Patents by Inventor Heping Ding
Heping Ding 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).
-
Publication number: 20230344360Abstract: A DC-DC converter for converting a low voltage DC input to a higher voltage DC output, the DC-DC converter comprising: an oscillator comprising a first relatively voltage sensitive and relatively low power transistor and a second relatively voltage insensitive and relatively high power transistor, the oscillator producing an AC signal from the low voltage DC input; a first transformer for converting the AC signal produced by the oscillator to a higher voltage AC signal; an autonomous, synchronous voltage-doubling rectification circuit for converting the higher voltage AC signal to the higher voltage DC output, wherein the autonomous, synchronous voltage-doubling rectification circuit comprises a second transformer, a first shunt switch and a second shunt switch; and wherein current through the second transformer controls the synchronous rectification.Type: ApplicationFiled: June 16, 2021Publication date: October 26, 2023Inventors: Heping DING, Ryan GRIFFIN
-
Patent number: 10778104Abstract: A DC-DC converter and method are provided for converting a low voltage DC input to a higher voltage DC output. The DC-DC converter has an oscillator with a first relatively voltage sensitive and relatively low power transistor and a second relatively voltage insensitive and relatively high power transistor, the oscillator producing an AC signal from the low voltage DC input. The inclusion of the voltage sensitive transistor allows the oscillator to turn on at a relatively low voltage. The inclusion of the higher power transistor allows the oscillator to operate at a higher power once it turns on. The DC-DC converter can be used for converting energy harvested from low voltage sources.Type: GrantFiled: September 14, 2018Date of Patent: September 15, 2020Assignee: NATIONAL RESEARCH COUNCIL OF CANADAInventors: Heping Ding, Ryan Griffin
-
Patent number: 10644044Abstract: Methods are provided for fabricating photodetector arrays using passive matrix addressing technology. The photodetector arrays use a pair of switching diode and photo diode to overcome crosstalk issues within the passive matrix. The switching diode and the photo diode of each pixel may be connected using a cathode-to-cathode connection, or an anode-to-anode connection. The photodetector arrays are fabricated by assembling on a first substrate, an array of photodetector pixels comprising a switching diode and a photo diode, providing conductive lines for each row of the array and conductive lines for each column of the array, and attaching a second substrate to the first substrate. The photodetector array may also be fabricated by assembling on a first substrate an array of switching diodes, and assembling on a second substrate an array of photo diodes, and bonding the first and second substrates together.Type: GrantFiled: May 31, 2018Date of Patent: May 5, 2020Assignee: National Research Council of CanadaInventors: Zhiyi Zhang, Ye Tao, Heping Ding, Salima Alem, Shoude Chang
-
Publication number: 20200091825Abstract: A DC-DC converter and method are provided for converting a low voltage DC input to a higher voltage DC output. The DC-DC converter has an oscillator with a first relatively voltage sensitive and relatively low power transistor and a second relatively voltage insensitive and relatively high power transistor, the oscillator producing an AC signal from the low voltage DC input. The inclusion of the voltage sensitive transistor allows the oscillator to turn on at a relatively low voltage. The inclusion of the higher power transistor allows the oscillator to operate at a higher power once it turns on. The DC-DC converter can be used for converting energy harvested from low voltage sources.Type: ApplicationFiled: September 14, 2018Publication date: March 19, 2020Inventors: HEPING DING, RYAN GRIFFIN
-
Publication number: 20190371834Abstract: Methods are provided for fabricating photodetector arrays using passive matrix addressing technology. The photodetector arrays use a pair of switching diode and photo diode to overcome crosstalk issues within the passive matrix. The switching diode and the photo diode of each pixel may be connected using a cathode-to-cathode connection, or an anode-to-anode connection. The photodetector arrays are fabricated by assembling on a first substrate, an array of photodetector pixels comprising a switching diode and a photo diode, providing conductive lines for each row of the array and conductive lines for each column of the array, and attaching a second substrate to the first substrate. The photodetector array may also be fabricated by assembling on a first substrate an array of switching diodes, and assembling on a second substrate an array of photo diodes, and bonding the first and second substrates together.Type: ApplicationFiled: May 31, 2018Publication date: December 5, 2019Inventors: Zhiyi ZHANG, Ye TAO, Heping DING, Salima ALEM, Shoude CHANG
-
Patent number: 10476367Abstract: A voltage and current triggered switch that turns on when a voltage across the switch reaches a turn-on voltage and that turns off when a current through the switch drops below a holding current. The switch features a Zener diode having a breakdown voltage. The Zener diode is connected to set the turn-on voltage of the switch to be the breakdown voltage of the Zener diode. Also provided is a step-down DC-DC converter comprising such a switch. Also provided is a system that has a tribo-electricity source or a piezo-electricity source, the provided step-down DC-DC converter and a load connected to an output of the stepdown DC-DC converter.Type: GrantFiled: March 23, 2018Date of Patent: November 12, 2019Assignee: NATIONAL RESEARCH COUNCIL OF CANADAInventors: Heping Ding, George Xiao, Ryan Griffin, Ye Tao
-
