CN1067828C - 具有快速收敛性的均衡电视信号的装置 - Google Patents
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Abstract
一种改进的电视信号均衡装置,包括:第一系数更新模块,用于接收被均衡的电视信号及产生包括第一粗更新系数及细更新系数的第一更新均衡器系数;及第二系数更新模块,在频道变换操作时,用于产生具有与已改变频道相应的粗更新系统的第二更新系数。
Description
本发明涉及用于高清晰度电视信号接收系统的一种均衡装置;更具体地,涉及一种改进的、在频道变换操作时提供更快速均衡器系数的收敛的均衡装置。
在传统的高清晰度(HD)电视系统中,来自多个HD电视信号发射系统的电视信号通过相应的通信频道如无线电频道被发射出来。在选定通信频道上传送电视信号的一个固有问题是频道失真及附加噪音易于干扰对包含在被发射信号中的数据符号的良好接收,由此使HD电视信号接收系统对已接收符号电平之间的辨别能力降低。因此,传统的HD电视信号接收系统包括一用于降低在所选频道中遇到的失真的频道自适应均衡装置,以使可以做出关于哪些数据符号已被发送的更正判定。
该传统的频道自适应均衡装置利用了可抗失真及附加噪音影响的滤波技术,以提供良好的符号判定能力。例如,在Samir.N.Hulyalkar等人的名为“Advanced Digital HDTV Transmission system for Terrestrial video simulcasting”(IEEE Journal on selected Area in Communications,11 NO.1,pp119-125(1993年1月)的文章中公开了一种用于HD电视信号接收系统的传统的均衡装置,该装置包括有一个伴随有两个均衡器的有限脉冲响应(FIR)滤波器,该二均衡器为一盲均衡器和一非线性决定引导均衡器。该FIR滤波器包括多个被称为抽头系数的均衡器系数,这些系数通过利用该盲均衡器和非线性决定引导均衡器被自适应地调整至它们的最佳值以降低频道失真。具体地,对一个选定频道,该盲均衡器用于提供该均衡器系数的初始收敛,该非线性决定引导均衡器接着被用来达到该均衡器的最佳收敛。
然而,在该上述已有技术均衡装置中,因这种滤波系数对各个频道是借助盲均衡器及决定引导均衡器两者来调整的,故要提供均衡器系数的快速收敛是有困难的,尤其是当频道转换操作执行时。
因此,本发明的主要目的是提供一种改进的电视信号均衡装置,它能使均衡系数非常快速地向它们的最佳值收敛,而硬件的复杂程度仅有少许增加。
根据本发明,提供了一种用于具有用于从一选定频道接收电视信号的调谐器的电视信号接收系统中的均衡装置,该装置包括:
第一均衡器滤波装置,用于从调谐器接收电视信号并借助于多个均衡器系数均衡该电视信号,以便产生一个被均衡的电视信号;
第一系数更新装置,用于接收该被均衡电视信号及产生第一更新均衡器系数,它包括:
一个盲均衡模块,用于响应被均衡电视信号并产生第一粗更新系数,及响应被均衡的预测电视信号并产生第二粗更新系数;
一个决定引导均衡模块,用于响应被均衡电视信号及产生细更新系数;及
第一控制装置,用于响应被均衡电视信号并估算它的均方根误差,当该均方根误差等于或小于一预定误差值时,产生细更新系数作为第一更新系数;
第二系数更新装置,用于产生第二更新系数,它包括:
预测频道选择装置,用于对第一控制信号作出响应及产生一个来自选定预测频道的电视信号;
第二均衡器滤波装置及调谐装置,用于接收预测电视信号及借助多个均衡器系数均衡该预测电视信号,以便产生一个被均衡的预测电视信号,其中多个原均衡器系数被第二粗更新系数代替;
第二控制装置,用于响应被均衡预测电视信号及估算它的均方根误差,当该均方根误差等于或小于预定误差值时,产生第一控制信号;及
响应第一控制信号的装置,用于存储与选定预测频道对应的第二粗更新系数,及在电视信号接收系统频道变换时,产生与已改变频道相应的第二粗更新系数作为第二更新系数;及
连接装置,用于使第一更新系数提供到第一均衡器滤波装置,及在变换操作时,使第二更新系数连接到第一均衡器滤波装置。
