首页
登录
从业资格
Digital data can also be represented by(
Digital data can also be represented by(
考试题库
2022-08-02
96
问题
Digital data can also be represented by( )signals by use of a modem. The modem converts a series of binary voltage ( ) into an analog signal by encoding the digital data onto a carrier frequency. The resulting signal occupies a certain spectrum of ( ) centered about the carrier and may be propagated across a' medium suitable for that carrier. The most common modems represent digital data in the voice ( ) and hence allow those data to be propagated over ordinary voice-grade ( ) lines. At the other end of the line, another modem demodulates the signal to recover the original data.A.networkB.telephoneC.typeD.signal
选项
A.network
B.telephone
C.type
D.signal
答案
B
解析
数字数据也可以通过调制解调器用模拟信号来表示。调制解调器把数字数据编码为一种载波频率,从而可以把二进制电压序列转换为模拟信号。产生的信号占用了以某一频率为中心的载波频带,可以通过适合于该载波的介质进行传播。大多数通用的调制解调器表示话音频带的数字数据,因而允许这些数据在通常的话音级电话线路上传播。在线路的另一端,另外一个调制解调器对信号进行解调并恢复原来的数据。
转载请注明原文地址:http://tihaiku.com/congyezige/2431496.html
本试题收录于:
初级网络管理员题库软件水平考试初中高级分类
初级网络管理员
软件水平考试初中高级
相关试题推荐
Digitaldatacanalsoberepresentedby(
Digitaldatacanalsoberepresentedby(
Digitaldatacanalsoberepresentedby(
下面算法中,属于非对称密钥加密算法的是(53)。A.DES(DigitalEn
Almostall()havebuilt-indigitalcamer
DigitalSignalProcessing(DSP),haseme
DigitalSignalProcessing(DSP),hasemerg
DSP(DigitalSignalProcessor)是一种特别适合于进行数
Almostall()havebuilt-indigitalcame
Almostall()havebuilt-indigitalcamer
随机试题
Chapter-A-Dayisintendedtohelppeople______.[br]MsBeecherdecidedtoexpa
[originaltext]W:Ijustwanttoeatout;Idon’tthinkwehaveenoughtimetom
PeoplewhospendalotoftimesurfingtheInternetaremorelikelytoshow
[originaltext](5)TheWomen’sWorldCupfinalmatchbetweentheUSandJapan
Wecannotseeanypossibilityofbusiness______yourpriceisonthehighside
Bilingual(双语的)educationinschoolshaslongbeenapoliticalhotpotato—itwa
LOF与ETF的区别是( )。A.申购和赎回的标的不同 B.申购和赎回的场所
属于第一批国家历史文化名城的城市是( )。A.西安 B.平遥 C.天津
(2016年真题)因违法行为或者违纪行为被解除职务的期货交易所、证券交易所、证券
一平面简谐波的波动方程为y=0.01cos10π(25t-x)(SI),则在t=
最新回复
(
0
)