Patents Assigned to Conexant Systems, Inc.
  • Patent number: 9654866
    Abstract: A system for controlling distortion comprising a total harmonic distortion (THD) modeling system configured to apply a chirp signal to a system and to identify one or more frequency bands at which distortion is present, and to apply a ramping signal to identify for each of the one or more frequency bands an input signal level at which distortion is initiated. A signal processing system configured to receive an input signal, to determine whether frequency components are present in the input signal that are associated with the one or more frequency bands at which distortion is present, and to limit the amplitude of the input signal at the one or more frequency bands, such as by applying dynamic range compensation.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: May 16, 2017
    Assignee: Conexant Systems, Inc.
    Inventors: Govind Kannan, Harry K. Lau, Trausti Thormundsson, Ragnar H. Jonsson
  • Patent number: 9600421
    Abstract: Encrypted storage often introduces unwanted latency in access. This delay can result in a processor having to wait for critical data thus slowing performance. Generally speaking, the latency is at most an issue when reading from encrypted storage, since the processor may need the information read from encrypted storage to proceed. During a write operation, there typically is not an issue because the processor does not need to wait for the end of the write operation to proceed. A variant of counter (CTR) mode for a block cipher can be used to perform the majority of the decryption operation without knowledge of the ciphertext, therefore the majority of the decryption operation can be performed concurrently with the retrieval of the ciphertext from memory. In order to further secure the encrypted storage, a light encryption can be performed to further obfuscate the ciphertext.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: March 21, 2017
    Assignee: Conexant Systems, Inc.
    Inventor: Mark E. Miller
  • Patent number: 9602927
    Abstract: A system for audio processing comprising a room reflection emulation system for emulating sound reflections in a room. A room acoustics emulation system for emulating acoustic properties of the room. A head, shoulder and ear emulation system for emulation sound reflections near the head.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: March 21, 2017
    Assignee: Conexant Systems, Inc.
    Inventor: Harry K. Lau
  • Patent number: 9564144
    Abstract: A system for processing audio data comprising a linear demixing system configured to receive a plurality of sub-band audio channels and to generate an audio output and a noise output. A spatial likelihood system coupled to the linear demixing system, the spatial likelihood system configured to receive the audio output and the noise output and to generate a spatial likelihood function. A sequential Gaussian mixture model system coupled to the spatial likelihood system, the sequential Gaussian mixture model system configured to generate a plurality of model parameters. A Bayesian probability estimator system configured to receive the plurality of model parameters and a speech/noise presence probability and to generate a noise power spectral density and spectral gains. A spectral filtering system configured to receive the spectral gains and to apply the spectral gains to noisy input mixtures.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: February 7, 2017
    Assignee: Conexant Systems, Inc.
    Inventors: Francesco Nesta, Trausti Thormundsson
  • Patent number: 9124219
    Abstract: An audio driver comprising a distortion detection unit coupled between an amplifier and a loudspeaker and configured to detect a distortion signal generated by the loudspeaker while the loudspeaker is being used to deliver an audio signal from the amplifier. A distortion compensation unit configured to compensate for the distortion signal without interfering with the audio signal.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: September 1, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Trausti Thormundsson, Ragnar H. Jonsson, Vilhjalmur S. Thorvaldsson, James Walter Wihardja
  • Patent number: 9029991
    Abstract: An example semiconductor package with reduced solder voiding is described, which has a leadframe having an I/O pad and a thermal pad, a fabricated semiconductor die having a bond pad, where the fabricated semiconductor die is attached to a top surface of the thermal pad, and a wire bond connecting the bond pad to the I/O pad, where a bottom surface of the thermal pad has channels.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: May 12, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Robert W. Warren, Hyun Jung Lee, Nic Rossi
  • Patent number: 9024603
    Abstract: A current comparator comprising a first NMOS transistor having a drain coupled to VDD, a source and a gate. A first PMOS transistor having a source coupled to the source of the first NMOS transistor to form an input, a drain coupled to VSS and a gate coupled to the gate of the first NMOS transistor. A second NMOS transistor having a drain coupled to VDD, a source and a gate coupled to the input. A first bias current source having an input coupled to the source of the second NMOS transistor and an output. A second bias current source having an input coupled to the drain of the first NMOS transistor and an output coupled to the gate of the first NMOS transistor. A third NMOS transistor having a drain coupled to the gate of the first NMOS transistor to form an output, a source and a gate.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: May 5, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Brian W. Friend, Kyehyung Lee
  • Patent number: 9025959
    Abstract: Consumer infrared (CIR) systems typically are used in remote control systems. Most CIR systems expect a known carrier frequency and encoding scheme. However, there are many applications of a universal CIR receiver which can receive and decode CIR signals regardless of the carrier frequency or encoding scheme. A CIR receiver circuit is disclosed which can both decompose a received CIR signal into run length representation and detect the carrier frequency. The result can then be supplied to a host device for further processing, interpretation and/or actions.
