Questions tagged [signal-analysis]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
19 views

Bio-signal discontinuity after FIR filtering

I'm filtering respiration signal. I have a signal of duration equal to 10 minutes, so I decided to divided it into period of 10 s. I filtered each epoch with FIR filter, but I have discontinuities ...
0
votes
0answers
12 views

Python library for audio filtering, gating, and sound/silence detection

Is there a Python library that can do all of the following?: Band-pass filter; Noise gate, with different parameters set for different segments of audio file; Detect and count the number of discrete ...
0
votes
1answer
25 views

Equalization in CAR- Automotive Audio

Can someone tell me what is the purpose of CAR Equalization in audio and why before CAR Equalization ,gain adjustments are necessary ? Also why would someone use FIR filters during CAR Equalization ...
0
votes
2answers
26 views

Digital Signal Quantized Processor Complexity

In “traditional” digital signal processing, the complexity is computed as a number of multiplication the operation requires, e.g. the computation of the N-point DFT via the decimation-in-frequency FFT ...
0
votes
1answer
34 views

Balance Fader in Digital Amplifiers

What is the purpose of Balance / Fader in a digital Audio amplifier? In a signal flow what is the most apt position to place balance and fader(for example after before a compressor unit or at the ...
0
votes
0answers
29 views

How to solve this question on SSB modulation? [closed]

A message signal $m(t)$ has components at frequencies of 100, 200, and 400 Hz. It is SSB-modulated on a carrier with $f_c = 100 kHz$. The resulting passband signal $u_p(t)$ is demodulated by first ...
0
votes
3answers
122 views

There is an implant in me, is there a way to identify the frequency it is receiving signals on?

There is an implant in me, is there a way to identify the frequency it is receiving signals on? I don't want to share the evidence and my reasoning for believing there is an implant in me, you can ...
1
vote
2answers
46 views

Best temperature compensation equation?

I'm looking for the correct temperature compensation equation to use on our project. We are measuring the output of a detector who's signal is very sensitive to temperature drift. Any external ...
5
votes
2answers
90 views

What are the restrictions on DFT input sequences in order to produce valid spectral results

In a recent comment (as I understand it) our colleague OverLordGoldDragon’s stated that the only restrictions on DFT input sequences, to produce valid DFT spectral results, are that (1) the input ...
1
vote
0answers
41 views

Why we only can transmit a real signal? [duplicate]

i just wondering, why we always transmit a real signal but when we deal with a baseband signal we use a complex signal ? are this is related to up and down conversion of the signal (Because complex ...
10
votes
5answers
583 views

A DFT “periodic inputs” question

Why do people say that the fast Fourier transform (FFT) “views”, or “interprets”, or “assumes” its input sequence is periodic? I ask this question because the activities of viewing, interpreting, and ...
0
votes
2answers
32 views

Centre channel derivation using correlation

I would like to know the algorithm for how centre channel is derived from rejecting left and right channel in audio upmixing process. Can someone explain intuitively rather than hard hitting ...
4
votes
2answers
270 views

Geometric representation of a signal using basis functions

I'm trying to solve the following problem where I need to express $x(t)$ in terms of the given $φ_i(t)$ functions. (It is proven that the $φ_i(t)$ functions are orthonormal).: Here's what I tried: In ...
0
votes
0answers
27 views

Current fluctuations with reduced capacity

I simulate a neuron by compartments, where each compartment is represented by an electrical circuit. Myelinated nerves have reduced capacitance - so for example, if $n$ denotes the membrane layers, ...
1
vote
1answer
73 views

Envelop detection using matlab hilbert function

I am trying to detect the envelope of a high-frequency signal (similar to below) using Matlab Hilbert function This is my output It generally follows the envelope, but there is a high-frequency ...
0
votes
1answer
22 views

Indian Space Research Organization - Extent of spectral spread 1/3rd Octave Analysis [closed]

I am a scientist at Indian Space Research Organization (ISRO) and will be representing my team. We work on Telemetry and Data Handling units for our Launch Vehicles. We are preparing for our upcoming ...
0
votes
0answers
33 views

