Patents Assigned to Quellan, Inc.
  • Patent number: 8605566
    Abstract: A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: December 10, 2013
    Assignee: Quellan, Inc.
    Inventors: Bruce C. Schmukler, Arvind Raghavan, Ziba Nami, Jyothi Emmanuel Peddi, Andrew Joo Kim, Michael G. Vrazel, Charles E. Summers
  • Patent number: 8594258
    Abstract: Processing a signal comprising signal distortions with filters. The filters comprise a first filter configured to a first time scale to compensate for signal distortions within respective symbols of the signal and a second filter configured to a second time scale to compensate for signal distortions among symbols of the signal. A probability estimate is produced based on an output of at least one of the first and second filters. At least one of the first and second time scales is adjusted according to the probability estimate.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: November 26, 2013
    Assignee: Quellan, Inc.
    Inventors: Andrew Joo Kim, Vincent Mark Hietala, Sanjay Bajekal
  • Patent number: 8576939
    Abstract: A slicer can receive a communication signal having a level or amplitude that is between two discrete levels of a multilevel digital communication scheme. The slicer can compare the communication signal to a plurality of references such that multiple comparisons proceed essentially in parallel. A summation node can add the results of the comparisons to provide an output signal set to one of the discrete levels. The slicer can process the communication signal and provide the output signal on a symbol-by-symbol basis. A decision feedback equalizer (“DFE”) can comprise the slicer. A feedback circuit of the DFE can delay and scale the output signal and apply the delayed and scaled signal to the communication signal to reduce intersymbol interference (“ISI”).
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: November 5, 2013
    Assignee: Quellan, Inc.
    Inventors: Andrew Joo Kim, Cattalen Pelard, Edward Gebara
  • Patent number: 8503940
    Abstract: A method for interference suppression, including receiving a sample of an aggressor communication signal from a sensor embedded in a flex circuit, emulating interference that the aggressor communication signal imposes on a victim communication signal, and suppressing the imposed interference in response to applying the emulated interference to the victim communication signal. In other aspects, the flex circuit comprises a plurality of traces running substantially parallel to one another along a surface of the flex circuit, and the sensor comprises one of the plurality of traces and one of a plurality of traces of another flex circuit. In still other aspects, the flex circuit comprises a plurality of traces running substantially parallel to one another and the sensor comprises a trace of the flex circuit running perpendicular to the plurality of traces running substantially parallel to one another.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: August 6, 2013
    Assignee: Quellan, Inc.
    Inventors: Edward Gebara, Andrew Joo Kim, Joy Laskar, Anthony Stelliga, Emmanouil M. Tentzeris
  • Publication number: 20130099855
    Abstract: A signal filter and accompanying methods. In one embodiment, the filter includes a first mechanism for receiving a first signal. A second mechanism employs one or more modified representations of the first signal to cancel one or more frequency components of the first signal, yielding an output signal in response thereto. In a more specific embodiment, the first mechanism includes a splitter for receiving the first signal and splitting the first signal onto a first path and a second path. The second mechanism further includes one or more delay modules and one or more phase shifters in the first path and/or the second path. One or more controllable amplifiers are optionally included in the first path and/or the second path. The one or more delay modules, phase shifters, or amplifiers are responsive to one or more control signals from a controller. The controller is adapted to modify behavior of the second mechanism so that the filter is characterized by a desired frequency response.
    Type: Application
    Filed: December 17, 2012
    Publication date: April 25, 2013
    Applicant: Quellan, Inc.
    Inventors: Wilhelm Steffen Hahn, Wei Chen
  • Patent number: 8429439
    Abstract: A skew adjustor that can reduce inter-pair skew between differential signals received via a cable is disclosed. In one embodiment, a skew adjustor includes: a skew detector that receives signals from a cable, and provides a detected skew amount when skew is detected between two of the signals; an offset controller for receiving the detected skew amount, and for providing a delay control signal in response thereto; and a skew delay circuit that receives the signals and the delay control signal, and enables one or more delay stages in a path of a first arriving of the two skewed signals based on the delay control signal, such that an adjusted skew between the two skewed signals at an output of the skew delay circuit is less than the detected skew amount by an amount corresponding to the enabled one or more delay stages.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: April 23, 2013
    Assignee: Quellan, Inc.
    Inventors: Georgios Asmanis, Faouzi Chaahoub
  • Patent number: 8422412
    Abstract: A signal selector enhancer suitable for portable electronic devices and base stations is disclosed. In one embodiment, the enhancer can include: a filter for receiving a signal from a first node, and for providing a filtered signal output therefrom, where the first node is coupled to a signal selector; and a noise canceller for receiving the filtered signal output, and for providing an adjusted filtered signal at a second node, where the second node is coupled to the signal selector, and where an operation of the signal selector is enhanced by the filter and the noise canceller arrangement.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: April 16, 2013
    Assignee: Quellan, Inc.
