Patents by Inventor John Mark Royle
John Mark Royle 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: 10833901Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: GrantFiled: October 17, 2016Date of Patent: November 10, 2020Assignee: Metrotech CorporationInventors: Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu, John Mark Royle
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Patent number: 10338263Abstract: In accordance with some embodiments, a method and apparatus for providing both a low-pass filter value and a high-pass filter value is presented. The combined filter receives an input value into a half-band finite impulse response (FIR) filter with an odd number of taps labeled 0 through N with corresponding filter coefficients labeled 0 through N where odd numbered filter coefficients are zero, the FIR filter providing a filter value. The median value from the FIR filter is digitally shifted to provide a half median value. The half median value is added to the filter value to provide the low-pass filter value and is subtracted from the filter value to provide the high-pass filter value.Type: GrantFiled: July 6, 2015Date of Patent: July 2, 2019Assignee: Metrotech CorporationInventors: John Mark Royle, Stephen John Petherick
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Patent number: 10310130Abstract: An apparatus that uses harmonics of the power line frequency at which electrical power is distributed is presented. The apparatus includes a sensor antenna to detect an electromagnetic field produced by a cable. The output of the sensor is fed to a mixer together with a signal from a sine wave generator at less than the fundamental power frequency to frequency shift the signals from the sensor. The mixed output is then amplified to provide an audible output. A single comb filter receives signals from the mixer and outputs a filtered signal removing non-harmonic frequencies but preferably passing both odd and even harmonics. The output of the comb filter is then integrated at and displayed to indicate the detection of a cable based on the filtered signal.Type: GrantFiled: February 18, 2015Date of Patent: June 4, 2019Assignee: Metrotech CorporationInventors: Johan Overby, John Mark Royle
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Publication number: 20170099168Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: ApplicationFiled: October 17, 2016Publication date: April 6, 2017Inventors: STEPHEN JOHN PETHERICK, George MAINESCU, Ion DRACEA, Razvan Gabriel STEFANOIU, John Mark ROYLE
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Publication number: 20170010381Abstract: In accordance with some embodiments, a method and apparatus for providing both a low-pass filter value and a high-pass filter value is presented. The combined filter receives an input value into a half-band finite impulse response (FIR) filter with an odd number of taps labeled 0 through N with corresponding filter coefficients labeled 0 through N where odd numbered filter coefficients are zero, the FIR filter providing a filter value. The median value from the FIR filter is digitally shifted to provide a half median value. The half median value is added to the filter value to provide the low-pass filter value and is subtracted from the filter value to provide the high-pass filter value.Type: ApplicationFiled: July 6, 2015Publication date: January 12, 2017Inventors: John Mark Royle, Stephen John Petherick
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Patent number: 9473203Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: GrantFiled: April 30, 2013Date of Patent: October 18, 2016Assignee: METROTECH CORPORATIONInventors: Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu, John Mark Royle
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Publication number: 20150234076Abstract: An apparatus that uses harmonics of the power line frequency at which electrical power is distributed is presented. The apparatus includes a sensor antenna to detect an electromagnetic field produced by a cable. The output of the sensor is fed to a mixer together with a signal from a sine wave generator at less than the fundamental power frequency to frequency shift the signals from the sensor. The mixed output is then amplified to provide an audible output. A single comb filter receives signals from the mixer and outputs a filtered signal removing non-harmonic frequencies but preferably passing both odd and even harmonics. The output of the comb filter is then integrated at and displayed to indicate the detection of a cable based on the filtered signal.Type: ApplicationFiled: February 18, 2015Publication date: August 20, 2015Inventors: Johan OVERBY, John Mark ROYLE
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Publication number: 20130287125Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: ApplicationFiled: April 30, 2013Publication date: October 31, 2013Applicant: Vivax-MetrotechInventors: Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu, John Mark Royle
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Patent number: 8566043Abstract: A detector for calculating the distortion of an electromagnetic field produced by a buried current carrying conductor comprises three antennas B, M, T. Outputs of two pairs of antennas are compared and the depth of the buried conductor is calculated using two different methods. If there is a significant difference in the two calculated depths then it is deemed that the electromagnetic field produced by the buried current carrying conductor is significantly distorted by the material in which the conductor is buried.Type: GrantFiled: March 2, 2009Date of Patent: October 22, 2013Assignee: Radiodetection LimitedInventors: John Mark Royle, Richard David Pearson
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Patent number: 8183851Abstract: A detector for calculating a depth of a buried conductor is provided. The detector includes first, second and third antennas and a microprocessor. The second antenna has an axis parallel to an axis of the first antenna and is spaced a distance s from the first antenna. The third antenna has an axis parallel to the axes of the first and second antennas and is spaced a distance 2s from the first antenna and a distance s from the second antenna. The microprocessor is configured to compare magnetic fields at the first and second antennas to produce a first compared value, compare magnetic fields at the first and third antennas to produce a second compared value, and calculate the depth of said buried conductor based on the first and second compared values.Type: GrantFiled: March 2, 2009Date of Patent: May 22, 2012Assignee: RadiodetectionInventors: John Mark Royle, Richard David Pearson
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Patent number: 8125210Abstract: A detector for calculating a depth of a buried conductor is provided. The detector includes a plurality of antennas for detecting an electromagnetic field radiated by the conductor and one or more signal processors for calculating the depth of the conductor based on the field detected by the antennas. The calculated depth of the conductor is displayed when one or more predetermined criteria are satisfied.Type: GrantFiled: March 2, 2009Date of Patent: February 28, 2012Assignee: Radiodetection LimitedInventors: John Mark Royle, Richard David Pearson
