Patents by Inventor Zachary Keirn
Zachary Keirn 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).
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Patent number: 8995242Abstract: A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components depending on which detection area detects the component, measuring a value of a signal characteristic, such as signal-to-noise ratio, of two signals with different sets of weighting factors, and determining an adjustment factor to the radial tilt as a function of the of the measured signal characteristic values.Type: GrantFiled: September 18, 2013Date of Patent: March 31, 2015Assignee: Marvell International Ltd.Inventors: Mats Oberg, Zachary Keirn, Christopher Painter
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Patent number: 8957793Abstract: Aspects of the disclosure provide a method. The method includes boosting a portion of frequency components of a digital signal that is converted from an analog signal based on a clock signal, generating a decision signal based on the boosted digital signal, generating a timing error signal based on the boosted digital signal and the decision signal, and filtering the timing error signal to generate a voltage signal to control a voltage controlled oscillator to generate the clock signal.Type: GrantFiled: September 10, 2012Date of Patent: February 17, 2015Assignee: Marvell International Ltd.Inventors: Jingfeng Liu, Mats Oberg, Zachary Keirn, Bin Ni
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Patent number: 8830808Abstract: Aspects of the disclosure provide a signal processing circuit. The signal processing circuit includes a processing path and a zero-start module. The processing path is configured to process an electrical signal that is generated in response to reading data on a storage medium. The data includes at least a first field and a second field. The electrical signal has a first profile corresponding to the first field and has a second profile corresponding to the second field. The zero-start module is configured to detect a field change from the first field to the second field, and control the processing path to add a compensation as a function of a profile change from the first profile to the second profile to keep the processed electrical signal to have a predetermined profile in response to the detected field change.Type: GrantFiled: August 16, 2010Date of Patent: September 9, 2014Assignee: Marvell International Ltd.Inventors: Bin Ni, Zachary Keirn, Mats Oberg
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Patent number: 8755260Abstract: Aspects of the disclosure provide an apparatus. The apparatus includes a collimator configured to have a plurality of positions, and a controller configured to control the collimator to move to a predetermined position associated with a data layer of an optical storage medium to collimate a light beam. The collimated light beam is then focused onto the data layer of the optical storage medium.Type: GrantFiled: June 13, 2012Date of Patent: June 17, 2014Assignee: Marvell World Trade Ltd.Inventors: Mats Oberg, Zachary Keirn
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Patent number: 8553510Abstract: A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components depending on which detection area detects the component, measuring a value of a signal characteristic, such as signal-to-noise ratio, of two signals with different sets of weighting factors, and determining an adjustment factor to the radial tilt as a function of the of the measured signal characteristic values.Type: GrantFiled: August 9, 2012Date of Patent: October 8, 2013Assignee: Marvell International Ltd.Inventors: Mats Oberg, Zachary Keirn, Christopher Painter
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Patent number: 8385165Abstract: Aspects of the disclosure provide a method for efficiently calibrating an optical recording device. The method can include receiving a first signal corresponding to a wobbled track of a memory medium, phase-locking a second signal to the first signal, the second signal being used to extract embedded information in the wobbled track, and determining an optimum setting of the optical recording device based on a locking quality of the first signal and the second signal.Type: GrantFiled: January 26, 2012Date of Patent: February 26, 2013Assignee: Marvell International Ltd.Inventors: Jingfeng Liu, Zachary Keirn
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Publication number: 20130021890Abstract: Aspects of the disclosure provide an apparatus. The apparatus includes a collimator configured to have a plurality of positions, and a controller configured to control the collimator to move to a predetermined position associated with a data layer of an optical storage medium to collimate a light beam. The collimated light beam is then focused onto the data layer of the optical storage medium.Type: ApplicationFiled: June 13, 2012Publication date: January 24, 2013Inventors: Mats OBERG, Zachary Keirn