    Type: Grant
    Filed: July 2, 2012
    Date of Patent: May 5, 2015
    Assignee: Conexant Systems, Inc.
    Inventor: Michael A. Eskin
  • Patent number: 8995324
    Abstract: Stations in standby mode periodically wake up to check for buffered data at the access points. Traditionally, the information is available by checking the periodic beacon frame for a traffic indication map (TIM). Unfortunately, the length of beacons has steadily increased with the progression of the various wireless standards requiring stations to wake up for longer periods to merely check for buffered data. Several approaches are disclosed which address this shortcoming, including the broadcast of TIM frames, the partial reception of beacon frames and the use of an embedded TIM frame within a beacon frame.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: March 31, 2015
    Assignee: Conexant Systems, Inc.
    Inventor: Maarten Menzo Wentink
  • Patent number: 8997125
    Abstract: A system for printing comprising a plurality of local printer applications operating on a processor, each configured to render a single associated file type for printing. A print through server application operating on the processor and configured to transmit a print job to an external processor for rendering. A system manager operating on the processor and configured to transmit a file to one of the plurality of local printer applications if the file has a file type that is identical to the file type associated with one of the local printer applications, and to transmit the file to the print through server application if the file type of the file does not match any of the file types for the local printer applications.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: March 31, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Somasundaram Meiyappan, Carl Mikkelsen
  • Patent number: 8989212
    Abstract: Systems and methods for coexistence of WLAN and Bluetooth networks are described. At least one embodiment includes a method for operating a wireless device in both a 802.11 network and a Bluetooth network. In accordance with some embodiments, the method comprises monitoring transmission of Synchronous Connection Oriented (SCO) slots over the Bluetooth network, informing an access point (AP) in the 802.11 network not to transmit to the device before the end of an SCO slot, transmitting a power save trigger to the AP to retrieve buffered data from the AP, and transmitting data to the AP.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: March 24, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Menzo Wentink, Doug Berger, Trent Carter
  • Patent number: 8983092
    Abstract: Peak reduction and power limitations are used to prevent distortion and protect components. In a cellular telephone, peak reduction can be based on battery power level to prevent electrical distortion from saturation. In addition peak reduction can be used to prevent mechanical distortion such as rub and buzz. Dynamic range compression can be used for peak reduction. In another application dynamic range compression can be used to control the power output to protect a speaker from damage. One example of a dynamic range compressor/peak limiter comprises a look-ahead buffer and an analysis engine. For example, the look-ahead buffer holds a window of samples of a signal. The analysis engine selects a gain envelope function on the basis of the samples, for example, by selecting the Pth sample in the buffer whenever that sample exceeds a given threshold.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: March 17, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Trausti Thormundsson, Govind Kannan, Shlomi I. Regev, James W. Wihardja, Yair Kerner, Harry K. Lau, Ragnar H. Jonsson
  • Patent number: 8971542
    Abstract: A sound reproduction apparatus comprising a loudspeaker bar having a plurality of loudspeakers. A loudspeaker bar controller coupled to the loudspeaker bar for processing audio data for the plurality of loudspeakers, the loudspeaker bar controller comprising a spatial enhancement/virtualization system for receiving a surround channel of audio data and processing the surround channel of audio data with a spatial generation/virtualization filter, wherein a left stereo channel of audio data and a right stereo channel of audio data are not processed with the head related transfer function filter. Bass is enhanced for small speakers which are not able to produce bass frequencies.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: March 3, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Harry K. Lau, Yair Kerner, Jonathan Chien, James W. Wihardja
  • Patent number: 8965135
    Abstract: A system for cadence break detection is provided. The system includes a field system receiving a plurality of fields of image data. A threshold system generates a cadence break signal if a difference in two fields exceeds a predetermined threshold. A sequence system generates the cadence break signal if a sequence of differences between the plurality of fields does not match a predetermined sequence.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: February 24, 2015
    Assignee: Conexant Systems, Inc.
