Patents Assigned to Broadcom Corporations
  • Apparatus and method for hybrid decoding
    Publication number: 20050286657
    Abstract: Typical communication systems operate with a single channel decoder, and hence would have to settle for the performance from the single channel decoder regardless of the conditions of the communications channel. The present invention uses a hybrid channel decoder comprising multiple channel decoders, each configured to optimize the quality of the re-constructed signal for different channel conditions. Therefore, the desired decoder can be selected as conditions of the communications channel, or the data signal, change over time, so as to optimize the re-constructed data signal. In embodiments, the data signal is a speech signal.
    Type: Application
    Filed: February 3, 2005
    Publication date: December 29, 2005
    Applicant: Broadcom Corporation
    Inventors: Jes Thyssen, Juin-Hwey Chen, Nambi Seshadri
  • Differential delay compensation and measurement in bonded systems
    Publication number: 20050286424
    Abstract: A method for determining differential delay of at least two bonded links is described. The method comprises a step of providing, on the part of a transmitting entity, at least some of the data packets transmitted from the transmitting entity to a receiving entity with time stamps, the time stamps indicating a point of time when a respective data packet has been generated, and a step of deriving a propagation delay from a time stamp of a data packet and a time of arrival of the data packet at a receiving entity. The method further comprises a step of determining a differential delay of a link from the propagation delay of the link and a propagation delay of a reference link.
    Type: Application
    Filed: June 9, 2005
    Publication date: December 29, 2005
    Applicant: Broadcom Corporation
    Inventors: Miguel Peeters, Raphael Cassiers, Benoit Christiaens
  • Software implementing parts of a blanking interval encoder/decoder
    Publication number: 20050285975
    Abstract: A blanking interval information decoder is described, with the blanking interval decoder being adapted for decoding blanking interval information transmitted in a video signal. The blanking interval information decoder comprises a processing unit, a memory adapted for storing at least one of code and data, and a set of blanking interval decoding routines stored in the memory. Each of the blanking interval decoding routines is adapted for decoding a certain type of blanking interval information of a certain video standard.
    Type: Application
    Filed: June 23, 2005
    Publication date: December 29, 2005
    Applicant: Broadcom Corporation
    Inventors: Evgeny Spektor, Gennady Mayko, Ronit Hadar, Alon Rachmani
  • Data integrity checking
    Publication number: 20050289436
    Abstract: A tester unit for evaluating data integrity of a block of data is described. The tester unit comprises a checksum determination facility adapted for deriving a checksum value from a block of data stored in a memory, and a checksum evaluation facility adapted for comparing the derived checksum value with a predetermined checksum value, and for initiating a reload of the block in case the derived checksum value differs from the predetermined checksum value.
    Type: Application
    Filed: August 30, 2004
    Publication date: December 29, 2005
    Applicant: Broadcom Corporation
    Inventor: John Redford
  • Video data processing circuits and systems comprising programmable blocks or components
    Publication number: 20050289507
    Abstract: The invention refers to a video data processing system and a video data processing circuit, comprising at least two functional blocks of which at least a first functional block is programmable so that different functions can be provided by said first functional block.
    Type: Application
    Filed: March 7, 2005
    Publication date: December 29, 2005
    Applicant: Broadcom Corporation
    Inventors: Evgeny Spektor, Gili Elias
  • Radio transceiver card communicating in a plurality of frequency bands
    Patent number: 6980161
    Abstract: A card includes in a radio transceiver that communicates in first and second frequency bands. First and second antennas are in the card and are coupled to the radio transceiver. A microprocessor in the card selects one of the first and second antennas.
