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Signal Processing : Recent Questions and Answers (Page 9)

Find answers to your questions about Signal Processing or help others by answering their Signal Processing questions.

How to derive 2nd order Butterworth condition for the damping coefficient mathematically?

The magnitude of 2nd order low pass filter is given as$$|H(omega)|^2= frac{1}{(1-(frac{omega}{omega_o})^2)^2+(frac{2zetaomega}{omega_o})^2}$$Now in order to achieve maximally flat within pass band, we take the derivative of this...

Asked on 10/24/2021 by Yihan Hu

1 answer

LDPC for channel coding

I am working on OFDM over harsh channel, so the channel coding is an essential thing for achieving a reliable communication. According to my reading, LDPC is almost the best...

Asked on 10/24/2021

1 answer

Fast calculation of normalization factor for normalized cross correlation

There has been a number of posts here I've browsed through that explain implementations of normalized cross-correlation in Python. One such implementation that is frequently cited is found below.def...

Asked on 10/24/2021

0 answer

Are there any tools for generating fixed point filter implementations?

It's very easy to make a filter in Scipy or many other tools, but implementing this filter in fixed point in C or VHDL/Verilog is always a chore. I mean,...

Asked on 10/24/2021 by Pepijn

0 answer

FFT shows systematic deviations from analytical result

I am calculating the numerical Fourier transform of an exponential decay exp(-|t|) and compare it to the analytically calculated result, a Lorentzian. I find that the numerically calculated spectrum contains...

Asked on 10/24/2021 by Sebastian Busch

1 answer

Reconstructing audio from a given spectrogram and phase data

I have 2 seperate files called: spectrogram and phases. Spectrogram contains magnitude information of audio and phases contain the phase information of each windowed area. I need to reconstruct the...

Asked on 10/24/2021 by Norffas Cricket

3 answer

Intuitive explanation of subspace

There are many techniques in signal processing that use eigen analysis (MUSIC, SVD, eigen decomposition, etc) that result in signal and noise subspaces.The mathematical definitions for signal subspaces are abundant,...

Asked on 10/24/2021

3 answer

Determine a sequence whose N point DFT is given without computing inverse

For example, I'm given a sequence x(n) = { 3, 5, 1, 4, -3, 5, -2, -2, 4 } whose 9 point DFT is X[k]. Without computing IDFT, i need...

Asked on 10/24/2021 by my_knee_Hertz

1 answer

Determine constant $A$ such that $x[n] = x[n] star x[n]$

Let $x[n] = Adelta[n] - frac{sin(frac{3n}{2})}{pi n}$. Determine constant $A$ such that for all $n$ $$x[n] = x[n] star x[n] tag{1}$$ I think it's not possible...

Asked on 10/24/2021

1 answer

Digitalization of a signal

Suppose I have an analog signal I want to transmit. After sampling and quantization, I can map the samples to bits. So now I have a bit stream that represents...

Asked on 10/24/2021

1 answer

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