Questions tagged [peak-detection]
The peak-detection tag has no usage guidance.
93
questions
1
vote
4answers
68 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
36 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
72 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
32 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 ...
0
votes
0answers
25 views
peak detection for stock data?
I am looking for some suggestions on what techniques to use for stock data. Specifically i am looking for some methods to both de-noise data, and then find ways to transform the smoother data into a ...
0
votes
2answers
593 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
66 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
64 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
43 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
63 views
0
votes
1answer
153 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
55 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
221 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
289 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
40 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 ...
0
votes
1answer
190 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
244 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
110 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
43 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
1k 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
167 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
60 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
151 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 ...
0
votes
1answer
342 views
How to get coordinates of complex RTL-SDR signal?
As I have already explained here (https://stackoverflow.com/questions/49358449/python-how-to-get-coordinates-of-complex-rtl-sdr-signal-peaks?noredirect=1#comment85722604_49358449), I need to find the ...
0
votes
2answers
544 views
Curved noise floor and ugly unexplained peaks after FFT
It has been so long since I studied this at University, so I'll better ask here if I'm doing something really wrong here.
I'm using a USRP frontend for L1 band surveillance. I want a 20MHz bandwidth, ...
0
votes
3answers
283 views
Extract breaths from respiratory signal, i.e. peak detection
I am trying to extract breaths from a respiratory signal, which is essentially peak detection. See the example below for what such a signal looks like. This particular signal looks rather clean, ...
1
vote
1answer
469 views
Harmonic Product Spectrum algorithm. I dont understand one step
I was looking some Harmonic Product Spectrum algorithm examples and I came up with this:
...
0
votes
1answer
924 views
Name of peak finding algorithm
I've been using this implementation of a peak finding algorithm and it works pretty well. I'm wondering if this particular algorithm has a name?
Python code:
...
2
votes
1answer
38 views
What does this block operator mean?
What does this block do? It's part of a block diagram for a RMS/Peak detector.
4
votes
1answer
8k views
Taking audio frequency and picking out peaks (Peak Detection)
So I have a unique challenge. I want to take an audio file, and pick out the peaks in the samples and plot that onto a graph. Each point based on the amplitude/pitch(?) will be represented as either a ...
1
vote
1answer
2k views
How do spectrum analyzers detect peaks?
Using peak search, I'm able to put the cursor on any of the several peaks on the spectrum analyzer display. I am trying to do something similar in software, with the output of the FFT of the radio ...
2
votes
1answer
209 views
How to detect peaks ignoring soft declivity?
I have to detect repetitions in a signal, and I am managing to do it by finding peaks and valleys, and cutting the desired pieces. The following figure shows the pattern wanted, shaded areas are the ...
1
vote
0answers
184 views
Cross Correlation shows peak at the same location every time
I have a signal which is taken from an accelerometer and I'm trying to match patterns between different windows of the signal by cross correlation. To do this I take different windows of the signal, ...
1
vote
1answer
204 views
How can I get the uncertainties for peaks on an image?
When pick the peak points on an image, e.g. the matrix made by peak in matlab as this one,
I can use max to get the index of ...
2
votes
1answer
279 views
Unexpected peaks in spectral analysis
I am doing the spectral analysis of some antenna recorded signals by computing PSD (logarithmic absolute value of the FFT) and the spectrogram of the signal. The problem is that I get some unexpected ...
2
votes
0answers
123 views
Peak detection for signals that contain high frequencies
I have an question about peak detection. My purpose is creating a plot with an impulse response and the decay line at / above it.
What I see till now is that there are two options for finding peaks:
...
1
vote
1answer
131 views
Detecting expected patterns in repeated measurements
I am new to signal processing and I am trying to learn myself. To understand what i am interested in, let me show this on example (note that this is just a random example to illustrate). Here is some ...
0
votes
1answer
540 views
Periodicity of peaks within a signal
I have a signal, in which i want to detect the period of the peaks, that exist within this signal: for example : After each 5mm or (5 seconds depending on the sampling rate and speed of my motor) i ...
2
votes
0answers
135 views
how to detect number of syllables in a batch of audio recordings?
I have a corpus of short speech samples from Kiswahili speakers, and I want to detect the number of syllables in each audio recording. How should I approach this task?
Background: I asked a ...
1
vote
1answer
1k views
DFT normalization for amplitude estimation
After an interesting recent answer, I'm doing some research on proper DFT normalization for sinusoidal peak estimation. It's clear that to get the correct amplitude from DFT peaks we need to normalize ...
1
vote
2answers
941 views
Getting a more accurate frequency read from autocorrelation and peak-detection algorithm
For a project I am attempting to create an automatic tuner for a guitar, which reads the audio from the guitar jack, determines the frequency and adjusts the string by a motor.
Using http://www....
1
vote
1answer
153 views
reducing MIPS in detecting tones
Currently our software is detecting tones using FFT and checking if there is only a single peak in frequency spectrum. Our software needs to know what kind of input it is before taking action. So we ...
0
votes
1answer
1k views
Finding peaks in an Audio spectrogram
I'm using gist.github.com/sixtenbe/1178136#file-peakdetect-py to find maximum peaks in my spectrogram.
I used
...
0
votes
1answer
195 views
Is there a relatively easy way to detect likely real-time peaks in discrete-time data?
Let's say I have a set of data over time, t:
[0, 4, 6, 7, 7, 6, 4, 0]
It seems likely that this data would peak at ...
2
votes
0answers
493 views
Peak detection techniques
I'm using a cell-averaging constant false-alarm rate (CA-CFAR) detector to detect peaks like the first one in the following plot:
The magenta line is the adaptive threshold, which is the local ...
2
votes
0answers
230 views
Absolute value vs. power (to make a signal positive-only)
In order to make a signal positive-only, I have the choice between taking the absolute value and multiplying the signal by itself (i.e. taking the signal to the power of two).
Obviously, multiplying ...
2
votes
1answer
2k views
MUSIC algorithm for peak detection
On Wikipedia, is written that
MUltiple SIgnal Classification (MUSIC) is an algorithm used for frequency estimation.
One purpose of estimating the spectral density is to detect any periodicities in ...
-1
votes
1answer
2k views
Wavelet-based C/C++ Peak finding libraries
What wavelet-based peak finding functions are there for C++?
I'm looking for something similar to:
http://docs.scipy.org/doc/scipy-0.15.1/reference/generated/scipy.signal.find_peaks_cwt.html. ...
0
votes
0answers
140 views
“Normalizing” PSD of unequal window lengths
I am acquiring time-varying data with unequal sampling (nature of the source). When building a spectrogram, I have the algorithm choose sample blocks that are are -nearly- the same length -but, they ...
3
votes
3answers
5k views
Good way to detect pulse with known width with background noise?
I'm dealing with a light sensor tracking a bursting LED. Unfortunately signal is weak and there are other light sources in environment. I've used optical filters on sensor but there is still some ...
