Patents by Inventor Jiashu Chen
Jiashu Chen 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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Publication number: 20140043101Abstract: The class-E amplifier can be tuned to pass only the fundamental frequency to the antenna by optimizing the second harmonics at the drain of the final PA driver transistor. A CPW in series with a capacitor between the PA transistor and the load forms a band pass filter that only allows the fundamental frequency to pass to the load of the antenna. A supply inductor to couple the drain of the final PA driver transistor to the power supply is tuned at the second harmonic with the parasitic capacitance of the drain of the PA transistor. A load capacitance is adjusted at the fundamental frequency to insure that the current waveform and voltage waveforms at the drain of the PA driver transistor do not overlap, thereby minimizing the parasitic power dissipation and allowing maximum energy to be applied to the antenna.Type: ApplicationFiled: August 10, 2012Publication date: February 13, 2014Applicant: Tensorcom, Inc.Inventor: Jiashu Chen
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Publication number: 20140043104Abstract: Herein is presented, a low power on-die 60 GHz distribution network for a beamforming system that can be scaled as the number of transmitters increases. The transmission line based power splitters and quadrature hybrids whose size would be proportional to a quarter wavelength (˜600 ?m) if formed using transmission lines are instead constructed by inductors/capacitors and reduce the area by more than 80%. An input in-phase I clock and an input quadrature Q clock are combined into a single composite clock waveform locking the phase relation between the in-phase I clock and quadrature Q clock. The composite clock is transferred over a single transmission line formed using a Co-planar Waveguide (CPW) coupling the source and destination locations over the surface of a die. Once the individuals the in-phase I and quadrature Q clocks are required, they can be generated at the destination from the composite clock waveform.Type: ApplicationFiled: August 10, 2012Publication date: February 13, 2014Applicant: Tensorcom, Inc.Inventor: Jiashu Chen
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Patent number: 8251582Abstract: A communications device with integrated case temperature measurement includes a case having at least one thermally conductive wall and a circuit board at least partially disposed within the case. At least one electronic component is mounted on the circuit board and a temperature sensor is mounted on the circuit board. At least one thermally conductive protrusion extends from the wall and is thermally coupled to the temperature sensor.Type: GrantFiled: February 6, 2012Date of Patent: August 28, 2012Assignee: Finisar CorporationInventors: Lucy G. Hosking, Ricardo Enrique Saad, Jingcheng Zhang, Jiashu Chen, Donald A. Ice
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Patent number: 8200500Abstract: Generic and specific C-to-E binaural cue coding (BCC) schemes are described, including those in which one or more of the input channels are transmitted as unmodified channels that are not downmixed at the BCC encoder and not upmixed at the BCC decoder. The specific BCC schemes described include 5-to-2, 6-to-5, 7-to-5, 6.1-to-5.1, 7.1-to-5.1, and 6.2-to-5.1, where “0.1” indicates a single low-frequency effects (LFE) channel and “0.2” indicates two LFE channels.Type: GrantFiled: March 14, 2011Date of Patent: June 12, 2012Assignee: Agere Systems Inc.Inventors: Frank Baumgarte, Jiashu Chen, Christof Faller
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Publication number: 20120134387Abstract: A communications device with integrated case temperature measurement includes a case having at least one thermally conductive wall and a circuit board at least partially disposed within the case. At least one electronic component is mounted on the circuit board and a temperature sensor is mounted on the circuit board. At least one thermally conductive protrusion extends from the wall and is thermally coupled to the temperature sensor.Type: ApplicationFiled: February 6, 2012Publication date: May 31, 2012Inventors: Lucy G. Hosking, Ricardo Enrique Saad, Jingcheng Zhang, Jiashu Chen, Donald A. Ice
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Patent number: 8128283Abstract: The case temperature measurement device for an optoelectronic transceiver includes a case with at least one thermally conductive wall, at least one optical component at least partially disposed within the case, circuitry electrically coupled to the optical component. The circuitry includes a temperature sensor coupled to the circuitry. The case temperature measurement device also includes at least one protrusion formed on the wall of the case of the optoelectronic transceiver. The protrusion is thermally coupled to temperature sensor via a thermal pad. A method for estimating case temperature of the optoelectronic transceiver based on an internal temperature measurement and knowledge of the relationship between the measured internal temperature and the actual case temperature, and compensating for the effects of variable heat sources within the transceiver upon this estimate.Type: GrantFiled: September 29, 2008Date of Patent: March 6, 2012Assignee: Finisar CorporationInventors: Lucy G. Hosking, Ricardo Enrique Saad, Jingcheng Zhang, Jiashu Chen, Donald A. Ice
