Abstract: According to one embodiment, an optical disc apparatus includes a calculation unit that calculates a tilt of a disc, a determining unit that determines whether or not the tilt of the disc calculated by the calculation unit is larger than a preset predetermined reference value, and a correction unit that corrects the tilt of the disc calculated by the calculation unit.

Abstract: A position verifying apparatus is provided with: a first recording device for recording the information into a first area of the first recording layer; a second recording device for recording a part of the information by laser light which has penetrated the first area and for recording another part of the information by laser light which does not penetrate the first area, into a second area of the second recording layer including at least a partial area which faces the first area; a reproducing device for reproducing the information; and a judging device for judging whether or not the relative shift is within tolerance, on the basis of a transit position at which reproduction quality transits from the reproduction quality indicated by the part of the information reproduced to the reproduction quality indicated by the another part of the information reproduced.

Abstract: The present invention relates to a method of writing data on a master substrate (10) for optical recording, the master substrate comprising a recording layer (12) and a substrate layer (14), and the recording layer comprising a phase-change material the phase of which can be transferred from crystalline to amorphous by projecting light on the recording 5 layer, the method comprising the steps of: writing a first amorphous mark (32) from a plurality of amorphous marks on the master substrate by at least one write pulse, and providing a cooling gap before the next amorphous mark (32) will be written.

Abstract: An information storage medium which stores data structures supporting multi-angles includes clip AV streams for respective angle data of multi-angle motion picture data. As additional information for each clip AV stream, clip information is recorded on a separate storage area from that of the clip AV streams. The clip information includes jumping-point information for jumping into another angle. Each of the clip AV streams may be recorded in a contiguous recording area, or divided into smaller interleaved units that are interleaved with units of the other clip AV streams.

Abstract: The data transfer apparatus includes a recording unit which records image files on a first recording medium, a communication unit which communicates with a recording apparatus which records an image file on a second recording medium, and receives medium information associated with the second recording medium from the recording apparatus, a search unit which searches a plurality of image files recorded on the first recording medium for image files which are recordable on the second recording medium, based on the medium information, and a display control unit which displays representative images of the plurality of image files recorded on the first recording medium, and the display control unit displays, together with the representative images, information indicating a range of image files recordable on the second recording medium of the plurality of image files recorded on the first recording medium, based on a search result of the search unit.

Abstract: The present invention is to provide a method to be used on an electronic device, which employs the demultiplexing process to divide the data streams from video file compatible with DVD read/write formats, or video file from several DVD disks; into several independent and separate files; the data streams include audio, video, and subtitle; subsequently, the data streams that include audio, video, and subtitle are subject to the multiplexing process in accordance with UDF 2.50 or UDF 2.60 formats, in order to combine the data streams into a new video file.

Abstract: An object of the present invention is to retrieve and process a piece of content to be processed by a simple method at the time of storing content recorded in a CD into an HDD or the like, reading desired content out of the content stored in the HDD from the HDD, and performing a process such as reproduction on the read content. A processor of the invention includes: a storage 1 for storing at least one piece of information so as to be associated with jacket image information of an image related to the content; means for obtaining target medium image data by capturing an image of a jacket of a CD related to the content to be reproduced; means for collating the target medium image data with jacket image information stored in the storage 1 and obtaining the content corresponding to the target medium image data from the storage 1; and means for reproducing the obtained content.

Abstract: A recording medium (100) is provided with a first recording layer (L0) and a second recording layer (L1) for recording information. The first recording layer and the second recording layer are provided with control areas (102, 118), respectively, for recording control information for controlling at least recording or reproduction of the recording information. An area portion of the second recording layer which corresponds to an end portion on an inner circumference side of the control area in the first recording layer, and an end portion on an outer circumference side of the control area in the second recording layer are separated by a prescribed value or more.

Abstract: An optical disc apparatus has a structure including: a storage medium; a readout portion that reads out data from at least one Defect Management Area (DMA) or at least one group of the DMAs which is included in a Blu-ray Disc REwritable (BD-RE); a storing portion that stores one of the data which is read out by the readout portion, in the storage medium; an erasing portion that erases the data which is read out by the readout portion, from the at least one DMA or the at least one group of the DMAs; and a recording portion that records the data which is stored in the storage medium, in at least one DMA or at least one group of the DMAs which is included in BD-RE.

