Abstract: A communication system includes a network office and at least one twisted pair loop plant wiring path between the network office and a first premises network. The network office is transmits first data over the twisted pair loop plant wiring using Ethernet protocol to the first premises network, and receives second data over the twisted pair loop plant wiring using Ethernet protocol from the first premises network.

Abstract: A method of transmitting/receiving a packet using a hybrid automatic repeat request in the mobile communication system is disclosed. The packet data transmitting method includes transmitting at least one sub packet divided from plurality of encoded packets generated by repeating a bit stream that is made by encoding information desired to be transmitted with ? rate turbo encoder, and transmission start point information of the sub packet through the sub packet identifier field on the accompanying control channel.

Abstract: Some demonstrative embodiments of the invention include a method device and/or system of communicating circuit switch information, e.g., between two or more circuit switch interfaces, over an analog modulation communication network. The method, according to some demonstrative embodiments may include synchronizing at least one slave clock of at least one respective local circuit switch interface to a master clock of a master circuit switch interface which communicates with the at least one local circuit switch interface over an analog modulation communication network. Other embodiments are described and claimed.

Abstract: For enhancing the performance of an adaptive jitter buffer, a desired amount of adjustment of a jitter buffer is determined at a first device using as a parameter an estimated delay. The delay comprises at least an end-to-end delay in at least one direction in a conversation. For this conversation, speech signals are transmitted in packets between the first device and a second device via a packet switched network. An adjustment of the jitter buffer is then performed based on the determined amount of adjustment.

Abstract: An allowable temperature range satisfying phase matching conditions of a wavelength conversion device is widened. A wavelength conversion light source includes a semiconductor laser diode device (1) applied with an antireflection film (3), a lens (4) arranged opposite to the semiconductor laser diode device (1), an optical fiber (5) having a Bragg grating (6) arranged in a core thereof, and a wavelength conversion device (8) formed of a nonlinear optical crystal on which light from the semiconductor laser diode device (1) is incident. In the wavelength conversion light source, the semiconductor laser diode device (1) oscillates in coherent collapse mode.

Abstract: A laser light control device for an image forming apparatus designed to improve the auto power control (APC) accuracy and to reduce the control time. A multifunctional optical element has a plurality of different optical characteristics. A detecting unit is adapted to detect laser light from the semiconductor laser. A control unit is adapted to perform control of the write start position of the laser light in the main scanning direction and control of the quantity of the laser light by detecting the laser light by means of the detecting unit after passage of the laser light through the multifunctional optical element.

Abstract: An optical transmitter module includes a semiconductor laser for outputting forward outgoing light and backward outgoing light, a temperature control device for controlling a temperature of the semiconductor laser, a beam splitter plate for receiving incidence of the backward outgoing light and outputting split light, which is reflected part of the backward outgoing light and transmitted light, which is part of the backward outgoing light, a first photoelectric conversion element for converting the split light into an electric signal. The beam splitter plate includes an anti-stray-light structure for preventing the transmitted light reflected by an incident surface of a wavelength filter from entering the first photoelectric conversion element through a side end surface portion of the beam splitter plate.

Abstract: A high speed optical channel including an optical driver and a photodetector in a CMOS photoreceiver. The optical channel driver includes a FET driver circuit driving a passive element (e.g., an integrated loop inductor) and a vertical cavity surface emitting laser (VCSEL) diode. The VCSEL diode is biased by a bias supply. The integrated loop inductor may be integrated in CMOS technology and on the same IC chip as either/both of the FET driver and the VCSEL diode. The photodetector is in a semiconductor (silicon) layer that may be on an insulator layer, i.e., SOI. One or more ultrathin metal electrodes (<2000 ?) on the silicon layer forms a Schottky barrier diode junction which in turn forms a quantum well containing a two dimensional electron gas between the ultrathin metal electrode and the Schottky barrier diode junction.

Abstract: A semiconductor laser device according to the present invention includes: a semiconductor laser chip 1 for emitting laser light; a stem 3, 4 for supporting the semiconductor laser chip; a plurality of terminal electrodes, inserted in throughholes provided in the stem 3, 4, for supplying power to the semiconductor laser chip; and a cap 5 having an optical window 6 which transmits laser light and being affixed to the stem 3, 4 so as to cover the semiconductor laser chip 1. Between the stem 3, 4 and the terminal electrodes 7, this device includes insulation glass 8, which does not release silicon fluoride gas when heated to a temperature of no less than 700° C. and no more than 850° C.