Publication number: 20190296631Abstract: A voltage and current triggered switch that turns on when a voltage across the switch reaches a turn-on voltage and that turns off when a current through the switch drops below a holding current. The switch features a Zener diode having a breakdown voltage. The Zener diode is connected to set the turn-on voltage of the switch to be the breakdown voltage of the Zener diode. Also provided is a step-down DC-DC converter comprising such a switch. Also provided is a system that has a tribo-electricity source or a piezo-electricity source, the provided step-down DC-DC converter and a load connected to an output of the stepdown DC-DC converter.Type: ApplicationFiled: March 23, 2018Publication date: September 26, 2019Inventors: HEPING DING, GEORGE XIAO, RYAN GRIFFIN, YE TAO
-
Patent number: 7436880Abstract: A method of adaptive filtering using fast affine projection (FAP) that allows for direct solution of the projected error vector from the autocorrelation matrix using a backward and forward recursion technique or LDLT factorization of the autocorrelation matrix followed by forward substitution, scaling and backward substitution. The method results in less computational complexity in the implementation, while still having good stability and fast convergence.Type: GrantFiled: August 17, 2004Date of Patent: October 14, 2008Assignee: National Research Council of CanadaInventor: Heping Ding
-
Patent number: 7330812Abstract: Methods and apparatus are provided for communicating an audio stream. A perceptual mask is estimated for an audio stream, based on the perceptual threshold of the human auditory system. A hidden sub-channel is dynamically allocated substantially below the estimated perceptual mask based on the characteristics of the audio stream, in which additional payload is transmitted. The additional payload can be related to components of the audio stream that would not otherwise be transmitted in a narrowband signal, or to concurrent services that can be accessed while the audio stream is being transmitted. A suitable receiver can recover the additional payload, whereas the audio stream will be virtually unaffected from a human auditory standpoint when received by a traditional receiver. A coding scheme is also provided in which a portion of a codec is used to code an upper-band portion of an audio stream, while the narrowband portion is left uncoded.Type: GrantFiled: September 10, 2003Date of Patent: February 12, 2008Assignee: National Research Council of CanadaInventor: Heping Ding
-
Publication number: 20060039458Abstract: A method of adaptive filtering using fast affine projection (FAP) that allows for direct solution of the projected error vector from the autocorrelation matrix using a backward and forward recursion technique or LDLT factorization of the autocorrelation matrix followed by forward substitution, scaling and backward substitution. The method results in less computational complexity in the implementation, while still having good stability and fast convergence.Type: ApplicationFiled: August 17, 2004Publication date: February 23, 2006Inventor: Heping Ding
-
Patent number: 6788785Abstract: A Fast Affine Projection (FAP) adaptive filter and method of adaptive filtering are disclosed, which reduce instability associated with FAP filters caused by error accumulation in the process of inversion of an autocorrelation matrix. The method provides updating of the adaptive filter coefficients by solving at least one system of linear equations whose coefficients are the autocorrelation matrix coefficients, by using a descending iterative method with intrinsic feedback. The results of the solution are used to update the adaptive filter coefficients. The approach is applicable for a normalized step size ranging from zero to unity, and allows either direct determination of updated filter coefficients without determining an inverse autocorrelation matrix, or, determining the inverse autocorrelation matrix by a descending iterative method. In some embodiments, a normalized step size is set close to unity, and the system of linear equations is solved by steepest descent or conjugate gradients methods.Type: GrantFiled: July 16, 1999Date of Patent: September 7, 2004Assignee: Nortel Networks LimitedInventor: Heping Ding
-
Patent number: 6754340Abstract: Stable adaptive filter and method are disclosed. The invention solves a problem of instability associated with Fast Affine Projection adaptive filters caused by error accumulation in an inversion process of an auto-correlation matrix. The Stable FAP uses a simplification of setting a normalized step size close to unity and reduces a problem of the matrix inversion to solving a system of linear equations whose solution coincides with a first column of the inverse auto-correlation matrix. The system of linear equations is then solved by one of descending iterative methods which provide inherent stability of operation due to intrinsic feedback adjustment. As a result, inevitable numerical errors are not accumulated, being corrected as the process goes on. In first and second embodiments of the invention the system of linear equation is solved by steepest descent and conjugate gradient methods respectively. Being immune to numerical errors, the invented method and filter are suitable for various DSP platforms, e.Type: GrantFiled: December 22, 1998Date of Patent: June 22, 2004Assignee: Nortel Networks LimitedInventor: Heping Ding
-
