Patents by Inventor Mark Fimoff

Mark Fimoff 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: 9237053
    Abstract: A DMT system for a half-duplex two-way link carries Internet protocol encoded video stream on a coaxial cable that also carries a baseband rendition of the same video stream. A plurality of downlink symbols modulated on a subband of subcarriers in a downlink signal are decoded. The symbols may carry data encoded on a subband using a constellation of QAM symbols assigned to the subband. Other subbands may be associated with different QAM constellations. Lower-order constellations of QAM symbols may be assigned to subbands that include higher-frequency subcarriers and higher-order constellations of QAM symbols may be assigned to subbands that include lower-frequency subcarriers. A block error correction decoder may be synchronized based on an identification of the first constellation of QAM symbols and information identifying boundaries between the plurality of downlink symbols.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: January 12, 2016
    Assignee: INTERSIL AMERICAS LLC
    Inventors: Mark Fimoff, Greg Tomezak
  • Patent number: 9160601
    Abstract: A novel framing method for a variable net bit rate digital communications system that utilizes a set of different QAM constellations and punctured trellis code combinations, each combination designated as a mode. This frame structure has a variable integral number of QAM symbols per frame depending on the selected mode, but the number of bytes and Reed-Solomon packets per frame is constant. This is achieved even though the number of data bits per QAM symbol for some modes is fractional. Also the number of trellis coder puncture pattern cycles per frame is an integer for all modes. This arrangement simplifies the synchronization of receiver processing blocks such as the Viterbi decoder, de-randomizer, byte de-interleaver, and Reed-Solomon decoder.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: October 13, 2015
    Assignee: INTERSIL AMERICAS LLC
    Inventors: Mark Fimoff, Jinghua Jin, Jin H. Kim
  • Publication number: 20150156051
    Abstract: A DMT system for a half-duplex two-way link carries Internet protocol encoded video stream on a coaxial cable that also carries a baseband rendition of the same video stream. A plurality of downlink symbols modulated on a subband of subcarriers in a downlink signal are decoded. The symbols may carry data encoded on a subband using a constellation of QAM symbols assigned to the subband. Other subbands may be associated with different QAM constellations. Lower-order constellations of QAM symbols may be assigned to subbands that include higher-frequency subcarriers and higher-order constellations of QAM symbols may be assigned to subbands that include lower-frequency subcarriers. A block error correction decoder may be synchronized based on an identification of the first constellation of QAM symbols and information identifying boundaries between the plurality of downlink symbols.
    Type: Application
    Filed: November 28, 2014
    Publication date: June 4, 2015
    Inventors: Mark FIMOFF, Greg TOMEZAK
  • Patent number: 9001911
    Abstract: A DMT system for a half-duplex two-way link carries Internet protocol encoded video stream on a coaxial cable that also carries a baseband rendition of the same video stream. A plurality of downlink symbols modulated on a subband of subcarriers in a downlink signal are decoded. The symbols may carry data encoded on a subband using a constellation of QAM symbols assigned to the subband. Other subbands may be associated with different QAM constellations. Lower-order constellations of QAM symbols may be assigned to subbands that include higher-frequency subcarriers and higher-order constellations of QAM symbols may be assigned to subbands that include lower-frequency subcarriers. A block error correction decoder may be synchronized based on an identification of the first constellation of QAM symbols and information identifying boundaries between the plurality of downlink symbols.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: April 7, 2015
    Assignee: Intersil Americas LLC
    Inventors: Mark Fimoff, Greg Tomezak
  • Publication number: 20150003546
    Abstract: A novel framing method for a variable net bit rate digital communications system that utilizes a set of different QAM constellations and punctured trellis code combinations, each combination designated as a mode. This frame structure has a variable integral number of QAM symbols per frame depending on the selected mode, but the number of bytes and Reed-Solomon packets per frame is constant. This is achieved even though the number of data bits per QAM symbol for some modes is fractional. Also the number of trellis coder puncture pattern cycles per frame is an integer for all modes. This arrangement simplifies the synchronization of receiver processing blocks such as the Viterbi decoder, de-randomizer, byte de-interleaver, and Reed-Solomon decoder.
