Patents Examined by Khai Nguyen
  • Method and system for authentication of units in a communications network
    Patent number: 7020456
    Abstract: A method of granting, to a user communications device, access to a service provided by a plurality of service communications devices where an access key code is generated during an initial communications session between the user communications device and one of the service communications devices. The established access key code is subsequently stored in the user communications device and made available to the service communications devices for use in subsequent communications sessions between the user communications device and any one of the service communications devices. The invention further relates to a communications system and a user communications device.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: March 28, 2006
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Ben Smeets, Christian Gehrmann, Allan Bøgeskov
  • EFM data decoding method and apparatus thereof for optical disk system
    Patent number: 7015836
    Abstract: An EFM data decoding method and apparatus thereof for optical disk system is provided. According to the method, a 14-bit data complying with the EFM modulation criteria but failing to correspond to a 8-bit data based on an EFM decoding table is transformed successfully by looking up an expanded EFM decoding table. The expanded EFM decoding table includes probable 8-bit data corresponding to the erroneous data complying with the EFM modulation criteria. Reliability of data reading is thus enhanced in the present invention.
    Type: Grant
    Filed: March 1, 2005
    Date of Patent: March 21, 2006
    Assignee: VIA Technologies, Inc.
    Inventors: Pei-Jei Hu, S L Ouyang
  • Mobile radio terminal
    Patent number: 7016706
    Abstract: An image processing section reads out moving picture data from a memory section in accordance with an instruction from a control section, and subjects the moving picture data to a predetermined data process and converts it to image data and voice data. Based on the image data, a driver drives a display section for display control. The control section controls respective parts of a mobile radio terminal. Even while a moving picture is being reproduced, if call reception occurs, the control section temporarily suspends the reproduction of the moving picture and indicates the occurrence of call reception. If the call ends, the control section resumes the reproduction of the moving picture.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: March 21, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Osamu Kurokawa, Masaaki Furusawa, Junichi Igarashi, Kiyoshi Wagai, Yasuhiro Tsukui
  • Method for multicast delivery with designated acknowledgment
    Patent number: 7013157
    Abstract: A packet format for multicast messages which designates a single receiver to send an acknowledgment to the multicast message. The designated receiver responds to the multicast message with an acknowledgment. If the designated receiver does not respond to the multicast message, the message is resent. The resent message may designate a different receiver for acknowledging the message.
    Type: Grant
    Filed: June 3, 2002
    Date of Patent: March 14, 2006
    Assignee: Cisco Technology, Inc.
    Inventors: Stuart Norman, Douglas Smith
  • Voltage-to-current converter
    Patent number: 7012466
    Abstract: A load responds to a voltage-to-current converter including a differential amplifier. A sensing resistor is series connected with the load and first and second feedback resistors, respectively included in first and second voltage dividers having taps connected to non-inverting and inverting inputs of the amplifier. One divider is connected between a first terminal of the sensor resistor and one voltage responsive input terminal of the converter. Another divider is connected between the second terminal of the sensor resistor and a second converter input terminal, that can be grounded or voltage responsive. The feedback resistors have the same value that is much greater than the sensor resistor value. The first divider can be connected to the first or second terminal of the sensor resistor and vice versa for the second divider.
    Type: Grant
    Filed: February 5, 2004
    Date of Patent: March 14, 2006
    Inventor: Mauro Cerisola
  • Analog-to digital converter compensating apparatus and associated methods
    Patent number: 7009536
    Abstract: An analog-to-digital converter compensating apparatus and associated methods are provided. The apparatus can include an ADC, a state-slope sampler responsive to output data of the ADC to produce a state sample and a slope sample, a compensator which can include memory having an error-table associated therewith to provide an error or compensation sample to a combiner which combines the compensation sample with the state value to provide a compensated ADC output, and a compensator error processor positioned to receive the state sample, the slope sample, and an updated error value to dynamically update the compensator and thereby dynamically update the compensated ADC output.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: March 7, 2006
    Assignee: Lockheed Martin Corporation
    Inventor: Richard C. Gaus, Jr.
  • DVD recording method and rewritable DVD apparatus
    Patent number: 7009532
    Abstract: The DVD recording method is intended to increase the number of cycles allowed for recording on the disk an enormous number of times. This method comprises generating two data streams by using a plurality of code mapping variants prepared for coding input data, quasi-randomly selecting one of the plurality of code mapping variants, if absolute DSVs of the two streams are substantially equal, and converting into recording code sequences. This method prevents deterioration of the disk particularly in the management area and increases the number of cycles allowed for rewriting.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: March 7, 2006
    Assignees: Hitachi, Ltd., Hitachi-LG Data Storage, Inc.
