-
公开(公告)号:KR1020040025294A
公开(公告)日:2004-03-24
申请号:KR1020020057204
申请日:2002-09-19
Applicant: 대한민국(전남대학교총장)
IPC: H04N7/015
CPC classification number: H04L7/0335 , H04N5/4401 , H04N5/455
Abstract: PURPOSE: A digital television symbol timing synchronous algorithm is provided to square an existing Gardner method with a received signal, and to apply the squared value to a Gardner symbol timing detector, then to recover a symbol clock, thereby restoring symbol timing without frequency components. CONSTITUTION: A Gardner symbol timing recoverer using a prefilter is independently operated from a squared Gardner symbol timing recoverer. The Gardner symbol timing recoverer using the prefilter filters a signal passing through a square root cosine filter1(303) to a prefilter1(304), and uses the filtered signal as an input of a timing detector1(308). The timing detector(308) generates a timing error, amplifies an error value in an amplifier1(312), and obtains an average in a loop filter1(311), then controls parameters of an interpolation filter1(302) in an address calculator1(310). Power of a signal passing through the prefilter1(304) is measured in a power calculator1(306). A distributive calculator1(309) measures changes of the power, and controls a gain value of the amplifier1(312). The distributive calculator1(309) measures how fast a channel changes.
Abstract translation: 目的:提供数字电视符号定时同步算法,使现有的加德纳方法具有接收信号,并将平方值应用于加德纳符号定时检测器,然后恢复符号时钟,从而恢复符号定时,无需频率分量。 构成:使用预过滤器的加德纳符号定时回收器是从加纳德符号定时回收器的平方加法独立运行的。 使用预滤波器的加德纳符号定时恢复器将通过平方根余弦滤波器1(303)的信号滤波到预滤波器1(304),并且使用经滤波的信号作为定时检测器1的输入(308)。 定时检测器(308)产生定时误差,放大放大器1中的误差值(312),并获得环路滤波器1(311)中的平均值,然后控制地址计算器1(310)中的内插滤波器1(302)的参数 )。 在功率计算器1(306)中测量通过预滤器1(304)的信号的功率。 分配计算器1(309)测量功率的变化,并控制放大器1的增益值(312)。 分布式计算器1(309)测量通道改变的速度。