Patents by Inventor Wei-Ting Wang
Wei-Ting Wang 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: 20090296803Abstract: A block-based equalizer used in a receiver, comprising a feed forward filter, a feed backward filter and a combiner. The feed forward filter generates one first data block for each round and each first data block has multiple first sub-blocks. The feed backward filter generates one second data block. Certain input symbols of the feed backward filter are suppressed during filtering. The combiner combines one second data block and one first sub-block.Type: ApplicationFiled: June 3, 2008Publication date: December 3, 2009Applicant: MEDIATEK INC.Inventors: Wei-Ting WANG, Ming-Luen LIOU
-
Publication number: 20090268799Abstract: An equalization system used in a communication receiver has multiple equalization stages. A front equalizer supplies equalization output to a feed back filter in a rear equalizer to speed initialization of the rear equalizer. In addition, the rear equalizer supplies decision output to the front equalizer to estimate errors so as to provide more accurate tap coefficient adjustments. Both the front equalizer and the rear equalizer can be implemented with iterative equalizers to further enhance equalization performance.Type: ApplicationFiled: April 23, 2008Publication date: October 29, 2009Applicant: MEDIATEK INC.Inventors: Wei-Ting Wang, Ming-Luen Liou
-
Patent number: 7554609Abstract: A method and apparatus for rejecting an interference signal from an input frequency spectrum. The method includes the steps of receiving the input signal; frequency-shifting the received input signal by a first frequency-shifting amount; and filtering the frequency-shifted input signal to filter out the interference component from the input signal.Type: GrantFiled: January 27, 2005Date of Patent: June 30, 2009Assignee: Realtek Semiconductor Corp.Inventors: Wei-Ting Wang, Cheng-Yi Huang, Bao-Chi Peng
-
Publication number: 20090160870Abstract: The present invention discloses a texture filtering system, comprising a sequence generator, a retrieve unit and a dispatch unit. The sequence generator generates an execution sequence in each duty cycle. The execution sequence is the priority of respectively retrieving multiple pixels from multiple queues. The retrieve unit outputs multiple Boolean signals based on the limitation of the total number of all-purpose texture filters and the above priority in a duty cycle for determining from which queues the pixels are retrieved to perform a texture filtering process, and the dispatch unit assigns the multiple texture filter formats of the pixels to be processed and the anisotropic ratios thereof to multiple address generators.Type: ApplicationFiled: December 12, 2008Publication date: June 25, 2009Inventors: Wei-Ting WANG, Hui-Chin YANG, R-Ming HSU, Chung-Ping CHUNG
-
Patent number: 7460147Abstract: An interference detecting circuit for use in an ATSC system and for detecting interference of an ATSC signal includes: a buffering module for delaying to output a first PN63 synchronization format data when receiving the first PN63 synchronization format data; a correlation arithmetic circuit coupled to the buffering module for receiving the ATSC signal and performing a correlation operation on a second PN63 synchronization format data and the delayed first PN63 synchronization format data to output a detection signal when receiving the second PN63 synchronization format data; and a determining circuit for determining whether performing interference rejection on the ATSC signal or not according to the result of the above-mentioned correlation operation.Type: GrantFiled: June 28, 2005Date of Patent: December 2, 2008Assignee: Realtek Semiconductor Corp.Inventors: Wei-Ting Wang, Cheng-Yi Huang, Bao-Chi Peng
-
Patent number: 7460174Abstract: A synchronization signal detector includes: a first circuit configured to delay the data signal by a period of at least one data segment of the data signal to generate a delayed signal; a second circuit configured to produce a plurality of similarity signals according to the data signal and the delayed signal, each of the similarity signals representing the similarity between the data signal and the delayed signal, and a third circuit configured to determine the synchronization signal of the data signal according to the similarity signals. The present invention further provides a method corresponding to the signal detector.Type: GrantFiled: June 29, 2005Date of Patent: December 2, 2008Assignee: Realtek Semiconductor Corp.Inventors: Wei-Ting Wang, Cheng-Yi Huang, Bao-Chi Peng
