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公开(公告)号：US10164671B2
公开(公告)日：2018-12-25
申请号：US15368885
申请日：2016-12-05
Applicant: MStar Semiconductor, Inc.
Inventor： Chia-Wei Chen , Kai-Wen Cheng , Ko-Yin Lai , Tai-Lai Tung
Abstract: An echo cancellation circuit is provided to reduce or eliminate the effects of a pre-echo signal that is part of a received multi-path signal. The circuit includes: a delay module, receiving an input signal and delaying the input signal to generate a plurality of delayed signals; a multiplication module, multiplying the plurality of delayed signals by a plurality of coefficients to generate a plurality of multiplication results, respectively; a summing circuit, performing a summation on the plurality of multiplication results to generate a summation signal; a subtraction circuit, receiving a first delay signal and generating a subtracted signal according to the first delayed signal and the summation signal; and a coefficient calculating circuit, calculating the plurality of coefficients according to the subtracted signal. The echo cancellation circuit outputs an output signal as the subtracted signal, with the pre-echo signal diminished or eliminated.
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2.发明申请公开(公告)号：US20140157331A1
公开(公告)日：2014-06-05
申请号：US14094891
申请日：2013-12-03
Applicant: MStar Semiconductor, Inc.
Inventor： Chu-Hsin Chang , Kai-Wen Cheng , Yi-Ying Liao , Tung-Sheng Lin , Tai-Lai Tung
IPC: H04N21/61 , H04N21/643
CPC classification number: H04N21/6193 , H04H20/26 , H04H40/90 , H04N21/4382 , H04N21/4383
Abstract: A channel scanning method for Digital Video Broadcasting—Satellite (DVB-S) signals is provided. The method includes: scanning a radio frequency (RF) signal according to a normal frequency step; when the Nth channel is detected, obtaining a difference between a low boundary of an Nth channel and a high boundary of an (N−1)th channel; and, when the difference is within a predetermined bandwidth range, scanning the RF signal between the high boundary of the (N−1)th channel and the low boundary of the Nth channel according to a narrow frequency step. The normal frequency step is greater than the narrow frequency step.
Abstract translation: 提供了一种用于数字视频广播卫星（DVB-S）信号的频道扫描方法。 该方法包括：根据正常频率步长扫描射频（RF）信号; 当检测到第N个信道时，获得第N个信道的低边界与第（N-1）个信道的高边界之间的差; 并且当所述差在预定带宽范围内时，根据窄频率步长扫描第（N-1）个信道的高边界与第N个信道的低边界之间的RF信号。 正常频率步长大于窄频步长。
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公开(公告)号：US09979567B2
公开(公告)日：2018-05-22
申请号：US15172272
申请日：2016-06-03
Applicant: MStar Semiconductor, Inc.
Inventor： Chia-Wei Chen , Kai-Wen Cheng , Ko-Yin Lai
CPC classification number: H04L25/03019 , H04L2025/03636
Abstract: An equalization enhancing module includes: a multiplication unit, multiplying a plurality of equalized signals by a scaling coefficient to obtain a plurality of scaled signals; a determination unit, coupled to the multiplication unit, determining whether the plurality of scaled signals are located in a predetermined region to generate a plurality of determination results; a ratio calculating unit, coupled to the determination unit, calculating an inner ratio associated with a ratio of the plurality of scaled signals located in the predetermined region; and a coefficient calculating unit, coupled to the ratio calculating unit, calculating the scaling coefficient according to the inner ratio.
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公开(公告)号：US10230551B2
公开(公告)日：2019-03-12
申请号：US15890466
申请日：2018-02-07
Applicant: MStar Semiconductor, Inc.
Inventor： Ting-Nan Cho , Chia-Wei Chen , Kai-Wen Cheng , Tai-Lai Tung
Abstract: A signal processing device for a receiver includes: a descrambler, descrambling an input signal to generate a descrambled signal; a phase recovery circuit, performing phase recovery according to the descrambled signal to generate a phase recovered signal; an equalization module, performing equalization according to the phase recovered signal to generate an equalized signal; and a decoder, decoding the equalized signal to obtain data included in the input signal.
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公开(公告)号：US10075285B2
公开(公告)日：2018-09-11
申请号：US15610743
申请日：2017-06-01
Applicant: MStar Semiconductor, Inc.
Inventor： Ting-Nan Cho , Kai-Wen Cheng , Tai-Lai Tung
CPC classification number: H04L7/0331 , H03L7/0807 , H03L7/093 , H03L7/10 , H04L7/0016 , H04L27/00 , H04L2027/0053
Abstract: A bandwidth adjusting method for a phase-locked loop (PLL) unit of a phase recovery module includes: adjusting an operating bandwidth of the PLL unit to a first bandwidth; measuring multiple first phase errors between a compensated input signal, which is generated according to an input signal and a phase compensating signal that the PLL unit generates, and a reference clock signal, and obtaining a first statistical value of the first phase errors; adjusting the operating bandwidth of the PLL unit to a second bandwidth; measuring multiple second phase differences between the compensated input signal and the reference clock signal, and obtaining a second statistical value of the second phase differences; and adjusting the operating bandwidth according to the first statistical value and the second statistical value. The first bandwidth and the second bandwidth are obtained by interpolating an upper bandwidth limit and a lower bandwidth limit.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20170353201A1
公开(公告)日：2017-12-07
申请号：US15368885
申请日：2016-12-05
Applicant: MStar Semiconductor, Inc.
