Questions tagged [peak-detection]
The peak-detection tag has no usage guidance.
120
questions
4
votes
1answer
47 views
How to automatically identify the start and stop times of a "ramp" seen in time series?
I am analyzing pressure data sampled at 1Hz. The times series exhibit "ramps" (a linear increase in pressure followed by a sudden drop) for which I would like to automatically detect the ...
0
votes
1answer
27 views
localization with TDOA under Doppler shift
In a localization system, I use the TDOA (Time Difference of arrival) method. The transmitter is moving at a speed v and its communication signal is received on 3 receivers at different times. For a ...
3
votes
3answers
450 views
Easy way of calculating peak to peak voltage of an AC voltage wave
I want to measure the peak to peak voltage of an AC voltage signal. The voltage itself is around 220V and 60Hz. When measured through a sensor connected to an Arduino, it is scaled down to, let's say ...
0
votes
1answer
31 views
Beep Signal for Latency Calculation
I want to play audios on two mobiles with sync. But mobile phones are not in sync. I am trying to find two Mobile phones playing latency so I can pad latency on each phone so they can play together. ...
0
votes
0answers
26 views
Peak Sharping of multi-signal data
I have multi-signal data and as a processing step want to apply peak sharping of signal as shown in fig below.
is there any way I can achieve this in python ?
Literature :Paper 1(Peak sharping section ...
2
votes
1answer
51 views
Why is peak of the signal taken as the Time Delay
I was reading this research paper titled 'The generalized Correlation Method for Estimation of Time Delay' by C. Knapp and G.C. Carter. They develop an ML estimator and in the introduction mention ...
0
votes
0answers
37 views
Peak detection in noisy waveforms
I have a set of 1-dimensional time-series, a subset of which contain either one or two peaks, and the remainder of which are pure noise. I've smoothed these data by ...
4
votes
0answers
153 views
Extracting audio segments based on detected onsets using libROSA
I have a couple of .wav sound files with very similar percussive signals of ~60ms duration. I can identify their onset times using libROSA's onset detection quite well. I would now like to extract the ...
0
votes
0answers
30 views
Peak detection for signals with increasing peak frequency
Given a signal where peaks appear with increasing frequency, what is the best way to do peak detection? Each hill in the image should correspond to a single peak. If I try to smooth out the signal I ...
2
votes
1answer
65 views
How to determine if certain notes exist within polyphonic music?
Given a segment of audio, if you were to calculate the histogram of frequency amplitudes for all standard musical note frequencies present in the audio, how would you check to see if 2-3 specific ...
3
votes
2answers
59 views
How to check if a signal is mainly composed of a few impulse peaks?
I am working on a problem that produces different types signals, and I need to detect the peaks after low-pass filtering, then find_peaks from ...
2
votes
2answers
85 views
(Radiation) Pulse detection and height characterization when pulses are stacked
Edit: Title
Edit2: Clearer picture of low count rates.
Edit3: Added 2nd sentence for context.
Edit4: Added deconvolution attempt
I've been looking at some scope traces I took of radiation. This is a ...
0
votes
1answer
45 views
Beat detection and calculation of start time
Beat detection
I'm trying to create a beat detection function of a machine producing in the language R. I hosted the audio file on dropbox.
It was recorded with 16 bit and 16kHz. I started with some ...
0
votes
1answer
76 views
Spectral peak location estimation using complex DFT
In this paper a simple method to estimate a spectral peak is proposed, by using quadratic interpolation between three samples of the DFT of the signal. Namely, the position of the peak relative to the ...
1
vote
0answers
37 views
estimating peak frequency close to bin zero
Given a half complex spectrum (positive frequency bins from DC to Nyquist) as the result of a real FFT, to estimate the true (non integer) peak frequency I usually rely on Eric Jacobsen's estimator:
$$...
1
vote
1answer
87 views
What are some really accurate ways to get the value of a peak (local maximum) given some points around it? (To be used for autocorrelation peaks.)
I have looked everywhere on the internet for this and, surprisingly, haven't found much useful information.
Given 3 or more points closest to a peak (local maximum) what are some of the most accurate ...
