? 10.1 ????(FDM)?

1
? 10 ? ?????????
? 10.1 ????(FDM)?   10.2 ????(TDM)
10.3 ?????? 10.4 SDH????
?????
2
? 10 ? ?????????
10.1 ????(FDM---Frequency division Multiplexing)
10.1.1 ??????
? 10 1 ???????????
3
??????????????????????????????????????,???
?????????????????????????,?????????fc1, fc2, ,
fcn,????????????????????????????????,????????DSB-S
C?AM?SSB?VSB?FM?,??SSB????????????????????,???????
?ASK?FSK?PSK?????????
? 10 2 ????????????
4
10.1.2?????????? ??,???????????CCITT??,???
??????????????????????? 3003400Hz,??????????????
??,???????4000 Hz???????
? 10 3(a) ???????????????
5
? 10 3(b,c,d) ???????????????
6
? 10 4 ???????
7
10.1.3???????(FM Stereo Broadcasting)?
??????????????88108 MHz,??FDM????????,??????????
??????????????(L-R)???????????(LR)???????????????
????? 10 - 5??? ??,015 kHz????(LR)??,2353
kHz????(L-R)??, 5975 kHz?????????19
kHz?????????,?????????????????????????????????????
10 -6 ??? ?
8
10.1.3???????(FM Stereo Broadcasting)?
??????????????88108 MHz,??FDM????????,??????????
??????????????(L-R)???????????(LR)???????
? 10 5 ????????????
9
? 10- 6 ????????????????? (a) ??? (b) ???
10
10.2 ????(TDM---Time division Multiplexing)
10.2.1 ??????
??????????????????????????????????????????
???FDM???,????????????????????????TDM???,????????
???,?????????????? 10 - 7 ??????????????????????,?
m1(t)?m2(t)????????????,???????????,??????????????
??????
11
??????????????????,???????????????????????????????
?????,????????????????????????n??????????
? 10- 7 ????????????
12
? 10 8 ???????TDM-PCM?????
13
????????,????PCM?????,?????????????,????TDM-?M???

• ?FDM????,TDM?????????????
• ???????????????????????,????????,?FDM?????????????
  ? ?
• ????????FDM??????????????,??????,??,???????????,
  ?TDM?????????????????

14
10.3 ???????
????????,????????,????????????????????????
?????????,???????????????,?????????????????,??????
?????????????????????????
? 10- 13 ??????????
15
10.4 SDH (Synchronous Digital Hierarchy)?????
SDH????????????????????????,??1??????????????
???????
? 10 17 SDH?????