Patents by Inventor Liang-Hui Lee
Liang-Hui Lee 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: 8374294Abstract: An apparatus and an associated method for automatic gain control (AGC) are provided to improve the ability to lock effective signal power when interference exists, thereby upgrading the receiver performance of a communication system. The apparatus includes a variable-gain circuit for adjusting the power level of an input signal. The apparatus also includes a gain adjustment circuit and a target value adjustment circuit. The gain adjustment circuit is for adjusting the gain of the variable-gain circuit according to the adjusted input signal and a target value, while the target value adjustment is for dynamically adjusting the target value according to the strength of the adjusted input signal.Type: GrantFiled: July 16, 2007Date of Patent: February 12, 2013Assignee: Realtek Semiconductor Corp.Inventors: Chun Ming Cho, Liang Hui Lee
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Patent number: 7936849Abstract: The present invention discloses a decoding device. The decoding device includes a scaling unit for adjusting a received signal according to a scaling coefficient to generate a scaled signal; a quantizer coupled to the scaling unit for generating a quantized signal by quantizing the scaled signal; a soft decision decoder coupled to the quantizer for decoding the quantized signal to generate a decoded signal; and a scaling coefficient generating unit coupled to the scaling unit for generating the scaling coefficient according to a system information of the decoding device.Type: GrantFiled: March 6, 2007Date of Patent: May 3, 2011Assignee: Realtek Semiconductor Corp.Inventors: Chun-Ming Cho, Cheng-Kang Wang, Liang-Hui Lee, Kuang-Yu Yen
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Patent number: 7599010Abstract: The present invention provides a TV receiver and an analog TV signal processing method. The TV receiver includes a tuner, an analog-to-digital converter, and a digital filter module. The tuner is utilized to receive an RF signal and generate a first signal; the analog-to-digital converter is coupled to the tuner for converting the first signal to a digital signal, and the digital filter module is coupled to the analog-to-digital converter for filtering the digital signal in order to filter an analog TV signal contained in the RF signal in digital domain.Type: GrantFiled: May 5, 2005Date of Patent: October 6, 2009Assignees: Realtek Semiconductor Corp., Orion Microelectronics CorporationInventors: Kuang-Yu Yen, Liang-Hui Lee, Jackie K. Cheng, Thomas Francis Baker, Kuangyu Li
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Publication number: 20080013655Abstract: An apparatus and an associated method for automatic gain control (AGC) are provided to improve the ability to lock effective signal power when interference exists, thereby upgrading the receiver performance of a communication system. The apparatus includes a variable-gain circuit for adjusting the power level of an input signal. The apparatus also includes a gain adjustment circuit and a target value adjustment circuit. The gain adjustment circuit is for adjusting the gain of the variable-gain circuit according to the adjusted input signal and a target value, while the target value adjustment is for dynamically adjusting the target value according to the strength of the adjusted input signal.Type: ApplicationFiled: July 16, 2007Publication date: January 17, 2008Applicant: REALTEK SEMICONDUCTOR CORP.Inventors: Chun Ming CHO, Liang Hui LEE
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Publication number: 20070236370Abstract: The present invention discloses a decoding device. The decoding device includes a scaling unit for adjusting a received signal according to a scaling coefficient to generate a scaled signal; a quantizer coupled to the scaling unit for generating a quantized signal by quantizing the scaled signal; a soft decision decoder coupled to the quantizer for decoding the quantized signal to generate a decoded signal; and a scaling coefficient generating unit coupled to the scaling unit for generating the scaling coefficient according to a system information of the decoding device.Type: ApplicationFiled: March 6, 2007Publication date: October 11, 2007Inventors: Chun-Ming Cho, Cheng-Kang WANG, Liang-Hui LEE, Kuang-Yu Yen
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Patent number: 7202916Abstract: A television (TV) tuner includes a first mixer having an input terminal coupled to a received RF signal for producing an intermediate frequency signal, a notch filter having an input terminal coupled to the intermediate frequency signal for removing a first range of signals centered at a first center frequency in the intermediate frequency signal, a band-pass filter having an input terminal coupled to the intermediate frequency signal for passing a second range of signals centered at a second center frequency in the intermediate frequency signal, and a second mixer having inputs coupled to a filtered intermediate frequency signal for producing a first output signal. The filtered intermediate frequency signal is received from an output of the notch filter and the band-pass filter.Type: GrantFiled: December 15, 2003Date of Patent: April 10, 2007Assignee: Realtek Semiconductor Corp.Inventors: Tung-Ming Su, Dsun-Chie Twu, Liang-Hui Lee
