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Questions tagged [time-domain]

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Can Autocorrelation be used to Differentiate Signal Quality (High, Medium, Low, Very Low) for Periodic Signals?

I'm working on a project to classify the quality of periodic signals into four categories: high, medium, low, and very low (noisy). I was initially exploring autocorrelation as a potential feature for ...
Mamad Fasih's user avatar
1 vote
0 answers
27 views

What is the analogy of frequency sampling of a 1D signal in a 2D signal (image)?

I made model to remove noise using deep learning for 1D ECG signal (time-amplitude domain). The model was trained on 360 Hz frequency sampling ECG data on millivolts unit. I stated to my professor ...
Muhammad Ikhwan Perwira's user avatar
1 vote
1 answer
126 views

How to find impulse response for the given system?

How can I find the impulse response for the following system in time domain? I actually would like to find my mistake in my attempt. Below is what I have tried according to the answer given for this ...
Lars Smith's user avatar
2 votes
1 answer
48 views

Impulse response synthesis in the frequency domain

Background - Create context I am trying to synthesise some impulse responses to simulate an active noise control system. I have already formulated the problem in the frequency domain so now I want to ...
ZaellixA's user avatar
  • 1,314
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0 answers
98 views

Signal plotting on a paper

I needed help in plotting this in a paper, I have 2 signals: x(t) = 4 Tri ((t + T) / 2T) x(t) = sin((2 pi t)/ T).rect((t - 3T) / 2T) I have added my solutions to these signals in the attached image, ...
Wireshark's user avatar
1 vote
2 answers
154 views

Poles and Zeros in Time Domain

I was looking at this forum: A question about the meaning of pole in time domain, and I still have some doubts about the time domain input that would lead to a pole or zero. Let's say I have this TF $$...
BambaMentality's user avatar
0 votes
2 answers
88 views

How do I isolate a part of this signal in time-domain in Matlab?

I want to isolate a reflection part of a signal which I've transformed from Frequency to Time-Domain (see Picture). So far, I've tried to create a Hamming-Window with the specific window-width for the ...
Anne-Mary's user avatar
1 vote
2 answers
36 views

Accumulative Value Difference in Adjacent Intervals

im trying to implement eq. 14 of this study, but im not sure how to set an interval in python. The equation is $sumAD[k]=sumA[k] - sumA[k+1]$, where $sumA[k]=\sum_{i=1}^{N} a[i]$. N is the total ...
Tom's user avatar
  • 131
4 votes
0 answers
85 views

Recover the first half of the time-domain signal of the N-point frequency domain signal using an N/2-point FFT

Let X be an N-point sequence in the frequency domain (where N is a power of two): $$ X = (X[0], ..., X[N-1]) $$ where $X$ is the complex and conjugate symmetric forward DFT of the real sequence $x = (...
keith's user avatar
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0 answers
59 views

Detection of pattern in Time Waveform Data

I'm working on building a system which can detect such patterns by some methods excluding any statistical or frequency domain analysis techniques. How to detect such repetitive pattern for any faulty ...
Sandipan Das's user avatar
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0 answers
26 views

Advice for first steps in time domain simulations

I am reaching out because I’ll soon have to tackle signal processing questions that were so far handled by colleagues of mine. I come from the macroscopic link budget computation world in a satellite ...
Sycropane's user avatar
1 vote
1 answer
44 views

Filter a 1D time series taking advantage of accuracy values for every data point

I have an assignment on a time series that contains the x positions of a point in space. This series comes with another one of the same length, where every element goes from 0.0 to 1.0 and represents ...
ThePirate42's user avatar
0 votes
1 answer
113 views

Filtering in time domain vs filtering in frequency domain

The signal is an impulse repsonse. I am filtering the signal using a windowed sinc filter in both frequency and time domain. I am interested in knowing the differences between the two methods and ...
Tanmayee Pathre's user avatar
4 votes
1 answer
199 views

Applying Lowpass filter on a signal in time domain gives ringing artifacts - how to get rid of them

EDITED AND UPDATED: My signal is an impulse response. In the following figure: The frequency spectrum of the impulse response (original signal) is shown by blue line. The original signal is ...
Tanmayee Pathre's user avatar
3 votes
0 answers
78 views

Improving the Time Domain Normalization of Acoustic Sound Data

I have tried to evaluate the analog microphone (IMP23ABSU) built into the STEVAL-STWINKT1B with the FP-SNS-DATALOG1 (HS-Datalogger). The values were exported as "raw values" (this is an ...
Tom's user avatar
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0 answers
97 views

Sampled data plot doesnt make sense

I've measured an accoustic signal for approx. 90 seconds with a sample frequency of 192 kHz (Note: the used device can sample data with maximaly 192 kHz, therefore i am not 100% certain, what sample ...
Tom's user avatar
  • 131
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0 answers
167 views