从以下结合附图对优选实施例的说明,将使本发明上述的及另外的目的和特征更加得以阐明,其中:
附图1表示根据本发明的电视信号的均衡装置的方框电路图。
参照图1,它表示根据本发明的一种电视信号均衡装置。该电视信号均衡装置包括第一调谐器10,具有多个均衡器系数的第一均衡器滤波器20,用于产生第一更新系数的第一系数更新模块50及用于产生第二更新系数的第二系数更新模块60。该电视信号均衡装置还包括一个用于产生频道选择信号CS的频道选择控制模块30,及一个对频道选择信号CS作响应用以选择地连接到第一及第二更新系数的开关40。
第一调谐器10是该领域中公知的,它用于对频道选择信号CS作出响应,从一个选定频道接收电视信号,其中频道选择信号CS是由使用者的选择从一个频道选择控制模块30中产生出来的。被接收到的电视信号接着连接到第一均衡器滤波器20。
第一均衡器滤波器20由一个有限脉冲响应(FIR)滤波器构成,并由多个均衡器系数使来自选定频道的电视信号滤波及均衡。被均衡的电视信号然后连接到第一系数更新模块50并经由一个反转器(derotator)56连接到一下处理器,例如是一个源检测器(未示出)。
第一系数更新模块50,如在由Samir.N.Hulyalkar等人所写文章中描述的,工作在二种方式中,即盲方式(blind mode)及决定引导方式(decision directed mode);并包括一个盲均衡模块51,一个决定引导均衡模块52及一个决定引导载波恢复模块53。在盲方式中,盲均衡模块51使用公知的恒定模数算法(CMA)并用于经由一开关57从均衡器滤波器20接收电视信号及产生出第一粗更新系数,用于提供初始收敛,它经由一多路调制器54及开关40连接到第一均衡器滤波器20。该用于提供初始收敛的第一粗更新系数便取代了保持在第一均衡器滤波器20中的前均衡器系数。这个过程重复进行直到获得初始收敛时为止。
另一方面,在决定引导方式中,决定引导均衡模块52使用最小均方根(LMS)算法,并用于从反转器56接收电视信号及接收一相位误差PE,及产生出细更新系数,以便获得均衡器系数的最佳收敛。决定引导载波恢复模块53也工作在决定引导方式中并产生出相位误差PE,该相位误差被连接到决定引导均衡模块52及反转器56,用以对被发射的电视信号及相应的被接收的电视信号之间的频率及相位偏移进行跟踪并使之减至最小。用于提供最佳收敛的细更新系数经由多路调制器54及开关40连接到第一均衡器滤波器20,以便取代第一均衡器滤波器20中具有的前均衡器系数。这个过程重复进行直到频道变换操作被执行为止。
方式变换的操作借助一个均衡器选择逻辑电路55来控制,它产生出二种方式选择信号:盲方式选择信号及决定引导方式选择信号。这就是,均衡器选择逻辑电路55从反转器56接收被均衡的电视信号以便估算出它的均方根误差(MSE)。该MSE值与一预定的误差值相比较,后者可在所谓眼图的基础上通过试验来确定。当MSE大于预定误差值时,该均衡器选择逻辑模块55产生一个盲方式选择信号,该信号用于启动多路调制器54,以使得由盲均衡模块51输出的第一粗更新系数作为第一更新系数经由多路调制器54连接到开关40。
而当MSE等于或小于预定误差值时,均衡器选择逻辑模块55产生一个决定引导方式选择信号,它用于操作多路调制器54,使由决定引导均衡模块51输出的细更新系数作为第一更新系数连接到开关40。在第一调谐器10接收选定频道的电视信号期间,第一更新系数经由开关40连接到第一均衡器滤波器20。
如图所示,第二系数更新模块60包括第二调谐器61,第二均衡器滤波器62,寄存器63,存储器64及预测频道选择逻辑模块65。第二均衡器滤波器是由FIR滤波器组成的,它的输出信号连接到包含和第一系数更新模块50中的开关57及均衡器选择逻辑模块55。
当第一系数更新模块50操作在决定引导方式中时,预测频道选择逻辑模块65使用公知的至少最近使用的(LRU)算法产生一个预测频道选择信号。第二调谐器61对该预测频道选择信号作出响应并产生出来自选定预测频道的预测电视信号,它被连接到第二均衡器滤波器62。
