Patents by Inventor Yuh Cheng
Yuh Cheng 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: 8906339Abstract: The invention provides a high module carbon fiber and a fabrication method thereof. The high module carbon fiber includes the product fabricated by the following steps: subjecting a pre-oxidized carbon fiber to a microwave assisted graphitization process, wherein the pre-oxidized carbon fiber is heated to a graphitization temperature of 1000-3000° C. for 1-30 min. Further, the high module carbon fiber has a tensile strength of between 2.0-6.5 GPa and a module of between 200-650 GPa.Type: GrantFiled: May 29, 2010Date of Patent: December 9, 2014Assignee: Industrial Technology Research InstituteInventors: Chih-Yung Wang, I-Wen Liu, Jong-Pyng Chen, Shu-Hui Cheng, Syh-Yuh Cheng
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Patent number: 8803183Abstract: An LED heat-conducting substrate and its thermal module wherein the composite heat-conducting substrate is incorporated by multiple heat-conducting wires or fibers and insulating material. Said wires or fibers are arranged at interval, and penetrate the front and rear faces. The wires or fibers are segregated by insulating material. An electrode pad is incorporated onto the front face of the composite heat-conducting substrate, and is electrically connected with the electrode pin of LED unit. A heat-conducting pad is incorporated and kept in contact with the heat sink of the LED component for heat conduction. An insulating layer is incorporated onto the rear face of the composite heat-conducting substrate, and located correspondingly to the electrode pad. The LED heat-conducting substrate and thermal module can be constructed easily for high heat conduction in the thickness direction and high electrical insulation in the direction of plane, enabling quick heat transfer to the heat-sinking component.Type: GrantFiled: October 13, 2010Date of Patent: August 12, 2014Assignee: Ho Cheng Industrial Co., Ltd.Inventors: Yi-Shun Chang, Syh-Yuh Cheng
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Publication number: 20130166924Abstract: A method for performing scenario driven voltage scaling of a system includes: monitoring at least one condition of the system, wherein the at least one condition includes user scenario switching of the system; and based upon at least one predetermined table, determining at least one level of at least one voltage for driving the system according to the at least one condition, where the predetermined table includes a plurality of sets of frequency/voltage information respectively corresponding to a plurality of scenarios. An associated apparatus for performing scenario driven voltage scaling of the system is also provided. The apparatus includes at least one tracking module capable of monitoring the at least one condition of the system, and further includes at least one voltage control module capable of determining the at least one level of the at least one voltage.Type: ApplicationFiled: December 21, 2011Publication date: June 27, 2013Inventors: Jen-Chieh Yang, Yuh Cheng, Kun-Bin Lee, Haw-Kuen Su
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Patent number: 8369199Abstract: A method for tuning a write strategy parameter of an optical storage device, includes: writing a segment of data according to a plurality of write strategies; reading the data back and detecting a plurality of lengths, each length corresponding to a pit or a land on an optical storage medium accessed by the optical storage device; performing calculations according to the lengths and a plurality of data types to generate a plurality of calculation results, each of the data types corresponding to at least a specific target pit length or at least a specific target land length; and utilizing the calculation results to determine a proper write strategy.Type: GrantFiled: July 4, 2007Date of Patent: February 5, 2013Assignee: Mediatek Inc.Inventors: Chih-Ching Yu, Pi-Hai Liu, Yuh Cheng
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Patent number: 8270266Abstract: A device for detecting wobbles on an optical disc is provided, where the device is utilized for generating a wobble signal according to a plurality of detection signals. The device includes an analog signal processing circuit, a pair of analog-to-digital converters (ADCs), and a digital signal processing circuit. The analog signal processing circuit is arranged to perform analog signal processing on the detection signals to generate a plurality of output signals. In addition, the pair of ADCs are arranged to digitalize the output signals to generate a plurality of digital values. Additionally, the digital signal processing circuit is arranged to perform digital signal processing on the digital values and generate an arithmetic output, where the arithmetic output is utilized for generating the wobble signal or utilized as the wobble signal. An associated method for detecting wobbles on an optical disc is further provided.Type: GrantFiled: January 22, 2009Date of Patent: September 18, 2012Assignee: Mediatek Inc.Inventors: Tzu-Chieh Lin, Yuh Cheng, Chih-Ching Chen, Tysh-Bin Liu, Yu-Hsuan Lin