Abstract: Techniques are described that can be used to store information onto a holographic storage medium. Techniques are described that can be used to access information from a holographic storage medium. Multiple beam sources and multiple detectors can be used to store and/or read information. At least one detector can be available to read information available from a beam reflected from the medium. Multiple read and/or write operations may take place at substantially the same time.

Abstract: Provided are a holographic information recording/reproducing apparatus in which positions of books can be accurately ascertained in a holographic recording medium, and a method for seeking books in the same. The apparatus includes an aperture plate disposed in an optical path of a signal beam reproduced from a reference beam that is incident on a holographic recording medium, and having an opening for restricting a width of the signal beam; one or more photodetectors installed on a surface of the aperture plate along a circumference of the opening; and a book position calculator to calculate positions of one or more books from the output of the photodetectors, wherein a cross-section of the reference beam incident on the holographic recording medium is larger than the size of the one or more books.

Abstract: A diffraction element is disposed between a beam branching element (such as a beam splitter) and a photodetector. The diffraction element further segment an interference fringe introduced into stray light by a diffraction grating which divides a laser beam emitted from a laser beam source into a main beam and two sub-beams.

Abstract: An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a first light source for emitting first light flux having a first wavelength; a second light source for emitting second light flux having a second wavelength, the first wavelength being different from the second wavelength; a converging optical system having an optical axis and a diffractive portion, and a photo detector; wherein in case that the first light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the first light flux is greater than that of any other ordered diffracted ray of the first light flux, and in case that the second light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the second light flux is greater than that of any other ordered diffracted

Abstract: When an optical information recording/reproducing apparatus receives a request for accessing to an optical information recording medium from a host computer, an optical pickup unit reads an access-restriction code that is recorded on a ROM data-layer of the optical information recording medium, a comparing unit compares the read access-restriction code with a key unique-code that is recorded on an IC card, and a controller determines whether accessing to the optical information recording medium is allowable based on a result of the comparison.

Abstract: The optical pickup device according to the present invention includes: a light source which emits a first light at a first wavelength, a second light at a second wavelength and a third light at a third wavelength; an optical path combining unit which combines vectors of the first, second and third light emitted by the light source, and matches optical axes of the first light and the third light; a light collection unit which condenses the light from the optical path combining unit into the optical information storage medium; a diffraction element which diffracts reflected light from the optical information storage medium; a first photo detector, a second photo detector and a third photo detector which receives the diffracted light from the first diffraction element; and a prevention unit formed between the first diffraction element and the first photo detector, the second photo detector and the third photo detector, and which prevents irradiation of + first-order diffracted light diffracted by the first diffr

Abstract: A coupling lens for chromatic aberration correction is placed between a light source and an objective lens for focusing light beams with a plurality of wavelengths on an information recording surface of an optical recording medium, and at least one surface of the coupling lens includes a plurality of annular zones having a step concentric with an optical axis. The coupling lens is designed so that when a wavelength ?1=380 to 430 nm and a height of the step is d=m1?1/(n1?1) where m1 is an actual number and n1 is a refractive index of the coupling lens at the wavelength ?1, 9.9?m1?10.1 is satisfied.

Abstract: An objective lens drive includes a lens holder holding first and second objective lenses and moved at least in a focusing direction substantially parallel to optical axes of the objective lenses and in a tracking direction orthogonal to the focusing direction; a support supporting the lens holder movably at least in the focusing and tracking directions; a first adjusting unit provided between the first objective lens and the lens holder and adjusting a tilt of the first objective lens in a direction about an axis in a first direction being any direction in a plane orthogonal to the focusing direction; and a second adjusting unit provided between the second objective lens and the lens holder and adjusting a tilt of the second objective lens in a direction about an axis in a second direction being in a plane orthogonal to the focusing direction and substantially orthogonal to the first direction.

Abstract: A multi-channel optical communication lens system, which is disposed between a plurality of arranged optical transmission lines and a plurality of photoelectric elements which is arranged facing respective ones of the optical transmission lines and transmit or receive optical signals, and which couples the optical signals between each of the optical transmission lines and each of the photoelectric elements thereto respectively, includes a first convex lens disposed at a location which makes the optical signals focus on end faces of the arranged optical transmission lines or a vicinity thereof, and a second convex lens disposed at a location which makes the optical signals focus on the photoelectric elements. Both of the first and second convex lenses includes an aspherical surface on one side thereof and a nonaxisymmetric aspherical surface on another side thereof.

