Transcript
Lab No.10
Discrete time Fourier transform (Frequency response)
CECOS College of Engineering and IT March – July 2012
Designed by : Dawar Awandawar@cecos.edu.pk
DTFT : Example
CECOS College of Engineering and IT March – July 2012
DTFT : Example
CECOS College of Engineering and IT March – July 2012
DTFT : Example
CECOS College of Engineering and IT March – July 2012
DTFT : Example
CECOS College of Engineering and IT March – July 2012
DTFT : Example
CECOS College of Engineering and IT March – July 2012
DTFT : Example
CECOS College of Engineering and IT March – July 2012
Task
CECOS College of Engineering and IT March – July 2012
1. Repeat DTFT_example for three other values of
frequency
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Time Shifting(Program12_2)
x[n-no] ↔ e-jωn0X(ejω)
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Time Shifting(Program12_2)
Task
CECOS College of Engineering and IT March – July 2012
1. Run Program12_2, and comment on your results
2. Run the program for some other values of time shift
3. Run the program for some other sequences
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Frequency Shifting(Program12_3)
ejω0nx[n] ↔ X(ej(ω-ω0))
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Frequency Shifting(Program12_3)
Task
CECOS College of Engineering and IT March – July 2012
1. Run Program12_3, and comment on your results
2. Run the program for some other values of frequency
shift
3. Run the program for some other sequences
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Convolution(Program12_4)
x[n]*h[n] ↔ X(ejω) H(ejω)
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Convolution(Program12_4)
Task
CECOS College of Engineering and IT March – July 2012
1. Run Program12_3, and comment on your results
2. Run the program for some other sequences
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Time reversal(Program12_5)
x[-n] ↔ X(e-jω)
DTFT Properties
CECOS College of Engineering and IT March – July 2012
Time reversal(Program12_5)
Task
CECOS College of Engineering and IT March – July 2012
1. Run Program12_3, and comment on your results
2. Run the program for some other sequences
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