Seetha Rama Raju Sanapala
  • Member for 6 years, 7 months
  • Last seen more than 2 years ago
  • Bangalore, Karnataka, India
2 answers
0 votes
110 views
Why is $e^{i2\pi Nf_snT}=1$?
Accepted answer
7 votes

Because $Tf{_s}$=1 and $N$ and $n$ are integers. So the exponent becomes 2$\pi$ times an integer, say $K$. But $e{^{i\theta}} = \cos(\theta)+i\sin(\theta)$. Therefore $e{^{i2K\pi}} = 1$.

View answer
2 answers
0 votes
2k views
How does BER performance depend on gray or natural binary?
1 votes

I got the answer from a friend through discussion. Actually, symbol error rate is independent of code used but the bit error rate will be different depending on the coding scheme used. I was saying ...

View answer
2 answers
0 votes
2k views
Transfer function sinusoidal response
1 votes

For any LTI (Linear Time Invariant) system (considering the steady state response i.e. ignoring the transient response which generally becomes negligible in a very short period), if the input is a ...

View answer
1 answers
0 votes
72 views
In which area the image dithering technique is used?
1 votes

In image compression, when the number of bits per pixel are reduced, you might see an artifact called contouring. Dithering is used to reduce this artifact. For more information, please see http:/...

View answer
2 answers
0 votes
2k views
What does convolution has the meaning?
0 votes

An LTI system can be completely described by its impulse response. That means, the output of this system can be calculated for any input, once you are given the output of this LTI system to the ...

View answer
1 answers
0 votes
4k views
Fourier Transform of a Pulse Train (Frequency Comb Simulation)
0 votes

Let us first see the theory. By pulse train I guess you mean a periodic function from minus infinity to plus infinity. Your pulse train will have the Fourier series(FS) in stead of Fourier transform(...

View answer
1 answers
-2 votes
868 views
Fourier Transform for speech signal
Accepted answer
0 votes

You can take the samples of the speech satisfying Nyquist criterion. Say you got a vector of samples called x. spectrogram(x) would give you the short time Fourier Transform of x. fft(x) would give ...

View answer
2 answers
0 votes
503 views
Ideal reconstruction after down sampling
0 votes

The signal can not be reconstructed because in the new sampled signal the sampling theorem is violated. Aliasing would occur and the signal reconstructed would be a lower frequency than the original ...

View answer
2 answers
0 votes
1k views
Sample and reconstruct a real exponential (just one period)
-1 votes

How did you arrive at sampling frequency of 1000 Hz? Ideally speaking, you should find the Fourier transform of the given function analytically. This can be done using the FT tables for exponentials....

View answer
3 answers
17 votes
39k views
Meaning of Real and Imaginary part of Fourier Transform of a signal
-1 votes

Fourier transform of a system is its transfer function and gives the multiplication factor when $e^{j\omega t}$ is the input. $\omega$ is frequency. If you consider the input as current, the ...

View answer