Abstract: What is specified is an edge emitting semiconductor laser chip comprising a carrier substrate (1), an interlayer (2) promoting adhesion between the carrier substrate (1) and a component structure (50) of the edge emitting semiconductor laser chip, and the component structure (50) comprising an active zone (5) provided for generating radiation.

Abstract: Example embodiments are directed to a semiconductor laser diode and a method of fabricating the same. The semiconductor laser diode may include a first semiconductor layer formed over a first substrate and capable of emitting light, and a second semiconductor layer capable of guiding the emitted light, wherein the first and second semiconductor layers are bonded to each other. The method of fabricating the semiconductor laser diode may include forming over a first substrate a first semiconductor layer capable of emitting light, forming over a second substrate a second semiconductor layer capable of guiding the light, bonding the first semiconductor layer to the second semiconductor layer, and removing the second substrate. The second semiconductor layer may be grown separately under conditions different from those for forming the first semiconductor layer, and may be subsequently bonded to the first semiconductor layer.

Abstract: The present invention provides a Be-based group II-VI semiconductor laser using an InP substrate and having a stacked structure capable of continuous oscillation at a room temperature. A basic structure of a semiconductor laser is constituted by using a Be-containing lattice-matched II-VI semiconductor above an InP substrate. An active laser, an optical guide layer, and a cladding layer are constituted in a double hetero structure having a type I band line-up in order to enhance the injection efficiency of carriers to the active layer. Also, the active layer, the optical guide layer, and the cladding layer, which are capable of enhancing the optical confinement to the active layer, are constituted, and the cladding layer is constituted with bulk crystals.

Abstract: The present invention provides a semiconductor laser diode that has the buried mesa stripe and a current blocking layer without involving any pn-junction. The laser diode includes a lower cladding layer, an active region and an upper cladding layer on the GaAs substrate in this order. The mesa stripe, buried with the current blocking layer, includes the first portion of the upper cladding layer in addition to the active region. The current blocking layer of the invention is made of one of un-doped GaInP and un-doped AlGaInP grown at a relatively low temperature below 600° C. and shows high resistivity greater than 105 ?·cm for the bias voltage below 5 V.

Abstract: A semiconductor laser includes a p-type InP substrate and a ridge section of a p type InP first cladding layer, an AlGaInAs strained quantum well active layer and a n type InP second cladding layer, laminated one atop the other. On both sides of the ridge section, a current blocking layer including a p-type InP first burying layer, an n-type InP second burying layer, and a semi-insulating Fe-doped InP third burying layer are laminated, one atop the other. A top face of the third burying layer is covered with an n-type InP semiconductor layer. This structure suppresses leakage current on the top face of the third burying layer and improves reliability of the semiconductor laser.

Abstract: A semiconductor laser includes a nitride semiconductor substrate with a striped raised portion that extends in a resonant cavity length direction, a masking layer, which has been defined on the principal surface of the nitride semiconductor substrate and which has a striped opening in a selected area on the upper surface of the striped raised portion, and a nitride semiconductor multilayer structure, which has been grown on the selected area on the upper surface of the striped raised portion. The nitride semiconductor multilayer structure is thicker than nitride semiconductors on the masking layer, and the nitride semiconductor multilayer structure is broader in width than the striped opening of the masking layer and includes portions that have grown laterally onto the masking layer.

Abstract: A method of manufacturing a light source device includes: preparing a holder, on which a semiconductor laser and a coupling lens are provided, the coupling lens having a first side and a second side opposite to the first side, the first side confronting the semiconductor laser, a photopolymerizable resin being provided on the holder at least at a location between the coupling lens and the holder; locating a light source for emitting a curing light for curing the photopolymerizable resin on an opposite side of the semiconductor laser with respect to the coupling lens, a reflecting member being provided on an opposite side of the light source with respect to the coupling lens; and curing the photopolymerizable resin by directly irradiating the curing light from the light source on a part of the photopolymerizable resin, and also irradiating the curing light on another remaining part of the photopolymerizable resin by reflecting the curing light on the reflecting member.

