常见视频信号接口简介

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                    <section><section powered-by="gulangu"><section><p><img src="image/20201019/7379b38dbe9c0944cb735d1f43298e74_1.gif" /></p></section></section><section powered-by="gulangu"><section><section><p>常用视频信号分类及支持制式</p></section><p><img src="image/20201019/f7969935228b1e8fe397335e79f2d1d9_2.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 视频信号是指电视信号、静止图像信号和可视电视图像信号 。对于视频信号可支持三种制式：NTSC、PAL、SECAM。</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 常用视频信号接口类型主要为射频接口、复合视频接口（AV端口）、色差接口、VGA输入接口、DVI输入接口、S输入接口、HDMI接口、BNC接口、DisplayPort接口、IEEE1394接口等。</p></section></section></section><section powered-by="gulangu"><section><section><p>射频</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;天线和模拟闭路连接电视机就是采用射频（RF）接口。作为最常见的视频连接方式，它可同时传输模拟视频以及音频信号。RF接口传输的是视频和音频混合编码后的信号，显示设备的电路将混合编码信号进行一系列分离、解码在输出成像。由于需要进行视频、音频混合编码，信号会互相干扰，所以它的画质输出质量是所有接口中最差的。有线电视和卫星电视接收设备也常用RF连接，但这种情况下，它们传输的是数字信号。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/03f3a30e004c8dd77b3c06541cd8be3f_4.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>复合视频（又称AV）</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 不像射频接口那样包含了音频信号，复合视频（Composite）通常采用黄色的RCA（莲花插座）接头。“复合”含义是同一信道中传输亮度和色度信号的模拟信号，但电视机如果不能很好的分离这两种信号，就会出现虚影。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/2171a7272176575d06463b5b0c8d5829_6.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>S端子</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; S端子（S-Video）连接采用Y/C（亮度/色度）分离式输出，使用四芯线传送信号，接口为四针接口。接口中，两针接地，另外两针分别传输亮度和色度信号。因为分别传送亮度和色度信号，S端子效果要好于复合视频。不过S端子的抗干扰能力较弱，所以S端子线的长度最好不要超过7米。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/d7f293f2ec89d4551e363a6571be9819_8.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>色差</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;色差（Component）通常标记为Y/Pb/Pr，用红、绿、蓝三种颜色来标注每条线缆和接口。绿色线缆（Y），传输亮度信号。蓝色和红色线缆（Pb 和Pr）传输的是颜色差别信号。色差的效果要好于S端子，因此不少DVD以及高清播放设备上都采用该接口。如果使用优质的线材和接口，即使采用10米长的线缆，色差线也能传输优秀的画面。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/93db6730e40f46e8d90a98f8e75964cf_10.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>VGA</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;VGA（Video Graphics Array）还有一个名称叫D-Sub。VGA接口共有15针，分成3排，每排5个孔，是显卡上应用最为广泛的接口类型，绝大多数显卡都带有此种接口。它传输红、绿、蓝模拟信号以及同步信号（水平和垂直信号）。使用VGA连接设备，线缆长度最好不要超过10米，而且要注意接头是否安装牢固，否则可能引起图像中出现虚影。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/720cc822d4f7765cbd40439a968a2c09_12.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>DVI</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; DVI（Digital Visual Interface）接口与VGA都是电脑中最常用的接口，与VGA不同的是，DVI可以传输数字信号，不用再进过数模转换，所以画面质量非常高。目前，很多高清电视上也提供了DVI接口。需要注意的是，DVI接口有多种规范，常见的是DVI-D（Digital）和DVI- I（Intergrated）。DVI-D只能传输数字信号，大家可以用它来连接显卡和平板电视。DVI-I则在DVI-D可以和VGA相互转换。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/cc128832990d27e18a1f7b102f1fe84c_14.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>HDMI</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;HDMI（High Definition Multimedia Interface）接口是最近才出现的接口，它同DVI一样是传输全数字信号的。不同的是HDMI接口不仅能传输高清数字视频信号，还可以同时传输高质量的音频信号。同时功能跟射频接口相同，不过由于采用了全数字化的信号传输，不会像射频接口那样出现画质不佳的情况。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/0a3cb3e177903c682411b9665bbbf574_16.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>DisplayPort</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;DisplayPort是由视频电子标准协会(VESA)发布的显示接口。作为DVI接口的继任者，DisplayPort将在传输视频信号的同时加入对高清音频信号传输的支持，同时支持更高的分辨率和刷新率。</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;根据设计，DisplayPort既支持外置显示连接，也支持内置显示连接。VESA希望笔记本厂商不仅使用DisplayPort连接独立显示器，也能使用它来直接连接液晶显示屏和主板，方便笔记本的升级。为此，DisplayPort接口也设计得非常小巧，既方便笔记本的使用，也允许显卡配置多个接口。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/949dddb3cc266066aeca5415b9053dc4_18.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><p>IEEE 1394</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;IEEE 1394也称为火线或iLink，它能够传输数字视频和音频及机器控制信号，具有较高的带宽，且十分稳定。通常它主要用来连接数码摄像机、DVD录像机等设备。IEEE 1394接口有两种类型：6针的六角形接口和4针的小型四角形接口。6针的六角形接口可向所连接的设备供电，而4针的四角形接口则不能。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/6805635394c2e093497ca3d9ee724db2_20.jpg" /></p></section></section><section powered-by="gulangu"><section><section><p>BNC</p></section><p><img src="image/20201019/d7c7cdcb23e06cbd5454f36132a9d268_3.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;BNC（同轴电缆卡环形接口）接口主要用于连接高端家庭影院产品以及专业视频设备。BNC电缆有5个连接头，分别接收红、绿、蓝、水平同步和垂直同步信号。BNC接头可以让视频信号互相间干扰减少，可达到最佳信号响应效果。此外，由于BNC接口的特殊设计，连接非常紧，不必担心接口松动而产生接触不良。</p></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/98f6826f931c256421e1e6d0c5acb03c_22.jpg" /></p></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p>欢</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>迎</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>关</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>注</p></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><p><img src="image/20201019/d531d346033633cf8d619ce01740f58a_23.jpg" /></p></section></section></section><section><section powered-by="gulangu"><section><section></section></section></section></section><section><section powered-by="gulangu"><section><section><p>关注我们</p><p>一起涨姿势！</p></section></section></section></section></section></section></section>