Abstract: A recording and reproducing method has a recording pulse generating step of generating a recording pulse to set timing of a beam emitted from a laser according to data to be recorded on an information recording medium; a laser power control step of controlling a laser drive current according to a recording laser power; a beam detecting step of detecting a power of the beam emitted from the laser; a signal detecting step of detecting a signal level of a reproduction signal read out from the information recording medium; a step of binarizing the reproduction signal to generate a binarized signal; a step of generating a data signal synchronized with a reference clock signal with use of the binarized signal; and a step of detecting a shift in time interval between the binarized signal and the reference clock signal and feeding the shift back to the recording pulse.

Abstract: A data storage device using magnetic domain wall motion may include a first magnetic layer having a plurality of magnetic domains. A second magnetic layer may be connected to the first magnetic layer, and a connection layer may be disposed between the first and second magnetic layers. A resistive magnetic layer may be disposed between each of the first and second magnetic layers and the connection layer. Accordingly, when current is supplied to the data storage device to move a magnetic domain wall, the leakage of current in a connection between the magnetic layers may be reduced or prevented, thus conserving power.

Abstract: A storage apparatus includes carriages that are arranged in a matrix and store and transport objects, and a carriage shifting mechanism that is fixed to the storage apparatus and shifts the carriages.

Abstract: An optical recording medium having a track on which data has been previously recorded, comprising on the track a plurality of data block regions each of which includes main data of a block which is divided into a predetermined number of main data pieces, each of which has data for identifying the main data, and linking regions each of which has pseudo data and is inserted between the data block regions. When the linking regions on said track are adjacent, recording patterns of the pseudo data of the adjacent linking regions are different from each other. Further provided is a recording apparatus forming the data block regions and linking regions on a recording medium.

Abstract: One illustrative embodiment takes the form of a system for locating wireless transmitters employing an Orthogonal Frequency Division Multiplexing (OFDM) digital modulation scheme. The OFDM scheme comprises transmitting signal components over narrowband frequency channels spanning a wideband channel. The system includes a first receiving system configured to receive a fraction of the signal components transmitted by a first wireless transmitter to be located in a fraction of the narrowband frequency channels, and to process the fraction of the signal components to derive location related measurements. The system further includes at least a second receiving system configured to receive the fraction of the signal components transmitted by the first wireless transmitter, and to process this fraction of the signal components to derive location related measurements.

Abstract: A channel estimation method and apparatus based on two adjacent windows. The channel estimation method includes scanning a signal containing noise and channel impulse response (CIR) information with a first window and a second window, detecting a CIR distribution area based on the ratio between the average power of the signal within the first window and the average power of the signal within the second window and at least one threshold value, eliminating the noise from the CIR distribution area and estimating the CIR information. Accordingly, noise interference can be minimized and accurate channel estimation can be accomplished.

Abstract: The pilots of a wireless system are arranged to reduce inter-sector interference by establishing a systematic assignment of pilots across the system. In one embodiment, the pilots are differently coded and directionally positioned within a cell such that the same pilot from adjacent cells do not overlap. In one embodiment, Walsh codes are used to create the differently coded pilot signals.

Abstract: A method for detectable a pre-amble location in a multiple preamble OFDM (Orthogonal Frequency Division Multiplexing) system is disclosed. An OFDM signal is generated with a plurality of frames, and each of the frames includes symbols and a predetermined preamble symbol. A maximum FDDC (Frequency Domain Differential Correlator) value is computed for each of the symbols in some of the frames. The pre-amble location in a frame is determined by summing the maximum FDDC value for each symbol at a same frame location in consecutive frames of the OFDM signal.

Abstract: Embodiments of the invention can resolve conflicts between candidate master network devices such as may be encountered in a failover condition. In a common type of failover protocol, two or more candidate master devices send messages to each other prior to a failover condition. A witness device (or process or service) also casts a vote to prevent a stalemate condition between the two candidate master devices that could lead to an error condition where multiple masters, or no masters, are elected.

Abstract: Method and system for diagnosing communication faults in a Voice over Internet Protocol (VoIP) session includes responding to a creation of a first interface by a customer of a VoIP service to a VoIP service provider, creating a second interface between the customer and the VoIP service provider, initiating a diagnostic tool from the second interface, providing a plurality of reports based on results of the diagnostic tool and the end viewer of such reports; and providing a solution to the communication fault. The second interface is created by instructing the customer to launch a web-based application via the first interface. Alternately, instructions to the customer are provided via means other than the first interface such as voicemail, email or Instant Message. The diagnostic tool is initiated by the customer entering basic information regarding a corresponding customer account.