    Inventor: Carl Alelyunas
  • Patent number: 8892918
    Abstract: A system for power management. The system includes a plurality of input/output pads and a plurality of input/output cells, where each input/output cell is coupled to one of the input/output pads. The system further includes a plurality of interrupt observe circuits, where each interrupt observe circuit is coupled to one of the input/output cells, and where the interrupt observe circuits are configured to generate an interrupt flag during a low power mode.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: November 18, 2014
    Assignee: Conexant Systems, Inc.
    Inventors: Nathan J. Dohm, Michael J. Schaffstein
  • Patent number: 8872678
    Abstract: Poly-phase filters are used to offer an efficient and low complexity solution to rate conversion. However, they suffer from inflexibility and are not easily reconfigured. A novel design for rate converters employ poly-phase filters but utilize interpolation between filter coefficients to add flexibility to rate conversion. This interpolation can be implemented as an interpolation of the poly-phase filter results. Additional approximations can be made to further reduce the amount of calculations required to implement a flexible rate converter.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: October 28, 2014
    Assignee: Conexant Systems, Inc.
    Inventors: Ragnar H. Jonsson, Vilhjalmur S. Thorvaldsson, Trausti Thormundsson
  • Patent number: 8847896
    Abstract: A system for controlling a touch screen. A touch screen element having a plurality of contacts, such as one contact electrode at each of four corners. A multiplexer coupled to the touch screen element for forming a plurality of connections, such as various combinations of the contact electrodes to allow measurements to be made of the impedance of the touch screen element from the left side to the right side, from the top to the bottom, and do forth. A touch screen processor coupled to the touch screen element for determining an oscillation frequency of the touch screen element as a function of the electrode connections.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: September 30, 2014
    Assignee: Conexant Systems, Inc.
    Inventors: Mark E. Miller, George C. Sneed, Ramakrishna Y. Vadapalli, Sudhaker Anumula
  • Patent number: 8849315
    Abstract: Systems and methods for retrieving data from an access point within a wireless communications system are described. At least one embodiment includes a method for retrieving buffered data in a wireless communication system. In accordance with some embodiments, the method comprises transmitting a paging request to a plurality of access points while in a low power mode, receiving a Paging Indication element or a TIM Response element while remaining in low power mode, and exiting low power mode if buffered data is present and retrieving the buffered data. The Paging Indication element or TIM Response element indicates whether buffered data is present.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: September 30, 2014
    Assignee: Conexant Systems, Inc.
    Inventor: Menzo Wentink
  • Publication number: 20140249812
    Abstract: A system for audio processing comprising an initial background statistical model system configured to generate an initial background statistical model using a predetermined sample size of audio data. A parameter computation system configured to generate parametric data for the audio data including cepstral and energy parameters. A background statistics computation system configured to generate preliminary background statistics for determining whether speech has been detected. A first speech detection system configured to determine whether speech was present in the initial sample of audio data. An adaptive background statistical model system configured to provide an adaptive background statistical model for use in continuous processing of audio data for speech detection. A parameter computation system configured to calculate cepstral parameters, energy parameters and other suitable parameters for speech detection.
    Type: Application
    Filed: March 4, 2014
    Publication date: September 4, 2014
    Applicant: Conexant Systems, Inc.
    Inventors: Sahar E. Bou-Ghazale, Trausti Thormundsson, Willie B. Wu
  • Publication number: 20140247091
    Abstract: A circuit comprising a peak detector configured to receive a positive voltage input, a negative voltage input and a reference current source input and to output a peak signal data value. A fast attack current source control coupled to the peak detector and configured to generate a current source control signal as a function of the peak signal data value. A slow decay control coupled to the fast attack current source control and configured to reduce the current source control signal based on a predetermined or user-selected decay rate. A variable current source coupled to the fast attack current source control and configured to generate a variable current as a function of the current source control signal. Amplifier circuitry coupled to the variable current source, the amplifier circuitry configured to receive the variable current.
    Type: Application
    Filed: March 4, 2014
    Publication date: September 4, 2014
    Applicant: Conexant Systems, Inc.
    Inventors: Brian W. Friend, Lorenzo Crespi, Kyehyung Lee