公开(公告)号：US08931026B2

公开(公告)日：2015-01-06

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

IPC: H04N7/173 ,  H04N21/61 ,  H04N7/20 ,  H04L27/00

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。

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

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04L25/03

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.

公开(公告)号：US10224971B1

公开(公告)日：2019-03-05

申请号：US15909116

申请日：2018-03-01

Applicant: MStar Semiconductor, Inc.

Inventor： Ting-Nan Cho ,  Kai-Wen Cheng ,  Tai-Lai Tung

IPC: H04B1/12 ,  H04B1/10 ,  H04L25/02

Abstract: A symbol rate estimating device includes: a power spectrum density (PSD) estimating unit, estimating a PSD of an input signal; an index searching unit, searching for a cut-off frequency index in the PSD; an adjacent channel interference (ACI) detecting unit, detecting whether the input signal has ACI to generate a detection signal; a threshold adjusting unit, generating an adjusted index number threshold according to the detection signal; an index output unit, outputting the cut-off frequency index according to the adjusted index number threshold; and a symbol calculating unit, calculating a symbol rate of the input signal according to the cut-off frequency index.

公开(公告)号：US09912501B2

公开(公告)日：2018-03-06

申请号：US15256991

申请日：2016-09-06

Applicant: MStar Semiconductor, Inc.

Inventor： Yu-Hsien Ku ,  Chia-Wei Chen ,  Kai-Wen Cheng

IPC: H04L27/00 ,  H04L25/40 ,  H04B1/16 ,  H04L27/34

CPC classification number: H04L25/40 ,  H04B1/16 ,  H04L27/2053 ,  H04L27/22 ,  H04L27/3483 ,  H04L27/38

Abstract: A signal detection method associated with a constellation diagram corresponding to a modulation scheme is provided for enhancing the reliability of code rate search. A mask is provided between two adjacent constellation points in the modulation scheme. The signal detection method includes: receiving a plurality of signals, and mapping the plurality of signals to the constellation diagram; when a first signal among the plurality of signals is located in the mask, discarding the first signal; and when a second signal among the plurality of signals outside located in the mask, determining a constellation point corresponding to the second signal.

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。