Abstract: A method for resolving switch number conflicts in a stackable switch system includes communicating a message between switches in the stackable switch system and determining, based on the communicated message, that two or more switches in the stackable switch system have the same switch number. The method also includes, in response to the determination that two or more switches have the same switch number, determining whether any of the switches should keep the switch number or select a new switch number.

Abstract: A method for SIP presence server failover, the method including setting an expiration time of a SIP application session on a first SIP server having a first SIP presence server to match the expiration time of a SIP request that is associated with the SIP application session, setting a SIP request attribute set representing a plurality of attributes of the SIP request, replicating the SIP application session together with the attribute set to a second SIP server having a second SIP presence server, migrating the SIP application session to the second SIP server for activation thereat, detecting an event indicating that the SIP application session has been migrated, and upon detection of the event, reestablishing at the second SIP presence server the SIP request associated with the SIP application session and using the attribute set.

Abstract: A wireless network system includes a plurality of nodes. Each node includes two or more redundant network interfaces, and each one of these network interfaces operates on a different channel. A plurality of links couple the nodes together. A layer residing on each of the nodes detects a link status associated with each interface, and switches to a redundant interface of a node when the link degrades beyond a tolerance. The routing and control layer provides redundant non-overlapping routes.

Abstract: Embodiments of the present invention may relate to methods of traffic measurement on a network. In some embodiments, the methods may include obtaining a measure of shaped traffic before shaping on the basis of passive traffic observations of the shaped traffic. In one embodiment, the method may include analysing a traffic aggregate of packets in a network comprising: separating the traffic aggregate into a series of individual co-temporal sub-aggregates; and performing a measurement using the individual sub-aggregates of the series to obtain a statistical measure for the traffic aggregate.

Abstract: A method implemented in a node to forward data packets via a communication link to another node. The method includes receiving an indication of a resource level associated with one or more ports among the other node's ingress and egress ports. The indication to be received via a side-band communication link coupled to the other node. The method further includes forwarding one or more data packets associated with data to the other node based on the indicated resource level received via the side-band communication link.

Abstract: An apparatus for a wireless communication system that includes means for determining available resources in the wireless communication system and means for determining an admission of a flow.

Abstract: A method for managing a network node overload and a communication network system thereof, wherein upon transferring to a network entity (i.e., the RNC or CN entity) at least one or more information elements by being included in a certain message through an Iu interface (or an IuFlex interface) which connects an RNC with a CN entity, the network entity having received the certain message performs a particular algorithm (i.e., an algorithm corresponding to the certain message) to control a signaling load between the RNC and the CN entity, thereby preventing in advance and managing an overload of a certain network node.

Abstract: This invention relates to a centralized packet scheduler for a wireless communications network such as HSDPA, 1×EV-DO Revisions 0, A and B, WiMAX, infrastructure-mode WiFi and any other type of network where centralized packet scheduling is applicable. The invention provides a utility-opportunity cost packet scheduling scheme for high-speed access that simultaneously achieves efficiency, fairness, user satisfaction, and flexibility. The scheme employs a flexible utility function that incorporates the channel quality conditions of the users as well as a fairness measure. The utility function maximizes user satisfaction as perceived by the service provider while ensuring that users with favourable instantaneous channel quality conditions do not monopolize the radio resources. In addition, the scheme uses an opportunity cost function to allow the service provider to optimize fairness in the context of network throughput and hence, to control the system capacity. The scheme combines the requirements of users (e.

Abstract: In a data packet transmission network a stream of packets of data sent by a first terminal passes in transit through at least one network equipment with which there is associated a stream measurement unit; wherein said first terminal and said measurement unit are connected to a collection unit.

Abstract: A method and apparatus for generating a unique packet identifier from receive packet header information accepts a series of packet words that make up a packet and selects a subset of a first packet word and a subset of a second packet word. The unique packet identifier is generated from a combination of the subsets selected from the first and second packet words for each packet received.

Abstract: Embodiment of the present invention relate to methods of traffic measurement on a network. In some embodiments, the methods include obtaining a measure of shaped traffic before shaping using reference packets injected onto the network at a first location (prior to shaping). The methods may further include measuring the traffic on the network at a second location (after shaping) and using the reference packets for timing purposes.

