Patents Assigned to Redmere Technology Ltd.
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Patent number: 8295296Abstract: An HDMI cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. High-frequency loss and differential skew within a differential signal may be compensated by analog circuits embedded in the cable. These embedded circuits are tuned at production for best performance by observing the quality of the recovered analog signal. The embedded circuits are powered by a combination of power sources, both carried within the cable, and harvested from the high-speed signals themselves.Type: GrantFiled: July 18, 2007Date of Patent: October 23, 2012Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan
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Patent number: 8280668Abstract: A High Definition Multi-Media Interface (HDMI) cable may exhibit frequency dependent signal attenuation, inter symbol interference, and inter-pair skew. A boost device integrated with the cable can compensate for such impairments of the cable. A self calibrating cable with a boost device of the embodiment of the invention is described, in which parameters that control the response of the boost device are set optimally in a self-calibrating process comprising looping the boosted cable on itself through a calibration fixture that contains a calibration control device. The boost device includes pattern generators and a sampling circuit. Each high speed channel of the cable is separately tested and calibrated with the help of one of the other channels serving as a sampling channel. Additional embodiments provide for a selected replica boost device and a distinct pattern generator device in the calibration fixture.Type: GrantFiled: July 30, 2009Date of Patent: October 2, 2012Assignee: Redmere Technology Ltd.Inventors: John Martin Horan, John Anthony Keane, Gerard David Guthrie
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Patent number: 8280669Abstract: An HDMI cable may exhibit frequency dependent signal attenuation, inter symbol interference, and inter-pair skew. A boost device integrated with the cable can compensate for such impairments of the cable. A self calibrating cable with a boost device of the embodiment of the invention is described, in which parameters that control the response of the boost device are set optimally in a self-calibrating process including looping the boosted cable on itself through a calibration fixture that contains a calibration control device. The boost device includes pattern generators and a sampling circuit. Each high speed channel of the cable is separately tested and calibrated with the help of one of the other channels serving as a sampling channel.Type: GrantFiled: June 6, 2011Date of Patent: October 2, 2012Assignee: Redmere Technology Ltd.Inventors: John Martin Horan, John Anthony Keane, Gerard David Guthrie
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Patent number: 8272023Abstract: A High Definition Multimedia Interface (HDMI) cable carries high speed encoded data, which are transmitted differentially over data channels, along with a clock. A Mobile High-Definition Link (MHL) cable carries high speed data which are multiplexed to achieve smaller connectors with fewer pins. A MHL-to-HDMI cable is proposed, which includes an embedded MHL to HDMI adapter device for demultiplexing the received MHL-formatted signal and outputting an HDMI-formatted signal. The embedded circuit is powered by a combination of power sources, the power being harvested from the high-speed HDMI signals themselves, including a startup circuit harvesting power from a low speed HDMI signal when power from the high-speed HDMI signals is not available.Type: GrantFiled: June 9, 2010Date of Patent: September 18, 2012Assignee: Redmere Technology Ltd.Inventors: John Martin Horan, David McGowan
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Patent number: 8073647Abstract: A High Definition Multi-Media Interface (HDMI) cable may exhibit frequency dependent signal attenuation, inter symbol interference, and inter-pair skew. A boost device integrated with the cable can compensate for such impairments of the cable. A self calibrating cable with a boost device of the embodiment of the invention is described, in which parameters that control the response of the boost device are set optimally in a self-calibrating process comprising looping the boosted cable on itself through a calibration fixture that contains a calibration control device. The boost device includes pattern generators and a sampling circuit. Each high speed channel of the cable is separately tested and calibrated with the help of one of the other channels serving as a sampling channel. Additional embodiments provide for a selected replica boost device and a distinct pattern generator device in the calibration fixture.Type: GrantFiled: July 30, 2009Date of Patent: December 6, 2011Assignee: Redmere Technology Ltd.Inventors: John Martin Horan, John Anthony Keane, Gerard David Guthrie
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Patent number: 8058918Abstract: An HDMI cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. High-frequency loss and differential skew within a differential signal may be compensated by analog circuits embedded in the cable. These embedded circuits are tuned at production for best performance by observing the quality of the recovered analog signal. The embedded circuits are powered by a combination of power sources, both carried within the cable, and harvested from the high-speed signals themselves.Type: GrantFiled: July 18, 2007Date of Patent: November 15, 2011Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan
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Patent number: 8006277Abstract: A method for providing power to a boost device in a high-speed cable connected between a transmitting data source device and a receiving data sink device is described. The method comprises receiving differential data signals from the data source device in a differential input circuit of the boost device; boosting at least one of the received differential data signals into a boosted differential data signal; transmitting the boosted differential data signal from a differential output circuit of the boost device to the receiving data sink device; and obtaining power to operate at least some of the circuitry of the boost device from the data sink device through its connection with the differential output circuit, for example, providing at least some of the power to operate the processing block. A corresponding high-speed cable is also described.Type: GrantFiled: March 2, 2011Date of Patent: August 23, 2011Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan
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Patent number: 7996584Abstract: An HDMI cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. High-frequency loss and differential skew within a differential signal may be compensated by analog circuits embedded in the cable. These embedded circuits are tuned at production for best performance by observing the quality of the recovered analog signal. The embedded circuits are powered by a combination of power sources, both carried within the cable, and harvested from the high-speed signals themselves.Type: GrantFiled: July 18, 2007Date of Patent: August 9, 2011Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan
