第6章 电视信号接收与显示原理

,第二级,第三级,第四级,第五级,第6章 电视信号接收与显示原理,22,信控系,电 视 原 理 （2011春季学期）,第6章电视信号接收与显示原理,6.1黑白电视接收机的组成,1、黑白电视接收机的组成,黑白电视接收机的组成：,主要由,信号通道,（包括高频调谐器（俗称高频头）、中频放大（简称中放）、视频放大（简称视放）和伴音通道）,扫描电路,（同步分离，行、场扫描电路）,电源三部分组成。,扫描通道,信号通道,信号通道的任务：,将天线接收到的高频电视信号变换成视频亮度信号和音频伴音信号。,亮度信号激励显像管产生黑白图像，伴音信号推动扬声器产生电视伴音。,扫描电路的任务：,为显像管提供行、场扫描电流和各种电压，使显像管产生与电视台摄像管同步扫描的光栅。,电源,电源部分的任务：,将交流市电转变成电视机所需要的各种直流电压。,（1）信号通道,a、混频：,变换前：,图像载频低于本频道的伴音载频；,变换后：,图像中频高于伴音中频。,b、,检波器有两个作用：,一是从中频信号中检出其包络视频电视信号；,二是利用检波器的非线性作用，由图像中频和伴音中频差拍产生第二伴音中频信号。,混频、检波、鉴频的频谱变换图,检波器的输出信号经过视放前置分别送给：,视放级；同步分离电路、自动增益控制电路（AGC，automatic Cain Control）；伴音中放电路。,视频前置（,预视放,）采用射级跟随器进行预放大，以增强其负载能力。,预视放也有两个作用：,一是将全电视信号和第二伴音中频信号分离；,二是将CVBS（Composit Video-Blanking-and-Sync，彩色全电视信号,（复合视频消隐和同步，也叫做基带视频或RCA视频,）,）进行电流放大，分别馈给视放级、同步分离级和AGC电路，并将第二伴音中频信号进行电压放大后馈给伴音通道。,第二伴音中频信号经伴音中放电路的放大和限幅，由鉴频器解调出伴音信号，再经低频放大，推动扬声器产生电视伴音。,鉴频前：,为调频信号，其伴音载频是：从天线至混频级为欲接收频道的,伴音载频,；混频至检波为伴音,第一中频31.5M,；检波至鉴频为伴音,第二中频6.5M,。,鉴频后：,为伴音的音频信号。,伴音信号波形,在负极性调制中，对应于白色电平图像，其中频信号的载波幅度最小。电视中的调制度通常规定为90%，即白色电平时，图像的载波幅度为最大幅度（同步头幅度）的10%。,所以，要求进入检波器的伴音第一中频信号的幅度应当小于或等于最大幅度的5%。,这就是中频特性曲线中，伴音中频（31.5MHZ）要衰减至5%（-26dB）的原因。,（防止伴音对图像的干扰）,从天线至预视放,称为黑白电视机图像信号和伴音信号的,公共通道,。,（2）同步分离和扫描电路,自动频率相位控制电路（AFPC）的原理：,直接将行同步信号加入鉴相器，让行振荡信号与其比较。如果两者的频率和相位存在差别，则输出与误差成比例的电压，并经过低通滤波器去控制行振荡器的频率和相位，使其与发送端同频同相。,（3）电源,直流电源电压是由交流市电经变压器降压后，经整流、滤波和稳压得到。,黑白电视接收机中通常采用串联型直流稳压电源。,最基本的PAL制,彩色电视接收机的方框图如图6-4所示。与黑白电视机有许多相同的地方，,主要不同点是：,一是增加了解码器和彩色显像管的附属电路；,二是彩色显像管取代了黑白显像管。,6.1.2彩色电视接收机的组成,彩色电视接收机原理框图,1、解码器,主要任务是：,将CVBS进行解码，还原成,R,、,G,、,B,三个基色信号。,组成：,亮度通道、色度通道、副载波恢复电路、解码矩阵四部分组成。,（1）亮度通道,亮度通道的任务：,产生不带色度信号的亮度信号，并要求它与色差信号在时间上保持一致，且具有适当的幅度。,亮度通道的组成：,自动分解力控制电路,(ARC，Automatic Resolution Control)、副载波陷波电路、亮度放大电路、延迟均衡电路等。,（2）色度通道,色度通道的任务：,产生,U,、,V,两个,色差信号。,色度通道的组成：,带通放大、梳状滤波器、,U,、,V,同步检波电路。,（3）副载波恢复电路,副载波恢复电路的任务：为U同步检波器提供与电视台同频、同相的基准副载波，为V同步检波器提供,90,副载波。