Signal Processing Stack Exchange
Signal Processing Stack Exchange

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Beginner Attempting FFT Signal Filtering With Numpy

I've tried looking around for information on this, but I'm really out of my league here. I'm a guy who likes to fool around with Python, and I wanted to make a program that would filter an audio file. I'm using Python and NumPy, with the…
SolarLune
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Differences between soft knee and hard knee in Dynamic Range Compression (DRC)?

I want to know more about where it is advantageous to use a soft knee and where and why a hard knee is preferred. Also I would like to get my hands on some good resources which talk about implementation of soft knee in DRC
Rishabh Gupta
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Why would I want to define a modulation index for each tone (DSB-FC)?

So the exercise is basically a signal $f(t)$ that is going to modulate the carrier $A\cos(\omega_ct)$ using a modulation index of $m=1$. I have to find $A$ and the power of the modulated signal: $$ f(t)=\cos(\omega_mt)+2\cos(2\omega_mt) $$ The…
user3680
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Why Runge-Kutta for Quaternion integration in Kalman filter?

I'm reading up on Kalman filtering at the moment. In particular, I'm interested in using the "extended" and "unscented" variants for IMU sensor fusion and calibration. In A comparison of unscented and extended Kalman filtering for estimating…
Benjohn
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Plotting DNA chromatogram trace data

Sanger DNA sequencing produces a chromatogram trace which can be visualized with a number of programs, including FinchTV or ChromasLite. The raw data consists of co-ordinates for each of the four DNA bases (A, C, G and T). However, plots are…
SabreWolfy
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3dB-Cut off frequency of moving average

I've read the thread: Cut off frequency of moving average And I use the second answer in my algorithm to calculate the 3dB cut off frequency of my filter, which works great, as my filter length is usually above 300. I verified it with the step…
Slev1n
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Relation between Laplace and Fourier transforms

I know that $$X_L(s) \Big|_{s=j\omega}=X_F(\omega)$$ if $x(t)$ is one sided and absolutely integrable and hence the imaginary axis of the Laplace transform is the Fourier transform. But Fourier transform also has imaginary and real parts. So how…
Vlad
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How to obtain impulse response from the differential equation of a system?

This year I'm having trouble with my Signals and Systems class. My major subject is Software Engineering and Electric and Electrical Engineering is my Minor. This question was my previous exam question but I coudn't write anything about it as a…
M. Jay
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What is the difference between MSE and PSNR of images?

I have some doubts. What is the difference between quality parameters MSE and PSNR? Which is used when? Is there any advantage of PSNR over MSE or vice versa? Also I have heard people saying that MSE and PSNR should never be used to check image…
Navdeep
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Relating bandwidth and wavelength of a carrier

This came from a homework question, which I've solved. Just need some clarification. I am asked to determine the bandwidth in a given amount of spectrum at a given wavelength. To find this, I know that; $$\delta_f = \frac{c\cdot…
Michael
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Kernel Convolution in Frequency Domain - Cyclic Padding

I don't know whether this is the right place to post this, but I suppose it is. I know that frequency multiplication = circular convolution in time space for discrete signals (vectors). I also know that "the convolution theorem yields the desired…
Johnny Pauling
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Is $x(t) = \cos t + \sin\left(\frac{1}{2}t\right)$ a periodic signal?

Is $x(t) = \cos t + \sin\left(\frac{1}{2}t\right)$ a periodic signal? The answer provided by the book is different from my answer. Book says its not a periodic signal. Can you guys tell me why is it not a periodic signal? My answer: $\cos(t)$ is…
Pranav Peethambaran
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What is averaging and how can it be done?

I'm studying about the analysis of (mainly) fMRI and EEG data. Multiple times it's mentioned that to reduce noise, you can use averaging, but nothing more detailed than that. There never is literally stated that you can use this or that technique to…
Mien
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Doppler shift in time domain?

I have some clarifications required in this topic So initially I know that to shift a signal $X(f)$ by $f_0$ we need to take its inverse fourier transform and multiply it with a factor of $\exp(−j2\pi f_0)$. Now as I understand it, in the frequency…
Avinash Suresh
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When did signal processing become a field of its own?

This is perhaps a bit soft question but when did signal processing become a field of its own? It would appear to have first been a branch of mathematics and statistics but then emerged as an independent field. If there is any book that would cover…
history
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