Patents Assigned to Sigmatel
  • Publication number: 20090212739
    Abstract: A method of charging a battery includes applying a charging current from a semiconductor device to the battery during a first battery charging time period. The method also includes measuring a charging voltage level at the battery during the first battery charging time period. During a non-charging voltage measurement time interval, the method includes temporarily stopping application of the charging current from the semiconductor device to the battery and measuring a non-charging voltage level at the battery while the charging current is not being applied to the battery.
    Type: Application
    Filed: January 27, 2009
    Publication date: August 27, 2009
    Applicant: SIGMATEL, INC.
    Inventors: Matthew Felder, Russell A. Schultz
  • Patent number: 7577419
    Abstract: A digital mixer system and method is disclosed. In an embodiment, a digital mixer can receive a modulated signal having a sample rate approximately equal to a clock rate divided by an integer factor. The digital mixer can include a first mixing stage having a first plurality of Coordinate Rotation Digital Computer (CORDIC) elements to serially perform a predetermined number of consecutive CORDIC iterations per clock cycle. The first mixing stage can further have logic to selectively process data received from an output of the first mixing stage. The digital mixer can also include a second mixing stage having a second plurality of CORDIC elements to serially perform a number of consecutive CORDIC iterations per clock cycle. The second mixing stage can also have logic to selectively process data received from an output of the first mixing stage and from an output of the second mixing stage.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: August 18, 2009
    Assignee: Sigmatel, Inc.
    Inventor: Jeffrey Donald Alderson
  • Patent number: 7574590
    Abstract: A method for booting a system on a chip (IC) integrated circuit includes reading a warm boot flag stored in a persistent register of an analog portion of the system on a chip IC. A warm boot procedure is executed when the warm boot flag is set.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: August 11, 2009
    Assignee: Sigmatel, Inc.
    Inventors: David Moore, Matthew Brady Henson, Marc Kevin Jordan
  • Publication number: 20090175342
    Abstract: Methods and systems for image processing are provided. A particular method includes receiving a video object plane (VOP) at an image processing device and decoding the received VOP. The method also includes storing an order number of the decoded VOP at a P-VOP queue in a memory of the image processing device when the received VOP is a predictive coded VOP (P-VOP). The method further includes storing the order number of the decoded VOP at a first available location of a display ordered read queue in the memory of the image processing device when the received VOP is not a P-VOP.
    Type: Application
    Filed: March 18, 2009
    Publication date: July 9, 2009
    Applicant: SigmaTel, LLC (formerly known as SigmaTel, Inc.)
    Inventors: Chin-Long Lin, Ren-Yuh Wang
  • Patent number: 7555591
    Abstract: The disclosure is directed to a computational system including a processor, cache memory accessible to the processor, and a memory management unit accessible to the processor. The processor is configured to access a virtual memory space to perform a first task and is configured to access the virtual memory space to perform a second task. The virtual memory space references first and second sets of task instructions associated with the first and second tasks, respectively. The virtual memory space references non-instruction data associated with the first task. The cache memory is configured to store the first set of task instructions and the non-instruction data. The memory management unit is configured to determine the physical memory location of the second set of task instructions. The computational system is configured to not write the first set of task instructions and the non-instruction data to a physical location beyond the cache memory.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: June 30, 2009
    Assignee: Sigmatel, Inc.
    Inventors: Russell Alvin Schultz, David A. Moore, Matthew Henson
  • Patent number: 7543186
    Abstract: The disclosure is directed to a method of loading a breakpoint enabled page of a computer program into a computer readable memory. The method includes identifying a page of a computer program to be loaded into the computer readable memory and reading a breakpoint table to identify a set of breakpoints having memory addresses located within the page of the computer program prior to loading the page of the computer program. Each breakpoint has an instruction address and an instruction storage location. For each of the set of breakpoints, the method includes reading an operating instruction of the page of the computer program located at the instruction address, storing a copy of the operating instruction at the instruction storage location within the breakpoint table, and loading a trap instruction at the instruction address to replace the operating instruction in the page of the computer program to create a breakpoint enabled page of the computer program.
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: June 2, 2009
    Assignee: Sigmatel, Inc.
