Digital Signal Processing Reference
In-Depth Information
% y is a column vector containing the DT output
% signal time expanded by N
Use linear interpolation based on the neighboring samples to predict any
required unknown values in
x
[
k
].
1.34
(M
ATLAB
exercise) Construct a DT signal given by
−
0
.
003
k
) cos(
π
k
/
20)
x
[
k
]
=
(1
−
e
for 0
≤
k
≤
120
.
(i) Sketch the signal using the
stem
function.
(ii) Using the
mydecimate
(Problem P1.30) and
myinterpolate
(Problem P1.31) functions, transform the signal
x
[
k
] based on the
operation
y
[
k
]
=
x
[
k
/
5] followed by the operation
z
[
k
]
=
y
[5
k
].
What is the relationship between
x
[
k
] and
z
[
k
]?
(iii) Repeat (ii) with the order of interpolation and decimation reversed.
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