Patents Assigned to Broadcom Corporation
  • Patent number: 7535476
    Abstract: Provided is a method and system for performing color look-up table (CLUT) and gamma correction for video pixel data. A system includes a memory configured for storing CLUT parameters and gamma correction parameters therein. Also included is an input matrix coupled to the memory and configured to receive first and second type pixel data. The memory receives the first type pixel as an address to the stored CLUT parameters and receives the second type pixel data as an address to the stored gamma correction parameters.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Chengfuh Jeffrey Tang, Yao-Hua Steven Tseng, Hsien-Chih Jim Tseng
  • Patent number: 7536167
    Abstract: Improved apparatus for a radio communication system having a multiplicity of mobile transceiver units selectively in communication with a plurality of base transceiver units which, in turn, communicate with one or more host computers for storage and manipulation of data collected by bar code scanners or other collection means associated with the mobile transceiver units. A network controller and an adapter which has a simulcast and sequential mode provide selective interface between host computers and base transceivers. A scheme for routing data through the communication system is also disclosed wherein the intermediate base stations are organized into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Charles D. Gollnick, Ronald E. Luse, John G. Pavek, Marvin L. Sojka, James D. Cnossen, Arvin D. Danielson, Ronald L. Mahany, Mary L. Detweiler, Gary N. Spiess, Guy J. West, Amos D. Young, Robert C. Meier, Keith K. Cargin, Jr., Richard C. Arensdorf, Robert G. Geers
  • Patent number: 7535836
    Abstract: Aspects of the invention utilize a secondary communication channel to conduct flow control at the word level. As a result, the overhead associated with flow control can be reduced, as well as the risk of buffer overflow. In one embodiment, embedded flow control information is encoded as reversed running disparity codes in each transmission lane. Additional control symbols may be coded by grouping a series of specially coded data words or inspecting a selected data word at regular intervals.
    Type: Grant
    Filed: August 20, 2003
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventor: Martin Lund
  • Patent number: 7535921
    Abstract: Disclosed herein is a redundant network and communication protocol at least including host computers, RF base stations, and roaming terminals. The network may utilize a polling communication protocol such that under heavy traffic conditions, a roaming terminal wishing to initiate communication may be required to determine whether the channel is clear by listening for an entire interpoll gap time. When a hidden terminal is communicating, the roaming terminal may conclude that the communication is taking place upon receiving a polling frame directed to the hidden terminal from the normally silent base station. Inherent redundancy techniques may be used with a spanning tree approach for determining the most efficient pathways from a source to a destination and ensuring that the network adapts to spatial changes or breakdowns within the network.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventor: Robert C. Meier
  • Patent number: 7535969
    Abstract: A system and method for generating transmit weighting values for signal weighting that may be used in various transmitter and receiver structures is disclosed herein. The weighting values are determined as a function of frequency based upon a state of a communication channel and the transmission mode of the signal. In variations, weighting of the weighted signal that is transmitted through each of a plurality of antennas is carried out with one of a corresponding plurality of transmit antenna spatial weights. In these variations, a search may be conducted over various combinations of transmit weighting values and transmit antenna spatial weights in order to find a weight combination that optimizes a performance measure such as the output signal-to-noise ratio, the output bit error rate or the output packet error rate.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Severine Catreux, Vinko Erceg, Pieter Roux, Pieter van Rooyen, Jack Winters
  • Patent number: 7535976
    Abstract: A receiver to process a RF input signal having a plurality of channels includes a direct down conversion circuit, a demodulation circuit, and a local oscillator circuit. The direct down conversion circuit provides a downconverted signal based on the RF input signal and a local oscillator signal. The demodulation circuit receives the downconverted signal and provides a demodulated signal. The local oscillator circuit sets a frequency of the local oscillator signal based on a selected channel of the plurality of channels.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Steven Jaffee, Donald McMullin, Ramon Gomez
  • Patent number: 7535980
    Abstract: This invention provides channel dispersion estimation algorithm(s). This channel dispersion estimation algorithm(s) may be implemented within a channel length estimation module of a single-branch or multi-branch equalizer processing module that enables interference cancellation when the channel length or channel delay spread associated with received radio frequency (RF) bursts compares unfavorably to predetermined thresholds. The channel dispersion estimation algorithm identifies when the radio frequency (RF) bursts have a channel length or channel delay spread that can affect receiver performance. The channel length estimation module may disable interference cancellation in response to such a channel length or channel delay spread. Additionally, the channel length estimation module may adjust the number of equalizer states for the single-branch or first branch of a multi-branch equalizer based the channel length or channel delay spread.