Abstract: A method is disclosed for appraising a body having low heat conduction by detecting a temperature field of the body, the body being energetically influenced via its surface, the temperature field of the energetically influenced body being detected simultaneously or subsequently, and evaluation being performed as a function of the detected temperature field, influencing being performed at low power.

Abstract: A measuring instrument for gravimetric moisture determination of a sample includes a radiator, a weighing cell, and a sample receiver which can be connected to the weighing cell. The sample receiver is configured to allow the sample to be placed on or removed from the sample receiver. The radiator has a radiation-releasing surface directed at the sample and that covers substantially the entire surface of the sample with a uniform radiation intensity. The radiator is arranged above the sample, relative to the direction of the load, and spans over the entire sample. The measuring instrument also includes a means for removing the moisture emitted from the sample during the operation of the instrument device from the space between the sample and the radiation-releasing surface.

Abstract: A differential scanning calorimeter apparatus includes reference and sample cells and controlled temperature shields. The temperature of the shields is controlled such that baseline curvature is reduced by eliminating heat flow from the furnaces to their surroundings (quasi adiabatic conditions) and by controlling heat flow through a well defined solid state heat resistance between the furnaces and a temperature controlled heat sink. The temperature of each shield can be controlled independently to reduce differential heat flow over the whole temperature range of the scan, or maintained at a constant temperature for conventional power compensated DSC operation. The temperature/time profile for each shield can be controlled according to actual furnace temperature, obtained from an empty run, or stored in the computer memory and recalled for sample measurements.

Abstract: A temperature detector includes a plurality of temperature sensors each configured to generate a voltage signal in accordance with sensed temperature and output the voltage signal, a plurality of storage circuits corresponding to the respective temperature sensors and each configured to store a signal level input to the storage circuit and output the stored signal level in response to a control signal, and a control circuit configured to exclusively select one of the voltage signals output from the respective temperature sensors, compare the selected voltage signal with a predetermined reference voltage, and store the selected voltage signal into the corresponding storage circuit sequentially in response to the control signal.

Abstract: A thermometer includes a tip member with a thermal contact surface and a first thermal sensor disposed therein for sensing the temperature thereof and producing a first temperature signal. A probe member secured to the tip member includes a front end portion with a thermal compensation point and a second thermal sensor is disposed within the front end portion for sensing the temperature of the thermal compensation point and producing a second temperature signal. A processing unit, disposed within the probe member for receiving the first and second temperature signal, selects a thermal compensation value corresponding to the second temperature signal at a rate of temperature change of the first temperature signal lower than a predetermined value. The thermal compensation value is adapted to compensate the first temperature signal thereby producing an estimated temperature value. And a display unit displays a temperature reading based on the estimated temperature value.

Abstract: On the basis of control information for CQI transmission of which a base station notifies a mobile station, the mobile station transmits CQI information for each sub-frame in a case of best effort type service or transmits the base station the CQI information at one time for every four sub-frames in a case of rate preservation type service.

Abstract: An apparatus and a method for estimating a channel in a broadband wireless access system. A receiving apparatus includes a first channel estimation filter having a tap coefficient which is channel-adaptively variable, the first channel estimation filter acquiring a channel impulse response by filtering received pilot symbols, a second channel estimation filter having a fixed tap coefficient, the second channel estimation filter acquiring a channel impulse response by filtering received pilot symbols, and a selector which selects the operation of one of the first and the second channel estimation filters according to channel correlativity.

Abstract: A receiver for the CDMA system which reduces power consumption during a suspension period of intermittent receiving operation by monitoring a suspension period by a low-power timer so that a VC-TCXO, reference signal group generation and receiving units are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is started to count a time period and part of a received signal is stored. A PN code phase of stored data is calculated during the time period to obtain an indication value for phase deviation. State vectors for short and long codes and a further reception time are calculated based on the indication value. When the high-accuracy timer counts the time period and produces 0V(d), demodulation operation by a rake demodulation, demultiplexing, and descrambler units is started and is continued during the reception time.