Example Contract for DSP Consultant

I'm an Electrical Engineer working as an independent consultant on applied research type DSP projects at small startups. Can anyone please recommend a good example contract to use with my clients? Are ...
0
votes
1answer
68 views

transform signal

Hello everyone I need help solving a Fourier transform for the given signal, I know it will be a frequency convolution for the first function it will be a window function and for the second function I ...
0
votes
1answer
39 views

Confused about the Fourier Transform of $e^{at}u(t)$

This is the problem at hand: I'm unaware of why we didn't have to say anything about $\omega$ like that it should be also greater than $0$, I know it's variable...but it's multiplied by $t$ ...
0
votes
2answers
52 views

Why plotting the fft result of a signal from -f to f gives different result compared to 0 to f?

When I plot the fft result of an audio signal on the positive side of frequency axis I get the following figure, I understand the signal on the right side of the Nyquist point is just a mirror image ...
1
vote
1answer
42 views

How to remove constant accelerometer velocity offsetting?

For quite some time I have been working on a project and got stuck recently with a problem considering integrating vertical acceleration from a legendary MPU6050 to get vertical velocity. What I have ...
0
votes
0answers
24 views
0
votes
1answer
44 views

Comparing two Accelerometer signals in time domain

As a research to answer my question, I've been reading several posts on this stack with a common thread of "comparing signals". The methods recurrently suggested were to use DTW, correlation ...
1
vote
0answers
20 views

Application of the spherical Radon transform property in tomography

Let function $f$ be even and continuous on the unit sphere $S^n$. Let $R$-be a spherical Radon transform. There is a known property: $R(f^n)=f$ whenever $f$=constant. What would this property mean in ...
0
votes
1answer
63 views

Digital Audio Amplifiers

Can anyone tell me why a filter that blocks DC signal in an Amplifier would have a cutoff frequency of 4 Hz . Why would someone choose a frequency as low as 4Hz to filter out DC content before ...
6
votes
8answers
2k views

What's the noise in this signal ? (Beginner question)

There is this raw ECG signal that I have obtained its frequency content in Matlab. The signal was sampled at 600Hz. The following is signal and the frequency content. I want to know what the ...
0
votes
1answer
33 views

Selecting the Nyquist rate for a combination of signals

If several sine waves were combined but each had a separate frequency, for example 10 Hz, 20 Hz and and 30 Hz, what would the required Nyquist rate be for analysis? From my research, it suggests that ...
1
vote
2answers
54 views

Understanding FFT for a vibrational analysis experiment

I am trying to understand how FFT works in order to measure the vibrations of a 3D printer. I will be doing this with an Arduino Nano and a MPU6050 accelerometer. In order to program the Arduino ...
1
vote
1answer
28 views

FFT/PSD/IFFT analysis on single axis piezoelectric accelerometer signals for curb impacts

I'm trying to denoise the signal by performing PSD analysis and followed by IFFT. Ultimately, I want to generate Force and Displacement plots from the denoised acceleration signal. Noisy Acceleration ...
0
votes
1answer
44 views

Question regarding sampling rate of sine wave

I am trying to determine my sampling rate, or the delay between each sample, but I am a little unsure if my math is correct. I have generated a sine wave f = 1000 Hz...
3
votes
1answer
50 views

Understanding LTI systems graphically

I'm currently working on this problem from Oppenheimer's book: Given $x_{1}(t)$ and $y_{1}(t)$ I should figure out $y_{2}(t)$ and $y_{3}(t)$ given that the system is LTI. My progress so far: I'm ...
0
votes
3answers
84 views

Is there processing gain for FMCW using heterodyne-style receiver as opposed to matched filter?

Beat signal of a single target will be a sinusoid in the idealized world, so theoretically the signal processing gain of an FMCW pulse correlated with Tx waveform in this way should be analogous to ...
0
votes
0answers
19 views

is there a single process/term to describe dissipation and amplification of a signal?

I am writing a paper, and the topic is about a signal that could be either amplified or dissipated while traveling through a medium. Since I don't wanna write everywhere "amplified or dissipated &...
0
votes
0answers
25 views

Generating new 2D data using power spectrum density function from spatial frequency domain via ifft?

