# Questions tagged [signal-processing]

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### Why do color TVs make black and white snow?

If you let a color TV display something from an unplugged display port, it displays snow, right? Randomly varying black or white pixels on the whole screen. My guess was that the television was ...
506 views

### Does a Faraday cage effectively act as a notch filter?

In reading about Faraday cages, I have found that most "real world" designs incorporate multiple layers of mesh. For example, this article from the National High Magnetic Field Lab discusses several ...
570 views

### Response of a system to a step function (Heaviside function)

I'd like to compute the response to a step function of a electrical/thermal system. Generally I can "easily" compute the transfer function $H$: $$H(\omega) = \frac{V_{out}(\omega)}{V_{in}(\omega)}$$ ...
159 views

### How can I filter out a signal while extracting only the desired one?

I know that my input signal contains a main sinusoidal signal, and I know its frequency but not its amplitude. Until now, I have been successfully using the least-squares method to generate a ...
62 views

### How were the tones for DTMF chosen?

In my limited engineering knowledge, and limited research skills, I couldn't find a complete answer for the reasoning behind the chosen tones for DTMF. I did find a hint that said something about ...
107 views

### Finding the sampling period to avoid loss of signal

We have: $$s(t) = 4u(t)−u(t−1)−2u(t−2)−2u(t−3.5)+2u(t−4)$$ where $u$ is the Heaviside function. I had to draw the graph and find the minimum sampling period so we wont have loss of signal. I have ...
129 views

### Arduino DAC to Speaker

I'm working with an Arduino Due's two DAC pins. I want to output to a single 4W 5.7Ohm speaker to test my code, with the intent of eventually outputting to a set of speakers (woofer, mid-range, and ...
24 views

19 views

### How do I calculate the delay of two signals from different sensors?

Suppose: I have two sensors attached to a vehicle I have recorded the output of these two sensors (for example GPS) during a test ride each sensor has a different frequency one sensor is way more ...
74 views

### Filtering Long-duration Signal

I have a long-duration EMG signal (~4 hours long) with a sampling frequency of 1 kHz. If I want to filter the data with a low-pass filter in 10 Hz in MATLAB, should I filter the signal with ...
24 views

### Finding force distribution using accelerometer data

The team I'm currently working for is trying to compare bushings with different durometer ratings in the front suspension using single axis(z) accelerometer data during curb impacts. The current ...
27 views

### How to determine data size created by sensor for calculation of signal processing and transmitting over wireless communication?

I want to build some sort of SAR sensor. Since radar works high speeds and creates loads of data this should be processed faster. I am trying to find algorithms to be used for this purpose. I am at ...
51 views

### classify ECG signal using neural network

I am looking to classify ECG signal using with neural network. I have never done signal analysis before. From the samples of data I have, I have noramlised, transformed using the FFT , get the pics, ...
447 views

### How to use VBA on Aspen Hysys? [closed]

I am trying to write a program on Aspen Hysys. Hysys has a script manager to write scripts using Visual Basics for Applications syntax. Having no background in VBA, I'd like some help to: Import the ...
29 views

### Why does Experimental Modal Analysis need a reference signal?

I need to conduct a vibration experiment with 3 accelerometers for a gear box. I'm reading the theory of mainly how to perform the vibration analysis but I don't understand why EMA needs a reference ...
133 views

### PED or DSP for mechatronic student [closed]

I am doing mechatronics engineering and i am to choose an elective module. We have the choice of taking up Digital Signal Processing or Power Electronics and Drive. Majority of my friends are taking ...
588 views

### Difference between Hysteresis, low pass filter and deadband in control theory?

I am trying to understand the fundamental difference between the following terms in the context of control systems: Hysteresis Low pass filter Deadband Are these just fancy names that can be ...
3k views

### How to get natural frequencies from accelerometer measurements?

I will be performing some tests and measuring the vibrations of a planetary gearbox. The accelerometer I will be using stays attached to the gearbox and saves the data into a log, which is available ...
198 views

### Is it possible to make a tunable coherent light filter with 1.8 nanometer bandwidth for visible light?

On January 1991, the esteemed Swedish professor of optics filed a patent titled "Coherence filter", that blocks coherent light regardless of laser light wavelength using destructive interference and ...
45 views

### how to filter model-free observations (e.g. Kalman filter)

Before asking a question, I have no background knowledge of engineering. So I have no idea about these issues like control or signal engineering. (Also, I'm not good at using English. sorry for that.) ...
36 views

### Operating a load cell below excitation voltage

I currently have this load cell, which has a 10V excitation voltage. However, there is a very nice/convenient load cell amplifier that works with an excitation voltage of 5 VDC. What are the ...
62 views

### dB/s/Hz in spectrum efficiency

Here is link of research paper in which spectrum efficiency is given in terms of dB/s/Hz. How can we define it? https://jwcn-eurasipjournals.springeropen.com/articles/10.1186/s13638-016-0792-0
37 views

### How can I find the Transfer Function in Z-domain?

This is my signal; $y[n]=x[n]+0.8x[n-0.2]$ When I take Z-transform I get; $Y[z]=X[z]+0.8z^\frac{-1}{5}X[z])$ Then I found the Transfer function as; $H[z]=\frac{Y[z]}{X[z]}$ $H[z]=1+0.8z^\frac{-1}{5}$ ...
7 views

### Why is it so hard to find DICOMs with Inversion Times recorded?

I've been searching for MR Images of anything that comes in DICOM format and have Inversion Time. I tried getting the Facebook fastMRI data set, the NIH Visible Human Project and the UTA4 Dataset and ...
12 views

### How is MRI SNR affected by the frequencies that are included?

So for MRI imaging, if an image is taken, and portions of the Fourier transform image are removed so that some portion of the higher frequencies are not included, would this reduce the SNR? I assume ...
10 views