praktikum tlk
DESCRIPTION
laboratorijske vjezbeTRANSCRIPT
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.
, 2013
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:
_________________________________________________________________________ 3
1.
_____________ 4
1.1. ( RC ) __________________________________________________________________ 5
1.2. ( RLC ) __________________________ 6
2. ___________________________ 8 2.1. ___________________________________________________ 8
2.1.1. _________________________ 10 2.1.2.
____________________________________________________ 11 2.1.3. -2 -1 ______________________________________________ 12
2.2. AM _______________________ 15 2.2.1. _____________________________ 15 2.2.2. -2 _____________________________________________ 17
2.3. _____________________________________ 19
3. ________________________ 20 3.1. ________________________________________________ 20
3.1.1. ______________________________ 21 3.1.2. ____________________________________ 23 3.1.3. ________________________________________ 23 3.1.4. _______________________________ 24
3.2. ______________________________________________ 26 3.2.1. ____________________________ 26
3.3. _____________________________________ 27
4. _______________________ 29
4.1. _______________________________________________ 29 4.1.1. PAM ___________________________________________________ 29 4.1.2. PM a _______________ 31 4.1.3. __________________________________________________ 32 4.1.4. ___________________________________________________ 34
4.2. ________________________________________________ 35 4.3. _____________________________________ 38
______________________________________________________________________ 40
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3
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4
1.
.
:
1. )(tx )(ty , )( +tx )( +ty ( )
2. ( )ix t ( )iy t , :
( )1
( )n
i ii
x t a x t=
= , ( )1
( )n
i ii
y t a y t=
= .
,
.
.
(
) :
( )( ) ( ) jH j A e = ,
)(A , )( .
.. )( jX , .. :
)()()( jHjXjY =
,
:
)(ln)( Aa =
: ,
.
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5
1.1. (
RC )
:
.
:
1.1.
1.1.
( )5inU V rms= 100f Hz= .
.
( )outU f f= .
gf . ..........gf kHz= , :
1............
2gf KHz
RCpi= = .
R , 3,3R k= 10R k= .
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6
o 3,3R k=
..........gf kHz= , : 1
............
2gf KHz
RCpi= = .
o 10R k=
..........gf kHz= , : 1
............
2gf KHz
RCpi= = .
( )outU f f= . ,
. f .
1.2. ( RLC
)
:
o .
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7
:
1.2.
1.2.
( )5inU V rms= 100f Hz= .
.
.
( )outU f f= .
O 01
............
2f kHz
LCpi= = .
( )outU f f= . .............UGf kHz= , .............OGf kHz= , .............OG UGB f f kHz= =
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8
2.
2.1.
,
.
. ,
.
: (),
(-2)
(-1).
:
( )0 0 0( ) 1 ( ) cosu t U m m t t= +
:
- ( )0 01 ( )U m m t+ - 0m
- )(tm - 0
( ).
,
:
( ) ( )0 0 0 0 0 0 0 01 1( ) cos cos cos2 2m mu t U t U m t U m t = + + +
; ,
0 m () 0 m + ().
-2 :
( ) 0( ) cosu mu t K u t t=
:
- ( )mu t - 0
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9
( ) - uK
( ).
, 2 :
( ) ( )0 01 1( ) cos cos2 2u m m u m mu t K U t K U t = + +
; 0 m ()
0 m + ().
1 :
( ) ( )0 01 1( ) cos sin2 2m mqu t u t t u t t =
:
- ( )mu t - ( )mqu t - 0
(-) -1
, (+) -1 .
, -1 :
( ) ( )0cosm m mu t U t =
; 0 m ()
0 m + ().
,
.
.
, 9.2.1.2. .
. , .
, 9.2.2.1.
-2 .
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10
2.1.1.
:
.
:
2.1.
2.1.
:
inf
20 2 2 1,5
1
T
DC
U f kHz U VU f kHz U VU U V
= =
= =
=
.
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11
2.1.2.
: ,
.
:
2.2.
2.2.
:
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12
inf
20 2 2 1,5
1
T
DC
U f kHz U VU f kHz U VU U V
= =
= =
=
( )inU f t= ( )outU f t= .
, 0m .
2.1.3. -2 -1
-2
:
2.3. ( ( )1outU f t= ( )2outU f t= )
:
2.3.
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13
2.3.
:
inf
20 2 V2 1,5 V
TU f kHz UU f kHz U
= =
= =
( )1outU f t= ( )2outU f t= .
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14
-1
: -1
2.4. ( ( )2outU f t= )
:
2.4.
2.4.
:
20 2TU f kHz U V= =
( )SSBU f t= .
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15
2.2. AM
, .
, ,
.
()
()
.
.
2.2.1.
:
.
:
2.5.
.