This is my first post so apologies for any formatting related issues. I also tried posting in stackoverflow but I'm more optimistic that I might get a response here. So I have a dataset which was ...
0
votes
0answers
37 views

Breaking down sin wave to frequency domain causing weirdness in phase

I have tried many many different things and I cannot figure out why my phase is messed up. Here is what I am trying to do. I create a simple signal with a known wavelength, phase, and amplitude like ...
0
votes
0answers
19 views

How can I Improve my 2D Fourier Transform Graph?

I'm very new to signal processing. I have been tasked with running Fourier analysis on some velocity waves that I have found in a simulation. My supervisor would like me to plot the angular velocity ...
0
votes
1answer
42 views

How do I implement a footstep recognition algorithm? One that recognizes the start and end points of each footstep?

I have some time series data captured from a person's footsteps/strides (specifically, a person on rollerblades). It came from an IMU sensor placed on a person's boot. Each data point captures ...
0
votes
0answers
18 views

How can I make a piecewise signal from vertical matrix?

I want to write a general Matlab code to express this finite signal, x(t), in terms of elementary functions. I don't want code to plot it, I want a general code to extract (ramp and step) equation by ...
0
votes
0answers
14 views

Following a smoothing filter of a biological signal

)Following a smoothing filter of a biological signal. y[n] = Ay[n − 1] + Bx[n − 2] Please find the transfer function in the z-domain and find the impulse response function of this filter.
0
votes
1answer
64 views

bit reversed order of FFT matrix for channel estimation

Although the question seems similar to this one HERE, but what I want to ask about is little bit different. Assume we have a signal $X$ whose length is $N$x$1$, we convert that signal into time ...
0
votes
0answers
21 views

How to analyze medical image of a brain?

I have a small project to do on Image Analysis of a brain image signal. I have the following dataset. The total frame rate = 1500 and sampling time is 77 ms. What I need to do is, analyse the theta ...
0
votes
0answers
12 views

the amplitude-frequency spectrum and the phase-frequency spectrum of a coherent packet of radio pulse

Who can tell you how to draw the amplitude-frequency spectrum and the phase-frequency spectrum of a coherent packet of radio pulses?
0
votes
1answer
39 views

Echo generation of FIR system using Matlab

How can I generate some echo to the system below? Here is my code. I would appreciate any help. ...
0
votes
1answer
45 views

How up sampling of a signal is done in real world?

I know that up sampling by L means padding L-1 zeros between each samples. My question is how it is done practically? Do we use MATLAB or any other software, or there are hardware circuits to do so.
0
votes
0answers
28 views

convolution of two exponential signals with imaginary numbers

I can solve problems without imaginary numbers, but when exponential contain imaginary numbers, I can't solve the problem. For example, $x(t)=e^{3jt}+e^{4jt}$, $y(t)=(e^{-3t}-e^{-4t})u(t)$ (where $j$ ...
0
votes
2answers
47 views

Can I create my IF signal on SDR before bringing data to PC?

I'm relatively new to SDR's and I'm trying to determine what sort of BW I need for my laptop to get the best resolution possible for an FMCW system. I have an X310 Ettus with a UBX160 daughtercard ...
1
vote
0answers
63 views

Welch Method FFT Python - Scaling factor?

I've been implementing a Welch method FFT and I am trying to work out the correct scaling factor that should be applied to the output of the function so the PSD is accurate because at the moment it's ...
0
votes
1answer
32 views

Random function covariance

I was studying signal processing and I was frequently asked to verify if a certain covariance is possible for a given random function. I tried to check by verifying the property to prove it: ${γ}_{xx}(...
0
votes
0answers
21 views

Logic analyzer for acquiring EEG signals?

Is it possible? I haven't found anything about it on the internet. I found a logic analyzer here, which is marketed as having the capability to monitor analog signals too: "One useful feature of ...
-1
votes
3answers
54 views

Role of windowing in implementing FIR filters using Fast Convolution

In Fast Convolution the filtering is performed by taking FFT of both the signal and impulse response and multiplication in frequency domain using Overlap add/Overlap save method for processing ...

1
2 3 4 5
36