,副载波恢复电路的组成：色同步选通放大器、鉴相器、副载波晶体振荡器（晶振）、PAL识别电,路、电子开关及90,移相器等电路。,（4）解码矩阵电路,解码矩阵电路的任务：,将,Y,、,U,、,V,还原成,R,、,G,、,B,三个基色信号，经视放末级放大后，送到彩色显像管，产生彩色图像。,解码矩阵电路的组成：,自动色度控制电路（ ACC,，,Automatic Chrominance Control)、自动消色器(ACK， Automatic Colour Killer)等附属电路。,2、解码器中CVBS的处理步骤,在彩色电视机的解码器中CVBS经过5步的信号处理。,（1）亮度的分离（,频率或频谱分离,）；,（2）色度信号和色同步信号的分离（,时间分离,）；,（3）,蓝色度信号,u,(t)和红色度信号,v,(t)的分离（,频率、相位双重分离,）；,（4）同步检波，即色度信号被解调成色差信号；,（5）亮度信号Y和色差信号U、V经矩阵电路变换成3个基色信号R、G、B。,本节完,8JbMeQhTkWoZr%u(x+B2E5H9KcOfRiUmXp#s&v)z0C3F7IaLdPgSkVnYq$t*w-A1D4G8JbNeQhTlWoZr%u(y+B2E6H9KcOfRjUmXp!s&v)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8KbNeQiTlWo#r%v(y+B3E6H9LcOgRjUmYp!s&w)z0C4F7JaMdPhSkVnZq$u*x-A2D5G8KbNfQiTlXo#r%v(y0B3E6I9LcOgRjVmYp!t&w)z1C4G7JaMePhSkWnZr$u*x+A2D5H8KbNfQiUlXo#s%v(y0B3F6I9LdOgRjVmYq!t&w-z1C4G7JbMePhTkWnZr$u(x+A2E5H8KcNfRiUlXp#s%v)y0C3F6IaLdOgSjVmYq!t*w-z1D4G7JbMeQbMeQhTkWoZr%u(x+B2E5H9KcNfRiUmXp#s&v)y0C3F7IaLdPgSjVnYq$t*w-A1D4G8JbNeQhTlWoZr%u(y+B2E6H9KcOfRjUmXp!s&v)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8JbNeQiTlWo#r%u(y+B3E6H9LcOfRjUmYp!s&w)z0C4F7JaMdPhSkVnZq$u*x-A2D5G8KbNfQiTlXo#r%v(y0B3E6I9LcOgRjUmYp!t&w)z1C4F7JaMePhSkWnZq$u*x+A2D5H8KbNfQiUlXo#s%v(y0B3F6I9LdOgRjVmYq!t&w-z1C4G7JbMePhTkWnZr$u*x+A2E5H8KcNfQiUlXp#s%v)y0B3F6IaLdOgSjVmYq!t*w-z1D4G7JbMeQhTkWoZr$u(x+B2E5H9KcNfRiUmXp#s&v)y0C3F7IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E6H9KcOfRiUmXp!s&v)z0C3F7IaMdPgSkVnYq$t*x-A1D5G8JbNeNeQiTlWo#r%u(y+B3E6H9LcOfRjUmXp!s&w)z0C4F7IaMdPhSkVnZq$t*x-A2D5G8KbNeQiTlXo#r%v(y+B3E6I9LcOgRjUmYp!t&w)z1C4F7JaMePhSkWnZq$u*x+A2D5H8KbNfQiTlXo#s%v(y0B3E6I9LdOgRjVmYp!t&w-z1C4G7JaMePhTkWnZr$u*x+A2E5H8KcNfQiUlXp#s%v)y0B3F6IaLdOgSjVmYq!t&w-z1D4G7JbMePhTkWoZr$u(x+A2E5H9KcNfRiUlXp#s&v)y0C3F6IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E6H9KcOfRiUmXp#s&v)z0C3F7IaLdPgSkVnYq$t*w-A1D5G8JbNeQhTlWo#r%u(y+B2E6H9LcOfRjUmXp!s&w)z0C4F7IaMdPhSkVnZq$t*x-A1D5G