    Type: Application
    Filed: June 30, 2014
    Publication date: January 1, 2015
    Inventors: Mark Fimoff, Jinghua Jin, Jin H. Kim
  • Patent number: 8767856
    Abstract: A novel framing method for a variable net bit rate digital communications system that utilizes a set of different QAM constellations and punctured trellis code combinations, each combination designated as a mode. This frame structure has a variable integral number of QAM symbols per frame depending on the selected mode, but the number of bytes and Reed-Solomon packets per frame is constant. This is achieved even though the number of data bits per QAM symbol for some modes is fractional. Also the number of trellis coder puncture pattern cycles per frame is an integer for all modes. This arrangement simplifies the synchronization of receiver processing blocks such as the Viterbi decoder, de-randomizer, byte de-interleaver, and Reed-Solomon decoder.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: July 1, 2014
    Assignee: Intersil Americas LLC
    Inventors: Mark Fimoff, Jinghua Jin, Jin H. Kim
  • Patent number: 8640001
    Abstract: Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data and reordered ATSC data. The normally ordered robust VSB data and reordered ATSC data are time multiplexed for transmission to a receiver. The receiver discards the reordered ATSC data or the normally ordered robust VSB data depending upon receiver type or user selection. A robust VSB receiver is able to process the normally ordered robust VSB data upstream of an outer decoder without an interleave thereby avoiding the delay associated with an interleave.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: January 28, 2014
    Assignee: Zenith Electronics LLC
    Inventors: Wayne E. Bretl, Richard W. Citta, Mark Fimoff
  • Patent number: 8576898
    Abstract: Systems and methods for controlling transmission of signals are described. A camera-side modem is configured to receive two signals from a video camera and to extract a received passband signal from a transmission line. A detector in the camera-side modem generates an enable signal when the received passband signal is identified. The enable signal is used to control transmission of at least one of the baseband video signal and the passband video signal. The passband signal may be identified by an estimate of mean square error in a quadrature amplitude demodulator, a measurement of reliability provided by a constellation detector, a measurement of reliability based on a sequence of frame synchronizations and/or an estimate of mean square error in an equalizer. The detector may monitor a gain factor in an automatic gain control module of the camera-side modem and/or a magnitude of the received passband signal.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: November 5, 2013
    Assignee: Techwell, Inc.
    Inventors: Khanh Lam, Mark Fimoff, Greg Tomezak, Dennis Mutzabaugh
  • Patent number: 8576966
    Abstract: Systems and methods for controlling transmission of signals are described. A camera-side modem is configured to receive two signals from a video camera and to extract a received passband signal from a transmission line. A detector in the camera-side modem generates an alarm signal when disruption or loss of the received passband signal is identified. An enable signal is used to control transmission of at least one of the baseband video signal and the passband video signal. The passband signal may be identified by an estimate of mean square error in a quadrature amplitude demodulator, a measurement of reliability provided by a constellation detector, a measurement of reliability based on a sequence of frame synchronizations and/or an estimate of mean square error in an equalizer. The detector may monitor a gain factor in an automatic gain control module of the camera-side modern and/or a magnitude of the received passband signal.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: November 5, 2013
    Assignee: Techwell, Inc.
    Inventors: Mark Fimoff, Khanh Lam, Dennis Mutzabaugh, David Ritter, Greg Tomezak
  • Publication number: 20130287142
    Abstract: A novel framing method for a variable net bit rate digital communications system that utilizes a set of different QAM constellations and punctured trellis code combinations, each combination designated as a mode. This frame structure has a variable integral number of QAM symbols per frame depending on the selected mode, but the number of bytes and Reed-Solomon packets per frame is constant. This is achieved even though the number of data bits per QAM symbol for some modes is fractional. Also the number of trellis coder puncture pattern cycles per frame is an integer for all modes. This arrangement simplifies the synchronization of receiver processing blocks such as the Viterbi decoder, de-randomizer, byte de-interleaver, and Reed-Solomon decoder.
    Type: Application
    Filed: June 27, 2013
    Publication date: October 31, 2013
    Inventors: Mark Fimoff, Jinghua Jin, Jin H. Kim
  • Patent number: 8428188
    Abstract: Systems and methods are described that may be used to detect and correct carrier phase offset in a signal. A phase offset corrector receives an equalized signal representative of a quadrature amplitude modulated signal and derives a phase-corrected signal from the equalized signal. The equalized signal is sliced to obtain real and imaginary sequences and a frame synchronizer performs a correlation of the real and imaginary sequences with corresponding parts of a stored frame-sync pseudo-random sequence. Phase correction is based on the maximum real and imaginary values of the correlation. The signal is typically quadrature amplitude modulated signal is modulated using punctured trellis codes. Quadrature phase shift keying modulation, 16-QAM, 64-QAM and other QAM schemes may be used.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: April 23, 2013
    Assignee: Techwell, Inc.
    Inventors: Mark Fimoff, Jinghua Jin, Greg Tomezak
  • Patent number: 8385397
    Abstract: A method and system for determining a step size of an adaptive equalizer for a digital data receiver. The data received by the receiver includes coded symbols and uncoded symbols. The method includes determining a first error estimate based on decoded symbols corresponding to the coded symbols, determining a second error estimate based on the uncoded symbols, adaptively selecting the first error estimate or the second error estimate based on a convergence criterion, and determining a step size based on the selected error estimate.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: February 26, 2013
    Assignee: Techwell LLC
    Inventors: Mark Fimoff, Jin Kim, Gregory J. Tomezak
  • Patent number: 8374270
    Abstract: Systems and methods for determining an unknown QPSK or QAM constellation from a set of possible received constellations are described. One method utilizes a histogram of the power of the signal after inter-symbol-interference has been minimized with a modified constant modulus algorithm equalizer. The constellation may be determined before carrier frequency and phase has been fully recovered. An unknown QPSK or QAM constellation may be identified before or after equalization using disclosed methods for analyzing an output power histogram.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: February 12, 2013
    Assignee: Intersil Americas Inc.