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Publication number: 20120230524Abstract: A piezoelectric panel speaker has a frame, piezoelectric actuators and a vibrating diaphragm set into the hollow assembly space of the frame. Two corresponding sides of the diaphragm are fixed onto the actuator, and the other two corresponding sides are spaced with said frame. The actuator is fixed onto both sides of the diaphragm, high sound pressure is generated by the diaphragm through high deformation of the piezoelectric bimorph plates. The plates of the actuator could be driven independently by the driving voltage. This could reduce the resonance of the diaphragm through the phase of driving voltage. The diaphragm could generate smooth acoustic response. Two corresponding sides of the diaphragm spaced with said frame are linked to said frame via a flexible connector. This could reduce the clamping effect of the frame against the diaphragm, and avoid the reduction of sound pressure arising from amplitude limitation of the vibrating diaphragm.Type: ApplicationFiled: March 7, 2011Publication date: September 13, 2012Applicant: HO HSIN PROGRESSIVE TECHNOLOGY CO., LTD.Inventors: Yi-Shun CHANG, Syh-Yuh CHENG
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Patent number: 8163404Abstract: A chlorine, fluorine and lithium co-doped transparent conductive film is provided, including chlorine, fluorine and lithium co-doped tin oxides, wherein the chlorine, fluorine and lithium co-doped tin oxides have a chlorine ion doping concentration not greater than 5 atom %, a fluorine ion doping concentration not greater than 5 atom %, and a lithium ion doping concentration not greater than 5 atom %.Type: GrantFiled: October 29, 2008Date of Patent: April 24, 2012Assignee: Industrial Technology Research InstituteInventors: Syh-Yuh Cheng, Chia-Hsin Lin, Chin-Ching Lin, Mei-Ching Chiang
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Publication number: 20120092833Abstract: An LED heat-conducting substrate and its thermal module wherein the composite heat-conducting substrate is incorporated by multiple heat-conducting wires or fibers and insulating material. Said wires or fibers are arranged at interval, and penetrate the front and rear faces. The wires or fibers are segregated by insulating material. An electrode pad is incorporated onto the front face of the composite heat-conducting substrate, and is electrically connected with the electrode pin of LED unit. A heat-conducting pad is incorporated and kept in contact with the heat sink of the LED component for heat conduction. An insulating layer is incorporated onto the rear face of the composite heat-conducting substrate, and located correspondingly to the electrode pad. The LED heat-conducting substrate and thermal module can be constructed easily for high heat conduction in the thickness direction and high electrical insulation in the direction of plane, enabling quick heat transfer to the heat-sinking component.Type: ApplicationFiled: October 13, 2010Publication date: April 19, 2012Applicant: HO CHENG INDUSTRIAL CO., LTD.Inventors: Yi-Shun Chang, Syh-Yuh Cheng
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Patent number: 8107340Abstract: The invention provides an electronic apparatus. In one embodiment, the electronic apparatus comprises an analog-to-digital converter (ADC) and an enable device. The analog-to-digital converter converts an analog input signal to a digital output signal with a resolution having a plurality of bits. The enable device dynamically adjusts the resolution of the analog-to-digital converter according to an instruction signal.Type: GrantFiled: August 18, 2009Date of Patent: January 31, 2012Assignee: Mediatek Inc.Inventors: Yu-Hsuan Lin, Tzu-Chieh Lin, Yuh Cheng, Tysh-Bin Liu
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Publication number: 20110276988Abstract: An optical disc drive includes a housing, a disc tray, a connector, a spindle motor, an OPU, a motor drive, and a control circuit. The disc tray may slide into or out of the housing through its opening. The connector is installed on the housing for transmitting host signals to the disc tray. The control circuit is installed on the disc tray for processing the host signals, thereby operating the spindle motor and the OPU accordingly.Type: ApplicationFiled: April 21, 2011Publication date: November 10, 2011Inventors: Po-Hsiang Huang, Yuh Cheng, Hao-Hui Yin, Li-Chun Yang
