Patents by Inventor CHING FU LAN
CHING FU LAN 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: 9883227Abstract: A television signal processing circuit includes an audio/video (AV) signal generating circuit, an intermediate frequency (IF) mixer, a first filter, a radio-frequency (RF) mixer, a second filter and a digital-to-analog converter (DAC). The AV signal generator generates a digital AV signal. The IF mixer converts the digital AV signal to an IF AV signal. The first filter filters the IF AV signal to generate a filtered IF AV signal. The RF mixer converts the filtered IF AV signal to an RF AV signal. The second filter filters the RF AV signal to generate a filtered RF AV signal. The DAC converts the filtered RF AV signal to an analog AV signal and transmits the analog AV signal to an antenna.Type: GrantFiled: March 15, 2017Date of Patent: January 30, 2018Assignee: MSTAR SEMICONDUCTOR, INC.Inventors: Ching-Fu Lan, Ying-Chao Chou, Chih-Ching Chao, Huang-Hsiang Lin, Jung-Kuei Chang
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Publication number: 20180027277Abstract: A television signal processing circuit includes an audio/video (AV) signal generating circuit, an intermediate frequency (IF) mixer, a first filter, a radio-frequency (RF) mixer, a second filter and a digital-to-analog converter (DAC). The AV signal generator generates a digital AV signal. The IF mixer converts the digital AV signal to an IF AV signal. The first filter filters the IF AV signal to generate a filtered IF AV signal. The RF mixer converts the filtered IF AV signal to an RF AV signal. The second filter filters the RF AV signal to generate a filtered RF AV signal. The DAC converts the filtered RF AV signal to an analog AV signal and transmits the analog AV signal to an antenna.Type: ApplicationFiled: March 15, 2017Publication date: January 25, 2018Inventors: Ching-Fu Lan, Ying-Chao Chou, Chih-Ching Chao, HUANG-HSIANG LIN, JUNG-KUEI CHANG
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Patent number: 9673935Abstract: By inserting a symbol start tag at a start of a data segment corresponding to each symbol of a multimedia data stream, and by inserting frame start tags at starts of different frames in a start data segment, data signals belonging to different channels can be precisely and rapidly classified and decoded when the multimedia data stream is performed with demodulation.Type: GrantFiled: December 23, 2013Date of Patent: June 6, 2017Assignee: MStar Semiconductor, Inc.Inventors: You-Tsai Jeng, Tai-Lai Tung, Tung-Sheng Lin, Ching-Fu Lan
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Patent number: 9647860Abstract: By determining a scaling factor for scaling signals according to a signal having low bit error rates, and by adjusting soft data using the scaling factor, when soft data are simulated using the Gaussian Model having obvious errors with respect to reality, impacts of signals having low bit error rates are effectively amplified so that impacts of signals having high bit error rates are effectively reduced on the contrary. As a result, the obvious errors introduced by using the Gaussian Model and a low broadcast quality of digital television signals caused by said obvious errors can be neutralized.Type: GrantFiled: December 26, 2013Date of Patent: May 9, 2017Assignee: MSTAR SEMICONDUCTOR, INC.Inventors: You-Tsai Jeng, Tai-Lai Tung, Tung-Sheng Lin, Ching-Fu Lan
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Patent number: 9148309Abstract: An apparatus for estimating channel effects is provided. A receiving module receives first data and first reference information arriving in a first time period, second data and second reference data arriving in a second time period, and third data and third reference data arriving in a third time period. An estimation module estimates channel effects corresponding to the first and third data, and the first, second and third reference data, respectively. A coefficient calculation module performs a Wiener filter coefficient calculation on the channel effects corresponding to the first, second and third reference data to generate a set of time-domain interpolation coefficients. An interpolation module interpolates the channel effects corresponding to the first third data according to the set of time-domain interpolation coefficients to generate a channel effect corresponding to the second data.Type: GrantFiled: February 6, 2014Date of Patent: September 29, 2015Assignee: MSTAR SEMICONDUCTOR, INC.Inventors: Chun-Chi Su, Ching-Fu Lan, Chun-Chieh Wang, Tai-Lai Tung, Tung-Sheng Lin
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Patent number: 9094178Abstract: A correcting apparatus for timing recovery of a receiver is provided. The receiver includes a timing recovery module that outputs a first symbol and a second symbol. The correcting apparatus includes: a channel impulse response module, configured to generate a first set of peak times and a second set of peak times according to the first symbol and the second symbol, respectively; and a calculation module, configured to calculate a correction signal according to a relationship between the first and second sets of peak times and to send the correction signal to the timing recovery module.Type: GrantFiled: June 9, 2014Date of Patent: July 28, 2015Assignee: MSTAR SEMICONDUCTOR, INC.Inventors: Chih-Cheng Kuo, Ching-Fu Lan, Tai-Lai Tung
