Patents by Inventor Mikael Hjelm

Mikael Hjelm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8547950
    Abstract: Embodiments related to acquisition, detection, and processing of a high-frequency signal in a global positioning system are described and depicted.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: October 1, 2013
    Assignee: Infineon Technologies AG
    Inventors: Mikael Hjelm, Joakim Landmark, Andreas Schmid
  • Patent number: 8396206
    Abstract: Embodiments of a multi-channel audio communication device and methods for reducing echoes are generally described herein. Other embodiments may be described and claimed. In some embodiments, echo-reduction circuitry may insert training signals into digital audio signals at or below a noise floor and in a non-audible portion of the frequency spectrum based on a spectral mask. Training signals may be generated from spectrum estimates and training sequences. An adaptive filter may generate echo-cancellation signals using filter coefficients generated fawn the training sequences and return-path signals. The echo cancellation signals may remove echo signals from the return-path signals.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: March 12, 2013
    Assignee: Infineon Technologies AG
    Inventors: Simon Jäermyr, Mikael Hjelm
  • Patent number: 8213597
    Abstract: Embodiments of an audio communication device and methods for reducing echoes are generally described herein. Other embodiments may be described and claimed. In some embodiments, echo-reduction circuitry may insert a training signal into digital audio signals at or below a noise floor and in a non-audible portion of the frequency spectrum based on a spectral mask. The training signal may be generated from a spectrum estimate and a training sequence. An adaptive filter may generate an echo-cancellation signal using filter coefficients generated from the training sequence and return-path signals. The echo-cancellation signal may remove echo signals from the return-path signals.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: July 3, 2012
    Assignee: Infineon Technologies AG
    Inventor: Mikael Hjelm
  • Patent number: 7970086
    Abstract: A method for processing a signal includes monitoring an over-sampled signal to detect deviations in a number of fill samples, and providing an electronic delay adjustment to a signal path. If a deviation in the number of fill samples is detected, the electronic delay adjustment from the signal path is removed in one or more steps until all of the electronic delay adjustment is removed from the signal path.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: June 28, 2011
    Assignee: Infineon Technologies AG
    Inventors: Johnny Holmberg, Mikael Hjelm
  • Publication number: 20100279732
    Abstract: Embodiments related to acquisition, detection, and processing of a high-frequency signal in a global positioning system are described and depicted.
    Type: Application
    Filed: May 4, 2009
    Publication date: November 4, 2010
    Inventors: Mikael Hjelm, Joakim Landmark, Andreas Schmid
  • Patent number: 7737730
    Abstract: An integrated circuit includes a first switched capacitor element and a second switched capacitor element, which are coupled to form a bridge circuit, the first switched capacitor element being located in a first branch of the bridge circuit and the second switched capacitor element being located in a second branch of the bridge circuit. A detector circuit is coupled to the first branch and to the second branch of the bridge circuit. Switching signals of the first switched capacitor element and of the second switched capacitor element are generated on the basis of an input clock signal of the integrated circuit.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: June 15, 2010
    Assignee: Infineon Technologies AG
    Inventors: Mikael Hjelm, Charlotta Hedenaes, Bjoern Wiklund
  • Patent number: 7501901
    Abstract: A circuit has a first capacitive circuit component, having a first terminal and a second terminal, and an amplifier, having a first input and an output, the first input coupled to the first terminal and the output coupled to the second terminal to generate a potential difference between the first terminal and the second terminal.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: March 10, 2009
    Assignee: Infineon Technologies AG
    Inventor: Mikael Hjelm
  • Publication number: 20090058468
    Abstract: An integrated circuit includes a first switched capacitor element and a second switched capacitor element, which are coupled to form a bridge circuit, the first switched capacitor element being located in a first branch of the bridge circuit and the second switched capacitor element being located in a second branch of the bridge circuit. A detector circuit is coupled to the first branch and to the second branch of the bridge circuit. Switching signals of the first switched capacitor element and of the second switched capacitor element are generated on the basis of an input clock signal of the integrated circuit.
    Type: Application
    Filed: August 31, 2007
    Publication date: March 5, 2009
    Inventors: Mikael Hjelm, Charlotta Hedenaes, Bjoern Wiklund
  • Publication number: 20090046822
    Abstract: Embodiments for compensating clock drift in a system have been described and depicted.