Abstract: Systems and methods for providing dynamic changes to a packet flow in a communication network are described. The dynamic changes can include upgrading and downgrading quality of service (QoS), adapting the stream to a receiving device, modifying the stream to counter-act changes in an air interface, and modifying the stream to accommodate an inter-technology handover. These changes can be provided by inspecting packets at a gateway and setting up a proxy for multimedia stream packet flows. The proxy can coordinate transcoding to take place to change the stream. The gateway can also monitor conditions at the mobile node using a real time control protocol or other applicable protocols.

Abstract: The present invention discloses a method for detecting abnormal network packets, which is applied to a packet distributing unit in a network. The packet distributing unit exchanges a plurality of network packets with a plurality of network devices on an extranet, and records a destination IP address, a destination port number and a network packet output time of the network packets specifically outputted within at least two time periods, every time before the packet distributing unit sends these specific output network packets out, then the packet distributing unit compares these specific output network packets in different time periods to determine whether or not there are data having the same output time, same destination IP address and same destination port number; if yes, then the packet distributing unit issues a warning report.

Abstract: An electronic device having logic that allows testing the device via a network interface is disclosed herein. The electronic device comprises the following. The electronic device has testing logic that receives test input signals and generate a test output signal. The electronic device has a network interface that is operable to receive network packets. The electronic device has packet processing logic communicatively coupled to the network interface that is able to determine whether a packet received in the network interface is a packet for testing the apparatus. The packet processing logic extracts test information from packets received on the network interface that are determined to be test packets, and generates the test input signals for the testing logic from the extracted test information. The packet processing logic incorporate test results into network packets based on the test output signal from the testing logic.

Abstract: A packet-oriented communication link is set up from a first to a second terminal in a data network. The first terminal sends a test data packet to the second terminal, the route of the test data packet in the data network being detected. The detected route is used to check whether the first and the second terminal are arranged in the same local address space. The local address of the first terminal is used as sender address for setting up the communication link in cases in which the result of the check is positive, and the global address is used in the other cases.

Abstract: The present invention provides a channel switching method for use with a wireless mouse by intelligently switching the communication channels with a wireless signal receiver. Firstly, the packet error rate is detected to discriminate whether the number of continuous failed packets is greater than a threshold value. Subsequently, the received signal strength indicator (RSSI) is detected to discriminate whether the wireless transmitter needs to switch the current communication channel with the wireless signal receiver.

Abstract: Routing data packet traffic in packet networks, expediting the flow of the data packets and reducing the effects of congestion at nodes is accomplished by capturing latency data for nodes for initial measurement times; and computing a least squares estimate of the delay as a recursive least-squares solution.

Abstract: The present invention relates to a method that provides for advertising a network node to a managing node in a communication network. To this end, at the network node, position data of the network node are determined. At the managing node, at least one condition to be satisfied by the network node is set and a request message containing the at least one condition is transmitted by the managing node. Then, the request message containing the at least one condition is received at the network node and the at least one condition is evaluated at the network node. In case a specified combination of conditions is satisfied, the network node replies with a reply message containing at least a network protocol address and the determined position data of the network node. The present invention further relates to a corresponding system and network entities involved.

Abstract: Capability checking to examine a computing device's capabilities to determine if the device supports a software defined radio to communicate according to a specific wireless protocol. Applicants have appreciated that as the reliance on software defined radio increases, numerous potential options may be available to a user for performing wireless communication. Applicants have appreciated the desirability of providing the ability to discover the capabilities of a user's computer to determine whether it is capable of supporting one or more wireless protocols.

Abstract: Disclosed is a system and method of managing network performance. The method includes receiving input data identifying a customer. The method also includes determining a plurality of network elements related to the customer, where the customer receives video content over a private video distribution network that includes the plurality of network elements related to the customer and at least one network device not related to the customer. The method also includes receiving performance data of each of the plurality of network elements related to the customer.

Abstract: A computer implemented method is provided for monitoring the quality of service of a service provider, the method comprising the steps of receiving first and second reports from first and second clients, respectively, the first and second reports having information relating to the quality of service provided by the service provider to the first and second clients, respectfully, and estimating the quality of service of the service provider by aggregating the information in the first and second reports and comparing the aggregated information with conditions set forth in an agreement involving the service provider.

Abstract: A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.