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Publication number: 20110158895Abstract: The invention provides a high module carbon fiber and a fabrication method thereof. The high module carbon fiber includes the product fabricated by the following steps: subjecting a pre-oxidized carbon fiber to a microwave assisted graphitization process, wherein the pre-oxidized carbon fiber is heated to a graphitization temperature of 1000-3000° C. for 1-30 min. Further, the high module carbon fiber has a tensile strength of between 2.0-6.5 GPa and a module of between 200-650 GPa.Type: ApplicationFiled: May 29, 2010Publication date: June 30, 2011Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Chih-Yung Wang, I-Wen Liu, Jong-Pyng Chen, Shu-Hui Cheng, Syh-Yuh Cheng
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Patent number: 7944784Abstract: A detector is scanned across an optical storage medium having groove tracks and land tracks, each track having a wobble structure, to detect light reflected from the optical storage medium. A wobble signal and a tracking error signal are generated based on an output of the detector, and the wobble signal is sampled according to the tracking error signal. A determination about whether the detector is at the groove track or the land track is made based on the tracking error signal and a comparison of sampled values of the wobble signal.Type: GrantFiled: March 3, 2010Date of Patent: May 17, 2011Assignee: MediaTek Inc.Inventors: Gwo-Huei Wu, Yuh Cheng, Chao-Ming Huang, Chih-Yuan Chen, Ching-Ning Chiu
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Publication number: 20110110205Abstract: The invention provides an apparatus for controlling servo signal gains of an optical disc drive. The apparatus adjusts the gains of a plurality of servo signals controlling a servo system of the optical disc drive when the optical disk drive encounters an operating state transition. In a first mode, at least one AGC loop of the apparatus compensates the gains of the servo signals with a selectable bandwidth during a specific period after the operating state transition to accelerate the convergence of the servo signals. In a second mode, at least one AGC loop of the apparatus reloads the previously saved convergence values or pre-determined values as the initial values according to the current operating state immediately after the operating state transition to accelerate the convergence of the servo signals.Type: ApplicationFiled: January 19, 2011Publication date: May 12, 2011Applicant: MEDIATEK INC.Inventors: Chia-Wei Liao, Chih-Ching Chen, Yuh Cheng, Ming-Jiou Yu, Kuo-Jung Lan, Chun-Yu Lin, Shu-Hung Chou
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Publication number: 20110090773Abstract: An apparatus for generating Viterbi-processed data using an input signal obtained from reading an optical disc includes a Viterbi decoding unit and a control circuit. The Viterbi decoding unit is arranged to process the input signal and generate the Viterbi-processed data. In addition, the control circuit is arranged to control at least one component of the apparatus based upon at least one signal within the apparatus. Additionally, the component includes a phase locked loop (PLL) processing unit, an equalizer, and/or the Viterbi decoding unit. An associated apparatus including an equalizer and a Viterbi module is further provided. An associated apparatus including a Viterbi decoding unit and a control circuit is also provided. An associated apparatus including an equalizer, at least one offset/gain controller, and a Viterbi module is further provided. An associated apparatus including an equalizer, a Viterbi module, and a peak/bottom/central (PK/BM/DC) detector is also provided.Type: ApplicationFiled: August 10, 2010Publication date: April 21, 2011Inventors: Chih-Ching Yu, Pi-Hai Liu, Yu-Hsuan Lin, Ying-Feng Huang, Yuh Cheng, Jin-Bin Yang
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Patent number: 7911891Abstract: The invention provides an apparatus for controlling servo signal gains of an optical disc drive. The apparatus adjusts the gains of a plurality of servo signals controlling a servo system of the optical disc drive according to a closed-loop mode or a state-reloading mode whenever the optical disk drive encounters an operating state transition. In closed-loop mode, at least one AGC loop of the apparatus compensates the gains of the servo signals with a selectable bandwidth during a specific period after the operating state transition to accelerate the convergence of the servo signals. In state-reloading mode, at least one AGC loop of the apparatus reloads the previously saved convergence values or pre-determined values as the initial values according to the current operating state immediately after the operating state transition to accelerate the convergence of the servo signals.Type: GrantFiled: June 5, 2007Date of Patent: March 22, 2011Assignee: Mediatek Inc.Inventors: Chia-Wei Liao, Chih-Ching Chen, Yuh Cheng, Ming-Jiou Yu, Kuo-Jung Lan, Chun-Yu Lin, Shu-Hung Chou