    Type: Application
    Filed: August 15, 2007
    Publication date: February 19, 2009
    Inventors: Johnny Holmberg, Mikael Hjelm
  • Patent number: 7436249
    Abstract: A circuit for filtering a radio frequency signal at a given frequency comprises an input terminal, a filter device, and an active AC shunt circuit having first and second input terminals and an output terminal, where the first input terminal of the active AC shunt circuit is connected to the input terminal. The filter device is connected between the input terminal and the second input terminal of the active AC shunt circuit, and is provided for attenuating the radio frequency signal at the given frequency to the second input terminal of the active AC shunt circuit. The active AC shunt circuit is provided for shunting a signal at a frequency other than the given frequency as contained in the radio frequency signal to ground, and for outputting the radio frequency signal as filtered at its output terminal.
    Type: Grant
    Filed: August 22, 2006
    Date of Patent: October 14, 2008
    Assignee: Infineon Technologies AG
    Inventor: Mikael Hjelm
  • Patent number: 7436236
    Abstract: Arrangement for analog compensation of a DC component in an AC signal having an estimator for producing an estimate corresponding to the DC component, a compensator for producing a present compensating signal according to the estimate, an adder for adding the present compensating signal to the AC signal, and a comparator for continuously comparing the present estimate with the present compensating signal. If the difference between the present estimate and the present compensating signal lies outside of a predefined interval, then the comparator triggers the compensator to produce an updated compensating signal according to the present estimate, and to switch from the present compensating signal to the updated compensating signal, and the adder adds the updated compensating signal to the AC signal. If the difference lies within the predefined interval, then the compensator continues to produce the present compensating signal, and the adder adds the present compensating signal to the AC signal.
    Type: Grant
    Filed: June 3, 2005
    Date of Patent: October 14, 2008
    Assignee: Infineon Technologies AG
    Inventor: Mikael Hjelm
  • Patent number: 7434143
    Abstract: A method and an arrangement for detecting a collision in a communication network, such as a WLAN, on which data are sent in frames of variable lengths separated by inter-frame spaces, each frame including a header and a data payload field where the header includes information of the length of the frame, is provided. The method comprises the steps of estimating a noise level (41; 41-42) of a frame, the header of which being read by a receiver, preferably using constellation error measurement, comparing the estimated noise level with a reference noise level value, and detecting a collision with another weaker frame depending on the outcome of the comparison.
    Type: Grant
    Filed: June 15, 2004
    Date of Patent: October 7, 2008
    Assignee: Infineon Technologies AG
    Inventors: Michael Lewis, Mikael Hjelm
  • Publication number: 20080198778
    Abstract: Embodiments of an audio communication device and methods for reducing echoes are generally described herein. Other embodiments may be described and claimed. In some embodiments, echo-reduction circuitry may insert a training signal into digital audio signals at or below a noise floor and in a non-audible portion of the frequency spectrum based on a spectral mask. The training signal may be generated from a spectrum estimate and a training sequence. An adaptive filter may generate an echo-cancellation signal using filter coefficients generated from the training sequence and return-path signals. The echo-cancellation signal may remove echo signals from the return-path signals.
    Type: Application
    Filed: February 15, 2007
    Publication date: August 21, 2008
    Applicant: INFINEON TECHNOLOGIES
    Inventor: Mikael Hjelm
  • Publication number: 20080198779
    Abstract: Embodiments of a multi-channel audio communication device and methods for reducing echoes are generally described herein. Other embodiments may be described and claimed. In some embodiments, echo-reduction circuitry may insert training signals into digital audio signals at or below a noise floor and in a non-audible portion of the frequency spectrum based on a spectral mask. Training signals may be generated from spectrum estimates and training sequences. An adaptive filter may generate echo-cancellation signals using filter coefficients generated fawn the training sequences and return-path signals. The echo cancellation signals may remove echo signals from the return-path signals.
    Type: Application
    Filed: February 15, 2007
    Publication date: August 21, 2008
    Applicant: INFINEON TECHNOLOGIES AGST.
