# All Questions

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### How to compute Stockwell transform?

I am trying to implement Stockwell transform in MATLAB following the procedure given in link"http://www.sciencedirect.com/science/article/pii/S0378779605002646".I suppose multiplying the signal with ...
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### How to establish transfer function of a speaker?

I'm working on a signal processing project about vocal system, and I'm trying to use controlling theories to solve the problem. I need to get the transfer function, $H(s)$, of a speaker, from ...
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### Advantages of 2-VSB vs BPSK?

Both BPSK and 2-VSB transmit one bit of information per smybol and both modulate the real part of the signal. The difference is, as far as I understand, that BPSK does not modulate the imaginary part ...
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### Alignment of signals for ensemble averaging? Something else?

I have been applying ensemble averaging (adding signals of different trials to obtain one signal) to improve Signal to noise ratio in my data. I have achieved good results in terms of classification ...
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### Deriving impulse response from frequency response?

In Oppenheim's Discrete Time Signal Processing the frequency response is given by $$H_d(e^{j\omega}) = \sum_{n=-\infty}^{\infty} h_d[n]e^{-j\omega n}$$ then the impulse response $h_d[n]$ can ...
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### Measuring sharpness/contrast

For the implementation of an auto-focus for the raspberry cam I need some measure of image sharpness. I used the following sample picture: The first approach was to compute the shannon entropy of ...
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### LFSR in communication [on hold]

I need to use Linear Feedback Shift Register (LFSR) to generate random frequencies at which I will be shifting my signal. How can I do that? I don't understand when to choose which taps for a specific ...
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### Looking for a way to monitor raw microphone digital output?

This is sort of a cross between a data processing and Physics question, but I would be grateful if anyone here could help me. My objective is to calculate the sound pressure level (in dB) of a sound ...
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### Anti tremor motion detection

I'm programming in c# using opencv (emguCV). I use motion detection approach to detect some changes in a paper wall. For example it's may be colored by a laser pointer. My problem is that when I use ...
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### Converting poles/zeros to differential/difference equation solutions

Does anyone have a reference handy on how to convert poles and zeros of a system to differential/difference equations. Here is a quick draft of math, but I am not sure if it's at all correct. First, ...
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### What after image segmentation? [on hold]

I've read about different techniques to segment images. I tried the segmentation technique which involves clustering features extracted from a depth image (which includes position, color, depth). I ...
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### Question about MRI signal construction

As I understand it, in MRI, a line in k-space is usually acquired while the readout gradient is applied. So during the application of this gradient the protons spin at different frequencies along the ...
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### Frequency domain beamforming for 8 antennas and 4096 samples

I'm currently trying to write a Python program that beamforms a set of radar data I have. The data is from a system of 8 antennas where each antenna has a time series consisting of 4096 values. I ...
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### Mathematical justification for zero padding?

This question asks what's the point of zero padding. The accepted answer is certainly very insightful, but I don't understand a big chunk of it: Zero padding allows one to use a longer FFT, which ...
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### How do optical anti-aliasing filters work from a frequency domain perspective

To prevent aliasing, caused by the finite number of pixels on a sensor, a blurring filter is commonly used. How does that work from a frequency domain perspective? What is the transfer function of ...
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### Digital RF signal vector resize algorithm

I'm searching for an algorithm for resizing a RF sampled signal in order to draw it without losing any important maximum or minimum values. The values of the vector are negative/positive around zero.
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### Calculating Phase Response for 2 microphones given the input

I want to measure and compare the phase response of two identical microphones. To do this, I have a pressure chamber, which allows to apply the same pressure to both microphones. I apply a sweeped ...
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### Designing bandpass FIR filter MATLAB

I am trying to design a FIR bandpass filter for a STM32F407 microcontroller with a passband of 1kHz between 59500 Hz and 60500 Hz or something similar (since I don't really know how tight I can ...
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### Doppler frequency to radial velocity in a given bandwidth

given the Bandwidth of the signal (say 20MHz) and Doppler frequency ranging from -100KHz to 100KHz for the Auto Correlation 2D plot. Can somebody kindly explain me what is the radial velocity with a ...
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### Derivation of Bessel filters

I was reading Winder's Analog and Digital Filter Design and the section on Bessel filter. I was hoping to see a complete derivation of the Bessel filter theory, but Winder's book gives only \begin{...
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### Comparing the control performance of a given closed loop system

I am having a question about comparing the control performance of a given closed loop. In this link there are some characteristic values that need to be calculated, but there is no description of what ...
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### Bode plot of discrete-time transfer function $H(z)$

$H(z)$ is the transfer function of a biquad filter as described here. I would like to plot the Bode plot of the magnitude response of $H(z)$. Scipy has a bode method (...
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### Why is a linear phase important?

If symmetry conditions are met, FIR filters have a linear phase. This is not true for IIR filters. However, for what applications is it bad to apply filters that do not have this property and what ...
I'm trying to make an implementation of the Huggins Binaural Pitch illusion, which is where if you play whitenoise into each ear, but offset one ear by a period $T$ that it will create the illusion of ...