    Inventor: Wilhelm Steffen Hahn
  • Publication number: 20130064382
    Abstract: A noise-reduction system includes a noise-pattern predictor in communication with a noise-canceling module. In a more specific embodiment, the noise-reduction apparatus further includes an input collector in communication with the noise-pattern predictor. The input collector is coupled to a first module, such as a sensor, that provides information to the noise-pattern predictor to facilitate predicting noise in an accompanying signal environment and to provide a first signal in response thereto. In an illustrative embodiment, the first signal includes information indicating when an ignition system of a vehicle will turn on. The first signal further includes information indicating when a second signal transmitted from a cellular base station will affect noise in the signal environment. The second signal may include a burst in a cellular signal.
    Type: Application
    Filed: November 9, 2012
    Publication date: March 14, 2013
    Applicant: QUELLAN, INC.
    Inventor: QUELLAN, INC.
  • Publication number: 20130064335
    Abstract: Processing a signal comprising signal distortions with filters. The filters comprise a first filter configured to a first time scale to compensate for signal distortions within respective symbols of the signal and a second filter configured to a second time scale to compensate for signal distortions among symbols of the signal. A probability estimate is produced based on an output of at least one of the first and second filters. At least one of the first and second time scales is adjusted according to the probability estimate.
    Type: Application
    Filed: November 9, 2012
    Publication date: March 14, 2013
    Applicant: QUELLAN, INC.
    Inventor: Quellan, Inc.
  • Patent number: 8380771
    Abstract: A signal filter and accompanying methods. In one embodiment, the filter includes a first mechanism for receiving a first signal. A second mechanism employs one or more modified representations of the first signal to cancel one or more frequency components of the first signal, yielding an output signal in response thereto. In a more specific embodiment, the first mechanism includes a splitter for receiving the first signal and splitting the first signal onto a first path and a second path. The second mechanism further includes one or more delay modules and one or more phase shifters in the first path and/or the second path. One or more controllable amplifiers are optionally included in the first path and/or the second path. The one or more delay modules, phase shifters, or amplifiers are responsive to one or more control signals from a controller. The controller is adapted to modify behavior of the second mechanism so that the filter is characterized by a desired frequency response.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: February 19, 2013
    Assignee: Quellan, Inc.
    Inventors: Wilhelm Steffen Hahn, Wei Chen
  • Patent number: 8315583
    Abstract: A noise-reduction system includes a noise-pattern predictor in communication with a noise-canceling module. In a more specific embodiment, the noise-reduction apparatus further includes an input collector in communication with the noise-pattern predictor. The input collector is coupled to a first module, such as a sensor, that provides information to the noise-pattern predictor to facilitate predicting noise in an accompanying signal environment and to provide a first signal in response thereto. In an illustrative embodiment, the first signal includes information indicating when an ignition system of a vehicle will turn on. The first signal further includes information indicating when a second signal transmitted from a cellular base station will affect noise in the signal environment. The second signal may include a burst in a cellular signal.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: November 20, 2012
    Assignee: Quellan, Inc.
    Inventors: David Anthony Stelliga, Wilhelm Steffen Hahn
  • Patent number: 8311168
    Abstract: A Signal Conditioning Filter (SCF) and a Signal Integrity Unit (SIU) address the coupled problem of equalization and noise filtering in order to improve signal fidelity for decoding. Specifically, a received signal can be filtered in a manner to optimize the signal fidelity even in the presence of both significant (large magnitudes of) ISI and noise. The present invention can provide an adaptive method that continuously monitors a signal fidelity measure. Monitoring the fidelity of a multilevel signal can be performed by external means such as by the SIU. A received signal y(t) can be “conditioned” by application of a filter with an electronically adjustable impulse response g(t). A resulting output z(t) can then be interrogated to characterize the quality of the conditioned signal. This fidelity measure q(t) can be used to adjust the filter response to maximize the fidelity measure of the conditioned signal.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: November 13, 2012
    Assignee: Quellan, Inc.
    Inventors: Andrew Joo Kim, Vincent Mark Hietala, Sanjay Bajekal
  • Patent number: 8219893
    Abstract: A method and system using the principle of generalized maximum likelihood estimation to resolve sample timing uncertainties that are associated with the decoding of communication signals. By using generalized maximum likelihood estimation, sample timing uncertainty can be resolved by taking multiple samples of the received signal within a symbol period and determining which sample best corresponds to the optimal sample timing. The sample which best corresponds to the optimal sample timing can be determined from a timing index which can be calculated from ambiguity indicators that are based on the samples of the received signal.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: July 10, 2012
    Assignee: Quellan, Inc.
