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Title:

?????? Digital Signal Processing(DSP)

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Title: Digital Signal Processing(DSP) Author: lfhuang Last modified by: Administrators Created Date: 5/20/2001 10:28:36 PM Document presentation format – PowerPoint PPT presentation

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Title: ?????? Digital Signal Processing(DSP)


1
??? ????????
??????????????????????????????????,????
??????????????IIR????FIR???????IIR???????????????
????????????????????????????????????????????????
??????FIR???????????????????FIR?????,?????????????
??,?????????????????????
2
7.1 ??
7.1.1 ?????? ???????????????
??????????????????????????????
?7-1 ????????????????????
3
???????????????IIR????FIR??????????????????
?,?????????????? ??,??? ???
??????????
?Z?????????IIR????FIR???????????
4
7.1.2 ??????????
???????,?????????????????????????????????????
???????????????????????????????,??????????????????
?
  • d1 ???? d2 ????
  • ?c ?????? ?st??????
  • ?c -?st ???

5
?
?7-2 ?????????????
??????
6
??????
?????? , ,?? ,? ?3dB???????
7
7.1.3 ???????????
  • ??IIR??????????????
  • 1. ???????????????????,???????????????????,??????
    ???????????????,???????????????
  • 2.???????????????????,???????,??????????????

8
7.2??????????????
1.???????
IIR???????????????????,????????????(??,??,
???),??????????????,??????????????,???????/???????
??????????,?????????
9
?7-3 IIR????????
2.????????? (1)???? ???????????????????????
????????????????????????????????????
10
?????????????????
(7.2.1).????????????????? a.????N,
?
b.  ????N,
?
c. ? ????????
d. ????N????????????????
11
??7-4,???????????????????N??????????,?????
????????1/2????,???????????????1???????????
??
?7-4 ????????????????
12
??????????,?????????????????????,?????????
?????????,????????????????????????????????????????
???????? ????????????????? ??????
???????????????? ??????,??
???????????????? ,?
???????????????,??????????????,???????
13
(2)????????? ?????????? ,??????
??????????? ?2N???Sk
????N?????
14
N???
????????s???????,??2N??????
?/N???,????j????,??????????????????
?
(3)????
????????????????
??????? ???????
15
??(7.2.1) ????
???????? ??? ??????????N?????????
16
?N ???(7.2.4)??(7.2.5)??????
? ???????????
,? ?????? ?????????? , ? ??
,?????????????
?7.1 ????????????,???????? ????
,???????? ,????? ,????????
?
17
????????? , ,
, ????N,???(7.2.6) ? N4
????????????,?????????   ?? ??(7.2.7)?
? ???(7.2.8)??s,?????????????H(s)?
18
3. ????I???
(1)????
????I????????????

?N????????,???
19
N0,C0(x)1 N1, C1(x)x N2,
C2(x)2x2-12xC1(x)-C0(x)
????CN(x)2xCN-1(x)-CN-2(x) Ngt1
N??,CN(x)???? N??,CN(x)????
20
1) x0, 1 ??Ncos-1x , x 0?1
?????????
N0 , ? 0 C0(x)1
N1 , ? ?/2 ?0, C1(x)0?1
N2 , ? ? ? ? /2 ?0, C2(x)-1 ? 0?1
N3 , ? 3? /2 ?0, C2(x)0 ? -1 ? 0?1
N4 , ? 2? ?0, C2(x)1 ? 0 ? -1 ? 0?1
2) x1, ? )
21
  • x0, Neven, CN(0)1, Nodd, CN(0)0
  • x1, CN(1)1
  • x1, CN(x)?-1, 1????,
  • N??,??????
  • xgt1, CN(x)????,N??,???????