    Inventor: Russell A. Schultz
  • Patent number: 7535287
    Abstract: A system includes a first semiconductor device, a second semiconductor device, and an external crystal oscillator. The first semiconductor device includes a source voltage output and an external pin input. The first semiconductor device includes a direct current-to-direct current (DC-DC) converter circuit that provides the source voltage output. The second semiconductor device includes a source voltage input that is coupled to the source voltage output of the first semiconductor device and includes a clock signal output. The external crystal oscillator is coupled via an input of the second semiconductor device to a first oscillator clock generation circuit.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: May 19, 2009
    Assignee: Sigmatel, Inc.
    Inventors: Michael R. May, Marcus William May
  • Patent number: 7529878
    Abstract: The disclosure is directed to a computational system including a processor and a memory management unit accessible to the processor. The processor is configured to access a common virtual memory space to perform a first task of a plurality of tasks and is configured to access the common virtual memory space to perform a second task of the plurality of tasks. The common virtual memory space references a first set of instructions associated with the first task and references a second set of instructions associated with the second task. The memory management unit is configured to determine a physical memory location of at least one of the first and second sets of instructions when the associated first or second task is to be performed by the processor.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: May 5, 2009
    Assignee: Sigmatel, Inc.
    Inventors: Russell Alvin Schultz, David A. Moore, Matthew Henson
  • Patent number: 7518661
    Abstract: A system and method for detecting a mode of an audio signal is disclosed. The system includes an integrated circuit with an input to receive a signal and an audio processor coupled to the input. The audio processor includes an audio standard detection module, wherein the audio standard detection module detects a characteristic of the received signal that identifies a television audio standard by measuring the energy level of a plurality of different frequency bands of the received signal.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: April 14, 2009
    Assignee: Sigmatel, Inc.
    Inventor: Jeffrey Donald Alderson
  • Patent number: 7515078
    Abstract: A programmable sample rate ADC includes a delta sigma modulator for producing a digital signal, and a programmable decimation filter, that includes X stages of integration, a down-sampling stage for down-sampling by a factor of N, and Y stages of differentiation. The programmable sample rate ADC produces a digital output signal at a substantially constant frequency.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: April 7, 2009
    Assignee: SigmaTel, Inc
    Inventor: Michael R. May
  • Patent number: 7512720
    Abstract: The disclosure is directed to a computational device including functional circuitry, a transceiver interface that is accessible to the functional circuitry, and a universal serial bus transceiver that is accessible to the transceiver interface and that is configured to couple to a universal serial bus compatible media. The transceiver interface is configured to provide a first set of configuration data including a first power setting to a host device via the universal serial bus transceiver. The universal serial bus transceiver is configured to electrically disconnect from and electrically reconnect to the universal serial bus media in response to a suspension signal. The transceiver interface is also configured to provide a second set of configuration data including a second power setting after electrically reconnecting.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: March 31, 2009
    Assignee: Sigmatel, Inc.
    Inventors: Russell Alvin Schultz, Jean-Charles Pina
  • Patent number: 7508326
    Abstract: A system and method operable to automatically disable input/output signal processing based on the required data format is provided. The need for an input/output module, such as an encoder, required to process input signal having a first data format (i.e. multimedia format) and produce an output signal having a second format (i.e. multimedia format) is determined. When the input/output module is not required to produce the output signal in the second format, the input/output module is disabled.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: March 24, 2009
    Assignee: Sigmatel, Inc.
    Inventors: Daniel Mulligan, David Baker
  • Patent number: 7508686
    Abstract: A method and system to determine a battery mode of an integrated circuit device are presented. The battery mode is selected with respect to first and second direct current to direct current converter devices within the integrated circuit. A voltage is received at a single pin of the device. A battery mode is determined for the device based on the received voltage, and at least one of the direct current to direct current converter circuits is configured based on the determined battery mode.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: March 24, 2009
    Assignee: Sigmatel, Inc.
