Patents Assigned to TranSwitch Corporation
  • Patent number: 8837573
    Abstract: A method for compensating for gain changes of an N-level pulse amplitude modulation (PAM-N) modulated signal. The method comprises comparing the PAM-N modulated signal to N?1 configurable thresholds, wherein the input PAM-N modulated signal is also equalized and the N?1 configurable thresholds are N?1 different voltage levels; tracking gain changes in the input PAM-N modulated signal by comparing the input PAM-N modulated signal to a compensation threshold; and adjusting a level of the at least one of the N?1 configurable thresholds of the N?1 comparators based on an output of the compensation comparator, thereby offsetting a crossing point of the at least one comparator respective of the at least one of the N?1 configurable thresholds to compensate for gain changes in the input PAM-N modulated signal.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: September 16, 2014
    Assignee: Transwitch Corporation
    Inventors: Eran Doron, Baruch Meborach Bublil, Yaron Slezak, Idan Versano
  • Patent number: 8804809
    Abstract: A decision feedback equalizer (DFE) for equalizing PAM-N signals comprises a coefficient setting unit for setting a first group of most significant feedback coefficients of the DFE to a predefined value selected from a group of predefined values; a coefficients computation unit coupled to the coefficient setting unit for computing values of feedback coefficients of a second group of feedback coefficients other than the first group of most significant feedback coefficients; a feedback (FB) unit for mitigating, using a complete group of feedback coefficients, effects of interference from data symbols that are adjacent in time to an input data symbol, wherein most significant feedback coefficients of the first group are set to an optimal value computed during an initialization of the DFE and feedback coefficients of the second group are computed by the coefficients computation unit.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: August 12, 2014
    Assignee: TranSwitch Corporation
    Inventors: Dan Raphaeli, Yaron Slezak
  • Publication number: 20140105230
    Abstract: An apparatus for enabling simultaneous multimedia content and user data streaming from a handheld device to a display device is disclosed. The apparatus enables power charging of the handheld device while streaming the multimedia content and the user data from the handheld device. The apparatus comprises a data-multimedia-power interface (DMPI) connector installed in the handheld device and designed to enable the transport of at least high definition multimedia signals, data signals, a power signal, and control signals between the handheld device and the display device; and a DMPI circuit for multiplexing the high definition multimedia signals with the data signals, to enable simultaneous streaming of the respective multimedia content and the user data to the display device, wherein the DMPI circuit further extracts a power signal from the display device for power charging of the display device.
    Type: Application
    Filed: October 16, 2012
    Publication date: April 17, 2014
    Applicant: TRANSWITCH CORPORATION
    Inventors: Ziv Kabiry, Amir Bar-Niv, Shlomy Chaikin
  • Patent number: 8594262
    Abstract: An interface circuit for enabling clock and data recovery (CDR) of N-level pulse amplitude modulation (N-PAM) modulated data streams using a 2-PAM CDR circuit. The circuit comprises a number of N?1 comparators for comparing an input data stream to N?1 configurable thresholds, the input data stream is N-PAM modulated and the N?1 configurable thresholds are N?1 different voltage levels; a number of N?1 of edge detectors respectively connected to the N?1 comparators for detecting transitions from one logic value to another logic value, N is a discrete number greater than two; and a determination unit for determining if the detected transitions is any one of a major transition and a minor transition and asserting a transition signal if only a major transition or a minor transition has occurred, the transition signal is fed into a 2-PAM CDR circuit and utilized for recovering a clock signal of the input data stream.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: November 26, 2013
    Assignee: TranSwitch Corporation
    Inventors: Yaron Slezak, Genady Veytsman
  • Patent number: 8576903
    Abstract: A PAM-N decision feedback equalizer (DFE) comprises a coefficient computation unit; a feedback unit that mitigates, using computed feedback coefficients, effects of interference from data symbols; an error-and-decision unit for at least computing a least error value respective to one of a plurality of decision levels, wherein the least error value indicates a difference of a pseudo equalized input PAM-N data symbol from an optimal position of the one of the plurality of decision levels, wherein the one of the plurality of decision levels corresponds to a modulation level used to modulate data in the input PAM-N data symbol; and a calibration unit for adaptively setting the plurality of decision levels based, in part, on the least error value, thereby enabling for compensating for gain changes resulted by a cable on which the input PAM-N data symbol is received and further compensating for embedded offsets of the error-and-decision unit.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: November 5, 2013
    Assignee: TranSwitch Corporation
    Inventors: Dan Raphaeli, Yaron Slezak
  • Publication number: 20130217274
    Abstract: A universal connector for enabling interoperability between different types of data interfaces and multimedia interfaces comprises a housing; and a plurality of contact pins arranged in the housing, wherein the plurality of contact pins provide connectivity for multimedia display interface signals and data interface signals, wherein the housing includes a first part and a second part coupled together, wherein the first part includes a first group of contact pins and the second part includes a second group of contact pins, wherein the first group of contact pins provides connectivity to a data interface and the second group of contact pins provides, in part, connectivity to a multimedia interface.