Inventor： Chia-Wei Chen , Kai-Wen Cheng , Ko-Yin Lai , Tai-Lai Tung
CPC classification number: H04B1/1027 , H04B1/16
Abstract: An echo cancellation circuit includes: a delay module, receiving an input signal and delaying the input signal to generate a plurality of delayed signals; a multiplication module, multiplying the plurality of delayed signals by a plurality of coefficients to generate a plurality of multiplication results, respectively; a summing circuit, performing a summation on the plurality of multiplication results to generate a summation signal; a subtraction circuit, receiving a first delay signal and generating a subtracted signal according to the first delayed signal and the summation signal; and a coefficient calculating circuit, calculating the plurality of coefficients according to the subtracted signal. The echo cancellation circuit outputs an output signal as the subtracted signal.
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公开(公告)号：US20130318557A1
公开(公告)日：2013-11-28
申请号：US13900821
申请日：2013-05-23
Applicant: MStar Semiconductor, Inc.
Inventor： Kai-Wen Cheng , Yi-Ying Liao , Tung-Sheng Lin , Tai-Lai Tung
CPC classification number: H04N21/6143 , H04L27/00 , H04L27/0006 , H04L27/066 , H04N7/20 , H04N21/4382
Abstract: An apparatus for detecting spectrum inversion includes a different correlator and a determining module. The differential correlator performs an odd-order differential correlation on an input signal and a known signal to generate a differential correlation result. When the input signal is determined as corresponding to a target signal of the known signal, the determining module detects spectrum inversion in the input signal according to the phase of the differential correlation result.
Abstract translation: 用于检测频谱反转的装置包括不同的相关器和确定模块。 差分相关器对输入信号和已知信号执行奇数阶微分相关，以产生微分相关结果。 当确定输入信号对应于已知信号的目标信号时，确定模块根据微分相关结果的相位来检测输入信号中的频谱反转。
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公开(公告)号：US10368116B2
公开(公告)日：2019-07-30
申请号：US15890643
申请日：2018-02-07
Applicant: MStar Semiconductor, Inc.
Inventor： Szu-Hsiang Lai , Yu-Shen Chou , Kai-Wen Cheng
IPC: H04N7/173 , H04N21/266 , H04N21/2383 , H04N21/61 , H03K19/20
Abstract: A roll-off parameter determining module disposed at a receiving terminal is provided. The receiving terminal receives first roll-off information of a first frame and second roll-off information of a second frame. The first frame is adjacent to the second frame. The module for determining a roll-off parameter includes: a register unit; a first determining unit, determining whether one of the first roll-off information and the second roll-off information includes a first data type, and generating a first roll-off parameter indicator; a second determining unit, determining whether one of the first roll-off information and the second roll-off information includes a second data type and outputting a second roll-off parameter indicator; and a look-up table (LUT) unit, looking up an LUT according to the first roll-off parameter indicator and a second roll-off parameter indicator to output a roll-off parameter.
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公开(公告)号：US10298944B2
公开(公告)日：2019-05-21
申请号：US15841624
申请日：2017-12-14
Applicant: MStar Semiconductor, Inc.
Inventor： Kuan-Chou Lee , Kai-Wen Cheng , Tai-Lai Tung
Abstract: A decoding circuit applied to a multimedia apparatus is provided. The decoding circuit is for decoding encoded data to generate system information, and includes multiple processing circuits and a determination circuit. The multiple processing circuits individually process the encoded data to generate multiple processed signals, and respectively correspond to multiple bit combinations of a part of the system information. The determination circuit determines the system information according to the multiple processed signals.
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公开(公告)号：US10263813B1
公开(公告)日：2019-04-16
申请号：US15988110
申请日：2018-05-24
Applicant: MStar Semiconductor, Inc.
Inventor： Chia-Chun Hung , Ting-Nan Cho , Kai-Wen Cheng , Tai-Lai Tung
Abstract: A signal receiving apparatus includes a phase recovery look, a phase estimation circuit, a phase noise detection circuit, and a bandwidth setting circuit. The phase recovery loop performs a phase recovery process on an input signal according to a bandwidth setting. The phase estimation circuit generates an estimated phase associated with the input signal. The phase noise detection circuit determines a phase noise amount according to the estimated phase. The bandwidth setting circuit calculates an average and a variance of the phase noise amounts, and adjusts the bandwidth setting of the phase recovery loop according to the average and the variance.
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