英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

【英语时差8,16】录像机如何记录B

时间:2015-11-18 08:21来源:互联网 提供网友:yajing   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

 But here’s a mystery: When you press pause on the VCR, the screen doesn’t go blank. Instead, you get a frozen image. Remember, you need a changing magnetic signal to create even a still video image. If the video tape isn’t moving, where is this changing signal coming from? We’re used to VCRs doing this, but it’s actually kind of strange. It would be like pressing pause on a cassette deck and having the sound remain in your speakers, Pavarotti holding his high C until you press play again. VCRs do this trick by moving both the tape, AND the playback heads, which spin rapidly past the tape as it moves through the machine. Pausing a video tape does indeed stop the tape, but it doesn’t stop the spinning playback heads. These continue to swipe past the stationary1 tape, detecting enough of a magnetic signal for one still frame of video. Modern, hi-fi VCRs automatically mute the sound when they are paused, so you don’t get a sustained audio sound as well!


点击收听单词发音收听单词发音  

1 stationary CuAwc     
adj.固定的,静止不动的
参考例句:
  • A stationary object is easy to be aimed at.一个静止不动的物体是容易瞄准的。
  • Wait until the bus is stationary before you get off.你要等公共汽车停稳了再下车。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
顶一下
(0)
0%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