    Type: Application
    Filed: March 28, 2013
    Publication date: August 22, 2013
    Applicant: TRANSWITCH CORPORATION
    Inventor: Transwitch Corporation
  • Publication number: 20130187483
    Abstract: A sink circuit for protecting connectivity of a digital multimedia interface, the sink circuit is connected in a sink multimedia device. The sink circuit comprises a sink port configured to provide a connection to a source multimedia device; a termination coupled to the sink port; and a protection component coupled in series between the termination and a power source of the sink multimedia device, the protection component blocks any direct current path through the sink port when the sink multimedia device is off and the power source of the source multimedia device is on.
    Type: Application
    Filed: January 23, 2012
    Publication date: July 25, 2013
    Applicant: TRANSWITCH CORPORATION
    Inventors: Yaron Slezak, Genady Veytsman, Evgeny Rogachov, Gilad Kirshenboim
  • Publication number: 20130187699
    Abstract: A circuit for switching between an AC-coupled connectivity and DC-coupled connectivity of a multimedia interface. The circuit comprises a current source connected in series to a wire of the multimedia interface and a coupling capacitor; and a termination resistor connected to the current source and to the coupling capacitor, wherein the circuit is connected in series between a source line driver and a sink line receiver of the multimedia interface, wherein the source line driver supports both the AC-coupled connectivity and the DC-coupled connectivity and the sink line receiver supports any one of the AC-coupled connectivity and the DC-coupled connectivity, wherein the current source and the termination resistor allows the setting of voltage levels of signals received at the sink line receiver to voltage levels defined by the multimedia interface thereby to switch to the coupling connectivity type required by the multimedia interface at which the sink line receiver operates.
    Type: Application
    Filed: January 18, 2013
    Publication date: July 25, 2013
    Applicant: TRANSWITCH CORPORATION
    Inventor: TRANSWITCH CORPORATION
  • Patent number: 8472351
    Abstract: A Fast Ethernet and HDMI Ethernet channel (HEC) physical layer circuit. The physical layer circuit comprises a Fast Ethernet physical layer module implementing a physical layer specification of a Fast Ethernet communication standard; a hybrid circuit connected to the fast Ethernet physical layer module using a first twisted-pair wire and a second twisted-pair wire and capable of processing transmit and receive HDMI Ethernet channel (HEC) signals concurrently transported over a third twisted-pair wire; a switch for bypassing the hybrid circuit; and a controller for controlling the operation the hybrid circuit and the switch according to the operating mode of the physical layer circuit, wherein the operation mode of the physical layer circuit is any of a fast Ethernet and a HEC.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: June 25, 2013
    Assignee: TranSwitch Corporation
    Inventors: Amir Bar-Niv, Genady Veytsman
  • Publication number: 20130128943
    Abstract: A method for compensating for gain changes of an N-level pulse amplitude modulation (PAM-N) modulated signal. The method comprises comparing the PAM-N modulated signal to N?1 configurable thresholds, wherein the input PAM-N modulated signal is also equalized and the N?1 configurable thresholds are N?1 different voltage levels; tracking gain changes in the input PAM-N modulated signal by comparing the input PAM-N modulated signal to a compensation threshold; and adjusting a level of the at least one of the N?1 configurable thresholds of the N?1 comparators based on an output of the compensation comparator, thereby offsetting a crossing point of the at least one comparator respective of the at least one of the N?1 configurable thresholds to compensate for gain changes in the input PAM-N modulated signal.