22
(No Transcript)
23
????????????????? 1)0lt lt ?, ?1?
??????, ? ?,??????? 2) 0?,?N???,? 1
,?N?? ?,? ? 3) ?,????N?,
?????? ? 4) gt ?,??????, ??,N??,??? ????
24
(2)???? 1)???????????????? ???N? ????????
???? ??????N??????????? 2)???????????
,? ??? ????????????? ,??????? ????? ?
25
7.2.2???????( Impulse Invariance )
1.????
??????????????h(n)??????????????ha(t)????,?
h(n)ha(nT), T?????.?? Ha(s) ? H(z)???? ha(t)
?????? h(n) ?Z??,?
?????????? ???Z?? ?
??????????????????S???Z??????????
26
????
?
?????????
??h(n)?z??
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
(2) ??????????
31
2.????
???????Z?????????????????,?
???????,??????????????????? ??
??????????????????????????(???????
??)
32
?????????????,???????????????,????????????
??,?????????????
????????????
??,???
????????????,?????Z???,
?????????????????????????????
???????,?????????????
???????,????????????????????
33
??????? 1)?????????????,??
???,????T??,?????
2)?????????????,??
???,?
??,??????,???
??,??
??,????????N,??
???
34
3.?????
??????????????????,????????????
NgtM,??????????? ???????
???????,?ha(t)??????????????????
35
??h(n)?Z ??,????????????
????????????,?????
??
??
36
4.????
?7.2 IIR???????????? 1)???????P0.1prad,
???????s0.25prad
2)??????ap3dB, ??????as15dB
?
1) ??DF??, ?DF????????LPF??
37
(No Transcript)
38
4) ?H(z)
39
7.2.3?????? (Bilinear Transform)
1.????
s???z??????? ????? ???S???jO????S1??jO1???
? ???,????????????
(7.2.11)
??C?????,?????????????C ?
40
? ? ?, ? ??0??? ,?S?????
?????S1??? ??. ?(7.2.11)????? ????????????
S??, ???S???S1??????? ?? S1
?????????????Z??,??
41
????s???z?????????

(7.2.12)
42
2.???????
?(7.2.11)?????????????????????????????????????
???????,????????????????????????
1)???????????????????????????????,??
???,?
???
2)?????????????(??????
????????????? ????,?
43
????????????????????????????,?????????????????
44
(No Transcript)
45
?S/2
-?S/2
46
3. ?????O????????????
47
(No Transcript)
48
4.?????
????H(Z)???? ????????????????? ??????? ?????
????? ? (1)???? ?????????? ?
?????,??????????????????? ?
???????? (2)?????? ? ? ? ???????????????
? (3)????????? ? ???
49
?7.3 ??IIR????????????LPF 1)fp50Hz
fs125Hz 2)ap3dB, as15dB 3)????f1kHz
? 1)???????? 2)??????
50
(No Transcript)
51
(No Transcript)
52
(No Transcript)
53
(3)???????
a.?????LPF???BPF???BPF
54
?
????
55
(No Transcript)
56
(No Transcript)
57
(No Transcript)
58
???LPF???
59
7.2.4???????????????
??????????????,??????????,????????????,?????????
????????????????????,????????????????????????
1.?????
? ?????????????????????????, ?
??????????????????????????
60
??? ? ?? ? ?0?,??? ??0?? ? ? ,?? ?
????? ,???????????????
61
????? (1)?????????????? ?
? (2)????????????????????? ??????? ? ,?????
? (3)?????? ????????????? ????????????
??????
(4)????????? ? (5)????????
???????????? ???? ,??????? ?
62
(6)???????,????????????????????????. 2.?????
? ????????????????????, ?????????,
?????????,? ?????,?B?????????,
63
? ????????,???
???? ? ??????
64
, ,??? ???????????????? ?
,?????????????? ? ,?
???? ????,? ????? ???????????????
65
????????????
3.?????
??????????????????, ?????,
?????,??????????,? ?????,?B?????????,
66
? ????? ,
,???
67
????????????? ???????????????
????????????
68
?7.6 ???????????,?????????p0.8prad,???????3dB,??
?????s0.5prad,???????18dB???????????? ?(1)??????
???? ?p0.8prad,ap3dB
?s0. 5prad,as18dB
(2) ????????????? ?T2,??
69
(3)????????????G(p)???????????N?????
?N2
70
(4)???????????????G(p)? ?????,?ps/Oc?????? (
5)?????????????????G(s) ?????1/s,??????Ha(s)
(6)????????????H (s)???????H(z)
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