using a first link (20) and communicates ATM cells for the second virtual circuit using the connecting link (50). A second switching system (14) receives ATM cells for at least the first and second virtual circuits using a second link (20) and communicates ATM cells for the first virtual circuit using the connecting link (50). The first switching system (14) receives the ATM cells for the first virtual circuit from the second switching system (14), using the connecting link (50), and sequences all ATM cells for the first virtual circuit using first IMA functionality (80).
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: July 20, 2004
    Assignee: Intel Corporation
    Inventor: Brian W. Johnson
  • Patent number: 6763013
    Abstract: The mobile ad hoc network includes a plurality of wireless mobile nodes and a plurality of wireless communication links connecting the nodes together. The nodes advertise using variable beacon signals. The method includes neighbor discovery with beacon signal detection. The method includes searching for the variable beacon signals at a given mobile node using an initial detection rate and at an initial detection frequency, and increasing a detection rate from the initial detection rate up to a maximum detection rate while searching for the variable beacon signals at the initial detection frequency. The detection frequency may also be varied.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: July 13, 2004
    Assignee: Harris Corporation
    Inventor: Robert A. Kennedy
  • Patent number: 6757293
    Abstract: The present invention provides an improved RACH access burst arrangement and frame structure. That is, the invention provides methods and apparatus for supporting more than one access burst length in the UMTS access channel structure. Preferably, two access burst lengths are supported, e.g., 5 ms and 10 ms. Such an arrangement is advantageous in applications where it is beneficial to have fast access latency such as, for example, voice or other forms of real-time traffic. Also, the invention provides methods and apparatus for supporting multiple frame sizes. It is to be appreciated that further enhancement to access latency can be obtained by having the UMTS physical layer support multiple frame sizes. The access burst signal transmitted by a remote terminal over the RACH may be an access request or data packets in the case where the RACH is being utilized for UMTS short message services.
    Type: Grant
    Filed: December 2, 1998
    Date of Patent: June 29, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Mooi Choo Chuah, On-Ching Yue, Qinqing Zhang
  • Patent number: 6757303
    Abstract: A communication device comprises reception means for receiving externally supplied first time information representing time, time information generation means for generating second time information representing time, time difference detection means for detecting a time difference between the times represented by the received first time information and the second time information generated at a time point at which the first time information is received, and correction means for correcting the second time information generated by said time information generation means based on the received first time information when the time difference is greater than a predetermined value.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: June 29, 2004
    Assignee: Yamaha Corporation
    Inventors: Takeshi Kikuchi, Yuji Koike
  • Patent number: 6754174
    Abstract: An interface for communications among network elements of at least one network is provided, comprising at least one transmitter, at least one receiver, at least one processor, and at least one backplane coupled among the network elements. Data frames of a second type, or Time Slot Network (TS Net) data frames, are generated and transferred over the backplane in response to receipt data frames of a first type from the network. The TS Net data frames comprise switching event information. Compare operations are performed among prespecified TS Net data frames at prespecified intervals, and at least one interrupt signal is generated in response to data changes determined by the compare operations. Information routing is controlled over the network by a processor in response to the interrupt signal.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: June 22, 2004
    Assignee: Ciena Corporation
    Inventors: Raanan Ben-Zur, Steven L. Shepherd, Boris Reynov, Bayne G. Steele, Nicholas A. Balatoni
  • Patent number: 6741560
    Abstract: In ATM connections, a number of connections are usually transmitted over common connecting segments. Potentially newly added connections are allowed based on the measure of decisions made by acceptance algorithms. Knowledge of the momentarily reserved bandwidth is estimated step-by-step with the setup or release of connections.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: May 25, 2004
    Assignee: Siemens Aktiengesellschaft
    Inventor: Eugen Wallmeier
  • Patent number: 6728225
    Abstract: A wireless communications system employs code-division multiple access information transmission techniques where the uplink and downlink transmission bandwidths are unequal. The higher bandwidth is an integer multiple of the lower bandwidth. The present system requires a base station and a subscriber unit to have two pseudo-random code generators which can be clocked separately. Alignment of the uplink and downlink pseudo-random spreading codes is achieved by truncating the code sequence for the lower speed link at the conclusion of a complete code sequence for the higher speed link.
    Type: Grant
    Filed: February 10, 2000
    Date of Patent: April 27, 2004
    Assignee: InterDigital Technology Corporation
    Inventor: Fatih Ozluturk
  • Patent number: 6724766
    Abstract: A method and arrangement for prioritized transmission of packets from a plurality of storage queues, each interfacing one corresponding input bitstream to one common transmission medium, is disclosed, whereby the respective queue priorities, on the basis of which access to the common transmission medium is determined, are itself dependent upon respective weigths associated to the corresponding input bitstreams. This dependency on these respective weight; relates to a respective amount of successive values of these respective queue priorities, to be selected from an arbitrary interval and sorted in a predetermined sequence.
    Type: Grant
    Filed: June 4, 1998
    Date of Patent: April 20, 2004
    Assignee: Alcatel
    Inventor: Herman Michiel
  • Patent number: 6724743
    Abstract: A method of conjoint detection of a set of CDMA codes received at a plurality of antennas of a receiver like a mobile telephone receiver. The codes are transmitted via a transmission channel with transfer matrix A satisfying the equation e=A.d+n, where d is the set of symbols of the codes transmitted, n is an additional noise vector and e is the set of received samples.
    Type: Grant
    Filed: May 2, 2000
    Date of Patent: April 20, 2004
    Assignee: France Telecom
    Inventor: Yvan Pigeonnat
  • Patent number: 6707789
    Abstract: Flexibility is achieved in provisioning communication rings with an integrated DCS that allows any port that is connected to a line interface unit within the integrated DCS to be coupled within the integrated DCS—pursuant to software controlled provisioning—to any other port that is connected to a line interface unit within the integrated DCS. This is accomplished by merging the cross connect fabrics of the ADM portions of the integrated DCS with the cross connect fabric of the DCS portion of the integrated DCS, by incorporating at least some of the switching controls of the ADMs in the ADM portion of the integrated DCS in the controller of the DCS, and by insuring that the SONET K-bytes can be passed by the controller of the flexible integrated DCS from any line interface unit to any other line interface unit.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: March 16, 2004
    Assignee: AT&T Corp.
    Inventors: Ahmet Vecdet Arslan, Bruce Gilbert Cortez, Sid Chaudhuri