    Inventors: Simon Jaermyr, Mikael Hjelm
  • Publication number: 20080068095
    Abstract: A circuit has a first capacitive circuit component, having a first terminal and a second terminal, and an amplifier, having a first input and an output, the first input coupled to the first terminal and the output coupled to the second terminal to generate a potential difference between the first terminal and the second terminal.
    Type: Application
    Filed: August 29, 2006
    Publication date: March 20, 2008
    Inventor: Mikael Hjelm
  • Publication number: 20080070618
    Abstract: A cellular-communications device comprises a cellular-communications transceiver to communicate via a cellular-communications system; a local-communications transceiver to communicate via a local-communications system; and a switch coupled to said local-communications transceiver to switch it on when a probability value indicates, that said cellular-communications device is within a communications range of a base station of said local-communications system. A communications method comprises providing communication via a cellular-communications system; and switching on communication via a local-communications system when within a communications range of a base station of said local-communications system based a probability value.
    Type: Application
    Filed: September 15, 2006
    Publication date: March 20, 2008
    Inventor: Mikael Hjelm
  • Publication number: 20070205813
    Abstract: A circuit for reducing jitter and/or phase jump problems in a clock amplifier device due to variations in the voltage supplied to the clock amplifier device has an input terminal connected to the supply voltage to allow the circuit to sense the actual supply voltage, and an output terminal connected to an output of the clock amplifier device. The circuit is provided to draw a current from, or feed a current to, the output of the clock amplifier device via the output terminal in response to a difference between the sensed actual supply voltage and a desired supply voltage. The circuit is preferably implemented in a first stage of a CMOS inverter chain in a GPS navigator device.
    Type: Application
    Filed: February 13, 2007
    Publication date: September 6, 2007
    Applicant: Infineon Technologies AG
    Inventor: Mikael Hjelm
  • Patent number: 7231215
    Abstract: In a packet-based communication network a central control unit indicates its presence on the first channel by in addition to data traffic transmits regular beacons with a specified time interval, and upon detecting radar signals on a first channel the central control unit transmits a channel switch message and immediately switches to a second channel and resumes data traffic on that second channel, thereafter repeatedly transmitting a channel switch message on the first channel and a beacon on the second channel by switching back to the first channel to transmit second channel switch messages (either contained in beacons or separately) and switching back to the second channel to transmit regular beacons for each permissible beacon transmission time slot, until as many devices as possible associated with the central control unit has followed to the second channel.
    Type: Grant
    Filed: November 7, 2003
    Date of Patent: June 12, 2007
    Assignee: Infineon Technologies Wireless Solutions Sweden AB
    Inventors: Michael Lewis, Mikael Hjelm
  • Publication number: 20070054647
    Abstract: A circuit for filtering a radio frequency signal at a given frequency comprises an input terminal, a filter device, and an active AC shunt circuit having first and second input terminals and an output terminal, where the first input terminal of the active AC shunt circuit is connected to the input terminal. The filter device is connected between the input terminal and the second input terminal of the active AC shunt circuit, and is provided for attenuating the radio frequency signal at the given frequency to the second input terminal of the active AC shunt circuit. The active AC shunt circuit is provided for shunting a signal at a frequency other than the given frequency as contained in the radio frequency signal to ground, and for outputting the radio frequency signal as filtered at its output terminal.
    Type: Application
    Filed: August 22, 2006
    Publication date: March 8, 2007
    Applicant: Infineon Technologies AG
    Inventor: Mikael Hjelm
  • Publication number: 20050271163
    Abstract: Arrangement for analog compensation of a DC component in an AC signal having an estimator for producing an estimate corresponding to the DC component, a compensator for producing a present compensating signal according to the estimate, an adder for adding the present compensating signal to the AC signal, and a comparator for continuously comparing the present estimate with the present compensating signal. If the difference between the present estimate and the present compensating signal lies outside of a predefined interval, then the comparator triggers the compensator to produce an updated compensating signal according to the present estimate, and to switch from the present compensating signal to the updated compensating signal, and the adder adds the updated compensating signal to the AC signal. If the difference lies within the predefined interval, then the compensator continues to produce the present compensating signal, and the adder adds the present compensating signal to the AC signal.
    Type: Application
    Filed: June 3, 2005
    Publication date: December 8, 2005
    Applicant: Infineon Technologies AG
    Inventor: Mikael Hjelm