    Inventors: Junko Ushiyama, Hiroyuki Minemura
  • High-speed DAC linearity measurement
    Patent number: 7009538
    Abstract: A high-speed digital-to-analog converter (DAC) measurement method acquires and quantizes an analog ramp output by the DAC corresponding to a digital ramp input to produce a quantized ramp, determines a start and end of the quantized ramp, obtains a difference between the quantized ramp and an ideal ramp to produce a quantized periodic signal (triangular or sinusoidal), determines a frequency for a qualified peak from an FFT of the quantized periodic signal, produces a mask filtered periodic signal from an iFFT around the qualified peak, and determines a sample window spanning a local maximum and minimum for each period of the quantized periodic signal. The ramp step levels are the averages of the samples within each sample window. From the step levels in DAC LSB's, resolution, monotonicity, differential lineary and integral linearity are determined for the DAC.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: March 7, 2006
    Assignee: Tektronix, Inc.
    Inventor: Kevin M. Ferguson
  • Modulator providing only quantization error component to delta sigma modulator
    Patent number: 7009539
    Abstract: A ?? modulator modulates only an error component separated by a component separating portion. Therefore, even if the number of order of the ?? modulator increases, an amplitude of an output of an integrator in the final stage does not excessively increase, and the stability of the modulator can be achieved. Since the signal component separated by the component separating portion does not pass through the ?? modulator, an intensity of an input signal can be maintained as it is, and the modulator can have high precision.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: March 7, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Takashi Okuda, Toshio Kumamoto, Yasuo Morimoto
  • Method and apparatus for dynamically determining a mobile station's active set during a connection rescue procedure
    Patent number: 7006821
    Abstract: A method for allowing a mobile station (MS) to dynamically adjust its T_ADD_R and T_DROP_R pilot signal strength thresholds (established by pilot Ec/Io values) used to add or drop pilots from the MS's active set during rescue. Dynamic adjustment of T_ADD_R and T_DROP_R allows the MS to select and add BSs (sectors) with sufficient forward link quality into their active sets and drop BSs (sectors) with poorer forward link quality during a call recovery procedure to recover an active connection before it is dropped. In addition, the effectiveness of recovering an active connection is improved through corresponding actions at the BS. The BS may use the signal strength measurements, active set information, and other pilot information to update its own active set for use in generating a forward rescue channel.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: February 28, 2006
    Assignee: Denso Corporation
    Inventor: Lai King Tee
  • Mobile communication system and switching apparatus
    Patent number: 7003321
    Abstract: When a signal is sent from a wireless base station 3-1, a wireless modem 10-1 converts the signal to a signal of a unified transmission form. The switch 11-1 switches the signal to one of wireless transceivers 12-1, 12-2 and the optical transceiver 13-1. The wireless transceiver 12-1 or 12-2 sends the signal to a control station 4 or a wireless base station 3—3 via a wireless circuit 20. The optical transceiver 13-1 converts the signal into an optical signal and sends the optical signal to a wireless base station 3-2 via an optical fiber circuit 30.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: February 21, 2006
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yuji Aburakawa, Toru Otsu
  • Peak time indicator
    Patent number: 7003279
    Abstract: A method and apparatus allow use condition determination in a wireless device. A wireless interface is coupled to a processor configured to input subscriber rate plan parameters associated with a service provider. Rate plan parameters include data associated with peak time charges. Rate plan parameters are compared with current parameters to determine if peak time charges are in effect. An indication that the peak time charges are in effect is then generated.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: February 21, 2006
    Assignee: Gateway Inc.
    Inventor: Larry A. Nickum
  • Master-slave communication system and electronic apparatus utilizing such system
    Patent number: 7003309
    Abstract: A communication system has a master device and a slave device clocked by the system clock generated by the master device for data transfer between them. When no data transfer takes place between them for a predetermined period, the slave device goes into a sleep mode. The slave device in the sleep mode can return to the active mode when it receives a system clock. Thus, the slave device can be placed in the sleep mode and return to the active mode without any additional signal lines. The communication system can save a large amount of power during the sleep.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: February 21, 2006
    Assignee: Rohm Co., Ltd.
