高考问答棚户区属于什么产权:谁能帮忙翻译一下？
来源：百度文库 编辑：高考问答 时间：2024/04/28 04:05:35
Frequency Division Multiplexing (FDM)
Frequency Division Multiplexing (FDM) is a method of sending multiple analog signals simultaneously over one channel by separating the channel into subchannels, or bands. Each band in the channel has its own carrier signal with a unique frequency. The carrier signal for each band is then modulated by an information signal, just as in FM.A guardband, or a narrow range of unused frequency between each band’s frequency, ensures that signals do not interfere with each other. Each band in an FDM signal is reserved for the information assigned to it. IF no information is being sent, the frequency remains unused-a fact that, along with guardbands, which reserve unused frequency ranges, makes FDM somewhat inefficient.
FDM was develop in the 1930s by telephone companies to combine multiple voice signals over one wire. It can be used foe voice, video, or data signals ,but its most common applications are radio broadcast transmission and cable TV. It may also be used to transmit multiple voice signals over long distance analog line. Because FDM is an older, inefficient form of multiplexing ,its use on modern data networks is limited.
Frequency Division Multiplexing (FDM) is a method of sending multiple analog signals simultaneously over one channel by separating the channel into subchannels, or bands. Each band in the channel has its own carrier signal with a unique frequency. The carrier signal for each band is then modulated by an information signal, just as in FM.A guardband, or a narrow range of unused frequency between each band’s frequency, ensures that signals do not interfere with each other. Each band in an FDM signal is reserved for the information assigned to it. IF no information is being sent, the frequency remains unused-a fact that, along with guardbands, which reserve unused frequency ranges, makes FDM somewhat inefficient.
FDM was develop in the 1930s by telephone companies to combine multiple voice signals over one wire. It can be used foe voice, video, or data signals ,but its most common applications are radio broadcast transmission and cable TV. It may also be used to transmit multiple voice signals over long distance analog line. Because FDM is an older, inefficient form of multiplexing ,its use on modern data networks is limited.
答：翻译如下：
司多频率(路)司多频率(路)的方式发送了100多个频道的模拟信号的同时,把渠道变成阶. 每个级别都有自己的渠道,提供了一个独特的信号传送频率. 承运人信号,每个阶调制信号的信息,如警卫阶,或者是狭窄的使用频率之间的每一个级别的班次,保证信号不会互相干扰. 每一个阶路信号留作资料交给它. 如果没有寄出的资料,使用的频率是一个事实,随着警卫阶,保留使用频率范围,使一些没有路. 路是在1930年代发展起来的公司多次电话语音信号100线. 敌人可以用声音、图像、数据、信号,但最常见的应用和有线广播电视传输. 它也可以用来传输语音信号,对多种模拟长途路线. 因为是旧路,没有多形式、利用现代网络数据有限.
频率区分多工法 (FDM)
频率区分多工法 (FDM) 是藉由分开通道进入次通道、或乐团同时地超过一个通道作信号的送多个类比的方法。 通道的每个乐团用独特的频率有它自己的运送者信号。运送者信号为每个乐团然后被一个数据信号调整, 正如在 FM。在每条乐团的频率之间的 guardband 、或狭窄类型的不用的频率, 确定信号不干扰彼此。 一个 FDM 信号的每个乐团为被指定给它的数据被保留。如果没有数据正在被送,频率保持不用-一种事实哪一, 连同 guardbands 一起, 保留不用的频率排列, 使 FDM 略微无效率。
FDM 是在 1930 年代被联合多种声音信号超过一电线的电话公司发展。 它能被用仇敌声音、录象机或数据信号，但是它最通常的申请是收音机广播传输和有线电视。 它也可能用来传输在长的距离类比线上的多种声音信号。 因为 FDM 是一个比较年长又无效率形式的多工法 ,它的使用在现代的数据网络上是有限。