Publication number: 20040068399Abstract: Methods and apparatus are provided for communicating an audio stream. A perceptual mask is estimated for an audio stream, based on the perceptual threshold of the human auditory system. A hidden sub-channel is dynamically allocated substantially below the estimated perceptual mask based on the characteristics of the audio stream, in which additional payload is transmitted. The additional payload can be related to components of the audio stream that would not otherwise be transmitted in a narrowband signal, or to concurrent services that can be accessed while the audio stream is being transmitted. A suitable receiver can recover the additional payload, whereas the audio stream will be virtually unaffected from a human auditory standpoint when received by a traditional receiver. A coding scheme is also provided in which a portion of a codec is used to code an upper-band portion of an audio stream, while the narrowband portion is left uncoded.Type: ApplicationFiled: September 10, 2003Publication date: April 8, 2004Inventor: Heping Ding
-
Patent number: 6687723Abstract: An adaptive filter having a hybrid structure and capable of operating in a tri-mode regime is disclosed. The tri-mode adaptive filter includes three sub-filters which operate in a fast convergence mode, a slow convergence mode, and a freezing mode respectively. The adaptive filter further comprises a quality detector which measures non-convergence and a near-end signal of the tri-mode filter and generates a feedback signal which is sent to a switching means. In response to the feedback signal, the switching means provides switching between the sub-filters so that one of the sub-filters operates at a time, providing adaptive filtering in accordance with its corresponding filtering method.Type: GrantFiled: November 24, 2000Date of Patent: February 3, 2004Assignee: Nortel Networks LimitedInventor: Heping Ding
-
Patent number: 6226380Abstract: The invention provides an adaptive echo canceller and method for detecting double talk (DT) and echo path change (EPC) conditions and for distinguishing therebetween. DT and EPC conditions are detected by comparing a generated echo return loss enhancement (ERLE) signal with a selected ERLE threshold level. Similarly, the energy level of the echo canceller incoming signal is compared with a second threshold level. If the level of the ERLE signal is below its threshold and the level of the incoming signal is above the second threshold, a DT or EPC condition is deemed to exist and a predetermined signal is generated. Responsive to this signal, an orthogonality monitor recognizes the predetermined signal as representing either a DT or EPC condition.Type: GrantFiled: February 19, 1998Date of Patent: May 1, 2001Assignee: Nortel Networks LimitedInventor: Heping Ding
-
Patent number: 6178162Abstract: An improved echo canceller capable of reducing a magnitude of an echo signal propagating in a return channel of a communication device. The echo canceller includes an adaptive filter that models the echo path to generate an estimate of the echo. That estimate is subtracted from the echo-corrupted signal. The residual echo signal (error-signal) is then attenuated in a switching loss device. The switching loss device manifests a variable attenuation level selected in accordance with certain characteristics of the residual echo signal. These characteristics are the strength of the residual echo signal and its duration. For residual echo signals of very short duration, the attenuation level is set lower because those signals are perceived by the human ear as being weaker. For signals having a longer duration, the attenuation level is raised to inhibit the residual echo to acceptable levels.Type: GrantFiled: December 19, 1997Date of Patent: January 23, 2001Assignee: Nortel Networks CorporationInventors: David Dal Farra, Heping Ding
-
Patent number: 6049606Abstract: The invention provides an audio subsystem for use in a telephone terminal operable in handsfree mode and comprises a receive path including a receive transducer for generating audio signals from a received signal and a transmit path including a transmit transducer for converting audio signals to electrical signals for transmission to a far-end user. An acoustic echo canceller is communicatively coupled between the receive path and the transmit path and includes a subtractor circuit connected serially with the transmit transducer. The echo canceller is responsive to control signals for controlling the subtractor circuit. The subsystem comprises means for detecting a near-end talking condition including first circuit means for measuring the level of the total energy of the out-of-telephony-band components in the signal from the transmit transducer and circuit means for comparing the energy level represented by an output signal from the first measurement circuit to a first predetermined threshold.Type: GrantFiled: December 11, 1997Date of Patent: April 11, 2000Assignee: Nortel Networks CorporationInventors: Heping Ding, Frank Lau
-
Patent number: 5838787Abstract: A telephone terminal having handsfree functionality is provided with an audio system which controls echo return loss while permitting virtual full-duplex operation. The system, which has a variolosser in both the transmit and receive path and an acoustic echo canceller, also has a complementary variolosser which introduces additional echo return loss only when required and as a function of the state of the system.Type: GrantFiled: June 27, 1996Date of Patent: November 17, 1998Assignee: Northern Telecom LimitedInventors: Heping Ding, Scott McClennon
-
Patent number: 5796818Abstract: A system and method for dynamically optimizing the analog gain for a microphone in a telephone terminal operable in handsfree mode. The system makes use of a process whereby a relatively inexpensive analog to digital converter is used to meet gain requirements so as to accommodate the loudest echo through transmit path while maintaining an acceptable signal to noise ratio for the quietest talker. The system digital signal processor in conjunction with speech activity detection means is used to provide an optimum microphone gain under all circumstances.Type: GrantFiled: August 8, 1996Date of Patent: August 18, 1998Assignee: Northern Telecom LimitedInventors: Scott McClennon, Heping Ding, David Dal Farra