    Inventors: Greg Tomezak, Mark Fimoff
  • Patent number: 8369435
    Abstract: A novel framing method for a variable net bit rate digital communications system that utilizes a set of different QAM constellations and punctured trellis code combinations, each combination designated as a mode. This frame structure has a variable integral number of QAM symbols per frame depending on the selected mode, but the number of bytes and Reed-Solomon packets per frame is constant. This is achieved even though the number of data bits per QAM symbol for some modes is fractional. Also the number of trellis coder puncture pattern cycles per frame is an integer for all modes. This arrangement simplifies the synchronization of receiver processing blocks such as the Viterbi decoder, de-randomizer, byte de-interleaver, and Reed-Solomon decoder.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: February 5, 2013
    Assignee: Intersil Americas Inc.
    Inventors: Mark Fimoff, Jinghua Jin, Jin H. Kim
  • Patent number: 8320442
    Abstract: A decision feedback equalizer is operated by making first symbol decisions from an output of the decision feedback equalizer such that the first symbol decisions are characterized by a relatively long processing delay, by making second symbol decisions from the output of the decision feedback equalizer such that the second symbol decisions are characterized by a relatively short processing delay, and by determining tap weights for the decision feedback equalizer based on the first and second symbol decisions. The first symbol decisions may be derived from the output of a long traceback trellis decoder. The second symbol decisions may be derived either from the output of a short traceback trellis decoder or from shorter delay outputs of the long traceback trellis decoder.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: November 27, 2012
    Assignee: Zenith Electronics LLC
    Inventors: Bruno Amizic, Mark Fimoff, Jin Kim, Sreenivasa M. Nerayanuru
  • Patent number: 8238381
    Abstract: Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data and reordered ATSC data. The normally ordered robust VSB data and reordered ATSC data are time multiplexed for transmission to a receiver. The receiver discards the reordered ATSC data or the normally ordered robust VSB data depending upon receiver type or user selection. A robust VSB receiver is able to process the normally ordered robust VSB data upstream of an outer decoder without an interleave thereby avoiding the delay associated with an interleave.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: August 7, 2012
    Assignee: Zenith Electronics LLC
    Inventors: Wayne E. Bretl, Richard W. Citta, Mark Fimoff
  • Patent number: 8213464
    Abstract: Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data and reordered ATSC data. The normally ordered robust VSB data and reordered ATSC data are time multiplexed for transmission to a receiver. The receiver discards the reordered ATSC data or the normally ordered robust VSB data depending upon receiver type or user selection. A robust VSB receiver is able to process the normally ordered robust VSB data upstream of an outer decoder without an interleave thereby avoiding the delay associated with an interleave.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: July 3, 2012
    Assignee: Zenitch Electronics LLC
    Inventors: Wayne E. Bretl, Richard W. Citta, Mark Fimoff
  • Patent number: 8213465
    Abstract: Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data and reordered ATSC data. The normally ordered robust VSB data and reordered ATSC data are time multiplexed for transmission to a receiver. The receiver discards the reordered ATSC data or the normally ordered robust VSB data depending upon receiver type or user selection. A robust VSB receiver is able to process the normally ordered robust VSB data upstream of an outer decoder without an interleave thereby avoiding the delay associated with an interleave.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: July 3, 2012
    Assignee: Zenith Electronics LLC
    Inventors: Wayne E. Bretl, Richard W. Citta, Mark Fimoff
  • Patent number: 8213466
    Abstract: Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data and reordered ATSC data. The normally ordered robust VSB data and reordered ATSC data are time multiplexed for transmission to a receiver. The receiver discards the reordered ATSC data or the normally ordered robust VSB data depending upon receiver type or user selection. A robust VSB receiver is able to process the normally ordered robust VSB data upstream of an outer decoder without an interleave thereby avoiding the delay associated with an interleave.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: July 3, 2012
    Assignee: Zenith Electronics LLC
    Inventors: Wayne E. Bretl, Richard W. Citta, Mark Fimoff
  • Patent number: 8184666
    Abstract: Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data. The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data and reordered ATSC data. The normally ordered robust VSB data and reordered ATSC data are time multiplexed for transmission to a receiver. The receiver discards the reordered ATSC data or the normally ordered robust VSB data depending upon receiver type or user selection. A robust VSB receiver is able to process the normally ordered robust VSB data upstream of an outer decoder without an interleave thereby avoiding the delay associated with an interleave.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: May 22, 2012
    Assignee: Zenith Electronics LLC
    Inventors: Wayne E. Bretl, Richard W. Citta, Mark Fimoff