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Patent number: 7120413Abstract: A television (TV) tuner includes a first mixer for mixing a received RF signal with a first local oscillator signal to produce an intermediate frequency signal, a second mixer for mixing the intermediate frequency signal with a second local oscillator signal for producing an in-phase baseband output signal, a third mixer for mixing the intermediate frequency signal with a third local oscillator signal for producing a quadrature-phase baseband output signal, the third local oscillator signal being the second local oscillator signal phase delayed, and a single phase locked loop (PLL) coupled to the first mixer and the second mixer unit for generating the first local oscillator signal and the second local oscillator signal according to a selected channel in the received RF signal.Type: GrantFiled: February 6, 2004Date of Patent: October 10, 2006Assignee: Realtek Semiconductor Corp.Inventors: Liang-Hui Lee, Dsun-Chie Twu, Tung-Ming Su
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Publication number: 20050254608Abstract: A method for antenna diversity includes: determining a first strength of the first antenna according to a received signal received by the first antenna; receiving the guard interval of a first symbol or a second symbol or both using the second antenna and determining a second strength of the second antenna; and determining which one of the first and the second antennas to receive the useful duration of the second symbol according to the first and the second strengths.Type: ApplicationFiled: May 4, 2005Publication date: November 17, 2005Inventors: Liang-Hui Lee, Chun-Ming Cho, Kuang-Yu Yen
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Publication number: 20050248689Abstract: The present invention provides a TV receiver and an analog TV signal processing method. The TV receiver includes a tuner, an analog-to-digital converter, and a digital filter module. The tuner is utilized to receive an RF signal and generate a first signal; the analog-to-digital converter is coupled to the tuner for converting the first signal to a digital signal, and the digital filter module is coupled to the analog-to-digital converter for filtering the digital signal in order to filter an analog TV signal contained in the RF signal in digital domain.Type: ApplicationFiled: May 5, 2005Publication date: November 10, 2005Inventors: Kuang-Yu Yen, Liang-Hui LEE, Jackie K. Cheng, Thomas Francis Baker, Kuangyu Li
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Publication number: 20050128363Abstract: A television (TV) tuner includes a first mixer having an input terminal coupled to a received RF signal for producing an intermediate frequency signal, a notch filter having an input terminal coupled to the intermediate frequency signal for removing a first range of signals centered at a first center frequency in the intermediate frequency signal, a band-pass filter having an input terminal coupled to the intermediate frequency signal for passing a second range of signals centered at a second center frequency in the intermediate frequency signal, and a second mixer having inputs coupled to a filtered intermediate frequency signal for producing a first output signal. The filtered intermediate frequency signal is received from an output of the notch filter and the band-pass filter.Type: ApplicationFiled: December 15, 2003Publication date: June 16, 2005Inventors: Tung-Ming Su, Dsun-Chie Twu, Liang-Hui Lee
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Publication number: 20050001937Abstract: A television (TV) tuner includes a first mixer for mixing a received RF signal with a first local oscillator signal to produce an intermediate frequency signal, a second mixer for mixing the intermediate frequency signal with a second local oscillator signal for producing an in-phase baseband output signal, a third mixer for mixing the intermediate frequency signal with a third local oscillator signal for producing a quadrature-phase baseband output signal, the third local oscillator signal being the second local oscillator signal phase delayed, and a single phase locked loop (PLL) coupled to the first mixer and the second mixer unit for generating the first local oscillator signal and the second local oscillator signal according to a selected channel in the received RF signal.Type: ApplicationFiled: February 6, 2004Publication date: January 6, 2005Inventors: Liang-Hui Lee, Dsun-Chie Twu, Tung-Ming Su