    Type: Grant
    Filed: March 12, 2004
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventors: Patrick W. Kinney, Ronald L. Mahany, Guy J. West
  • Rate adaptation and parameter optimization for multi-band single carrier transmission
    Patent number: 6980601
    Abstract: A method for enhancing the bit rate and/or margin at which quadrature amplitude modulation (QAM) communication is performed over multiple bands of a communication link includes the steps of varying a spectral allocation and constellation size with which communication is performed, so as to define a combination of spectral allocation and constellation size at which the bit rate and/or margin are enhanced. The rate adaptation method identifies the spectral allocation and constellation size to use on each of the multiple bands that results in a total bit rate greater than or equal to the target bit rate, subject to specified constraints on SNR margin and/or BER limits. If more than one parameter set has this property, the rate adaptation method may for example select the spectral allocation and constellation size combination that maximizes the minimum SNR margin across the multiple bands.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventor: David Charles Jones
  • Voice and data exchange over a packet based network with comfort noise generation
    Patent number: 6980528
    Abstract: A signal processing system which discriminates between voice signal and data signals modulated by a voiceband carrier. The signal processing system includes a voice exchange, a data exchange and a call discriminator. The voice exchange is capable of exchanging voice signals between a switched circuit network and a packet based network. The signal processing system also includes a data exchange capable of exchanging data signals modulated by a voiceband carrier on the switched circuit network with unmodulated data signal packets on the packet based network. The data exchange is performed by demodulating data signals from the switched circuit network for transmission on the packet based network, and modulating data signal packets from the packet based network for transmission on the switched circuit network. The call discriminator is used to selectively enable the voice exchange and data exchange.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventors: Wilf LeBlanc, Shawn Stevenson, Wing Yee Winnie Lee
  • System and method for slot based ARL table learning with concurrent table search using write snoop
    Patent number: 6981058
    Abstract: A network device including at least one network port, a clock, address resolution logic (ARL) tables, and address resolution logic. The clock generates a timing signal. The ARL tables are configured to store and maintain data related to port addresses of the network device. The address resolution logic is coupled to the ARL tables and the clock, and configured to search the ARL tables and to perform learning concurrently during alternating slots of the timing signal. Upon receiving a data packet at the at least one port, the address resolution logic is configured to search the ARL tables for a destination address based on the data packet. When the destination address is found, the address resolution logic is configured to update a related record of the ARL tables based on the learning, the address resolution logic configured to perform searches and updates.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventors: Jonathan Lin, David Billings
  • Descriptor-based load balancing
    Patent number: 6981074
    Abstract: A multiprocessor switching device substantially implemented on a single CMOS integrated circuit is described in connection with a descriptor-based packet processing mechanism for use in efficiently assigning and processing packets to a plurality of processors. A plurality of descriptors associated with each packet transfer are written back to memory in order, divided into subset groups and assigned to processors, where each processor searches the assigned subset for EOP and associated SOP descriptors to process.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventors: Koray Oner, Jeremy Dion
  • System and method for noise cancellation in a signal processing circuit
    Patent number: 6980145
    Abstract: A system and method for noise cancellation in a signal-processing circuit (e.g., an analog-to-digital converter circuit). Various aspects of the present invention may comprise inputting a first input signal and a digital input signal to the signal-processing circuit. The digital input signal may, for example, comprise a digital dither signal or other processor control signal. The signal-processing circuit may, for example, output a signal comprising a first signal component that is primarily a function of the first input signal and a second signal component that is primarily a function of the digital input signal. The second signal component may be estimated based on estimated behavior of the signal-processing circuit in response to the digital input signal. The estimated second signal component may, for example, be substantially removed from the signal-processing circuit output signal.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventor: Anil Tammineedi
  • Noise feedback coding method and system for performing general searching of vector quantization codevectors used for coding a speech signal
    Patent number: 6980951
    Abstract: A method of searching a plurality of Vector Quantization (VQ) codevectors for a preferred one of the VQ codevectors to be used as an output of a vector quantizer for encoding a speech signal, includes determining a quantized prediction residual vector, and calculating a corresponding unquantized prediction residual vector and the energy of the difference between these two vectors (that is, a VQ error vector).
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventor: Juin-Hwey Chen
  • Adaptable voltage control for a variable gain amplifier
    Patent number: 6980053
    Abstract: A method and apparatus for adaptively controlling a variable gain amplifier (VGA). The operation of the VGA is separated into a low gain mode and a high gain mode and the mode in which the VGA is currently operating in is adaptively sensed. A threshold voltage is compared to a control voltage of the VGA; if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, the VGA is switched from the low gain mode to the high gain mode; and if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage, the VGA is switched from the high gain mode to the low gain mode.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: December 27, 2005
    Assignee: Broadcom Corporation
    Inventors: Mario Caresosa, Guangming Yin
  • Motherboard with video data processing card capability
    Publication number: 20050283559
    Abstract: The motherboard comprises a CPU and a memory component; further at least one video data processing chip mounted to the motherboard wherein the video data processing chip is programmable; and further at least one additional memory component provided to store a software that is executable by the video data processing chip.