来自第二均衡器滤波器62的被均衡预测电视信号经由开关57连接到盲均衡器51,它产生出用于选定预测频道的第二粗更新系数。该第二粗更新系数经由寄存器63连接到第二均衡器滤波器62并用于取代保留在第二均衡器滤波器62中的前均衡器系数。均衡器选择逻辑模块55监测来自第二均衡器滤波器62的输出,并当来自第二均衡器滤波器62的被均衡预测电视信号的MSE值小于预定误差值时,产生出预测频道变换信号,该信号被连接到寄存器63及预测频道选择逻辑模块65。寄存器63对预测频道选择信号作出响应并将第二粗更新系数连接到存储器64,用于存储对应于选定预测频道的第二粗更新系数。预测频道选择逻辑模块65然后对预测频道变换信号作出响应并产生出另一预测频道选择信号,该信号被连接到调谐器61,该调谐器便从下一预测频道中接收下一预测电视信号。对于下一预测电视信号将重复上述过程,并使与下一预测频道相对应的第二粗更新系数存储到存储器6中。因此,当第一系数更新模块50工作在决定引导方式中时,多个预测频道被选择,并且使与各个预测频道相对应的各个第二粗更新系数存储到存储器64中。
当频道被使用者改变时,频道选择控制模块产生出频道选择信号,该信号被连接到第一调谐器10,存储器64及开关40。因此,与已改变频道相应的预存储第二粗更新系数开始从存储器64中被读出,并作为第二更新系数经由开关40连接到第一均衡器滤波器20。
如从上述中可看到的,当频道变换操作时,保留在第一均衡器滤波器20中的均衡器系数开始被一已调整系数取代,也即被来自第二系数更新模块50的第二粗更新系数取代。因此,本发明提供了均衡器系数对其最佳值的极为快速的收敛。
虽然本发明仅是对于某些优选实施例描述的,但在不脱离权利要求书中所提出的本发明的精神及范围的情况下是可作出另外的改型及变型的。
Claims (1)
1、用于电视信号接收系统中的一种均衡装置,具有用于从一选定频道接收电机信号的调谐器,该装置包括:
第一均衡器滤波装置,用于从调谐器接收电视信号并借助于多个均衡器系数均衡该电视信号,以便产生一个被均衡的电视信号;
第一系数更新装置,用于接收该被均衡的电视信号及产生第一更新均衡器系数,它包括:
一个盲均衡模块,用于响应被均衡电视信号并产生第一粗更新系数,及响应被均衡的预测电视信号并产生第二粗更新系数;
一个决定引导均衡模块,用于响应被均衡电视信号及产生细更新系数;及
第一控制装置,用于响应被均衡电视信号并估算它的均方根误差,当该均方根误差等于或小于一预测误差值时,产生细更新系数作为第一更新系数;
第二系数更新装置,用于产生第二更新系数,它包括:
预测频道选择装置,用于对第一控制信号作出响应及产生一个来自选定预测频道的电视信号;
第二均衡器滤波装置及调谐装置,用于接收预测电视信号及借助多个均衡器系数均衡该预测电视信号,以便产生一个被均衡的预测电视信号,其中多个原均衡器系数被第二粗更新系数代替;
第二控制装置,用于响应被均衡预测电视信号及估算它的均方根误差,并当该均方根误差等于或小于预定误差值时,产生第一控制信号;及
响应第一控制信号的装置,用于存储与选定预测频道对应的第二粗更新系数,及在电视信号接收系统频道变换时,产生与已改变频道相对应的第二粗更新系数作为第二更新系数;及
连接装置,用于使第一更新系数提供到第一均衡器滤波装置,及在变换操作时,使第二更新系数连接到第一均衡器滤波装置。
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- 1994-11-04 JP JP27128094A patent/JP3208026B2/ja not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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CN1111430A (zh) | 1995-11-08 |
US5502506A (en) | 1996-03-26 |
KR950016344A (ko) | 1995-06-17 |
KR960010495B1 (ko) | 1996-08-01 |
JPH07193734A (ja) | 1995-07-28 |
JP3208026B2 (ja) | 2001-09-10 |
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