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Patent number: 8274413Abstract: A timing loop for generating a channel clock signal for driving an analog to digital converter (ADC) includes a slicer bias loop configured to generate an asymmetry compensation signal for a digital output signal from the ADC, the first adder configured to asymmetrically compensate the digital output signal based on the asymmetry compensation signal from the slicer bias loop, a limit equalizer configured to limit a boost range of the asymmetrically compensated digital output signal from the adder, a slicer configured to generate a temporary decision signal based on the asymmetrically compensated digital output signal from the limit equalizer, a phase detector configured to generate a timing error signal based on the asymmetrically compensated digital output signal from the limit equalizer and the temporary decision signal from the slicer; and the first filter configured to generate a clock signal for driving the ADC based on the time error signal from the phase detector.Type: GrantFiled: September 8, 2010Date of Patent: September 25, 2012Assignee: Marvell International Ltd.Inventors: Jingfeng Liu, Mats Oberg, Zachary Keirn, Bin Ni
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Patent number: 8243569Abstract: A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components depending on which detection area detects the component, measuring a value of a signal characteristic, such as signal-to-noise ratio, of two signals with different sets of weighting factors, and determining an adjustment factor to the radial tilt as a function of the of the measured signal characteristic values.Type: GrantFiled: March 22, 2011Date of Patent: August 14, 2012Assignee: Marvell International Ltd.Inventors: Mats Oberg, Zachary Keirn, Christopher Painter
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Patent number: 8107328Abstract: Aspects of the disclosure provide a method for efficiently calibrating an optical recording device. The method can include receiving a first signal corresponding to a wobbled track of a memory medium, phase-locking a second signal to the first signal, the second signal being used to extract embedded information in the wobbled track, and determining an optimum setting of the optical recording device based on a locking quality of the first signal and the second signal.Type: GrantFiled: October 17, 2008Date of Patent: January 31, 2012Assignee: Marvell International Ltd.Inventors: Jingfeng Liu, Zachary Keirn
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Patent number: 8046669Abstract: Methods and apparatus are provided for measuring the performance of a read channel. A number of detection techniques, such as SOVA and maximum-a-posteriori (MAP) detectors, produce a bit decision and a corresponding reliability value associated with the bit decision. The reliability value associated with the bit decision may be expressed, for example, in the form of log likelihood ratios (LLRs). The reliability value can be monitored and used as a performance measure. The present invention provides a channel performance measure that generally correlates directly to the BER but can be collected in less time.Type: GrantFiled: January 14, 2011Date of Patent: October 25, 2011Assignee: Agere Systems Inc.Inventors: Nils Graef, Zachary Keirn
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Patent number: 7969848Abstract: A media defect compensation system and method may decouple effects of asymmetry from baseline error compensation computations. In some embodiments, a switching mechanism passes a baseline error signal into a baseline loop when a determination is made that a baseline error signal is not affected by asymmetry, and otherwise freezes the baseline loop when asymmetry may influence baseline error calculations.Type: GrantFiled: January 22, 2008Date of Patent: June 28, 2011Assignee: Marvell International Ltd.Inventors: Jin Xie, Mats Oberg, Jingfeng Liu, Zachary Keirn
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Patent number: 7965597Abstract: Aspects of the disclosure provide a method for recording. The method includes receiving a tracking signal corresponding to a recording track on a storage medium, phase-locking an internal signal to the tracking signal by reducing a phase error generated based on the internal signal and the tracking signal, generating a phase bias, combining the phase bias into the phase error to phase-shift the internal signal from the tracking signal, and recording on the recording track based on the internal signal.Type: GrantFiled: July 8, 2010Date of Patent: June 21, 2011Assignee: Marvell International, Ltd.Inventors: Mats Oberg, Zachary Keirn
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Patent number: 7961124Abstract: A device and process to compensate for asymmetrical qualities of an analog input signal, if present, and generate a timing signal. The timing signal is then used for analog to digital conversion.Type: GrantFiled: April 3, 2009Date of Patent: June 14, 2011Assignee: Marvell International Ltd.Inventors: Jingfeng Liu, Mats Oberg, Zachary Keirn, Bin Ni