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Patent number: 7975493Abstract: Systems and methods for controlling a thermoelectric cooler (TEC) in an optical transceiver. A TEC system includes a processor that interacts with a power supply and a TEC controller to prevent inrush current. The power supply is switched by the processor and turned on only at a particular time. The power supply has a relatively large time constant such that it ramps slowly to its full value. In the meantime, the processor and TEC controller cause the temperature to ramp to a target value by repeatedly incrementing or decrementing a target value over time and by controlling when the maximum available voltage can be applied to the TEC.Type: GrantFiled: February 12, 2007Date of Patent: July 12, 2011Assignee: Finisar CorporationInventors: Ricardo Saad, Jiashu Chen, Saied Ansari
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Publication number: 20110164756Abstract: Generic and specific C-to-E binaural cue coding (BCC) schemes are described, including those in which one or more of the input channels are transmitted as unmodified channels that are not downmixed at the BCC encoder and not upmixed at the BCC decoder. The specific BCC schemes described include 5-to-2, 6-to-5, 7-to-5, 6.1-to-5.1, 7.1-to-5.1, and 6.2-to-5.1, where “.1” indicates a single low-frequency effects (LFE) channel and “.2” indicates two LFE channels.Type: ApplicationFiled: March 14, 2011Publication date: July 7, 2011Applicant: AGERE SYSTEMS INC.Inventors: Frank Baumgarte, Jiashu Chen, Christof Faller
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Patent number: 7941320Abstract: Generic and specific C-to-E binaural cue coding (BCC) schemes are described, including those in which one or more of the input channels are transmitted as unmodified channels that are not downmixed at the BCC encoder and not upmixed at the BCC decoder. The specific BCC schemes described include 5-to-2, 6-to-5, 7-to-5, 6.1-to-5.1, 7.1-to-5.1, and 6.2-to-5.1, where “0.1” indicates a single low-frequency effects (LFE) channel and “0.2” indicates two LFE channels.Type: GrantFiled: August 27, 2009Date of Patent: May 10, 2011Assignee: Agere Systems, Inc.Inventors: Frank Baumgarte, Jiashu Chen, Christof Faller
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Patent number: 7912225Abstract: 3D sound is generated using an improved HRTF modeling technique for synthesizing HRTFs with varying degrees of smoothness and generalization. A plurality N of spatial characteristic function sets are regularized or smoothed before combination with corresponding Eigen filter functions, and summed to provide an HRTF (or HRIR) filter having improved smoothness in a continuous auditory space. A trade-off is allowed between accuracy in localization and smoothness by controlling the smoothness level of the regularizing models with a lambda factor. Improved smoothness in the HRTF filter allows the perception by the listener of a smoothly moving sound rendering free of annoying discontinuities creating clicks in the 3D sound.Type: GrantFiled: June 7, 2006Date of Patent: March 22, 2011Assignee: Agere Systems Inc.Inventor: Jiashu Chen
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Patent number: 7809275Abstract: This disclosure concerns transceivers that include CDR bypass functionality. In one example, a 10 G XFP transceiver module includes integrated CDR functionality for reducing jitter. The 10 G XFP transceiver module also implements CDR bypass functionality so that the CDR can be bypassed at rate less than about 10 Gb/s, such as the Fibre Channel 8.5 Gb/s rate for example.Type: GrantFiled: March 7, 2005Date of Patent: October 5, 2010Assignee: Finisar CorporationInventors: Lewis B. Aronson, Thomas Gordon Beck Mason, Yuxin Zhou, Huy Anh Vu, Giorgio Giaretta, Jiashu Chen
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Patent number: 7644003Abstract: Generic and specific C-to-E binaural cue coding (BCC) schemes are described, including those in which one or more of the input channels are transmitted as unmodified channels that are not downmixed at the BCC encoder and not upmixed at the BCC decoder. The specific BCC schemes described include 5-to-2, 6-to-5, 7-to-5, 6.1-to-5.1, 7.1-to-5.1, and 6.2-to-5.1, where “0.1” indicates a single low-frequency effects (LFE) channel and “0.2” indicates two LFE channels.Type: GrantFiled: September 8, 2004Date of Patent: January 5, 2010Assignee: Agere Systems Inc.Inventors: Frank Baumgarte, Jiashu Chen, Christof Faller
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Publication number: 20090319281Abstract: Generic and specific C-to-E binaural cue coding (BCC) schemes are described, including those in which one or more of the input channels are transmitted as unmodified channels that are not downmixed at the BCC encoder and not upmixed at the BCC decoder. The specific BCC schemes described include 5-to-2, 6-to-5, 7-to-5, 6.1-to-5.1, 7.1-to-5.1, and 6.2-to-5.1, where “0.1” indicates a single low-frequency effects (LFE) channel and “0.2” indicates two LFE channels.Type: ApplicationFiled: August 27, 2009Publication date: December 24, 2009Applicant: AGERE SYSTEMS INC.Inventors: Frank Baumgarte, Jiashu Chen, Christof Faller
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Publication number: 20090097527Abstract: The case temperature measurement device for an optoelectronic transceiver includes a case with at least one thermally conductive wall, at least one optical component at least partially disposed within the case, circuitry electrically coupled to the optical component. The circuitry includes a temperature sensor coupled to the circuitry. The case temperature measurement device also includes at least one protrusion formed on the wall of the case of the optoelectronic transceiver. The protrusion is thermally coupled to temperature sensor via a thermal pad. A method for estimating case temperature of the optoelectronic transceiver based on an internal temperature measurement and knowledge of the relationship between the measured internal temperature and the actual case temperature, and compensating for the effects of variable heat sources within the transceiver upon this estimate.Type: ApplicationFiled: September 29, 2008Publication date: April 16, 2009Inventors: Lucy G. Hosking, Ricardo Enrique Saad, Jingcheng Zhang, Jiashu Chen, Donald A. Ice