Abstract: A receiving apparatus includes an error detecting circuit configured to detect an error of a reception signal; an error correcting circuit configured to correct the detected error of the reception signal; a power measuring circuit configured to measure a power value of the reception signal; and a power supply control section configured to control a power supply to the error correcting circuit based on the power value. The receiving apparatus further includes a receiving circuit configured to receive a radio signal; a rake finger section configured to execute a despreading process on the signal received by the receiving circuit, and a rake combining section configured to carry out a rake combination of the plurality of signals subjected to the despreading process to generate the reception signal.

Abstract: A transceiver includes a processor, which is adapted to in a transmit mode of the transceiver, form at least part of a transmitter and in a receive mode of the transceiver, form at least part of a receiver. The transceiver may include at least one analog-to-digital converter to provide digital signals to the processor in both the transmit and receive modes of operation; and the transceiver may include at least one digital-to-analog converter to receive digital signals from the processor in the transmit and receive modes of operation. The processor may be fabricated on an integrated circuit with at least one of the analog-to-digital converters and/or with at least one of the digital-to-analog converters.

Abstract: A method and apparatus for receiving one of a plurality of Ethernet transmission protocol signals is disclosed. Each transmission protocol signal includes a plurality of transmission signal streams. The method includes determining which of the transmission protocol signals is being received. An analog front-end processor is connected to one of a plurality of protocol digital processors based on the transmission protocol signal being received. A setting of at least one functional parameter of the analog front-end processor and/or the protocol digital processors is selected based on the transmission protocol signal being received. A sampling rate of the analog front-end processor and/or a processing rate of the protocol digital processors are selected based on the transmission protocol signal being received. The plurality of transmission signal streams of the transmission protocol signal being received by the analog front-end processor are ADC sampled based on a shared clock source.

Abstract: A data communication system includes circuitry to assure components respond to variations in the time length of the valid data window or “eye” of the high speed data communication signal. A self-test portion of the system periodically injects the effects of phase jitter into the data communication signal to assure the system performs properly.

Abstract: A wireless communication method and system using virtual MIMO (“V-MIMO”) are provided. Post processing signal to interference and noise ratios (“SINR”) for a plurality of signals corresponding to a plurality of mobile terminals arranged as a V-MIMO group are estimated. The one of the plurality of mobile terminals having the highest post processing SINR is selected. Wireless communication for the selected mobile terminal is scheduled. The signal corresponding to the selected mobile terminal is cancelled. Post processing signal to interference and noise ratios (“SINR”) for the signals corresponding to the remaining mobile terminals is re-estimated. The one of the remaining mobile terminals having the highest post processing SINR is selected. Wireless communication for the selected remaining mobile terminal is scheduled.

Abstract: A modulation scheme deciding apparatus, a receiving apparatus, a modulation scheme deciding method and modulation scheme deciding program can improve a performance of the frame modulation scheme decision without the influence of an error in the modulation scheme decision in each burst and improve throughput of the receiving apparatus. Receiver 100 has modulation scheme deciding apparatus 106, the modulation scheme deciding apparatus 106 including: received quality measuring apparatus 101 that measures received qualities of received data transmitted from a plurality of bursts separated from one frame; frame modulation scheme deciding apparatus 102 that decides a modulation scheme of frame based on received qualities of a plurality of modulation schemes measured in each burst; and burst modulation scheme deciding apparatus 103 that decides the modulation scheme of each burst based on the received quality of received data.

Abstract: A signaling circuit having a selectable-tap equalizer. The signaling circuit includes a buffer, a select circuit and an equalizing circuit. The buffer is used to store a plurality of data values that correspond to data signals transmitted on a signaling path during a first time interval. The select circuit is coupled to the buffer to select a subset of data values from the plurality of data values according to a select value. The equalizing circuit is coupled to receive the subset of data values from the select circuit and is adapted to adjust, according to the subset of data values, a signal level that corresponds to a data signal transmitted on the signaling path during a second time interval.

Abstract: A method for processing at least one complex signal may include equalizing compensating for a phase error of an input complex signal. The input complex signal may include a first channel signal and a second channel signal, which is perpendicular to the first channel signal. A phase imbalance and an amplitude imbalance between a first channel signal and a second channel signal may be compensated to generate an imbalance compensated signal.