    Type: Grant
    Filed: June 13, 2005
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Baoguo Yang, Huaiyu (Hanks) Zeng
  • Patent number: 7536177
    Abstract: A system and method for providing enhanced caller identification (caller ID) information to a user is described. A broadband access gateway communicatively coupled to a plurality of access devices may collect information about multimedia content available on the access devices and/or information exchanged with access devices. The gateway may search the collect information upon receiving information identifying a called or calling party, to find information that may be associated with the called or calling party. Selected items of the information associated with the called or calling party may then be delivered to the access device of the called or calling party. Information accessible to the gateway via a broadband connection may also be made available to the user of the access device.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Jeyhan Karaoguz, Marc Abrams, Nambirajan Seshadri
  • Patent number: 7536629
    Abstract: Construction of LDPC (Low Density Parity Check) codes using GRS (Generalized Reed-Solomon) code. A novel approach is presented by which a GRS code may be employed to generate a wide variety of types of LDPC codes. Such GRS based LDPC codes may be employed within various types of transceiver devices implemented within communication systems. This approach may be employed to generate GRS based LDPC codes particular designed for various application arenas. As one example, such a GRS based LDPC code may be specifically designed for use in communication systems that operate in accordance with any standards and/or recommended practices of the IEEE P802.3an (10GBASE-T) Task Force.
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Ba-Zhong Shen, Scott Richard Powell, Kelly Brian Cameron, Hau Thien Tran
  • Patent number: 7535972
    Abstract: A programmable transmitter generates a frame in a frame format according to one of a plurality of operating modes using a frame structure table storing a respective frame format for each of the operating modes. The transmitter includes a frame structure engine that receives a mode selection signal indicative of a select operating mode, and accesses the frame structure table to determine the frame format of the select operating mode. The frame structure engine produces a control signal to a frame generator to control the generation of a frame in the frame format of the select operating mode.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Joachim S. Hammerschmidt, Bruce E. Edwards, Venkat Kodavati, R. Tushar Moorti, Ling Su, Jason A. Trachewsky, Andrew Wagner
  • Patent number: 7535978
    Abstract: A method for accurate signal detection begins by receiving a radio frequency signal, which is then converted into baseband signals. The processing then continues by performing a normalized auto correlation on the down-converted baseband signal to produce a normalized auto correlation signal. The process continues by performing a periodic pattern detection on the down-converted baseband signal to produce a normalized detected periodic signal. The process then continues by comparing the normalized auto correlation value with an auto correlation threshold and by comparing the normalized detected periodic signal with a set of thresholds. When the normalized auto correlation value compares favorably with the auto correlation threshold and when the normalized detected periodic signal compares favorably with the set of thresholds, the down-converted baseband signal is indicated to be a valid signal.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: May 19, 2009
    Assignee: Broadcom Corporation
    Inventors: Jason A. Trachewsky, Alan Corry
  • Publication number: 20090122845
    Abstract: A hybrid circuit without inductors is provided. Embodiments can be used in high-speed communication devices, including Cable modem and Digital Subscriber Line (DSL) devices. In particular, embodiments can be used in Very High Speed DSL (VDSL) devices. Embodiments provide a cheap and compact solution to the echo rejection problem in high-speed communication devices. Furthermore, embodiments perform at least comparably to conventional solutions with respect to key performance measures.
    Type: Application
    Filed: November 14, 2007
    Publication date: May 14, 2009
    Applicant: Broadcom Corporation
    Inventor: Fang Lin
  • Publication number: 20090122846
    Abstract: Enhanced channel changing within multi-channel communication systems. A CMTS directs channel changing of a CM, sometimes between upstream data bursts. Logical channels, part of a single frequency channel, may be used, and the channel changing may be performed between those logical channels. Multiple upstream burst profiles and/or modulation densities may be used providing high degrees of robustness, fidelity, and throughput and allowing great channel flexibility. A CM may be switched between channels without losing transmitter capability. Even if some throughput rate may be sacrificed during the channel changing, the CM will still be able to continue data throughput. Then, the new channel may then undergo the initialization and ranging processes thereby enabling greater throughput on that new channel. After undergoing the initialization and ranging processes, the new channel will then be a fully equivalent member of the CM communication system.
    Type: Application
    Filed: February 29, 2008
    Publication date: May 14, 2009
    Applicant: Broadcom Corporation
    Inventors: Thomas J. Kolze, Bruce J. Currivan
  • Publication number: 20090121910
    Abstract: Provided is a method and system for controlling current characteristics in a transceiver having a transmitter. The method includes identifying a phase control signal from an adjacent current cell preceding the particular current cell in time and logically ORing the phase control signal from the preceding cell with a phase control signal from the particular current cell.
