# Tagged Questions

A discrete signal or discrete-time signal is a time series consisting of a sequence of quantities.

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### How to create and divide a signal envelope? Alternatives welcome

I'm very new to signal processing (still a student) and I'm trying to process a wav file in a certain way. I want to: Create an envelope of the signal (using absolute values of the amplitudes) ...
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### Why do we use discrete-time sampling?

I have been reading Signals and Systems (2nd ed.) recently. Chapter 7 is about sampling. Oppenheim uses discrete-time signals and continuous-time signals to explain sampling. But why do we need ...
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### SNR problem with different sampling rates using innerproduct

I'm trying to measure the amplitude of a sinusoidal component in a noisy signal. Since the signal frequency is known beforehand, I'm calculating scalar product with a sine and cosine base function ...
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### $\mathcal{Z}$-transform of $\frac{1}{n^2}$

This is a Question asked in IISC ( Indian Institute of Science,Bangalore,India) interview for MS admission. What is the $\mathcal{Z}$-transform of $\dfrac 1{n^2}$ ?
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### Is it possible compare 'the shape' of audio(voice) signal?

Here is an example: Record very low-tone voice guy saying, "Nice to meet you" Record very high-tone voice girl saying, "Nice to meet you" (they are saying almost same speed, it's like the second ...
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### What should be the correct scaling for PSD calculation using $\tt fft$

I would to calculate the PSD of a signal using FFT however the result do not match with periodogram command. What did was as follow : ...
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### How does scipy.signal.deconvolve work?

The deconvolve(signal, divisor) function of scipy ...
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### Signal enhancing algorithm (deconvolution??)

I need an algorithm (preferably Pascal-like, but anything else will do it also) that will make the "signal" (actually a series of data points) in left look like the one in right. Signal origin: ...
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### GCC-PHAT (Generalized cross correlation MATLAB)

I've been trying to implement generalized cross correlation with a PHAT weighting function for a while now, and cannot get it to work. I have tried correlating using MATLAB's xcorr.m file, and it ...
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### Is the filter described by specific difference equation time independent

Is the filter described by $$y[n] + 2 y[n-1] + y[n-2] = x[n] - 2 x[n-1]$$ time invariant? ($x[n]$ - input, $y[n]$ - output) Theorem of Foures-Segal says no (?) When I asked about Foures-Segal I ...
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### How to prove main-lobe side-lobe ratio in hann window is $-32\textrm{ dB}$?

I found that the value of the main lobe is about $N$, when I try to calculate the value of the sidelobe I got $0$, I assumed that the peak is at $\theta=\frac{6\pi}{N}$. How can I find the size of ...