    Type: Application
    Filed: November 17, 2011
    Publication date: May 23, 2013
    Applicant: TRANSWITCH CORPORATION
    Inventors: Eran Doron, Baruch Meborach Bublil, Yaron Slezak, Idan Versano
  • Publication number: 20130094561
    Abstract: A PAM-N decision feedback equalizer (DFE) comprises a coefficient computation unit; a feedback unit that mitigates, using computed feedback coefficients, effects of interference from data symbols; an error-and-decision unit for at least computing a least error value respective to one of a plurality of decision levels, wherein the least error value indicates a difference of a pseudo equalized input PAM-N data symbol from an optimal position of the one of the plurality of decision levels, wherein the one of the plurality of decision levels corresponds to a modulation level used to modulate data in the input PAM-N data symbol; and a calibration unit for adaptively setting the plurality of decision levels based, in part, on the least error value, thereby enabling for compensating for gain changes resulted by a cable on which the input PAM-N data symbol is received and further compensating for embedded offsets of the error-and-decision unit.
    Type: Application
    Filed: October 18, 2011
    Publication date: April 18, 2013
    Applicant: TRANSWITCH CORPORATION
    Inventors: Dan Raphaeli, Yaron Slezak
  • Publication number: 20130064281
    Abstract: A decision feedback equalizer (DFE) for equalizing PAM-N signals comprises a coefficient setting unit for setting a first group of most significant feedback coefficients of the DFE to a predefined value selected from a group of predefined values; a coefficients computation unit coupled to the coefficient setting unit for computing values of feedback coefficients of a second group of feedback coefficients other than the first group of most significant feedback coefficients; a feedback (FB) unit for mitigating, using a complete group of feedback coefficients, effects of interference from data symbols that are adjacent in time to an input data symbol, wherein most significant feedback coefficients of the first group are set to an optimal value computed during an initialization of the DFE and feedback coefficients of the second group are computed by the coefficients computation unit.
    Type: Application
    Filed: September 12, 2011
    Publication date: March 14, 2013
    Applicant: TRANSWITCH CORPORATION
    Inventors: Dan Raphaeli, Yaron Slezak
  • Patent number: 8238413
    Abstract: An adaptive equalizer for high-speed serial data comprises a programmable equalizer for equalizing an input serial data signal to generate an equalized serial data signal, wherein the equalization is based on an optimal equalization mode; a signal quality meter for computing an eye width indication based on the equalized serial data signal, wherein the eye width indication is an indicative of the quality of the equalized serial data signal; and a decision unit for determining the optimal equalization mode based on the eye width indication.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: August 7, 2012
    Assignee: TranSwitch Corporation
    Inventors: Wolfgang Roethig, Genady Veytsman
  • Publication number: 20120077384
    Abstract: An apparatus for enabling simultaneous multimedia content streaming and power charging of handheld devices, comprises a universal connector installed in a first device and enables connectivity of at least one multimedia display interface and at least one data interface with a second device, the first device is connected to the second device using a charging-streaming cable having, at one end, a first connector compliant with the universal connector, and at the other end, a second connector compliant with a multimedia display interface and a third connector compliant with a data interface of the second device, wherein streaming of the multimedia content is from the universal connector in the first device to the second connector in the second device and power charging of the first device is through the third connector of the second device; and a detector for determining a type of the multimedia display interface of the second device.
    Type: Application
    Filed: December 6, 2011
    Publication date: March 29, 2012
    Applicant: TRANSWITCH CORPORATION
    Inventors: Amir Bar-Niv, Ziv Kabiry, Yaron Slezak
  • Publication number: 20120079140
    Abstract: A triple-mode connectivity apparatus for enabling interoperability between a multimedia display interface and a data interface. The apparatus comprises a universal connector installed in a first device and structured to enable connectivity between the multimedia display interface and the data interface of a second device, the first device is connected to the second device using a cable having a first connector compliant with the universal connector and a second connecter compliant with the data interface of the second device; a physical layer interface for processing signals compliant with the multimedia display interface and the data interface; and a detector for detecting an interface type of the second device and setting the apparatus to process signals according to the determined interface type.