-
Publication number: 20080285693Abstract: An amplitude-modulation signal reception apparatus is provided. The amplitude-modulation signal receiver apparatus includes a timing recovery module, a symbol phase shift unit, and an equalizer. The carrier recovery module removes a frequency offset and a phase jitter from an amplitude-modulation signal to generate a carrier recovered signal. The timing recovery module estimates a proper re-sampling position to re-sample the carrier-recovered signal. The phase shifter further shifts the signal that is timing recovered and carrier recovered. The equalizer applies equalization to the shifted signal to remove inter-symbol interference from the shifted signal.Type: ApplicationFiled: May 18, 2007Publication date: November 20, 2008Applicant: MEDIATEK INC.Inventors: Wei-Ting Wang, Yih-Ming Tsuie
-
Publication number: 20080260017Abstract: An equalizer. The equalizer, either operated in a blind mode or a decision directed mode, comprises a feed-forward filter, a feedback filter, a decision device, a control circuit, and a multiplexer. The feed-forward filter receives an input signal. The feedback filter filters an equalized signal. The combiner combines the feed-forward filtered signal and the feedback filtered signal. The decision device maps the combined signal to one symbol of a symbol set. The control circuit receives the combined output and generates a slice control signal. The multiplexer selects the combined signal or the mapped signal as the equalized according to the slice control signal when operated in the blind mode.Type: ApplicationFiled: April 18, 2007Publication date: October 23, 2008Applicant: MediaTek Inc.Inventors: Yih-Ming Tsuie, Wei-Ting Wang
-
Publication number: 20080205504Abstract: Decision feedback equalizers and related equalizing method are provided. One proposed decision feedback equalizer includes: a feed-forward filter for filtering an incoming signal to generate a filtered signal; a feedback filter for generating a feedback signal according to a decision signal; an operating device, coupled to the feed-forward filter and the feedback filter, for generating an output signal according to the filtered signal and the feedback signal; a decision device, coupled to the operating device and the feedback filter, for generating the decision signal according to the output signal; and an updating device coupled to the feedback filter for constraining coefficients of predetermined taps of the feedback filter while updating the tap coefficients of the feedback filter; wherein each predetermined tap of the feedback filter corresponds to a tap of the feed-forward filter.Type: ApplicationFiled: February 26, 2007Publication date: August 28, 2008Inventors: Yih-Ming Tsuie, Yao-Tang Chou, Wei-Ting Wang
-
Patent number: 7406137Abstract: A carrier recovery system includes an in-phase mixer for mixing an incoming signal with an in-phase reference signal to produce an in-phase baseband signal; a quadrature-phase mixer for mixing the incoming signal with a quadrature-phase reference signal to produce a quadrature-phase baseband signal; a DC detector for measuring a DC offset of the quadrature-phase baseband signal; and a frequency synthesizer for generating the in-phase reference signal and the quadrature-phase reference signal according to the DC offset measured by the DC detector. The quadrature-phase reference signal is the in-phase reference signal phase-delayed by ninety degrees. The DC offset of the quadrature-phase baseband signal is caused by a pilot tone of the VSB signal for a selected carrier in an Advanced Television Systems Committee (ATSC) digital television (DTV) receiver. By minimizing the DC offset, the carrier recover system locks the quadrature-phase reference signal and the in-phase reference signal to the selected channel.Type: GrantFiled: August 2, 2004Date of Patent: July 29, 2008Assignee: Realtek Semiconductor Corp.Inventors: Cheng-Yi Huang, Bao-Chi Peng, Wei-Ting Wang
-
Publication number: 20080144708Abstract: An equalization circuit and an equalization method implemented thereby are provided. A received symbol is received to generate a equalizer output. In the equalization circuit, an equalizer performs equalization to the received symbol based on a SNR value of the equalizer output. A SNR estimator coupled to the output of equalizer receives the equalizer output to measure the SNR value. The equalizer equalizes the received symbol by the LMS algorithm in which coefficients are recursively updated by a step size, and the step size is adjusted based on the SNR value.Type: ApplicationFiled: December 19, 2006Publication date: June 19, 2008Applicant: MEDIATEK INC.Inventors: Yih-Ming Tsuie, Chiao-Chih Chang, Wei-Ting Wang