    Inventors: Andrew Joo Kim, Stephen E. Ralph, Sanjay Bajekal
  • Patent number: 8183711
    Abstract: A power extractor suitable for locations proximate to the sink of a signal channel is disclosed. The power extractor can generate power from the signal channel without substantially disturbing a quality of signals within the channel. In one embodiment, the power extraction circuit can include: a current source coupled to a sink side of a signal channel, where the signal channel is independent of any power supply signal, the current source being high impedance to maintain signal quality within the signal channel; a first regulator configured to generate a first regulated supply from a current derived from the signal channel using the current source; and a second regulator coupled to the first regulator, where the second regulator is configured to generate a second regulated supply from the first regulated supply.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: May 22, 2012
    Assignee: Quellan, Inc.
    Inventors: Georgios Asmanis, Faouzi Chaahoub
  • Patent number: 8135350
    Abstract: A system for suppressing interference imposed on a victim communication signal by an aggressor communication signal including a circuit that comprises an input port, an output port, and a signal processing circuit connected between the input port and the output port, the signal processing circuit being operative to produce an interference compensation signal at the output port, for application to the victim communication signal, via processing a sample of the aggressor communication signal transmitted through the input port, and the input port being configured to connect to a sampling system that includes a first circuit trace running along a surface of a flex circuit of a portable wireless device that is dedicated to sensing the aggressor communication signal flowing on a second circuit trace running along the surface of the flex circuit.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: March 13, 2012
    Assignee: Quellan, Inc.
    Inventors: Edward Gebara, Andrew Joo Kim, Joy Laskar, Anthony Stelliga, Emmanouil M. Tentzeris
  • Patent number: 8068406
    Abstract: Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.
    Type: Grant
    Filed: October 19, 2009
    Date of Patent: November 29, 2011
    Assignee: Quellan, Inc.
    Inventors: Andrew Joo Kim, Michael G. Vrazel, Sanjay Bajekal, Charles Summers
  • Patent number: 8005430
    Abstract: Signals propagating on an aggressor communication channel can cause interference in a victim communication channel. A sensor coupled to the aggressor channel can obtain a sample of the aggressor signal. The sensor can be integrated with or embedded in a system, such as a flex circuit or a circuit board, that comprises the aggressor channel. The sensor can comprise a dedicated conductor or circuit trace that is near an aggressor conductor, a victim conductor, or an EM field associated with the interference. An interference compensation circuit can receive the sample from the sensor. The interference compensation circuit can have at least two operational modes of operation. In the first mode, the circuit can actively generate or output a compensation signal that cancels, corrects, or suppresses the interference. The second mode can be a standby, idle, power-saving, passive, or sleep mode.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: August 23, 2011
    Assignee: Quellan Inc.
    Inventors: Edward Gebara, Andrew Joo Kim, Joy Laskar, Anthony Stelliga, Emmanouil M. Tentzeris
  • Patent number: 7934144
    Abstract: A method and system using the principle of generalized maximum likelihood estimation to resolve sample timing uncertainties that are associated with the decoding of communication signals. By using generalized maximum likelihood estimation, sample timing uncertainty can be resolved by taking multiple samples of the received signal within a symbol period and determining which sample best corresponds to the optimal sample timing. The sample which best corresponds to the optimal sample timing can be determined from a timing index which can be calculated from ambiguity indicators that are based on the samples of the received signal.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: April 26, 2011
    Assignee: Quellan, Inc.
    Inventors: Andrew Joo Kim, Stephen E. Ralph, Sanjay Bajekal
  • Publication number: 20110069604
    Abstract: A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay.
    Type: Application
    Filed: August 25, 2010
    Publication date: March 24, 2011
    Applicant: Quellan, Inc.
    Inventors: Bruce C. Schmukler, Arvind Raghavan, Ziba Nami, Jyothi Emmanuel Peddi, Andrew Joo Kim, Michael G. Vrazel, Charles E. Summers
  • Publication number: 20100301671
    Abstract: A power extractor suitable for locations proximate to the sink of a signal channel is disclosed. The power extractor can generate power from the signal channel without substantially disturbing a quality of signals within the channel. In one embodiment, the power extraction circuit can include: a current source coupled to a sink side of a signal channel, where the signal channel is independent of any power supply signal, the current source being high impedance to maintain signal quality within the signal channel; a first regulator configured to generate a first regulated supply from a current derived from the signal channel using the current source; and a second regulator coupled to the first regulator, where the second regulator is configured to generate a second regulated supply from the first regulated supply.
    Type: Application
    Filed: June 2, 2009
    Publication date: December 2, 2010
    Applicant: Quellan, Inc.
    Inventors: Georgios Asmanis, Faouzi Chaahoub