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Patent number: 7970567Abstract: An HDMI cable may exhibit frequency dependent signal attenuation, inter symbol interference, and inter-pair skew. A boost device integrated with the cable can compensate for such impairments of the cable. A self calibrating cable with a boost device of the embodiment of the invention is described, in which parameters that control the response of the boost device are set optimally in a self-calibrating process comprising looping the boosted cable on itself through a calibration fixture that contains a calibration control device. The boost device includes pattern generators and a sampling circuit. Each high speed channel of the cable is separately tested and calibrated with the help of one of the other channels serving as a sampling channel.Type: GrantFiled: July 25, 2008Date of Patent: June 28, 2011Assignee: Redmere Technology Ltd.Inventors: John Martin Horan, John Anthony Keane, Gerard David Guthrie
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Patent number: 7937605Abstract: A high-definition multimedia interface (HDMI) receiver recovers high speed encoded data which are transmitted differentially over data channels of a lossy cable, along with a clock. Inter symbol interference, high-frequency loss, skew between the clock and data channels, and differential skew within a differential signal are compensated by analog circuits which are automatically tuned for best performance by observing the quality of the recovered analog signal. Oversampling is used to provide a 24-bit digital representation of the analog signal for determining the quality of the signal. A corresponding method of deskewing a differential signal and a system and circuit therefor are also provided.Type: GrantFiled: January 13, 2007Date of Patent: May 3, 2011Assignee: Redmere Technology Ltd.Inventors: Judith Ann Rea, Aidan Gerard Keady, John Anthony Keane, John Martin Horan
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Patent number: 7936197Abstract: An HDMI cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. High-frequency loss and differential skew within a differential signal may be compensated by analog circuits embedded in the cable. These embedded circuits are tuned at production for best performance by observing the quality of the recovered analog signal. The embedded circuits are powered by a combination of power sources, both carried within the cable, and harvested from the high-speed signals themselves.Type: GrantFiled: February 12, 2009Date of Patent: May 3, 2011Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan
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Patent number: 7908634Abstract: A High-Definition Multimedia Interface (HDMI) cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. High-frequency loss and differential skew within a differential signal may be compensated by analog circuits embedded in the cable. These embedded circuits are tuned at production for best performance by observing the quality of the recovered analog signal. The embedded circuits are powered by a combination of power sources, both carried within the cable, and harvested from the high-speed signals themselves.Type: GrantFiled: July 30, 2009Date of Patent: March 15, 2011Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan
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Patent number: 7873980Abstract: A High Definition Multimedia Interface (HDMI) cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. A Mobile High-Definition Link (MHL) cable carries high speed data which are multiplexed to achieve smaller connectors with fewer pins. A MHL-to-HDMI cable is proposed which includes an embedded MHL to HDMI format conversion device for demultiplexing the received MHL-formatted signal and outputting an HDMI-formatted signal. The embedded device is powered by a combination of power sources, the power being harvested from the high-speed HDMI signals themselves.Type: GrantFiled: June 9, 2010Date of Patent: January 18, 2011Assignee: Redmere Technology Ltd.Inventors: John Martin Horan, Gerard David Guthrie
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Patent number: 7861277Abstract: An HDMI cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. High-frequency loss and differential skew within a differential signal may be compensated by analog circuits embedded in the cable. These embedded circuits are tuned at production for best performance by observing the quality of the recovered analog signal. The embedded circuits are powered by a combination of power sources, both carried within the cable, and harvested from the high-speed signals themselves.Type: GrantFiled: July 18, 2007Date of Patent: December 28, 2010Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan
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Patent number: 7809085Abstract: A high-definition multimedia interface (HDMI) receiver recovers high speed encoded data which are transmitted differentially over data channels of a lossy cable, along with a clock. Inter symbol interference, high-frequency loss, skew between the clock and data channels, and differential skew within a differential signal are compensated by analog circuits which are automatically tuned for best performance by observing the quality of the recovered analog signal. Oversampling is used to provide a 24-bit digital representation of the analog signal for determining the quality of the signal.Type: GrantFiled: January 13, 2007Date of Patent: October 5, 2010Assignee: RedMere Technology Ltd.Inventors: Judith Ann Rea, Aidan Gerard Keady, John Anthony Keane, John Martin Horan
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Patent number: 7793022Abstract: A digital bit-level repeater for joining two wired-AND buses such as the I2C bus is described. A protocol detector is used for tracking clock and data signals to determine the direction of the transfer. A state machine reads and regenerates the clock lines of both buses and provides the clock-stretching protocol feature on both buses. The repeater is designed to pass data bits from one bus to the other transparently when possible, and to latch and hold each data bit until the receiving bus can be clocked when clock-stretching occurs or when the bus is turned around.Type: GrantFiled: July 24, 2008Date of Patent: September 7, 2010Assignee: RedMere Technology Ltd.Inventors: James Denis Travers, Padraig Ryan
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Patent number: 7729874Abstract: An HDMI cable carries high speed encoded data which are transmitted differentially over data channels, along with a clock. High-frequency loss and differential skew within a differential signal may be compensated by analog circuits embedded in the cable. These embedded circuits are tuned at production for best performance by observing the quality of the recovered analog signal. The embedded circuits are powered by a combination of power sources, both carried within the cable, and harvested from the high-speed signals themselves. Corresponding method and system for calibrating the cable are also provided.Type: GrantFiled: July 18, 2007Date of Patent: June 1, 2010Assignee: Redmere Technology Ltd.Inventors: Aidan Gerard Keady, John Anthony Keane, Judith Ann Rea, Benjamin Griffin, John Martin Horan