Abstract: A method of synchronizing a feedforward filter that receives a signal resulting from the transmission of a series of symbols through a channel, wherein the series of symbols includes a predetermined sequence of symbols includes the step of developing a plurality of samples from the received symbols, wherein a sequence of samples corresponds to the predetermined sequence of symbols. The method further includes the steps of estimating a channel impulse response from the plurality of samples, wherein the channel impulse response estimate is represented by a plurality of correlation values, identifying a maximum correlation value from the plurality of correlation values, defining a window relative to the maximum correlation value, calculating a characteristic of the correlation values within the window, and synchronizing the feedforward filter in accordance with the characteristic.

Abstract: Embodiments include a decision feedback equalizer (DFE) circuit, including at least one reorder block configured to reorder a set of current sliced bit values based on one or more previous sliced bit values, and a selector configured to select one of the reordered current sliced bit values as a DFE output based on a group of non-adjacent DFE outputs.

Abstract: Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is partitioned into two stages; a first stage compensates ISI components induced by characteristics of a transmitters partial response pulse shaping filter in a demodulator, a second stage compensates ISI components induced by characteristics of a multi-pair transmission channel in a Viterbi decoder. High speed decoding is accomplished by reducing the DFE depth by providing an input signal from a multiple decision feedback equalizer to the Viterbi based on a tail value and a subset of coefficient values received from a unit depth decision-feedback equalizer. Power reduction is accomplished by adaptively truncating active taps in the NEXT, FEXT and echo cancellation filters, or by disabling decoder circuitry portions, as channel response characteristics allow.

Abstract: A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Abstract: A transmitter portion 14 includes a control circuit 32, a driver circuit 33, and a wave detector circuit 35. The control circuit 32 generates control signals Vp, Vn based on a pulsed transmission signal So. The driver circuit 33, which is supplied with a battery voltage Vb, generates an output signal Sa to be sent to an antenna 13 based on the control signals Vp, Vn. The wave detector circuit 35 outputs a detection signal Sk having a voltage proportional to the level of the output signal Sa (transmission power level). The control circuit 32 changes the pulse widths of the control signals Vp, Vn based on the voltage level of the detection signal Sk. As a result, electric power consumption is reduced and enlargement of an apparatus is suppressed while maintaining the transmission power level constant.

Abstract: A communications device includes a supply terminal which is able to be connected to a two-position-controlled power supply; a pulse width recording device, which is coupled to the supply terminal and which records a pulse width of current pulses that flow through the supply terminal, and a signal processing device which assigns a first logical level to a first recorded pulse width and a second logical level to a second recorded pulse width.

Abstract: Separate first and second input streams of image frames are received by a frame combiner module, which combines an image frame from the first stream with an image frame from the second stream to produce a single output stream of combined frames. The single output stream is encoded by an encoder module such as an MPEG encoder to produce an encoded output signal, which may be stored or transmitted over a network.

Abstract: An image and motion corresponding to the image are presented in response to a request issued by an user. The user transmits image data from a terminal to a motion data generating apparatus. The motion data generating apparatus generates motion data from the received image data. The motion data generating apparatus transmits the generated motion data together with the image data, in a mutually related fashion, to an image/motion control apparatus. The motion data generating apparatus also transmits ID data assigned to the image data and the motion data to the terminal. The image/motion control apparatus stores the received data. When the image/motion control apparatus receives ID data input by a user via an image/motion presenting apparatus, the image/motion control apparatus reads image data and motion data corresponding to the received ID data and transmits the image data and the motion data to the image/motion presenting apparatus.

Abstract: An image decoding device and an image encoding device according to the present invention includes an arithmetic unit for performing arithmetic processing, an arithmetic data storage unit for storing an arithmetic result by the arithmetic unit, an input selection unit for selecting whether to read pixel data that is to be inputted to the arithmetic unit from compressed image data or from pixel data stored in the arithmetic data storage unit, and inputting the read pixel data to the arithmetic unit, and an arithmetic control unit for controlling, based on a transform mode used and the number of arithmetic operations in the arithmetic unit, a destination from which the pixel data that is to be inputted to the arithmetic unit by the input selection unit is read as well as a combination of pieces of pixel data targeted for the arithmetic processing by the arithmetic unit and multiplier coefficients for the arithmetic processing, the arithmetic control unit previously defining an arithmetic procedure in each transf

Abstract: Multiplexing means of an image encoding device multiplexes object display speed information or image display absolute time information, and an image decoding device performs image processing on the basis of the multiplexed object display speed information or image display absolute time information, whereby image decoding process can be performed smoothly and accurately.