    Type: Application
    Filed: December 6, 2011
    Publication date: March 29, 2012
    Applicant: TRANSWITCH CORPORATION
    Inventors: Amir Bar-Niv, Ziv Kabiry, Yaron Slezak
  • Patent number: 8112572
    Abstract: An apparatus for swapping output high-speed multimedia signals. In one embodiment the apparatus comprises a plurality of inputs coupled to a multimedia transmitter; a plurality of outputs coupled to a plurality of pins of a multimedia interface connector; and a controller for generating a control signal for configuring an order in which the plurality of inputs are routed to the plurality of outputs, wherein the order in which the plurality of inputs are routed to the plurality of outputs is set to enable un-crossing of one or more conducting wires coupling the plurality of inputs to the multimedia transmitter and to enable un-crossing of one or more conducting wires coupling the plurality of outputs and the plurality of pins of the multimedia interface connector.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: February 7, 2012
    Assignee: TranSwitch Corporation
    Inventor: Amir Bar-Niv
  • Patent number: 8098690
    Abstract: A system and method for transferring high-definition multimedia signals over four twisted-pairs. The system includes a multimedia source for transmitting multimedia data and source-to-sink management data to a multimedia sink over a first channel, a second channel and a third channel wherein the multimedia source is further being capable of transmitting a clock signal to the multimedia sink over a fourth channel; and a multimedia sink for transferring sink-to-source management data to the multimedia source over the fourth channel. The clock signal and the sink-to-source management data are simultaneously transmitted over the fourth channel. Each of the channels comprises a single twisted-pair, thereby the channels can bounded in a twisted pair type cable comprising at least one of: Category 5, Category 5e, Category 6, and Category 6e.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: January 17, 2012
    Assignee: TranSwitch Corporation
    Inventors: Wolfgang Roethig, Amir Bar-Niv
  • Publication number: 20110317751
    Abstract: An adaptive equalizer for high-speed serial data comprises a programmable equalizer for equalizing an input serial data signal to generate an equalized serial data signal, wherein the equalization is based on an optimal equalization mode; a signal quality meter for computing an eye width indication based on the equalized serial data signal, wherein the eye width indication is an indicative of the quality of the equalized serial data signal; and a decision unit for determining the optimal equalization mode based on the eye width indication.
    Type: Application
    Filed: June 23, 2010
    Publication date: December 29, 2011
    Applicant: TRANSWITCH CORPORATION
    Inventors: Wolfgang ROETHIG, Genady VEYTSMAN
  • Publication number: 20110311008
    Abstract: An interface circuit for enabling clock and data recovery (CDR) of N-level pulse amplitude modulation (N-PAM) modulated data streams using a 2-PAM CDR circuit. The circuit comprises a number of N?1 comparators for comparing an input data stream to N?1 configurable thresholds, the input data stream is N-PAM modulated and the N?1 configurable thresholds are N?1 different voltage levels; a number of N?1 of edge detectors respectively connected to the N?1 comparators for detecting transitions from one logic value to another logic value, N is a discrete number greater than two; and a determination unit for determining if the detected transitions is any one of a major transition and a minor transition and asserting a transition signal if only a major transition or a minor transition has occurred, the transition signal is fed into a 2-PAM CDR circuit and utilized for recovering a clock signal of the input data stream.
    Type: Application
    Filed: June 10, 2011
    Publication date: December 22, 2011
    Applicant: TranSwitch Corporation
    Inventors: Yaron SLEZAK, Genady VEYTSMAN
  • Publication number: 20110239257
    Abstract: A multimode physical (MMP) layer circuit for physical (PHY) layer handling of signals transported over a high-definition multimedia interface (HDMI) cable in a home multimedia network, wherein the signals are compliant with at least two different PHY layer modes. The MMP layer circuits comprises a plurality of PHY transceivers respectively coupled to a plurality of TP channels of the HDMI cable through a HDMI connector, wherein each PHY transceiver of the plurality of PHY transceivers handles signals transported over its respective TP channel according to a PHY layer mode of the transported signals; and a controller is coupled to the HDMI connector and to each of the plurality of PHY transceivers, the controller recognizes the PHY layer mode of signals transported over each of the plurality of TP channels and sets each of the plurality of PHY transceivers according to the recognized PHY layer mode.
    Type: Application
    Filed: June 13, 2011
    Publication date: September 29, 2011
    Applicant: TRANSWITCH CORPORATION
    Inventor: Amir Bar-Niv