    Inventors: Wataru Suzuki, Hiroshi Miura
  • Compensation circuit for amplifiers having multiple stages
    Patent number: 7002409
    Abstract: A compensation circuit is provided for an amplifier including at least first and second amplifier stage. The circuit includes a first capacitance including one end that communicates with an input of the first amplifier stage. An amplifier includes a first gain, an input that communicates with an opposite end of the first capacitance, and an output. A second capacitance includes a first end that communicates with the output of the amplifier and an opposite end that communicates with an input of the second amplifier stage. A first impedence includes one end that communicates with the input of the first amplifier stage and an opposite end that communicates with an output of the second amplifier stage.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: February 21, 2006
    Assignee: Marvell International Ltd.
    Inventor: Farbod Aram
  • Portable telephone and music reproducing method
    Patent number: 6999752
    Abstract: A portable telephone having music playback functions has a first storage for storing music data of plural musical tunes and a second storage (namely, a cache memory) for storing at least one musical tune to be reproduced. A musical tune that may be likely to be reproduced is selected from among plural musical tunes in accordance with prescribed rules, so that the music data of the selected musical tune are precedently transferred from the first storage to the second storage to enable smooth reproduction in response to an incoming call whose telephone number specifies the selected musical tune.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: February 14, 2006
    Assignee: Yamaha Corporation
    Inventor: Kazunari Fukaya
  • Interactive access to supplementary material related to a program being broadcast
    Patent number: 6993284
    Abstract: A method and apparatus for, interactively with a broadcast program that is being performed, enabling access to supplementary materials related to the program from a broadcast signal that is a combination of a programming signal and a supplementary materials signal. The broadcast output signal is received at a location of an audience. The programming signal of the received output signal is performed for the audience, with reproduction equipment. A signal related to the supplementary material signal is extracted from the received broadcast signal. Access to the supplementary material corresponding to the supplementary material signal is enabled in response to an interactive control signal actuated by a member of the audience tuned to the programming signal being performed, and based on the extracted signal.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: January 31, 2006
    Inventors: Lee S. Weinblatt, Thomas Langer
  • Wireless communication device with an improved antenna structure
    Patent number: 6990363
    Abstract: The present invention provides a wireless device including: at least an antenna; and at least a conductive ground serving as a ground, through which a high frequency current flows, and the conductive ground having at least a side which is approximately one quarter wavelength of a radio wave transmitted from the antenna, the at least side of the conductive ground having a feeding point, at which the antenna is electrically connected to the conductive ground, wherein the feeding point on the side is positioned closer to one end of the side than a center position, so that the feeding point is positioned asymmetrical to the conductive ground in any directions included in a plane parallel to the conductive ground, whereby the high frequency current flowing, through the conductive ground has an asymmetrical distribution of current over the conductive ground.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: January 24, 2006
    Assignee: NEC Corporation
    Inventors: Ryo Ito, Takao Ono
  • Cordless telephone system with wireless expansion peripherals
    Patent number: 6990356
    Abstract: A cordless telephone system comprising a base unit, at least one handset, and one or more expansion units is provided. The handset and the expansion units communicate with the base unit via communication channels implemented in a wireless communication protocol. The expansion units can provide the system with communication interfaces to various external networks, such as an additional analog telephone line, a digital telephone line, or a cellular telephone. Conference calling functionality is provided between handsets and expansion base units within the primary base unit. Data services can also be provided by a wireless expansion base unit.
    Type: Grant
    Filed: January 8, 2003
    Date of Patent: January 24, 2006
    Assignee: VTech Telecommunications, Limited
    Inventors: Douglas Charney, Gordon Ryley
  • Multiple wireless microphone speakerphone system and method
    Patent number: 6987992
    Abstract: A multiple wireless microphone speakerphone system includes one or more wireless microphones. The wireless microphones accept speech and transmit the speech to receivers, one receiver corresponding to each wireless microphone. Audio processing and acoustic echo cancellation (AEC) are performed on the received speech signals. A signal handling unit generates an audio signal after echo cancellation. The generated audio signal is transmitted to a far end to be played through, for example, a speaker or an ear piece.
    Type: Grant
    Filed: January 8, 2003
    Date of Patent: January 17, 2006
    Assignee: VTech Telecommunications, Limited
    Inventors: Sukhdeep S. Hundal, Supajet Guy Pothiboon
  • Impedeance matching circuit for a multi-band radio frequency device
    Patent number: 6985698
    Abstract: In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: January 10, 2006
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Sudhir Aggarwal, Matthias Locher