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Publication number: 20110119566Abstract: Methods and apparatus are provided for measuring the performance of a read channel. A number of detection techniques, such as SOVA and maximum-a-posteriori (MAP) detectors, produce a bit decision and a corresponding reliability value associated with the bit decision. The reliability value associated with the bit decision may be expressed, for example, in the form of log likelihood ratios (LLRs). The reliability value can be monitored and used as a performance measure. The present invention provides a channel performance measure that generally correlates directly to the BER but can be collected in less time.Type: ApplicationFiled: January 14, 2011Publication date: May 19, 2011Applicant: AGERE SYSTEMS INC.Inventors: Nils Graef, Zachary Keirn
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Patent number: 7941732Abstract: Methods and apparatus are provided for measuring the performance of a read channel. A number of detection techniques, such as SOVA and maximum-a-posteriori (MAP) detectors, produce a bit decision and a corresponding reliability value associated with the bit decision. The reliability value associated with the bit decision may be expressed, for example, in the form of log likelihood ratios (LLRs). The reliability value can be monitored and used as a performance measure. The present invention provides a channel performance measure that generally correlates directly to the BER but can be collected in less time.Type: GrantFiled: March 30, 2010Date of Patent: May 10, 2011Assignee: Agere Systems Inc.Inventors: Nils Graef, Zachary Keirn
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Patent number: 7933181Abstract: A system and method for adjusting the radial tilt, tangential tilt, or a combination of radial and tangential tilt of an optical detection unit in an optical disc reading system can include applying different weighting factors to different signal components depending on which detection area detects the component, measuring a value of a signal characteristic, such as signal-to-noise ratio, of two signals with different sets of weighting factors, and determining an adjustment factor to the radial tilt as a function of the of the measured signal characteristic values.Type: GrantFiled: April 28, 2008Date of Patent: April 26, 2011Assignee: Marvell International Ltd.Inventors: Mats Oberg, Zachary Keirn, Christopher Painter
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Patent number: 7825836Abstract: A timing loop for generating a channel clock signal for driving an analog to digital converter (ADC) includes a slicer bias loop configured to generate an asymmetry compensation signal for a digital output signal from the ADC, the first adder configured to asymmetrically compensate the digital output signal based on the asymmetry compensation signal from the slicer bias loop, a limit equalizer configured to limit a boost range of the asymmetrically compensated digital output signal from the adder, a slicer configured to generate a temporary decision signal based on the asymmetrically compensated digital output signal from the limit equalizer, a phase detector configured to generate a timing error signal based on the asymmetrically compensated digital output signal from the limit equalizer and the temporary decision signal from the slicer; and the first filter configured to generate a clock signal for driving the ADC based on the time error signal from the phase detector.Type: GrantFiled: January 24, 2008Date of Patent: November 2, 2010Assignee: Marvell International, LtdInventors: Jingfeng Liu, Mats Oberg, Zachary Keirn, Bin Ni
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Patent number: 7817512Abstract: The present disclosure can provide a method and an apparatus to correct wobble phase slip in an optical disc recording system during recording. The method of correcting a phase slip can include receiving a wobble signal of a first frequency, sampling the wobble signal to generate a sampled wobble signal, where the wobble signal is sampled at a second frequency that corresponds to a frequency of a sampling signal, comparing a phase of the sampled wobble signal with a phase of a controlled signal to generate a phase error, modifying the phase error by adding a phase bias, and adjusting the second frequency based on the modified phase error to reduce a magnitude of the modified phase error.Type: GrantFiled: October 26, 2007Date of Patent: October 19, 2010Assignee: Marvell International, Ltd.Inventors: Mats Oberg, Zachary Keirn
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Publication number: 20100185924Abstract: Methods and apparatus are provided for measuring the performance of a read channel. A number of detection techniques, such as SOVA and maximum-a-posteriori (MAP) detectors, produce a bit decision and a corresponding reliability value associated with the bit decision. The reliability value associated with the bit decision may be expressed, for example, in the form of log likelihood ratios (LLRs). The reliability value can be monitored and used as a performance measure. The present invention provides a channel performance measure that generally correlates directly to the BER but can be collected in less time.Type: ApplicationFiled: March 30, 2010Publication date: July 22, 2010Applicant: Agere Systems Inc.Inventors: Nils Graef, Zachary Keirn