公开(公告)号：US09131198B2

公开(公告)日：2015-09-08

申请号：US13845405

申请日：2013-03-18

Applicant: MStar Semiconductor, Inc.

Inventor： Chu-Hsin Chang ,  Kai-Wen Cheng ,  Yi-Ying Liao ,  Tung-Sheng Lin ,  Tai-Lai Tung

IPC: H04L27/06 ,  H04N9/67 ,  H04H40/90 ,  H04L27/26 ,  H04N7/20

CPC classification number: H04N9/67 ,  H04H40/90 ,  H04L27/2657 ,  H04L27/2672 ,  H04L27/2688 ,  H04L27/2689 ,  H04N7/20

Abstract: A signal processing apparatus includes an initial detecting module, a mixer, a symbol rate detecting module, a judging module and a correcting module. The initial detecting module determines an initial carrier frequency offset of an input signal according to a spectrum of the input signal. The mixer adjusts the input signal according to the initial carrier frequency offset to generate a frequency-compensated signal. The symbol rate detecting module determines a symbol rate of the input signal. The judging module judges whether the initial carrier frequency offset is correct according to the frequency-compensated signal. When a judgment result of the judging module is negative, the correcting module determines a corrected carrier frequency offset according to the symbol rate and the spectrum.

Abstract translation: 信号处理装置包括初始检测模块，混频器，符号率检测模块，判断模块和校正模块。 初始检测模块根据输入信号的频谱确定输入信号的初始载波频率偏移。 混频器根据初始载波频率偏移调整输入信号，以产生频率补偿信号。 符号率检测模块确定输入信号的符号率。 判断模块根据频率补偿信号判断初始载波频率偏移是否正确。 当判断模块的判断结果为否定时，校正模块根据符号率和频谱确定校正的载波频率偏移。

公开(公告)号：US09191195B2

公开(公告)日：2015-11-17

申请号：US14535599

申请日：2014-11-07

Applicant: MStar Semiconductor, Inc.

Inventor： Chih-Cheng Kuo ,  Wen-Chieh Yang ,  Chu-Hsin Chang ,  Tai-Lai Tung

IPC: H04L7/04 ,  H04L25/03 ,  H04N21/438

CPC classification number: H04L7/042 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/03 ,  H04N21/4382

Abstract: A method for calculating an error of a sampling clock is provided. The sampling clock is used for sampling a signal to generate a first sample data group and a second sample data group. Each of the first and second sample data groups includes a header having a predetermined sequence. The method includes: performing a correlation operation on the first and second sample data groups with data of the predetermined format to obtain first and second correlation results, respectively; comparing the first and second correlation results to generate a sample data group offset; and generating the error of the sampling clock according to the sample data group offset and a time difference between the first and second sample data groups.

Abstract translation: 提供了一种计算采样时钟误差的方法。 采样时钟用于采样信号以产生第一采样数据组和第二采样数据组。 第一和第二样本数据组中的每一个包括具有预定序列的报头。 该方法包括：利用预定格式的数据对第一和第二采样数据组执行相关操作，以分别获得第一和第二相关结果; 比较第一和第二相关结果以产生样本数据组偏移; 以及根据样本数据组偏移和第一和第二样本数据组之间的时间差产生采样时钟的误差。

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。

公开(公告)号：US20150124913A1

公开(公告)日：2015-05-07

申请号：US14535599

申请日：2014-11-07

Applicant: MStar Semiconductor, Inc.

Inventor： Chih-Cheng Kuo ,  Wen-Chieh Yang ,  Chu-Hsin Chang ,  Tai-Lai Tung

IPC: H04L7/00

CPC classification number: H04L7/042 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/03 ,  H04N21/4382

Abstract: A method for calculating an error of a sampling clock is provided. The sampling clock is used for sampling a signal to generate a first sample data group and a second sample data group. Each of the first and second sample data groups includes a header having a predetermined sequence. The method includes: performing a correlation operation on the first and second sample data groups with data of the predetermined format to obtain first and second correlation results, respectively; comparing the first and second correlation results to generate a sample data group offset; and generating the error of the sampling clock according to the sample data group offset and a time difference between the first and second sample data groups.

Abstract translation: 提供了一种计算采样时钟误差的方法。 采样时钟用于采样信号以产生第一采样数据组和第二采样数据组。 第一和第二样本数据组中的每一个包括具有预定序列的报头。 该方法包括：利用预定格式的数据对第一和第二采样数据组执行相关操作，以分别获得第一和第二相关结果; 比较第一和第二相关结果以产生样本数据组偏移; 以及根据样本数据组偏移和第一和第二样本数据组之间的时间差产生采样时钟的误差。

公开(公告)号：US08931017B2

公开(公告)日：2015-01-06

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: H04N7/20 ,  H04N21/61 ,  H04H40/90 ,  H04N21/438 ,  H04H20/26

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。

公开(公告)号：US20130258201A1

公开(公告)日：2013-10-03

申请号：US13845405

申请日：2013-03-18

Applicant: MStar Semiconductor, Inc.

Inventor： Chu-Hsin Chang ,  Kai-Wen Cheng ,  Yi-Ying Liao ,  Tung-Sheng Lin ,  Tai-Lai Tung

IPC: H04N9/67

CPC classification number: H04N9/67 ,  H04H40/90 ,  H04L27/2657 ,  H04L27/2672 ,  H04L27/2688 ,  H04L27/2689 ,  H04N7/20

Abstract: A signal processing apparatus includes an initial detecting module, a mixer, a symbol rate detecting module, a judging module and a correcting module. The initial detecting module determines an initial carrier frequency offset of an input signal according to a spectrum of the input signal. The mixer adjusts the input signal according to the initial carrier frequency offset to generate a frequency-compensated signal. The symbol rate detecting module determines a symbol rate of the input signal. The judging module judges whether the initial carrier frequency offset is correct according to the frequency-compensated signal. When a judgment result of the judging module is negative, the correcting module determines a corrected carrier frequency offset according to the symbol rate and the spectrum.

Abstract translation: 信号处理装置包括初始检测模块，混频器，符号率检测模块，判断模块和校正模块。 初始检测模块根据输入信号的频谱确定输入信号的初始载波频率偏移。 混频器根据初始载波频率偏移调整输入信号，以产生频率补偿信号。 符号率检测模块确定输入信号的符号率。 判断模块根据频率补偿信号判断初始载波频率偏移是否正确。 当判断模块的判断结果为否定时，校正模块根据符号率和频谱确定校正的载波频率偏移。