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Patent number: 9042494Abstract: A digital broadcasting receiving system is provided. A receiving module receives an M number of symbols each carrying an N number of subcarriers of a control signal. A converting module performs FFT on respective kth subcarriers of an ith symbol and an (i+1)th symbol to generate an (i, k)th converted value and an (i+1, k)th converted value. A demodulating module performs differential demodulation on the (i, k)th and (i+1, k)th converted values to generate an (i, k)th demodulation value. A combining module soft-combines the (i, 1)th demodulation value through the (i, N)th demodulation value to generate an ith prediction value corresponding to the ith symbol. A determining module identifies a synchronization segment in the control signal according to the 1st prediction value to the (M?1)th prediction value.Type: GrantFiled: March 7, 2014Date of Patent: May 26, 2015Assignee: MSTAR SEMICONDUCTOR, INC.Inventors: Ching-Fu Lan, Hsin-Chuan Kuo, Tung-Sheng Lin, Tai-Lai Tung
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Publication number: 20140362963Abstract: A correcting apparatus for timing recovery of a receiver is provided. The receiver includes a timing recovery module that outputs a first symbol and a second symbol. The correcting apparatus includes: a channel impulse response module, configured to generate a first set of peak times and a second set of peak times according to the first symbol and the second symbol, respectively; and a calculation module, configured to calculate a correction signal according to a relationship between the first and second sets of peak times and to send the correction signal to the timing recovery module.Type: ApplicationFiled: June 9, 2014Publication date: December 11, 2014Inventors: Chih-Cheng Kuo, Ching-Fu Lan, Tai-Lai Tung
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Publication number: 20140254652Abstract: A digital broadcasting receiving system is provided. A receiving module receives an M number of symbols each carrying an N number of subcarriers of a control signal. A converting module performs FFT on respective kth subcarriers of an ith symbol and an (i+1)th symbol to generate an (i, k)th converted value and an (i+1, k)th converted value. A demodulating module performs differential demodulation on the (i, k)th and (i+1, k)th converted values to generate an (i, k)th demodulation value. A combining module soft-combines the (i, 1)th demodulation value through the (i, N)th demodulation value to generate an ith prediction value corresponding to the ith symbol. A determining module identifies a synchronization segment in the control signal according to the 1st prediction value to the (M?1)th prediction value.Type: ApplicationFiled: March 7, 2014Publication date: September 11, 2014Applicant: MStar Semiconductor, Inc.Inventors: Ching-Fu Lan, Hsin-Chuan Kuo, Tung-Sheng Lin, Tai-Lai Tung
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Publication number: 20140219403Abstract: An apparatus for estimating channel effects is provided. A receiving module receives first data and first reference information arriving in a first time period, second data and second reference data arriving in a second time period, and third data and third reference data arriving in a third time period. An estimation module estimates channel effects corresponding to the first and third data, and the first, second and third reference data, respectively. A coefficient calculation module performs a Wiener filter coefficient calculation on the channel effects corresponding to the first, second and third reference data to generate a set of time-domain interpolation coefficients. An interpolation module interpolates the channel effects corresponding to the first third data according to the set of time-domain interpolation coefficients to generate a channel effect corresponding to the second data.Type: ApplicationFiled: February 6, 2014Publication date: August 7, 2014Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Chun-Chi Su, Ching-Fu Lan, Chun-Chieh Wang, Tai-Lai Tung, Tung-Sheng Lin
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Publication number: 20140204997Abstract: By determining a scaling factor for scaling signals according to a signal having low bit error rates, and by adjusting soft data using the scaling factor, when soft data are simulated using the Gaussian Model having obvious errors with respect to reality, impacts of signals having low bit error rates are effectively amplified so that impacts of signals having high bit error rates are effectively reduced on the contrary. As a result, the obvious errors introduced by using the Gaussian Model and a low broadcast quality of digital television signals caused by said obvious errors can be neutralized.Type: ApplicationFiled: December 26, 2013Publication date: July 24, 2014Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: YOU-TSAI JENG, Tai-Lai Tung, Tung-Sheng Lin, Ching-Fu Lan