0
votes
0answers
44 views
Box function signal filtering in python
I am trying to produce a box function filter of a signal in python. I expected to find this functionality in scipy.signal, but I can't find any solutions. What I am trying to do is this.
I have 2 ...
1
vote
1answer
214 views
Why is peak detection in chromatography not completely automatic?
When I started to write a software for chromatogram processing I naively thought I'd find some existing algorithms that do all the peak detection automatically and there won't be a need for any manual ...
0
votes
1answer
28 views
Dimension error using findpeaks function in Matlab on Power Spectral Density to calculate SNR of audio data
I have a set of audio files for which I would like to determine a SNR metric. I tried to implement in Matlab as follows:
...
1
vote
2answers
161 views
Multiple peaks in a same signal?
I am working on peak detection in different signals, the signal plot looks like this:
After applying peak detection algorithm and tuning it for each signal, final output looks like this:
As you can ...
0
votes
1answer
59 views
Using Neural Network for locating shifting resonant frequencies
I have multiple FFT's taken from a sample at different pressures, through different analysis I can see that the resonant frequencies are shifting in the spectrum for each FFT at a different pressure.
...
1
vote
0answers
104 views
Frequency Estimation Using Multiple Signal Classification Algorithm (MUSIC)
I'm working on side research that deals with signals and data in the time domain. currently, I want to use the multiple signal classification algorithm (MUSIC) which is mainly used for frequency ...
0
votes
1answer
122 views
How to determine a suitable threshold when using amplitude thresholding method for spike detection?
I have seen number of approaches that have been introduced in the literature for spike detection including, amplitude thresholding method, Nonlinear Energy Operator method, and template matching ...
0
votes
0answers
32 views
Filtering out symmetric noise from an oscilloscope reading
I have a signal that looks like this:
The data is readings from two oscilloscope channels, one color coded blue, the other color coded orange. I would like to filter out the supply noise (all the ...
0
votes
0answers
26 views
Extracting time-tagged pulses from Geiger audio recording
I am doing some tests with SmartGeiger detector designed for smartphones. The sensor unit sends pulses via phone microphone jack input and the app does the counting and calculates the values.
However,...
0
votes
1answer
242 views
How to find correlation between two signals regarding peaks?
In a super-resolution task, I try to predict the higher frequencies of a signal.
X low-resolution (lr) is my input and Y high-resolution (hr) is the target. Where X contains only frequencies till 2 ...
0
votes
1answer
49 views
Detecting peak value on realtime IMU data stream
I'm using Qt C++, QCustomPlot to read and display realtime value from an IMU. This is how I set the realtimeDataSlot:
...
0
votes
3answers
278 views
How do you do signal averaging on a realtime data?
Smoothing algorithms implemented by me
Exponential smoothing - https://www.openprocessing.org/sketch/771368
Moving Mean - https://www.openprocessing.org/sketch/540696
For example - a1+a2+a3+a4+... ...
1
vote
5answers
567 views
How to detect overlapping peaks in FFT?
I am working with a modular spectral processing STFT toolkit I have written in C. I often need to carry spectral peak detection and analisys (frequency estimation, peak displacement, etc) but I am ...
0
votes
1answer
136 views
How to measure algorithmically side lobes in real data
I want to measure algorithmically the following parameters in a given FFT data (real numbers).
peak side lobe levels
side lobe levels
side lobes nulls
The following image illustrates parameters I ...
0
votes
2answers
332 views
Envelope reconstruction algorithm for audio processing
I need to reconstruct the envelope of a sound.
Audio data are professionally-recorded natural sounds (speech, bird songs) with very little noise. I would prefer working in the time domain rather ...
0
votes
0answers
50 views
Detect Trigger in vibrational data
I'm trying to classify states with a 1D-CNN-Network structure. Therefore I need to analyze the incoming vibrational data in a certain window. Two examples of such signals are shown below.
I'm ...
3
votes
3answers
3k views
How would you use machine learning for peak detection?
I have a noisy signal and I'm trying to find a way to detect peaks with ML. The "peaks" are easy to find as human because they are rhythmic and have the same "general" shape but the amplitude and ...