Decreasing gibbs phenomenon with window functions multiplied in time domain

I know about using fitering(e.g. window filters that used in frequency domain), wavelets for decreasing or even full eliminating gibbs effect but don't really understand how we can use window ...
Alexander's user avatar
0 votes
1 answer
114 views

Time-varying shot noise generation

I'd like to model the behavior of photodiodes, the input is like data bits (0 & 1) where each bit is represented maybe with 100 samples / bit and the bit rate is $B$ bits/sec with period $T_{bit}=\...
Mohamed Osama's user avatar
0 votes
0 answers
49 views

control system : time domain analysis

This is the question. According to this, when we solve for transfer function we will get $20/s^2+5s+24$. but this is not the correct format as numerator should be equal to the last term, i.e., 24, in ...
stuti's user avatar
  • 1
0 votes
0 answers
52 views

Relationship between the derivative of a time-stretched signal and its original derivative

Suppose we have a time bounded original signal f(t) where f is nicely behaved, for simplicity we can restrict it to a polynomial. The crux of the problem is that its analytical form is unknown, we ...
Emanuel Hristea's user avatar
1 vote
1 answer
1k views

Why is the convolution of two sine waves a sinc function?

Problem/Question After taking the convolution of two discrete sine waves of the same frequency and length the result appears to be a sinc function but I was expecting to get a sine wave since this ...
Usman Mutawakil's user avatar
2 votes
0 answers
108 views

Scaling for windowed differentiator FIR filters

I recently took a dive into DSP and I was wondering what the appropriate scaling factor for a wide-band differentiator is. Let's derive the impulse response of such a differentiator. $$\begin{aligned} ...
link's user avatar
  • 21
0 votes
0 answers
171 views

How to plot a sawtooth chirp waveform using an array of frequency and time for an FMCW radar?

Before switching to use sawtooth I was using sine wave but in sine wave high frequency content was not clearly visible, But I don't have any experience with using sawtooth waveforms. I am going to ...
Raj Patil's user avatar
0 votes
2 answers
447 views

Is it possible to predict the peak value of a time-domain signal from its frequency-domain spectrum?

As the question states, is it possible to predict the peak value of a time-domain signal given its frequency-domain spectrum? Since the time-domain signal is just the sum of the individual sinusoids ...
Darcy's user avatar
  • 296
0 votes
1 answer
47 views

Normalize the output signal that may be as similar as possible the input

I'm having a problem to normalize my output signal (extracted EEG signal) after applying Independent Component Analysis (ICA) that may be as similar as the original source (EEG signal). I need do this ...
Văn Sư Hồ's user avatar
1 vote
1 answer
79 views

Need to make audio human listenable

I wrote some golang code which implements 3Blue1Brown's Hilbert's Curve: Is infinite math useful? ... give the code an image and it returns back its audio equivalent ( inverse Fourier Transform ) ......
Scott Stensland's user avatar
0 votes
0 answers
101 views

Help with real-time TD-PSOLA - sounds very very bad

So I have a pretty robust and fast pitch tracker I've been working on based on this thesis. I want to use it for real-time pitch shifting. However, one of the simplest algorithms for formant-...
Gabriel Golfetti's user avatar
3 votes
1 answer
366 views

Short time energy or root mean square?

What is the difference between Short time energy(STE) or root mean square(RMS), Librosa library offers a function to calculate RMS but doesn't offer one to calculate STE, which gives the impression ...
Ahmad's user avatar
  • 33
1 vote
2 answers
281 views

time-domain response to continous linear chirp

I am investigating the time-domain response of electromagnetic waves. The input signals are a chirp with linear frequency sweep 2.5 Hz->4.5 Hz -> 2.5 Hz and another signal which is abruptly ...
Reza Afra's user avatar
1 vote
0 answers
185 views

IFFT confusion, sampling frequency

I made a previous post about what I am trying to do Previous Post I have band-limited data in the frequency domain from a VNA and I am trying to convert it into the time domain. VNA data saved in .s2p ...
Frank's user avatar
  • 33
1 vote
1 answer
136 views

Impulse response of an LTI system

I want to find the impulse response of the linear time invariant system given by $y''(t)+4y'(t)+3y(t)=x'(t)+2x(t)$ using time domain analysis. As solved in the textbook "Continuous and Discrete ...
kobaltishblue_312's user avatar
2 votes
0 answers
25 views

Time domain frequency "loudness" isolation

There is a very useful tool in my DAW which allows me to isolate groups of "loudness" within the frequency domain. Basically, any bin greater than some min, less than some max. It makes it ...
Seph Reed's user avatar
  • 305
0 votes
1 answer
746 views

Constellation Mapping In OFDM

If i am not mistaken, the two following hold : a. In OFDM Conceptualization, the constellation mapping at Tx (or de-mapping at Rx) is done in Frequency domain b. However the basic theory (Including ...
Vinayak Anant Karandikar's user avatar
2 votes
1 answer
133 views

What is the name for the technique of comparing a time domain signal to an expected signal with a sliding window?