8KbN8KbNeQiTlXo#r%v(y+B3E6I9LcOgRjUmYp!s&w)z1C4F7JaMdPhSkWnZq$u*x-A2D5H8KbNfQiTlXo#s%v(y0B3E6I9LdOgRjVmYp!t&w-z1C4G7JaMePhTkWnZr$u*x+A2D5H8KcNfQfQiUlXp#s%v)y0B3F6I9LdOgSjVmYq!t&w-z1D4G7JbMePhTkWoZr$u(x+A2E5H9KcNfRiUlXp#s&v)y0C3F6IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTkWoZr%u(x+B2E5H9KcOfRiUmXp#s&v)z0C3F7IaLdPgSkVnYq$t*w-A1D5G8JbNeQhTlWo#r%u(y+B2E6H9LcOfRjUmXp!s&v)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8KbNeQiTlWo#r%v(y+B3E6H9LcOgRjUmYp!s&w)z1C4F7JaMdPhSkWnZq$u*x-A2D5H8KbNfQiTlXo#r%v(y0B3E6I9LcOgRjVmYp!t&w)z1C4G7JaMePhSkWnZr$u*x+A2D5H8KcNfQiUlXo#s%v)y0B3F6I9LdOgSjVmYq!t&w-z1C4G7JbMePhTkWnZr$u(x+A2E5H8KcNfRiUlXp#s%v)y0C3F6IaLdOgSjVnYq!t*w-z1D4G8JbMeQhTkWoZr%u(x+B2E5H9KcNfRiUmXp#s&v)y0C3F7IaLdPgSjVnYq$t*w-A1D4G8JbNeQhTlWoZr%u(y+B2E6H9KcOfRjUmXp!s&v)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8JbNeQiTlWo#r%u(y+B3E6H9LcOfRjUmYp!s&w)z0C4F7JaMdPhSkVnZq$u*x-A2D5G8KbNfQiTlXo#r%v(y0B3E6I9LcOgRjUmYp!t&w)z1C4F7JaMePhSkWnZq$u*x+A2D5H8KbNfQiUlXo#s%v(y0B3F6I9LdOgRjVmYq!t&w-z1C4G7JbMePhTkWnZr$u(x+A2E5H8KcNfQiUlXp#s%v)y0B3F6IaLdOgSjVmYq!t*w-z1D4G7JbMeQhTkWoZr$u(x+B2E5H9KcNfRiUmXp#s&v)y0C3F7IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E6H9KcOfRiUmXp!s&v)z0C3F7IaMdPgSkVnYq$t*x-A1D5G8JbNeQiTlWo#r%u(y+B2E6H9LcOfRjUmXp!s&wYp!s&w)z0C4F7JaMdPhSkVnZq$u*x-A2D5G8KbNfQiTlXo#r%v(y+B3E6I9LcOgRjUmYp!t&w)z1C4F7JaMePhSkWnZq$u*x+A2D5H8KbNfQiUlXo#s%v(y0B3F6I9LdOgRjVmYq!t&w-z1C4G7JaMePhTkWnZr$u*x+A2E5H8KcNfQiUlXp#s%v)y0B3F6IaLdOgSjVmYq!t*w-z1D4G7JbMeQhTkWoZr$u(x+B2E5H9KcNfRiUlXp#s&v)y0C3F6IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E6H9KcOfRiUmXp!s&v)z0C3F7IaMdPgSkVnYq$t*x-A1D5G8JbNeQhTlWo#r%u(y+B2E6H9LcOfRjUmXp!s&w)z0C4F7IaMdPhSkVnZq$t*x-A2D5G8KbNeQiTlXo#r%v(y+B3E6I9LcOgRjUmYp!s&w)z1C4F7JaMdPhSkWnZq$u*x-A2D5H8KbNfQiTlXo#s%v(y0B3E6I9LdOgRjVmYp!t&w-z1C4G7JaMePhTkWnZr$u*x+A2D5H8