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Publication number: 20140177732Abstract: By inserting a symbol start tag at a start of a data segment corresponding to each symbol of a multimedia data stream, and by inserting frame start tags at starts of different frames in a start data segment, data signals belonging to different channels can be precisely and rapidly classified and decoded when the multimedia data stream is performed with demodulation.Type: ApplicationFiled: December 23, 2013Publication date: June 26, 2014Applicant: Star Semiconductor, Inc.Inventors: You-Tsai JENG, Tai-Lai TUNG, Tung-Sheng LIN, Ching-Fu LAN
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Patent number: 8525937Abstract: An apparatus for calibrating an audio-visual (AV) signal includes a controller for generating a control signal, a controllable filter for selectively filtering the AV signal in response to the control signal to output either the AV signal or a filtered AV signal; and a calibrator for generating a group of calibrating coefficients according to the filtered AV signal and calibrating the AV signal according to the group of calibrating coefficients.Type: GrantFiled: August 24, 2011Date of Patent: September 3, 2013Assignee: MStar Semiconductor, Inc.Inventors: Wen Chieh Yang, Ching Fu Lan, Jen Hsing Wang, Yi Hsuan Lai, Chin Fu Ho, Hsin Chuan Kuo, You Tsai Cheng, Tai Lai Tung
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Analog TV signal receiving circuit for reducing signal distortion using equalizer configuring method
Patent number: 8525932Abstract: An analog television (TV) signal receiving circuit and method and an associated equalizer coefficient configuration apparatus and method are disclosed for correcting a distortion problem occurred in a reception process of an analog TV signal by configuring an equalizer in the analog TV signal receiving circuit. The analog TV signal receiving TV includes a tuner, an analog-to-digital converter (ADC), and a demodulator. The tuner receives an analog radio-frequency (RF) TV signal to generate an analog frequency down conversion signal. The ADC generates a digital frequency down conversion signal according to the analog frequency down conversion signal. The demodulator includes a front-end circuit for generating a digital demodulated signal according to the digital frequency down conversion signal, and an equalizer for generating a digital receiving signal according to the digital demodulated signal. The equalizer includes a plurality of correction coefficients that are generated according to a predetermined rule.Type: GrantFiled: August 24, 2011Date of Patent: September 3, 2013Assignee: MStar Semiconductor, Inc.Inventors: Ching Fu Lan, Wen Chieh Yang, Yi Hsuan Lai, Hsin Chuan Kuo, You Tsai Cheng, Chin Fu Ho, Jen Hsing Wang, Tai Lai Tung -
Publication number: 20120218420Abstract: An apparatus for calibrating an audio-visual (AV) signal includes a controller for generating a control signal, a controllable filter for selectively filtering the AV signal in response to the control signal to output either the AV signal or a filtered AV signal; and a calibrator for generating a group of calibrating coefficients according to the filtered AV signal and calibrating the AV signal according to the group of calibrating coefficients.Type: ApplicationFiled: August 24, 2011Publication date: August 30, 2012Applicant: MStar Semiconductor, Inc.Inventors: Wen Chieh Yang, Ching Fu Lan, Jen Hsing Wang, Yi Hsuan Lai, Chin Fu Ho, Hsin Chuan Kuo, You-Tsai Cheng, Tai Lai Tung
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Analog TV Signal Receiving Circuit For Reducing Signal Distortion Using Equalizer Configuring Method
Publication number: 20120212674Abstract: An analog television (TV) signal receiving circuit and method and an associated equalizer coefficient configuration apparatus and method are disclosed for correcting a distortion problem occurred in a reception process of an analog TV signal by configuring an equalizer in the analog TV signal receiving circuit. The analog TV signal receiving TV includes a tuner, an analog-to-digital converter (ADC), and a demodulator. The tuner receives an analog radio-frequency (RF) TV signal to generate an analog frequency down conversion signal. The ADC generates a digital frequency down conversion signal according to the analog frequency down conversion signal. The demodulator includes a front-end circuit for generating a digital demodulated signal according to the digital frequency down conversion signal, and an equalizer for generating a digital receiving signal according to the digital demodulated signal. The equalizer includes a plurality of correction coefficients that are generated according to a predetermined rule.Type: ApplicationFiled: August 24, 2011Publication date: August 23, 2012Applicant: MStar Semiconductor, Inc.Inventors: CHING FU LAN, Wen Chieh Yang, Yi Hsuan Lai, Hsin Chuan Kuo, You-Tsai Cheng, Chin Fu Ho, Jen Hsing Wang, Tai Lai Tung