I was trying to think about how to do time-domain analysis of a real-valued signal to determine if it contains a particular carrier. I can obviously just compute an FFT, but that transforms a window ...
Eric Urban's user avatar
1 vote
1 answer
355 views

How can I check similarity of two different sinusoidal waveform model?

I am trying to establish a similarity index for two different signals. These signals are quite different in amplitude and signal length. Their waveform is sinusoidal, and frequencies are at a close ...
LunaLOVEGOOD's user avatar
1 vote
0 answers
25 views

Resampling a signal with variable frequency [duplicate]

I haven't touched my signal processing courses for a long time and I forget how to work with these kinds of signals. I have a signal that comes from a sensor that has 3 time periods. The time vector ...
Caretaker2995's user avatar
0 votes
1 answer
47 views

If I have this discrete time sinusoid composed of a sine and a cosine, how do I find its period?

$$ x \left[ n \right] = 3 \sin \left( 4 \pi n \right) + 2 \cos \left(0.36 \pi n \right), ~~~ 0 \leq n \leq 100 $$ The fact that my signal is composed of both sine and cosine makes it tricky for me.
bob's user avatar
  • 1
2 votes
3 answers
186 views

Algorithm to detect down-up-down pattern in time series

I'm trying to write an online algorithm in Python to detect this below Down-Up-Down pattern in time-series. It's not hard to do roughly if I calculate 3 contiguous non-overlapping moving averages, and ...
Jase's user avatar
  • 163
0 votes
0 answers
70 views

Analytical derivation of convolution and multiplication implement of time-domain signal

I have a system model as shown in figure 1. I want to change the model to a new schematic as in figure 2. How to analytically derive the filter $H_2$ if all parameters are known? I guess that we will ...
user190055's user avatar
2 votes
3 answers
254 views

FIR filter phase response at fs/2

I am currently building a FIR filter based on frequency sweeping data (0 Hz to Fs/2), i.e., transfer curve in frequency with the sampling rate of Fs. The phase response is shown in the following ...
user190055's user avatar
0 votes
1 answer
736 views

Multiplication in frequency domain for a signal containing a whole frequency spectrum

Imagine we have two signals in the frequncy domain X(f) and H(f), for one of the signal H(f) I have the complex pair and the frequncy at which that complex pair exists. The second could be any random ...
Novice_Developer's user avatar
0 votes
0 answers
123 views

Low pass filter behavior in frequency domain

I have a relatively simple task, which is to implement a low pass filter for a sum of exponentially dampen complex sinusoids in random Gaussian noise. To showcase my problem I have generated data ...
mabso's user avatar
  • 1
1 vote
1 answer
770 views

How to estimate the delay in time domain when knowing the phase shift in frequency domain

I am strugling with how to compute the exact value of delay in time-doamin when knowing phase shift in frequency domain. I have a analog circuit, I sweeped about 30 single tones frequency ranging from ...
user190055's user avatar
1 vote
0 answers
927 views

Getting envelope of noisy signal

I am analyzing some interferometry data and have a time signal that looks like this: Our temporal resolution is unfortunately not enough to resolve the fringes. I need to get the upper envelope of ...
Regulus's user avatar
  • 11
0 votes
1 answer
50 views

Impulse Response Formula

How can you determine the impulse response if you know the output of the system? You should change the input signal with the dirac function with the argument equal to $t$ or $t-\tau$? I have this ...
Royolh's user avatar
  • 21
0 votes
0 answers
345 views

Frequency filtering in the frequency domain vs. time domain

As a DSP newbie, I've stumbled into doing band pass filtering (of pre-recorded IQ data) in the frequency domain - which allows brick wall filtering (I'm just setting the IQ values of each consecutive ...
Rob's user avatar
  • 31
1 vote
1 answer
90 views

How to sample a signal in time based on a set of relaxation times?

How fine should you sample in time (and what should the range be) when calculating a spectrum based on some relaxation times ("modes" in physics, not sure about signal processing). I have ...
user avatar
0 votes
1 answer
581 views

How to interpret ADEV plot?

I want to understand how to interpret ADEV plots. I was of the understanding that if we see a peak at 1sec of TDEV plot there is a 1Hz noise in Time Interval Error(TIE) Capture. To understand the ...
arun's user avatar
  • 17
0 votes
2 answers
913 views

Converting signal to frequency domain then back to time domain - noise issue

I am trying to convert a signal into frequency domain using fft then construct a time domain signal (with any length) from the frequency response. With my matlab code, it works fine when there is no ...
pakornpp's user avatar
0 votes
0 answers
125 views

Should I use IQ data or power data to compare 2 signals through `similaritymeasures.dtw`?

I choose similaritymeasures.dtw to compare experiment signal exp_sig and reference signal ref_sig. Both signals are I,Q data ...
kittygirl's user avatar
  • 175