-
Publication number: 20080141096Abstract: A decoding apparatus and method are described. The decoder includes N successive decoder groups numbered 1 to N arranged in series. Each decoder group includes primary decoding means for decoding the first sequence of codewords in combination with the source sequence of symbols to produce a sequence of primary decoded symbols; intermediate interleaving means for interleaving the sequence of primary decoded symbols using intra-block permutations on the source sequence of symbols and inter-block permutations on each intra-block permuted block across the predetermined number of the intra-block permuted blocks to produce a sequence of intermediate symbols; secondary decoding means for decoding the second sequence of codewords in combination with the sequence of intermediate symbols and a sequence of interleaved source symbols to produce a sequence of secondary decoded symbols; and de-interleaving means for de-interleaving the sequence of secondary decoded symbols to produce a sequence of estimated symbols.Type: ApplicationFiled: November 20, 2007Publication date: June 12, 2008Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Yan-Xiu Zheng, Yu T. Su, Wei-Ting Wang
-
Publication number: 20080095225Abstract: A system, a multi-stage equalizer and a method for generating an equalized signal in response to a received signal are provided. The multi-stage equalizer comprises a first DFE, and a second DFE. The first DFE generates a first signal in response to the received signal. The second DFE generates a second signal in response to the first signal, subtracts the second signal from a third signal to generate a fourth signal, and generates the equalized signal in response to the fourth signal, wherein the fourth signal is an unsliced signal. The method comprises steps of: providing a first DFE to generate a first signal in response to the received signal; providing a second DFE to generate a second signal in response to the first signal and to subtract the second signal from a third signal to generate a fourth signal; and generating the equalized signal in response to the fourth signal.Type: ApplicationFiled: October 18, 2006Publication date: April 24, 2008Applicant: MEDIATEK INC.Inventors: Wei-Ting Wang, Ming-Luen Liou, Yi-Ching Liao
-
Patent number: 7313004Abstract: An integrated control circuit for a resonant power converter includes a minimum-frequency programming circuit connected a first resistor to program a minimum switching frequency of the power converter. A feedback circuit is coupled to a feedback terminal to receive a feedback signal for generating an adjustment signal. A maximum-frequency programming circuit connects a second resistor to determine a maximum switching frequency in response to the adjustment signal. An oscillator is coupled to the minimum-frequency programming circuit and the maximum-frequency programming circuit to generate an oscillation signal for determining the switching frequency of the power converter. A feed-forward circuit is connected to a feed-forward terminal to receive a feed-forward signal represents the input voltage of the power converter. The switching frequency is increased in response to decrease of the feedback signal, and the switching frequency is increased in response to the increase of the feed-forward signal.Type: GrantFiled: December 21, 2006Date of Patent: December 25, 2007Assignee: System General Corp.Inventors: Ta-Yung Yang, Chien-Yuan Lin, Kuang-Chih Shih, Wei-Ting Wang
-
Patent number: 7218359Abstract: A digital television receiver includes a tuner for down-converting an incoming signal to produce a down-converted signal according to a local oscillator signal corresponding to a selected channel. A filter is coupled to the tuner for filtering the down-converted signal to produce an intermediate frequency (IF) signal. A carrier recovery unit is coupled to the filter for locking to a carrier frequency of the IF signal, and a pre-shift unit is coupled to the tuner. By shifting the local oscillator signal in a first direction by a predetermined first frequency shift in a first phase of carrier recovery, and then by shifting the local oscillator signal in a second direction by a second frequency shift in a second phase of carrier recovery, the pre-shift unit ensures a pilot tone of a selected channel is not filtered from the down-converted signal by the filter.Type: GrantFiled: July 26, 2004Date of Patent: May 15, 2007Assignee: Realtek Semiconductor Corp.Inventors: Bao-Chi Peng, Cheng-Yi Huang, Wei-Ting Wang