KcNfQiUlXo#s%v)y0B3F6I9LdOgSjVmYq!t&w-z1D4G7JbMePhTkWoZr$u(x+A2E5H9KcNfRiUlXp#s&v)y0C3F6IaLdPgSjVnYq!t*w-z1D4G8JbMeQhTkWoZr%u(x+B2E5H9KcOfRiUmXp#s&v)z0C3F7IaLdPgSkVnYq$t*w-A1D5G8JbNeQhTlWo#r%u(y+B2E6H9KcOfRjUmXp!s&v)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8KbNeQiTlWo#r%v(y+B3E6H9LcOgRjUmYp!s&w)z1C4F7JaMdPhSkWnZq$u*x-A2D5G8KbNfQiTlXo#r%v(y0B3E6I9LcOgRjVmYp!t&w)z1C4G7JaMePhSkWnZr$u*x+A2D5H8KcNfQiUlXo#s%v)y0B3F6I9LdOgRjVmYq!t&w-z1C4G7JbMePhTkWnZr$u(x+A2E5H8KcNfRiUlXp#s%v)y0C3F6IaLdOgSjVnYq!t*w-z1D4G8JbMeQhTkWoZr$u(x+B2E5H9KcNfRiUmXp#s&v)y0C3F7IaLdPgSjVnYq$t*w-A1D4G8JbNeQhTlWoZr%u(y+B2E6H9KcOfRjUmXpXp!s&v)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8JbNeQiTlWo#r%u(y+B3E6H9LcOfRjUmYp!s&w)z0C4F7JaMdPhSkVnZq$u*x-A2D5G8KbNfQiTlXo#r%v(y0B3E6I9LcOgRjVmYp!t&w)z1C4F7JaMePhSkWnZq$u*x+A2D5H8KbNfQiUlXo#s%v(y0B3F6I9LdOgRjVmYq!t&w-z1C4G7JbMePhTkWnZr$u(x+A2E5H8KcNfQiUlXp#s%v)y0B3F6IaLdOgSjVmYq!t*w-z1D4G7JbMeQhTkWoZr$u(x+B2E5H9KcNfRiUmXp#s&v)y0C3F7IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E6H9KcOfRiUmXp!s&v)z0C3F7IaMdPgSkVnYq$t*x-A1D5G8JbNeQiTlWo#r%u(y+B3E6H9LcOfRjUmXp!s&w)z0C4F7IaMdPhSkVnZq$t*x-A2D5G8KbNeQiTlXo#r%v(y+B3E6I9LcOgRjUmYp!t&w)z1C4F7JaMePhSkWnZq$u*x-A2D5H8KbNfQiTlXo#s%v(y0B3E6I9LdOgRjVmYp!t&w-z1C4G7JaMePhTkWnZr$u*x+A2E5H8KcNfQiUlXp#s%v)y0B3F6I9LdOgSjVmYq!t&w-z1D4G7JbMePhTkWoZr$u(x+A2E5H9KcNfRiUlXp#s&v)y0C3F6IaLdPgSjVnYq!t*w-A1D4G8JbMeQhTlWoZr%u(x+B2E5H9KcOfRiUmXp#s&v)z0C3F7IaLdPgSkVnYq$t*w-A1D5G8JbNeQhTlWo#r%u(y+B2E6H9LcOfRjUmXp!s&w)z0C4F7IaMdPgSkVnZq$t*x-A1D5G8KbNeQiTlWo#r%v(y+B3E6H9LcOgRjUmYp!s&w)z1C4F7JaMdPhSkWnZq$u*x-A2D5H8KbNfQiTlXo#s%v(y0B3E6I9LcOgRjVmYp!t&w)z1C4G7JaMePhSkWnZr$u*x+A2D5H8KcNfQiUlXo#s%v)y0B3F6I9LdOgSjVmYq!t&w-z1D4G7JbMePhTkWnZr$u(x+A2E5H8KcNfRiUlXiUlXp#s&v)y0C3F6IaLdOgSjVnYq!t*w-z1D4G8JbMeQhTkWoZr%u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