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Publication number: 20110044145Abstract: The invention provides an electronic apparatus. In one embodiment, the electronic apparatus comprises an analog-to-digital converter (ADC) and an enable device. The analog-to-digital converter converts an analog input signal to a digital output signal with a resolution having a plurality of bits. The enable device dynamically adjusts the resolution of the analog-to-digital converter according to an instruction signal.Type: ApplicationFiled: August 18, 2009Publication date: February 24, 2011Applicant: MEDIATEK INC.Inventors: Yu-Hsuan Lin, Tzu-Chieh Lin, Yuh Cheng, Tysh-Bin Liu
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Patent number: 7804746Abstract: A detector is scanned across an optical storage medium having groove tracks and land tracks, each track having a wobble structure, to detect light reflected from the optical storage medium. A wobble signal and a tracking error signal are generated based on an output of the detector, and the wobble signal is sampled according to the tracking error signal. A determination about whether the detector is at the groove track or the land track is made based on the tracking error signal and a comparison of sampled values of the wobble signal.Type: GrantFiled: March 11, 2005Date of Patent: September 28, 2010Assignee: MediaTek Inc.Inventors: Gwo-Huei Wu, Yuh Cheng, Chao-Ming Huang, Chih-Yuan Chen, Ching-Ning Chiu
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Patent number: 7796480Abstract: An apparatus for light spot servo signal detection for reading an optical recording medium having a plurality of non-writable areas between writable data areas containing address information. An optical pickup provides a light spot to the non-writable areas of the optical recording medium with a predetermined state according to a control signal, and detects optical reflecting signals from the optical recording medium to generate a detection signal. A signal adjusting module offsets signal levels of the detection signal to an operating range to generate an offset shifted detection signal. An analog to digital converter digitizes the offset shifted detection signal to generate a digital signal. A detection circuit detects the servo detection signal according to the digital signal.Type: GrantFiled: June 4, 2007Date of Patent: September 14, 2010Assignee: Mediatek Inc.Inventors: Yuh Cheng, Chih-Ching Chen, Chia-Wei Liao, Ming-Jiou Yu, Kuo-Jung Lan, Shu-Hung Chou, Yu-Hsuan Lin
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Patent number: 7773480Abstract: A device for processing a radio frequency (RF) signal of an optical disk drive includes a high-pass (HP) filter, an RF variable gain amplifier (VGA), an RF analog-digital converter (ADC), and a digital module. The HP filter filters the RF signal and is capable of selectively utilizing one of a first cut-off frequency and a second cut-off frequency. The RF VGA amplifies the filtered RF signal. The RF ADC converts the amplified RF signal into a digital code. The digital module is capable of executing a first function and a second function with the digital code. The HP filter utilizes the first cut-off frequency when the digital module desires to execute the first function, and the HP filter utilizes the second cut-off frequency when the digital module desires to execute the second function.Type: GrantFiled: February 8, 2008Date of Patent: August 10, 2010Assignee: Mediatek Inc.Inventors: Chih-Chien Huang, Chih-Ching Chen, Yuh Cheng, Chien Ming Chen
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Publication number: 20100157783Abstract: A detector is scanned across an optical storage medium having groove tracks and land tracks, each track having a wobble structure, to detect light reflected from the optical storage medium. A wobble signal and a tracking error signal are generated based on an output of the detector, and the wobble signal is sampled according to the tracking error signal. A determination about whether the detector is at the groove track or the land track is made based on the tracking error signal and a comparison of sampled values of the wobble signal.Type: ApplicationFiled: March 3, 2010Publication date: June 24, 2010Applicant: MEDIATEK, INC.Inventors: Gwo-Huei Wu, Yuh Cheng, Chao-Ming Huang, Chih-Yuan Chen, Ching-Ning Chiu