-
Publication number: 20060164554Abstract: A method and apparatus for rejecting an interference signal from an input frequency spectrum. The method includes the steps of receiving the input signal; frequency-shifting the received input signal by a first frequency-shifting amount; and filtering the frequency-shifted input signal to filter out the interference component from the input signal.Type: ApplicationFiled: January 27, 2005Publication date: July 27, 2006Inventors: Wei-Ting Wang, Cheng-Yi Huang, Bao-Chi Peng
-
Publication number: 20060119579Abstract: A mouse and pad assembly includes a pad member; and a mouse member, which is arranged on top of and connected to the pad member in such a way as to be angularly and linearly displaceable relative to the pad member; the mouse member has several buttons on an upper side thereof, and it has a sensor device facing the pad member for sensing movement of the mouse member relative to the pad member.Type: ApplicationFiled: December 7, 2004Publication date: June 8, 2006Inventor: Wei-Ting Wang
-
Publication number: 20060023810Abstract: A carrier recovery system includes an in-phase mixer for mixing an incoming signal with an in-phase reference signal to produce an in-phase baseband signal; a quadrature-phase mixer for mixing the incoming signal with a quadrature-phase reference signal to produce a quadrature-phase baseband signal; a DC detector for measuring a DC offset of the quadrature-phase baseband signal; and a frequency synthesizer for generating the in-phase reference signal and the quadrature-phase reference signal according to the DC offset measured by the DC detector. The quadrature-phase reference signal is the in-phase reference signal phase-delayed by ninety degrees. The DC offset of the quadrature-phase baseband signal is caused by a pilot tone of the VSB signal for a selected carrier in an Advanced Television Systems Committee (ATSC) digital television (DTV) receiver. By minimizing the DC offset, the carrier recover system locks the quadrature-phase reference signal and the in-phase reference signal to the selected channel.Type: ApplicationFiled: August 2, 2004Publication date: February 2, 2006Inventors: Cheng-Yi Huang, Bao-Chi Peng, Wei-Ting Wang
-
Publication number: 20060018409Abstract: A digital television receiver includes a tuner for down-converting an incoming signal to produce a down-converted signal according to a local oscillator signal corresponding to a selected channel. A filter is coupled to the tuner for filtering the down-converted signal to produce an intermediate frequency (IF) signal. A carrier recovery unit is coupled to the filter for locking to a carrier frequency of the IF signal, and a pre-shift unit is coupled to the tuner. By shifting the local oscillator signal in a first direction by a predetermined first frequency shift in a first phase of carrier recovery, and then by shifting the local oscillator signal in a second direction by a second frequency shift in a second phase of carrier recovery, the pre-shift unit ensures a pilot tone of a selected channel is not filtered from the down-converted signal by the filter.Type: ApplicationFiled: July 26, 2004Publication date: January 26, 2006Inventors: Bao-Chi Peng, Cheng-Yi Huang, Wei-Ting Wang
-
Publication number: 20060007299Abstract: An interference detecting circuit for use in an ATSC system and for detecting interference of an ATSC signal includes: a buffering module for delaying to output a first PN63 synchronization format data when receiving the first PN63 synchronization format data; a correlation arithmetic circuit coupled to the buffering module for receiving the ATSC signal and performing a correlation operation on a second PN63 synchronization format data and the delayed first PN63 synchronization format data to output a detection signal when receiving the second PN63 synchronization format data; and a determining circuit for determining whether performing interference rejection on the ATSC signal or not according to the result of the above-mentioned correlation operation.Type: ApplicationFiled: June 28, 2005Publication date: January 12, 2006Inventors: Wei-Ting Wang, Cheng-Yi Huang, Bao-Chi Peng