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Patent number: 8058874Abstract: A system for detecting a buried conductor comprises a transmitter for producing an alternating test current in the buried conductor and a receiver for detecting an electromagnetic field produced by the test current in the buried conductor. A communication link is provided between the receiver and the transmitter. The receiver measures the signal to noise ratio, SNR, of the electromagnetic field produced by the test current and if the SNR is below a threshold then the receiver controls the transmitter to set frequency and/or power characteristics of the test current.Type: GrantFiled: March 2, 2009Date of Patent: November 15, 2011Assignee: Radiodetection LimitedInventors: John Mark Royle, Jeff Thompson
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Patent number: 7994770Abstract: A system for detecting a buried conductor comprises a transmitter for generating a test signal in the buried conductor and a detector for detecting an electromagnetic signal resulting from the test signal flowing in the buried conductor. The transmitter comprises a waveform generator for generating a drive waveform signal, a power supply, an amplifier, connected to the power supply and the waveform generator for producing an output drive signal based on the drive waveform signal and an output circuit for acting on the output drive signal to generate an output signal having a current and a voltage. In-phase and quadrature components of the current and voltage of the output signal are fed back for controlling the amplifier.Type: GrantFiled: March 2, 2009Date of Patent: August 9, 2011Assignee: Radiodetection LimitedInventors: John Mark Royle, Richard David Pearson
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Patent number: 7969137Abstract: A system for detecting a buried conductor comprises a transmitter for producing an alternating test current in the buried conductor and a receiver for detecting an electromagnetic field produced by the test current in the buried conductor. A communication link is provided between the receiver and the transmitter. The test current comprises first and second components of different frequency. The receiver monitors the phase creepage of the first and second components and controls the transmitter to reset the phase difference between the first and second components as phase creepage increases.Type: GrantFiled: March 2, 2009Date of Patent: June 28, 2011Assignee: Radiodetection LimitedInventor: John Mark Royle
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Patent number: 7847556Abstract: A detector 1 for detecting a buried current carrying conductor comprises a digital homodyne receiver. The receiver processes field strength signals induced in a pair of vertically spaced antennae 3, 5. The analogue to digital converter is an audio-grade stereo CODEC 11.Type: GrantFiled: June 20, 2006Date of Patent: December 7, 2010Assignee: Radiodetection LimitedInventor: John Mark Royle
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Publication number: 20100001732Abstract: A detector for calculating a depth of a buried conductor comprises three parallel antennas B, M, T. The second antenna M is spaced a distance s from the first antenna B and the third antenna T is a distance 2s from the first antenna B and a distance s from the second antenna M. The outputs of the first and second antennas B, M are compared and the outputs from the second and third antennas M, T are compared. The depth of the buried conductor is calculated based on the first and second compared values.Type: ApplicationFiled: March 2, 2009Publication date: January 7, 2010Applicant: RADIODETECTION LIMITEDInventors: John Mark Royle, Richard David Pearson
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Publication number: 20100001731Abstract: A system for detecting a buried conductor comprises a transmitter for generating a test signal in the buried conductor and a detector for detecting an electromagnetic signal resulting from the test signal flowing in the buried conductor. The transmitter comprises a waveform generator for generating a drive waveform signal, a power supply, an amplifier, connected to the power supply and the waveform generator for producing an output drive signal based on the drive waveform signal and an output circuit for acting on the output drive signal to generate an output signal having a current and a voltage. In-phase and quadrature components of the current and voltage of the output signal are fed back for controlling the amplifier.Type: ApplicationFiled: March 2, 2009Publication date: January 7, 2010Applicant: RADIODETECTION LIMITEDInventors: John Mark Royle, Richard David Pearson
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Publication number: 20100001714Abstract: A detector for calculating a depth of a buried conductor comprises a plurality of antennas B, M T for detecting an electromagnetic field radiated by the conductor and means for calculating the depth of said conductor based on the field detected by the antennas B, M, T. The calculated depth of the conductor is displayed when one or more predetermined criteria are satisfied.Type: ApplicationFiled: March 2, 2009Publication date: January 7, 2010Applicant: RADIODETECTION LIMITEDInventor: John Mark Royle
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Publication number: 20100004880Abstract: A detector for calculating the distortion of an electromagnetic field produced by a buried current carrying conductor comprises three antennas B, M, T. Outputs of two pairs of antennas are compared and the depth of the buried conductor is calculated using two different methods. If there is a significant difference in the two calculated depths then it is deemed that the electromagnetic field produced by the buried current carrying conductor is significantly distorted by the material in which the conductor is buried.Type: ApplicationFiled: March 2, 2009Publication date: January 7, 2010Applicant: RADIODETECTION LIMITEDInventors: John Mark Royle, Richard David Pearson
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Publication number: 20100001713Abstract: A system for detecting a buried conductor comprises a transmitter for producing an alternating test current in the buried conductor and a receiver for detecting an electromagnetic field produced by the test current in the buried conductor. A communication link is provided between the receiver and the transmitter. The test current comprises first and second components of different frequency. The receiver monitors the phase creepage of the first and second components and controls the transmitter to reset the phase difference between the first and second components as phase creepage increases.Type: ApplicationFiled: March 2, 2009Publication date: January 7, 2010Applicant: RADIODETECTION LIMITEDInventor: John Mark Royle