EnglishEnglishFrancais
[ղ] [RSS] [ӡ] [ֺţ С ]

ý弼 

ߣ    ITԴվԭ        ʱ䣺2012-8-1

1ʲôǶý壿

ý壨Multimediaںֻýһ-ʽϢʹý壬ʹõý֣TextͼΣGraphicͼImageAudioFlash͵ͼVideo

2ʲôǶý
ýָһܴṩͼֵȶϢʽļϵͳ

3ý弼Щص㣿

ý弼ص㣺1).ԣ2).Эͬԣ3).ԣ4).ʵʱԣ5).ֻ6).7).Ҫٶȸߡ

4ʲôģźţ

ʱͷ϶źųΪģźš

5ʲôźţ

ʱͷȶɢֱʾźžͳΪźš

6ʲôͼ

ͼfxy꣬һ˳еȼIJÿһĻҶҲõȼҼxyϾȡNôͿԵõһNN飬Ϊͼ

7ʲôIP绰ļɣ

IP绰ָʹTCP/IPЭ硢IntranetרLANWANϽеĺкͨIP绰ϵͳһIP绰նˡIP绰ءأGatekeeperϵͳƷϵͳȼɡ

8ʲôǶýϵͳ򲿷ɣ

ýϵͳǻڼģλصû֮ṩԡƵȶýϢ˫ʵʱ͵ҵϵͳýϵͳҪɻնˡתMFSŵƹɡ

9ýƷʲô

ýƷһƷơزļӹýϳɡװ뷢Ƚ׶Ρ

10ýһЩ豸

ýõĴýϢ豸¼ࣺ

(1)ڽýϢ豸ҪƵɼ˷硢١ɨǡ¼VCD/DVDȡ

(2)ڶԶýϢдĸֹܿҪӿModemƵ༭VCDѹȡ

(3)ýϢ豸Ҫ̿¼Ƶת䡢¼¼ӡȡ

(4)֧֣ƵͼƵͨVCD̿¼ȡ

11Ŀǰʵĺûм۷

Ŀǰʵĺû۷һźŵĴԽԽãȼɸߵDATDigital Audio TapeCDCompact DiscFMFrequency ModulationAMAmplitude Modulationֵ绰ǵƵȷֱΪ20Hz20kHz20Hz20kHz20Hz15kHz50Hz7kHz200Hz3.4kHzڶȣSNRSignal Noise RatioԽԽãһۣרҶʧ̶Ƚд֣ƽֵΪʵַۣΪƽзַMean Opinion Score,MOSõķΪMOS

12ļ֣

У1)2)3)뵭Ч4)Ƶʾͻ졣

13Ӿͼθ֪ģ

֮ܿռijλϵľڣΪйڸþϣҾ䷴͸ã˵УӶĤϲ֪źšռijһĸķ书ʼԸķ͸йء

14ͼͨļࣿ

ͼͨ¼ࣺ1).ͼԤ2).ͼȡ3).ͼʶ

15ͼСġݡβ

ͼŴʱԭͼÿһصɸص㣬Ŵظɸص㣬Ŵٺظɸص㣬ͼֱӦͼСͺϼлСڷŴСǻеظءԾͼĻ䣬ľǡݡ

16ʲôȫźţ

߻ߵУƵźšɫźšͬźźͰźŸһ𣬳Ϊȫźš

17ɫӵʽ׼ļ֣

ɫӵʽ׼֣NTSCơPALƺSECAMơ

18ƵʽЩ

ƵʽУ1)MPEG-12)MPEG-23)MPEG-44)AVIʽ5)RMʽ6)ASFʽ7)DVʽ

19ڼжԺ졢̡ɫδģ

ڼУ졢̡ɫֱ𰴹ǿȣdzIJͬΪ2560ʵǺɫ255Ǵɫ졢ֱ̻8λʾÿռ24λɫֵIJͬʾͬɫɱӻٱʾҶȣȣı仯

20ǰý弼Ӧ÷ΧҪЩ

ý弼ȡĿĽչʹӦ÷ΧؿҪУ1)ýͨϵͳеӦã2)ýڱϵͳеӦã3)ýڹҵеӦã4)ýҽӰϵͳеӦã5)ýڽѧеӦã6)ýģеӦá

21ָֻʲô

ĵһֻֻʵϾDzÿȵһСʱһΣΪȲProportional samplingλʱڵIJΪƵʣSampling FrequenceȵĻǵȼģͳΪLinear MeasuringźŽСʱýСȴʱҲ֮󣬾ͳΪǾAsymmetrical MeasuringNonlinear Measuring

[ղ] [RSS] [ӡ] [ֺţ С ]
Ϊҳ | | Ժ | ѧУͼ | ҷֲ | ˳· | ϵʽ | |