Abstract: Techniques and tools for sub-block transform coding are described. For example, a video encoder adaptively switches between 8×8, 8×4, and 4×8 DCTs when encoding 8×8 prediction residual blocks; a corresponding video decoder switches between 8×8, 8×4, and 4×8 inverse DCTs during decoding. The video encoder may determine the transform sizes as well as switching levels (e.g., frame, macroblock, or block) in a closed loop evaluation of the different transform sizes and switching levels. The encoder and decoder may use different scan patterns for different transform sizes when scanning values from two-dimensional blocks into one-dimensional arrays, or vice versa. The encoder and decoder may use sub-block pattern codes to indicate the presence or absence of information for the sub-blocks of particular blocks.

Abstract: In a time/space-division filtering, a moving image signal in a certain resolution-hierarchy, for which time hierarchizing is performed, is divided into a time low-band signal and a time high-band signal. A moving image signal, which has the moving image signal corresponding to the time high-band signal reconstructed by employing the time low-band signal and the time high-band signal, is generated. A reduced image signal having the moving image signal reduction-processed is generated. A high-band generating process by space hierarchizing is performed for the time high-band signal, thereby to generate a time high-band/space high-band signal. The time low-band signal, the reduced image signal, and the time high-band/space high-band signal are assumed to be a division result respectively.

Abstract: A method and system for fast video transcoding are disclosed. In one embodiment, the system comprises a processor, memory coupled to the processor, a video processor and a display. The video processor includes an input that receives MPEG-2 data; and an output that provides a bitstream to a display on a portable video device. The video processor also includes a transcoder that processes the MPEG-2 data and generates H.264 data. The H.264 data is one fourth the resolution of the MPEG-2 data.

Abstract: Motion prediction and compensation circuit does not select Skip mode and Direct mode in motion prediction and compensation mode when a difference between prediction motion vector and actual motion vector exceed predetermined standard.

Abstract: A method and apparatus for coding an image includes calculation of motion vectors of vertices of a patch in an image being encoded and transmitting information of horizontal and vertical components of the motion vectors of the vertices and information specifying that values of the horizontal and vertical components of a motion vector for each pixel in the patch are integral multiples of 1/d of a distance between adjacent pixels, where d is an integer not less than 2.

Abstract: A method and apparatus for coding an image includes calculation of motion vectors of vertices of a patch in an image being encoded and transmitting information of horizontal and vertical components of the motion vectors of the vertices and information specifying that values of the horizontal and vertical components of a motion vector for each pixel in the patch are integral multiples of 1/d of a distance between adjacent pixels, where d is an integer not less than 2.

Abstract: A method and apparatus for coding an image includes calculation of motion vectors of vertices of a patch in an image being encoded and transmitting information of horizontal and vertical components of the motion vectors of the vertices and information specifying that values of the horizontal and vertical components of a motion vector for each pixel in the patch are integral multiples of 1/d of a distance between adjacent pixels, where d is an integer not less than 2.

Abstract: A graphics controller for performing real-time multi-level wavelet decomposition is provided. The graphics controller, includes an interface for receiving streaming data. The graphics controller includes wavelet decomposition circuitry configured to receive the streaming data from the interface. The wavelet decomposition circuitry includes a single low pass filter and a single high pass filter. A plurality of shift register banks receiving output from the low pass filter are included, as well as a multiplexer receiving input from the plurality of shift register banks and the streaming data, wherein the streaming data is unbuffered between the interface and the multiplexer. Control logic for selecting output from the multiplexer and enabling shift registers of the plurality of shift register banks to transmit data for input to the multiplexer is also include in the wavelet decomposition circuitry. A method for performing a multi-level wavelet decomposition in hardware is also provided.