Cu 1: Tn hiu la cach vit khac cua tn hiu:
THI MN BIN I TN HIU S s: 061 - Thi gian: 45 pht
Cu 1: Tn hiu l cch vit khc ca tn hiu:
(
(
(
(
Cu 2: Ba mu u tin ca p ng xung ca h nhn qu:
ln lt l:
( 1 , 0.7 , - 0.21 ( 1 , 0.7 , 0.21
( 1 , - 0.7 , - 0.21 ( 1 ,- 0.7 , 0.21Cu 3: Cho hai h thng:
(1)
(2)
( C hai u tuyn tnh ( C hai u phi tuyn
( Ch c h (2) tuyn tnh
( Ch c h (1) tuyn tnh
Cu 4: Cho h thng:
Hm truyn t ca h ny l:
( (
( (
Cu 5: Cho hai tn hiu v . Quan h gia X1(k) v X2(k) l:
( (
( (
Cu 6: Cho . T lu thut ton FFT phn thi gian N = 8, suy ra X(7)
l:
(
(
(
(
Cu 7: Tn hiu tng t c ly mu vi tn s 16 kHz ri tnh DFT 512 mu. Tn
s (Hz) ti vch ph k = 64 l:
( 64 ( 1968.75 ( 2000 ( 2031.25Cu 8: B lc nhn qu:
y(n) - 0.2 y(n-1) = x(n) - x(n-2) c p ng xung l:( (
( (
Cu 9: Cho hai h thng:
(1)
(2)
( H (1) khng quy, h (2) quy ( H (1) quy, h (2) khng quy
( C hai h u quy
( C hai h u khng quy
Cu 10: Cho tn hiu i qua b lc c p ng xung
Tn hiu ra ti n = 1 l:
( 0 ( 0.41 ( 1 ( - 0.41
Cu 11: Cho .
y l ph ca tn hiu sau:
( (
( C ( v ( u ng ( C ( v ( u sai
Cu 12: Cho v cc quan h sau:
Tn hiu l:
( ( ( (
Cu 13: Cho tn hiu
i qua h thng . Tn hiu ra l:
( x(n) (
( (
Cu 14: Mt b lc nhn qu to tn hiu sin tn s c hm truyn t l: Dng b
lc ny to tn hiu sin 2 kHz vi tn s ly mu 8 kHz. Khi tn hiu vo l xung
dirac, tn hiu ra l:
( (
( (
Cu 15: Cho tn hiu i qua h thng FIR . Tn hiu ra ti n = 1 l:
( 0 ( 4 ( 2 ( 1
Cu 16: Cho . y l bin i Z ca hm x(n) nhn qu sau:
( (
( (
Cu 17: H thng
( n nh (Khng n nh
n nh vi iu kin h nhn qu
( n nh vi iu kin h khng nhn quCu 18: Tn hiu tng t c ly mu vi tn
s 44.1 kHz ri tnh DFT vi kch thc ca s DFT l 23.22 ms. phn gii ca
DFT (tnh bng Hz) l:
( 40.07 ( 43.07 ( 42.07 ( 41.07
Cu 19: Cho tn hiu i qua h thng lc phn chia h s M = 2, p ng xung
ca b lc l:
Tn hiu ra h thng trn l:
( (
( (
Cu 20: B lc Haar c hm truyn t l:
( (
( (
-1
a
z - 1
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