Patents by Inventor Hongxin Song

Hongxin Song 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: 8160181
    Abstract: A non-linear detector for detecting signals with signal-dependent noise is disclosed. The detector may choose a data sequence that maximizes the conditional probability of detecting the channel data. Since the channel may be time-varying and the precise channel characteristics may be unknown, the detector may adapt one or more branch metric parameters before sending the parameters to a loading block. In the loading block, the branch metric parameters may be normalized and part of the branch metric may be pre-computed to reduce the complexity of the detector. The loading block may then provide the branch metric parameters and any pre-computation to the detector. The detector may then calculate the branch metric associated with the input signal and output the channel data.
    Type: Grant
    Filed: July 25, 2006
    Date of Patent: April 17, 2012
    Assignee: Marvell International Ltd.
    Inventors: Hongxin Song, Seo-How Low, Panu Chaichanavong, Zining Wu
  • Patent number: 8161361
    Abstract: Systems and techniques to interpret signals on a noisy channel. In general, in one implementation, the technique includes: interpreting an input signal as discrete values, and in response to an inadequate signal, averaging multiple signals to improve interpretation of the input signal. The input signal can be a read signal from a storage medium, such as those found in disk drives. A read channel can include a buffer and an averaging circuit capable of different signal averaging approaches in a retry mode, including making signal averaging decisions based on a signal quality measure. Buffering read signals can be done in alternative locations in the read channel and can involve buffering of many prior read signals and/or buffering of an averaged read signal.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: April 17, 2012
    Assignee: Marvell International Ltd.
    Inventors: Hongxin Song, Zining Wu
  • Patent number: 8054717
    Abstract: A system and method are provided to detect defects in a data storage medium by sampling data read from the data storage medium. Time referenced samples of data read from the data storage medium are equalized to mediate the effects of channel noise and the equalized samples are decoded by a decoder, such as a Viterbi decoder. The decoded signal is then reconstructed through a reconstruction filter to approximate the equalized signal. The equalized data signal and the reconstructed data signal are then combined and compared in a bit-by-bit deconstruction scheme to determine, based on a variation between the signal elements, that a defect exists on the data storage medium. Additional action is then taken to mediate the effects of attempting to process corrupted data based on the defect by isolating the defective bit.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: November 8, 2011
    Assignee: Marvell International Ltd.
    Inventors: Shaohua Yang, Hongwei Song, Zining Wu, Xueshi Yang, Hongxin Song
  • Patent number: 7755522
    Abstract: Apparatuses, methods, and circuits for analog signal adjustment (or baseline loop cancellation) are disclosed. In one embodiment, an apparatus for adjusting an analog input signal includes a first mixer for combining the analog input signal and an adjustment signal; an analog signal conditioning circuit that receives an output from the first mixer and provides a conditioned analog signal; an analog-to-digital converter (ADC) that converts the conditioned analog signal to a first digital signal; a first logic block that provides a correction signal and the adjustment signal; and a second mixer that combines the first digital signal and the correction signal, and provides a digital output signal.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: July 13, 2010
    Assignee: Marvell International Ltd.
    Inventors: Hongxin Song, Zining Wu
  • Patent number: 7589649
    Abstract: Apparatuses, methods, and systems for compensating baseline offset in a read channel of an analog storage device. The apparatus generally includes an AC-coupling circuit configured to transfer an analog signal from an analog storage device to the read channel, a configurable current device coupled to the AC-coupling circuit, comparator coupled to the AC-coupling circuit, and logic coupled to the configurable current device and the comparator, wherein the logic is adapted to configure said current device in response to an output of at least one of the AC-coupling circuit and the comparator.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: September 15, 2009
    Assignee: Marvell International Ltd.
    Inventors: Arshan Aga, Chi Fung Cheng, Hongxin Song
  • Patent number: 7486215
    Abstract: Apparatuses, methods, and circuits for analog signal adjustment (or baseline loop cancellation) are disclosed. In one embodiment, an apparatus for adjusting an analog input signal includes a first mixer for combining the analog input signal and an adjustment signal; an analog signal conditioning circuit that receives an output from the first mixer and provides a conditioned analog signal; an analog-to-digital converter (ADC) that converts the conditioned analog signal to a first digital signal; a first logic block that provides a correction signal and the adjustment signal; and a second mixer that combines the first digital signal and the correction signal, and provides a digital output signal.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: February 3, 2009
    Assignee: Marvell International Ltd.
    Inventors: Hongxin Song, Zining Wu