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TRNG I HC CN THKHOA CNG NGH
B MN IN T VIN THNG
BO COTIU LUN TT NGHIP
GVHD: ThS. Trn Nht Khi Hon Sinh vin thc hin
Trn Minh Phc
M s sinh vin
1091059
GVPB: ThS. Nguyn Cao Qu
XY DNG BI TH NGHIM THU PHT AM TRN MATLAB SIMULINK
06/18/14 2
NI DUNG BO CO
1. Gii thiu ti2. C s l thuyt3. Xy dng m hnh v kt qu m phng4. Kt qu t c v kt lun5. Ti liu tham kho
06/18/14 3
1. Gii thiu ti
Mc ch chn ti
- Gii quyt vn kh khn trc mt v vic thiu thit b thc tp cc k thut iu ch.
- Gip sinh vin c th xy dng v m phng cc m hnh iu ch v gii iu ch trc nh m khng cn phi c thit b thc.
06/18/14 4
1. Gii thiu ti
Xy dng m hnhtrn Matlab Simulink
iu ch AM Gii iu ch AM
Gii hn ti
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2. C s l thuyt
Cc kiu iu ch AM c bn
DSBSCAM
DSBTCAM
SSB
VSB
06/18/14 6
Hnh 1. S khi pht AM
2. C s l thuyt
06/18/14 7
Hnh 2. S khi thu AM
2. C s l thuyt
06/18/14 8
Matlab Simulink
Dng m phng Thit kcc m hnh c s
Cho ng hc cng nh cc h thng nhng nhiu lnh vc khc nhau nh:giao tip, iu khin, x l tn hiu s, x l video, hnh nh.
2. C s l thuyt
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Tm hiu ti C s l thuyt
Xy dng cc m hnh sau
PhtDSBTCAM
ThuDSBTCAM
Thu phtDSBTCAM(m thanh)
ng b Bao hnh
3. Xy dng m hnh v kt qu m phng
06/18/14 10
3. Xy dng m hnh v kt qu m phng
PhtDSBTCAM
Hnh 3. S khi pht AM
06/18/14 11
3. Xy dng m hnh v kt qu m phng
M hnh pht AM c xy dng t s khi
Hnh 4. M hnh pht AM
Message S(t)
Carrier Sc(t)
A
AM signal Sm(t)
(1)
(2)
(3)
06/18/14 12
3. Xy dng m hnh v kt qu m phng
Mt s kt qu m phng
Tin tc + A (1)
Sng mang (2)
Sng AM (3)
m = 100%
A = a = 1
fc = 100kHz
fm = 10kHz
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3. Xy dng m hnh v kt qu m phng
Hnh 5. Ph tn ca tin tc Hnh 6. Ph tn ca sng AM
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3. Xy dng m hnh v kt qu m phng
Tch sngDSBTCAM ng b
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3. Xy dng m hnh v kt qu m phng
Hnh 7. M hnh tch sng AM ng b
Message S(t)
A
Carrier Sc(t)Local
Ossillator
IF Fillter
Audio out
(1)
06/18/14 16
3. Xy dng m hnh v kt qu m phng
Mt s kt qu m phngTin tc
pht
Sng AM
Tin tcthu
Sng trung tn
Sng sau khi qua
BPF
m = 100% A = a = 1 fIF = 455kHz
fc = 950kHz fm = 10kHz fLOSC = 1405kHz
06/18/14 17
3. Xy dng m hnh v kt qu m phng
Hnh 8. Ph tn ti tn s 455kHz Hnh 9. Ph tn ti tn s 2355kHz
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3. Xy dng m hnh v kt qu m phng
Tch sngDSBTCAM bao hnh
Hnh 10. S khi thu AM
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3. Xy dng m hnh v kt qu m phng
Mch tch sng bao hnh
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3. Xy dng m hnh v kt qu m phng
AM signal
Tch sngbao hnh
RF in IF filter
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3. Xy dng m hnh v kt qu m phng
Tn hiu pht
Tn hiu thu
Sng AM
m = 66%
A =1.5 , a = 1
fm = 10kHz
fc = 950kHz
fLOSC = 1405kHz
RC = 1/10fm
R = 10 Ohm
C = 1uF
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3. Xy dng m hnh v kt qu m phng
Tn hiu pht
Tn hiu thu
Sng AM
m = 66%
A =1.5 , a = 1
fm = 10kHz
fc = 950kHz
fLOSC = 1405kHz
RC
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3. Xy dng m hnh v kt qu m phng
Tn hiu pht
Tn hiu thu
Sng AM
m = 66%
A =1.5 , a = 1
fm = 10kHz
fc = 950kHz
fLOSC = 1405kHz
RC >> 1/10fm
R = 100 Ohm
C = 10uF
06/18/14 24
3. Xy dng m hnh v kt qu m phng
Thu pht DSBTCAMvi tin tc l file m thanh
Hnh 11. S khi thu pht AM
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3. Xy dng m hnh v kt qu m phng
Hnh 12. M hnh thu pht AM
Audio pht
Audio thu
A
Carrier
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3. Xy dng m hnh v kt qu m phng
Mt s kt qu m phng
Audio pht
Audio thu
Sng AM
Sng AM thu
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3. Xy dng m hnh v kt qu m phng
Hnh 13. Ph tn ca tin tc
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3. Xy dng m hnh v kt qu m phng
Hnh 14. Ph tn ca sng AM
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4. Kt qu t c v kt lun
- Kt qu t c:+ Xy dng thnh cng m hnh thu pht DSBTCAM.+ M phng, kho st c dng sng, ph tn, tnh cht, c
im ca iu ch bin theo kiu DSBTCAM.+ Kho st thm m hnh thu pht AM vi tin tc l file audio.+ Hon thnh bi hng dn sinh vin thc tp thu pht AM.+ Tuy nhin vn cha kho st c ht cc kiu iu ch cn
li nh: DSBSCAM, SSB, VSB.- Kt lun:+ hon thnh c mc tiu ban u t ra ca ti tiu
lun.
06/18/14 30
1. Phm Vn Tn. C s vin thng. i hc Cn Th. 2003.2. Nguyn Ha Duy Khang, Trn Nht Khi Hon, Trng Phong
Tuyn, Nguyn Thanh Tng. Gio trnh thc hnh Truyn d liu. i hc Cn Th. 2005.
3. Nguyn Nh Cng. Kho st tn hiu iu ch dng Matlab. i hc s phm k thut TP.HCM. 2000.
4. Nguyn Thanh Dun. Tm hiu v Simulink trong Matlab. i hc s phm k thut TP.HCM. 2011
5. A Wilkinson, E Tsai. Introduction to Simulink for simulating Amplitude Modulation and Demodulation. 2011.
6. A.J. Wilkinson. Signals and Systems II. Department of Electrical Engineering University of Cape Town. 2013.
7. L Xun K. Bi ging L thuyt tn hiu. Trng i hc Cng ngh Si Gn. 2009.
8. http://www.vi.wikipedia.org/wiki/MATLAB
5. Ti liu tham kho
CM N S CH LNG NGHECA THY V CC BN
TRNG I HC CN TH KHOA CNG NGH B MN IN T VIN THNGNI DUNG BO CO1. Gii thiu tiSlide 42. C s l thuytSlide 6Slide 7Slide 83. Xy dng m hnh v kt qu m phngSlide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 284. Kt qu t c v kt lun5. Ti liu tham khoSlide 31