1
vote
0answers
119 views
Robust peak detection taylored for spectroscopy
i need a algorithm for peak detection in raman spectroscopy. I tried this one, but it did not give me satisfying results.
Spectrums may look like this:
In professional software, i think they use the ...
1
vote
2answers
182 views
Filtering Surge Signals
I am working on a matlab program which needs me to detect the pattern of surges in a signal and then remove them. I tried out various filters like median, hampel, butterworth etc. but couldn't get an ...
0
votes
0answers
53 views
What exactly does up triangle \land symbol mean in the context of peak detection?
Folks, I'm reading this paper: User Adaptive QRS Detection Based on One Target Clustering and Correlation Coefficient, and have a question about notation.
In describing peak-detection, they use the ...
1
vote
1answer
88 views
0
votes
1answer
619 views
Time delay estimation between two complex signals(IQ)
I need to time align two complex signals. The two signals obtained were at different RF frequency before digitisation. So,I have two complex signals(IQ) and I need to do delay estimation and apply ...
1
vote
0answers
147 views
Extracting signal from data using Otsu thresholding in MATLAB?
I am very new to signal processing. I am trying to extract a signal from my data using otsu threholding but it's not fully accurate. In this case I know that there is going to be a single signal in ...
1
vote
1answer
511 views
Filtering and peak finding
I have an observed signal which is the norm of the sum of two 3-vectors:
$$
S(t) = || \mathbf{A}(t) + \mathbf{B}(t) ||
$$
Now, I have full knowledge of the vector $\mathbf{A}(t)$,
$$
\mathbf{A}(t) = \...
0
votes
2answers
751 views
Detection of sharp peaks in an audio signal
I have an audio signal and I'm interested to detect the very sharp peaks.
If I zoom, here is something that should NOT be detected (this is voice actually):
NO GOOD
Here is something that should be ...
0
votes
0answers
54 views
Peak Analysis vs Machine Learning
I am unsure about which approach is "better" (less time good accuracy) for classifying gestures:
The system is a doppler radar that returns I and Q signals
Approach 1:
Have several subject perform ...
1
vote
2answers
496 views
Threshold for peak detection of noisy signal in frequency domain
I have a noisy signal (Gaussian Noise) with a known SNR and known Noise variance.
This signal contains a number of Frequency components.
My ultimate objective is to detect the components of the signal....
3
votes
4answers
414 views
Estimate peak width from a vector that is a superposition of unknown number of identical Gaussian peaks with different heights?
If you have a vector that is a superposition of an unknown number of identical Gaussian shaped peaks/impulses of unknown width (but all the same width) and different amplitudes (with Poisson or ...
3
votes
1answer
212 views
Chromatogram peak detection - bunching vs others?
Reading presentations from existing tool providers I noticed that in order to detect peaks they first use bunching (average N points) and then use slope and curvature to detect peaks. I'm guessing ...
0
votes
1answer
45 views
How to differentiate an empty aerosol from a full one using only sound measurements?
The challenge I have is to detect an empty spray container using sound measurements only, since I can't place any sensor directly into the container because of the mechanism that tightens it.
My main ...
0
votes
1answer
3k views
Checking for VHF pulse with SDR and python
So I have a small NooElec Software Defined Radio and I've got it working well with my Raspberry Pi using GQRX as a controller and to visualize the SDR output.
My goal though is to use a python script ...
0
votes
1answer
260 views
Peak Detection Of Every Pulse
I have this signal as the following figure:
Now, I need to know each beginning index of each pulse as described in the following figure:
I have tried to detect the peaks through obtaining the cross ...
0
votes
2answers
114 views
What should I do with FFT result array from microphone input? [duplicate]
I currently want to create a small pitch detector and I have to say that I am very new in this topic of signal processing.
At the moment I implemented the FFt algorithm and I got an array of window ...
0
votes
2answers
230 views
Pitch detection of two following music notes (C0 and C0#)
Hi signal processing community,
currently I am working on a pitch detection tool which should work on audio input files (or later also instrumental or voice from microphone) to say which music note ...