    Inventor: Marcus W. May
  • Patent number: 7501794
    Abstract: A semiconductor device includes an adjustable current source that is coupled to an external battery. The semiconductor device includes a feedback control module that is responsive to a voltage level at the external battery. The feedback control module also has an output that is directed to control the current supplied by the adjustable current source. Also, the feedback control module can selectively provide a signal to periodically and temporarily turn off the current supplied by the adjustable current source. A voltage at the external battery is measured during a time period when the current is turned on and during a time period when the current is turned off. While the current is turned off, the feedback control module can measure the external battery voltage so that it can be compared to the battery voltage while the adjustable current source is on.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: March 10, 2009
    Assignee: Sigmatel, Inc.
    Inventors: Matthew Felder, Russell A. Schultz
  • Publication number: 20090033527
    Abstract: A system and method for using one or more clock signals is disclosed. The system includes a clock translator that has a first input to receive a first reference clock signal and a second input to receive a second reference clock signal. The clock translator also includes an output to provide a bit rate clock signal having a clock frequency in a first ratio with respect to the frequency of the first reference clock but having a resolution based on at least a portion of the second reference clock signal. The second reference clock has a faster rate than the first reference clock.
    Type: Application
    Filed: October 13, 2008
    Publication date: February 5, 2009
    Applicant: Freescale Semiconductor, Inc. (formerly known as SigmaTel, Inc.)
    Inventor: Darrell Eugene Tinker
  • Publication number: 20090015714
    Abstract: A system and method for demodulating signals are disclosed. In a particular embodiment, the method includes receiving a signal at an input and determining a first noise estimate of the signal. The method also includes providing a first output indicating a second noise estimate of the signal at a primary carrier frequency and providing a second output indicating a third noise estimate of the signal at a secondary carrier frequency.
    Type: Application
    Filed: July 9, 2007
    Publication date: January 15, 2009
    Applicant: SIGMATEL, INC.
    Inventors: Jon David Hendrix, Jeffrey Donald Alderson, Glen Ragan
  • Patent number: 7478084
    Abstract: A remote media player and methods for managing content. The media player includes a storage component to store content files. A user interface allows the user to make content selections. The content selections are used with a content database to manage the relationships between the selections and the content files. The player also includes a processor to perform organization tasks on the content files based upon the content selections.
    Type: Grant
    Filed: January 10, 2006
    Date of Patent: January 13, 2009
    Assignee: Sigmatel Inc.
    Inventor: Mark Ireton
  • Patent number: 7471723
    Abstract: A system and method of transmitting video packets to enhance error concealment and error resilience are provided. The method includes encoding a first macroblock of video data into a video packet. The method also includes determining whether a length of the video packet including the first macroblock exceeds a threshold length. The method also includes encoding a second macroblock into the video packet as the final macroblock when the length of the video packet with the first macrobock exceeds the threshold length. The method also includes transmitting the video packet.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: December 30, 2008
    Assignee: Sigmatel, Inc.
    Inventor: Yi-Yung Jeng
  • Patent number: 7459955
    Abstract: A method and system for sensing the temperature of an integrated circuit are presented. The method compares a first current that is proportional to a temperature reading of the integrated circuit to a reference current. While the first current is greater than the reference current, a counter is incremented, and the reference current is increased in response to incrementing the counter. A system for sensing the temperature of an integrated circuit includes a first current source providing a source current to a node. The first current source is based on an input from a proportional to absolute temperature device. The system also includes a second current source providing a sink current to the node, with the amount of sink current being based on an input from a digital control module. The system also includes a comparator coupled to the node to provide a comparator signal that indicates a relationship between the source current and the sink current.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: December 2, 2008
    Assignee: Sigmatel, Inc.
    Inventor: John Willis
  • Patent number: 7460847
    Abstract: A radio receiver, optionally used in conjunction with a handheld audio system, includes a radio stage for processing a received radio signal into an audio signal. An audio stage produces an audio output, based on the audio signal. An overload monitor detects an overload condition in the radio stage and generates an overload signal in response to the detected overload condition. A controller controls the audio output in response to the overload signal.
    Type: Grant
    Filed: September 1, 2005
    Date of Patent: December 2, 2008
    Assignee: Sigmatel, Inc.
    Inventors: Jon David Hendrix, Thomas Glen Ragan, Michael R. May