    Type: Application
    Filed: September 4, 2008
    Publication date: May 14, 2009
    Applicant: Broadcom Corporation
    Inventors: Yee Ling Cheung, Kevin T. Chan, Jan Mulder
  • Publication number: 20090125746
    Abstract: An integrated circuit includes a substrate. A first integrated circuit die includes a first circuit and a first intra-chip clock interface that transmits a first clock signal via the substrate. A second integrated circuit die includes a second circuit that operates based on the first clock signal and a second intra-chip clock interface that recovers the first clock signal from the substrate.
    Type: Application
    Filed: January 12, 2009
    Publication date: May 14, 2009
    Applicant: Broadcom Corporation
    Inventor: Ahmadreza (Reza) Rofougaran
  • Publication number: 20090121793
    Abstract: A phase locked loop (PLL) includes a detector, a charge pump, a loop filter, a voltage controlled oscillator (VCO), a divider, and a frequency change module. The detector provides a phase difference based on a reference signal and a feedback signal. The charge pump provides a charge based on the phase difference. The loop filter provides a voltage based on the charge. The VCO provides an output signal based on the voltage received from the loop filter. The divider divides a frequency of the output signal by a value to provide the feedback signal. The frequency change module processes an input signal having a first frequency to provide a processed signal having a second frequency that is different from the first frequency. The frequency change module selects the input signal or the processed signal to provide as the reference signal to the detector. Changing the frequency of the reference signal can change a frequency of a spur.
    Type: Application
    Filed: January 12, 2009
    Publication date: May 14, 2009
    Applicant: Broadcom Corporation
    Inventor: Hung-Ming Chien
  • Publication number: 20090125652
    Abstract: A physical layer device (PLD), comprising: a first serializer-deserializer (SERDES) device having a first parallel port; a second SERDES device having a second parallel port; a third SERDES device having a third parallel port; and a path selector being selectively configurable to provide either (i) a first signal path between the first and second parallel ports, or (ii) a second signal path between the first and third parallel ports.
    Type: Application
    Filed: January 8, 2008
    Publication date: May 14, 2009
    Applicant: Broadcom Corporation
    Inventor: Gary S. Huff
  • Publication number: 20090122698
    Abstract: An apparatus comprising a virtual queue configured to virtually receive virtual data units as the data units are actually received by a real queue. In various embodiments, the virtual queue may include a committed token counter (CTC) configured to represent a number of bytes available to be allocated to a committed burst having a maximum size. In such an embodiment, the virtual queue may include an excess token counter (ETC) configured to represent a number of bytes available to be allocated to an excess burst having a maximum size. In one embodiment, a token counter incrementer configured to, as an exiting data unit virtually exits the virtual queue, increment either the committed token counter or the excess token counter.
    Type: Application
    Filed: October 16, 2008
    Publication date: May 14, 2009
    Applicant: Broadcom Corporation
    Inventors: Ashvin Lakshmikantha, Mohan Kalkunte, Bruce Kwan
  • Patent number: 7533402
    Abstract: An integrated receiver with dual channel transport stream decoding and delivery substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides multiple time-base clocks for two transport streams. Transport processor circuitry uses multiple PCRs to track transport streams through decoding, storage and or delivery of the decoded signals for display. Provision of a multiple time-base clock for decoding and delivering multiple transport streams allows display of the two decoded audio-video signals on independent monitors.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: May 12, 2009
    Assignee: Broadcom Corporation
    Inventors: Jason Demas, Honman Law, David Baer, Brian Schoner
  • Patent number: 7532904
    Abstract: A method for adaptive piconet protocol begins by determining, by a master device, a number of slave devices that are currently affiliated with the master device in a piconet. The method continues by determining, by the master device, data requirements and voice requirements of each of the slave devices currently affiliated with the master device in the piconet. The method continues by establishing, by the master device, an information exchange format based on the number of slave devices, the data requirements of each of the slave devices, and the voice requirements of each of the slave devices. The information exchange format includes at least one multiple frequency locked partial packets for slave data responses to a single master data request packet, multiple frequency locked packets for slave voice responses to a single master voice request packet, and non-restrictive slot positioning of the single master data request and of the signal master voice request.
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: May 12, 2009
    Assignee: Broadcom Corporation
    Inventor: Jason (Ming) Yu Lin