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Publication number: 20080312170Abstract: The present invention relates to a fibrinolysin gene of Agkistrodon acutus, a vector containing the said gene and the host cell which transformed by the vector. The fibrinolysin could be used in treating diseases caused by thrombus. The fibrinolysin FII is purified from the crude venom of Agkistrodon acutus, and the corresponding gene is cloned. It is recommended to produce the fibrionolysin by the yeast expression system. The activity of the fibrionlysin is also determined. The advantages of this invention are that the expression level and activity of the fibrinolysin are both high and the quality of the fibrinolysin is stable.Type: ApplicationFiled: December 15, 2004Publication date: December 18, 2008Inventors: Guangmei Yan, Jiashu Chen, Pengxin Qiu, Hong Shan
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Publication number: 20080047278Abstract: Systems and methods for controlling a thermoelectric cooler (TEC) in an optical transceiver. A TEC system includes a processor that interacts with a power supply and a TEC controller to prevent inrush current. The power supply is switched by the processor and turned on only at a particular time. The power supply has a relatively large time constant such that it ramps slowly to its full value. In the meantime, the processor and TEC controller cause the temperature to ramp to a target value by repeatedly incrementing or decrementing a target value over time and by controlling when the maximum available voltage can be applied to the TEC.Type: ApplicationFiled: February 12, 2007Publication date: February 28, 2008Applicant: Finisar CorporationInventors: Ricardo Saad, Jiashu Chen, Saied Ansari
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Patent number: 7215782Abstract: In one embodiment, a sound image is generated by applying first and second copies of a first input audio signal to first and second audio channels, respectively, to generate first and second output audio signals for the sound image. Each output audio signal is generated by (1) applying the corresponding copy of the first input audio signal to a corresponding source placement unit (SPU) to generate M delayed, attenuated, and weighted audio signals, A>1; (2) applying each delayed, attenuated, and weighted audio signal to a corresponding eigen filter to generate one of M eigen-filtered audio signals; and (3) summing the M eigen-filtered audio signals to generate the corresponding output signal. In an alternative embodiment, M copies of a first input audio signal are eigen-filtered prior to applying first and second copies of the resulting eigen-filtered signals to first and second audio channels, respectively.Type: GrantFiled: January 23, 2006Date of Patent: May 8, 2007Assignee: Agere Systems Inc.Inventor: Jiashu Chen
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Patent number: 7174229Abstract: A high quality digital 3D sound rendering is implemented using high resolution interaural time delays formed from two delay lines: a first delay line providing a rough estimate of the desired interaural time delay for a particular audio sample, and a second delay line in series with the first delay line providing a more finely resolved fractional delay. In the disclosed embodiment, the first delay module, i.e., the integer delay module, is formed from a first-in, first-out (FIFO) buffer with appropriate selection control of a desired sample as it passes through the FIFO buffer with each clock cycle based on the sampling rate. The second delay module (i.e., the fractional delay module) is formed from a plurality of polyphase (FIR) filters. The number of polyphase filters is determined based on the desired resolution of the interaural time delay.Type: GrantFiled: November 13, 1998Date of Patent: February 6, 2007Assignee: Agere Systems Inc.Inventors: Jiashu Chen, Christopher Anton Wendt
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Publication number: 20060251276Abstract: 3D sound is generated using an improved HRTF modeling technique for synthesizing HRTFs with varying degrees of smoothness and generalization. A plurality N of spatial characteristic function sets are regularized or smoothed before combination with corresponding Eigen filter functions, and summed to provide an HRTF (or HRIR) filter having improved smoothness in a continuous auditory space. A trade-off is allowed between accuracy in localization and smoothness by controlling the smoothness level of the regularizing models with a lambda factor. Improved smoothness in the HRTF filter allows the perception by the listener of a smoothly moving sound rendering free of annoying discontinuities creating clicks in the 3D sound.Type: ApplicationFiled: June 7, 2006Publication date: November 9, 2006Inventor: Jiashu Chen
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Patent number: 7085393Abstract: The present invention provides an improved HRTF modeling technique for synthesizing HRTFs with varying degrees of smoothness and generalization. A plurality N of spatial characteristic function sets are regularized or smoothed before combination with corresponding Eigen filter functions, and summed to provide an HRTF (or HRIR) filter having improved smoothness in a continuous auditory space. A trade-off is allowed between accuracy in localization and smoothness by controlling the smoothness level of the regularizing models with a lambda factor. Improved smoothness in the HRTF filter allows the perception by the listener of a smoothly moving sound rendering free of annoying discontinuities creating clicks in the 3D sound.Type: GrantFiled: November 13, 1998Date of Patent: August 1, 2006Assignee: Agere Systems Inc.Inventor: Jiashu Chen