2.5.
:
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16
inf
20 2 V1 1 V
1,5 V
T
DC
U f kHz UU f kHz UU U
= =
= =
=
( )AMU f t= , ( )DEMU f t= ( )outU f t= .
.
?
(RC )?
DCU
(. >1) outU . .
.
?
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17
2.2.2. -2
: -2
:
2.6.
2.6.
:
.
( )DSBU f t= , ( )DEMU f t= ( )outU f t= .
inf
20 2 V2 1 V
TU f kHz UU f kHz U
= =
= =
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18
.
( )DEMU f t= ( )outU f t= .
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19
2.3.
1. , -2 -1
.
2. , -2 -1
.
3. .
4. -2 .
5. , -2 -1 .
6.
,
.
7.
-2
, .
8.
-2
.
9. .
10.
.
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20
3.
3.1.
, ,
,
, ,
.
:
( )0( ) cosu t U t=
0U )(t .
0( )t t = + ,
0 . ( )mu t
[ ]( ) ( )m it u t = = ).(t
:
0 0( )i
i id d tdt dt
= = + = +
i
( )i mk u t = ,
.k const = , (FM).
[ ]0 max i mk U = = ,
mU .
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21
( )0 0 0( ) ( )i mt dt t k u t t m t dt = = + = + ,
)(tm .
, FM :
( )0 0 0( ) cos ( )u t U t m t dt = +
FM
:
2 ( 1)m
B f m= + , 0m
fm f
= ,
mf
.
, 1%
.
F .
.
FM :
= + FM
= F +
FM = +
F = +
RLC .
3.1.1.
: .
(VCO)
.
:
3.1.
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22
3.1.
VCOf .
( )inf f U=
........of kHz= ( 0inU = )
.
VCOin
fkU
=
?
?
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23
3.1.2.
:
:
3.2.
3.2.
.
:
o ?
o ?
3.1.3.
j:
:
3.3.
3.3.
:
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24
0in
0
1 1 0,5 V 2 1 V
U f kHz UU
= =
=
:
max
min
1fT
= , minmax
1fT
= , ( )max min12f f f =
minT maxT .
?
?
3.1.4.
: (m)
:
3.4
3.4.
:
inf 0,1 V; 0,25 V; -0,5 V U U =
.
:
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25
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26
inf
ff
= m
fm f
= = .
3.2.
FM :
AM-FM ,
3.2.1.
: C-
.
:
3.5.
3.5.
:
inf 2 0,5 VU f kHz U= =
( )infU f t= , ( )FMU f t= , ( )AFMU f t= ( )outU f t= .
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27
3.3.
1.
?
2. FM
FM .
3.
?
4.
?
5. ( )mf u t = , )(t .
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28
6.
?
7. ?
.
8.
AM-FM ?
9. FM
?
10. .
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29
4.
4.1.
/
, . /
:
;
,
,
.
PAM (
).
( ).
2nq = , n . ,
u . .
,
.
n ().
30
.
,
() (M)
4.1.1. PAM
:
PAM
:
4.1.
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30
4.1.
:
inf 1 1,5 V 8s
U f kHz UU f kHz
= =
=
.
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31
4.1.2. PM a
: PM
.
:
4.2.
4.2.
inf1
inf2
1 1,5 V 2 V
8 TTL levelsync
U f kHz UU UU f kHz
= =
=
=
.
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32
:
o PAM ?
o ,
8kHz, a
15s ?
o PAM
?
4.1.3.
: a
.
:
4.3.
/ .
,
.
.
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33
4.3.
:
o
?
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34
o ?
o ?
o
/ ?
4.1.4.
: .
:
4.4.
4.4.
:
inf 2 2,6 VU f kHz U= =
( )infU f t= , ( )SU f t= , ( )/S HU f t= ( )PCMU f t= .
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35
4.2.
a.
n
.
( ,
), ,
(m
f ).
, .
30 , 30
.
4.2.1.
:
.
:
4.5.
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36
4.5.
.
( )out inU f U=
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37
4.2.2.
:
().
:
4.6.
4.6.
:
inf 1
inf 2
1 1,5 V 2 V
U f kHz UU U
= =
=
( )PAMU f t= , ( )DEMU f t= , ( )1outU f t= ( )2outU f t= .
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38
4.3.
1. ?
2. ?
3. ?
4.
?
5. ?
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39
6.
.
7.
?
8. ?
9.
?
10. , ?
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40
[1] . . ,
.
[2] Filters and Oscillator Circuits, Communication, hps System Technik, 1st
Edition
[3] Modulation Techniques-Modulators, Communication Engineering, hps
System Technik, 1st Edition
[4] Modulation Techniques-Demodulators, Communication Engineering, hps
System Technik, 1st Edition
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