    Type: Application
    Filed: June 16, 2005
    Publication date: December 22, 2005
    Applicant: Broadcom Corporation
    Inventor: Eli Arad
  • Split source RF MOSFET device
    Publication number: 20050280096
    Abstract: An RF MOS transistor having improved AC output conductance and AC output capacitance includes parallel interdigitated source and drain regions separated by channel regions and overlying gates. Grounded tap regions contacting an underlying well are placed contiguous to source regions and reduce distributed backgate resistance, lower backgate channel modulation, and lower output conductance.
    Type: Application
    Filed: August 25, 2005
    Publication date: December 22, 2005
    Applicant: Broadcom Corporation
    Inventors: Thomas McKay, Stephen Allott
  • System for and method of performing an opacity calculation in a 3D graphics system
    Patent number: 6977658
    Abstract: A system, device and method are disclosed for predicting the opacity of primitives used to produce an image using one or more equations, prior to producing an image. More specifically, the present invention relates to a 3D device adapted to produce an image comprising an opacity estimate predictor adapted to predict opacity of at least one primitive using at least one first equation and further adapted to reject the primitive if the predicted opacity is equal to a minimum value.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: December 20, 2005
    Assignee: Broadcom Corporation
    Inventor: Charles Monahan
  • Testing of integrated circuits from design documentation
    Patent number: 6978216
    Abstract: One or more methods and systems of validating the operation of one or more register designs are presented. In one embodiment, the system utilizes a processor, an integrated circuit design simulator software, a storage media, a storage device, user interface, and a display. In one embodiment, the method includes executing a set of instructions operating on a register design parameter file to produce an output that is easily incorporated into the integrated circuit design simulator software. The output specifies one or more tests to be performed using the integrated circuit design simulator software. The one or more tests are subsequently performed to validate the register design. The method automates the incorporation of register design parameters into the integrated circuit design simulator software by way of executing a set of instructions that operates on the register design parameter file.
    Type: Grant
    Filed: November 7, 2003
    Date of Patent: December 20, 2005
    Assignee: Broadcom Corporation
    Inventor: James D. Sweet
  • Low-error fixed-width modified booth multiplier
    Patent number: 6978426
    Abstract: A low-error fixed-width multiplier receives a W-bit input and produces a W-bit product. In an embodiment, a multiplier (Y) is encoded using modified Booth coding. The encoded multiplier (Y) and a multiplicand (X) are processed together to generate partial products. The partial products are accumulated to generate a product (P). To compensate for the quantization error, Booth encoder outputs are used for the generation of error compensation bias. The truncated bits are divided into two groups, a major least significant bit group and a minor least significant bit group, depending upon their effects on the quantization error. Different error compensation methods are applied to each group.
    Type: Grant
    Filed: August 30, 2002
    Date of Patent: December 20, 2005
    Assignee: Broadcom Corporation
    Inventors: Keshab K. Parhi, Jin-Gyun Chung, Kwang-Cheol Lee, Kyung-Ju Cho
  • Fully differential input buffer with wide signal swing range
    Patent number: 6977526
    Abstract: A squeezable tail current source for use in a differential operational amplifier is disclosed that regulates the current through a main input differential pair while preventing output distortion and allowing high linearity. The squeezable tail current source includes a first transistor pair that replicates a main input transistor pair, wherein both the first transistor pair and the main input transistor pair receive a common voltage input at their respective gates. The squeezable tail current source also includes a second transistor pair, a bias transistor, a first current source, a folding transistor, and a second current source that biases the folding transistor. These components are configured such that current through the main input transistor pair is maintained as the voltage input varies.
    Type: Grant
    Filed: January 22, 2004
    Date of Patent: December 20, 2005
    Assignee: Broadcom Corporation
    Inventor: Hung-Sung Li
  • Bit rate automatic gear
    Publication number: 20050276324
    Abstract: A method for controlling a video stream bit rate while encoding a macroblock of a video stream having pictures comprising the step of using a quantiser_scale_code of the general form: quantiser—scale—code=ROUND(A+B(D+logC(MIN{VAR[luma—0], . . . ,VAR[luma—n]}))) with A being an adjustable gear shift parameter; and B being an adjustable gas pedal parameter; and [luma_n] being a nth luminance block of said macroblock; and D being a constant parameter depending on the encoded picture type.
    Type: Application
    Filed: June 14, 2005
    Publication date: December 15, 2005
    Applicant: Broadcom Corporation
    Inventor: Itzik Yankilevich