Questions tagged [array-signal-processing]
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28
questions
3
votes
0answers
35 views
How to compare imaginary coherence values?
High, I am currently writing my Master's thesis on susceptibility for hypnosis. I am comparing EGG signals of lowly and highly susceptible individuals.
The imaginary coherence is given by:
$$ \...
0
votes
0answers
18 views
Temporally synchronize two different or more real time digital audio signals
Are there any DSP techniques to temporally synchronize two different or more real-time digital audio signals without timestamp information?
0
votes
0answers
19 views
Angle bins for FFT DOA estimation
I have difficulties to calculate my angle bins.
After doing a fft over N points over the antenna elements I get N bins. For getting the angle of each bin I do the following:
f_bin = (2*pi)/N*n (n ...
0
votes
0answers
14 views
DOA Array Calibration
I'm transmitting a CW (fc = 1.66 GHz) and receiving it by an array of 4 antennas, all of them are sampled with a scope (fs = 10 GHz).
The array is rotated in several different angles (0,15,30,45,60 [...
0
votes
0answers
14 views
What features can be extracted from accelerometer sensor used for Structural Health Monitoring (SHM)?
I am using dataset found online for SHM which uses accelerometer sensor to detect changes in the structure. I know that I can transform the time-domain data into a frequency-domain and into a time-...
0
votes
1answer
15 views
Arbitrary shaped RIR generator
I wish to simulate some sound sources convolved with a Room Impulse Response (RIR) and impinging on a spherical microphone array. I could find a couple of generators online (such as this one), though ...
-1
votes
1answer
50 views
Is it possible to estimate the DOA from real samples only?
I'm sampling a ULA with a scope after transmitting a CW.
I'm wondering if I can estimate the DOA assuming I'm interested only
in the range [0,90] [deg] and not the full [-90,90] [deg].
The first issue ...
0
votes
1answer
36 views
The frequency-domain spectrum obtained using MATLAB's FFT function seems inaccurate
I am using MATLAB R2018b on a Windows 10 PC. In order to obtain the frequency domain information of a signal, I'm applying MATLAB's FFT function. The signal of interest is obtained from an experiment ...
0
votes
0answers
17 views
Bound on number of sensor for a minimal number of sources
Assume we have an $N$ microphone array. we record an audio scene with up to $M$ active sources in parallel. Is there a minimum bound on $N$ as a function of $M$? I am aware that different methods have ...
1
vote
2answers
94 views
Number of microphone limitation for Spherical Harmonics based DOA estimation
I am following this book "Theory and Applications of Spherical Microphone Array Processing", as well as this paper on DOA estimation "Eigenbeam-ESPRIT for DOA-Vector Estimation".
My dataset is ...
0
votes
0answers
20 views
DOA estimation of moving, radiating source in the near-field with nonuniform Doppler shifting
I am trying to estimate the DOA of a radiating source using two passive sensors.
In the case of a stationary source, I find the lag $k$ of the maximum in the sample cross-covariance sequence $E \...
0
votes
0answers
36 views
How to crop a song and mantain the same values in the sample vector?
Does anyone know how can I crop an audio signal and maintain the same values in the sample vector?
I am working on a audio signal processing project for song recognition in Python and I wanted to ...
1
vote
0answers
20 views
Blind source separation from microphone array
I was following this article and I wanted to "borrow" their Idea for my own work.
The difference is that I am using a microphone tetrahedral array and not a binaural microphone. I have two different ...
0
votes
2answers
66 views
Convolution property
Is the convolution of two equal signals the same signal?
I have this system:
and i have to find $h_1[n]$ (which i've been struggling for a while), given
$$ h_2[n] = u[n] - u[n-2] $$
and $h[n] = ...
4
votes
5answers
700 views
Multi-channel audio upsampling interpolation
I have a four-channel audio signal from a microphone tetrahedral array. I wish to upsample it from 48 kHz to 240 kHz.
Is there a preferred interpolation method for audio? Does cubic ...
2
votes
2answers
172 views
Tetrahedral microphone array beamforming
I have a microphone array of 4 channels taken as channels [6,10,22,26] from Eigenmike spherical microphone array. I wish to do 3D beamforming and create $8\times 4$ beams, 4-elevations with 8 ...
0
votes
2answers
131 views
Delay in Savitzky-Golay filtering
I am applying a Savitzky-Golay filter to a signal, using the scipy function.
I need to calculate the lag of the filtered signal, and how much is it behind the original signal.
Could someone shed ...
1
vote
1answer
51 views
By using array antenna and a MUSIC algorithm, how many targets could be detected?
By using an array antenna which has N receivers, How many targets could be detected and classified when we use the MUSIC(MUltiple SIgnal Classification) algorithm?
0
votes
0answers
162 views
Spatial smoothing - 2D MUSIC [FMCW MIMO radar processing]
I'm using a 2D Music algorithm for the estimation of Range-Azimuth info in a ULA FMCW MIMO radar. The algorithm procedure is pretty simple as per Belfiori F., Application of 2D MUSIC Algorithm to ...
0
votes
0answers
42 views
Space-time filtering vs. beamforming
Say I have a dense linear array of sensors in space and an acoustic signal propagating through them.
In this case, how would delay-and-sum beamforming compare to space-time filtering by masking the ...
1
vote
1answer
20 views
Feature normalization (scaling) for Hyperspectral images
have been straggling with the concept of feature normalization for the hyperspectral images. Respect to my problem I have attached a picture of my problem which clearly stands the issue which I have.
0
votes
0answers
33 views
Phase estimation in Beamforming
If I have a modulated signal $A\cos(2\pi f c t + \phi)$, I can demodulate it using IQ demodulator and estimate the phase using I and Q channel information. When it comes to MIMO case (specifically ...
1
vote
0answers
35 views
Excluding points too close to a set of coordinates
I was wondering if anyone can help me. My ultimate aim is to take an image like the one shown and draw line between the white and black blobs that show a direction and output the coordinates in the ...
1
vote
1answer
76 views
Separating two frequency component
How can we separate two frequency component when they get mixed means when signal get mixed with noise how receiver can judge which part is signal and which is noise ?
0
votes
1answer
31 views
How to make sinewives with array input, for-loop functions and operate array with others [matlab]? [closed]
Thanks to previous question, I got some clues to resolve this one.
But, I still get some problems here.
...
1
vote
0answers
270 views
Time-Delay beamforming delay computation
I'm trying to implement a beamforming algorithm in python and I'm stuck with the time-delay computation for a rectangular array.
I'm using the following equation to compute the delays based on the ...
-1
votes
1answer
135 views
Calculation of Correlation Matrix
In the description of any Beamforming Technique for microphone array signal processing there is a usage of the co-relation matrix.
What is the use of calculating such a co-relation matrix in such ...
9
votes
3answers
383 views
Practical wideband digital beamforming for large arrays in radar applications
I do understand the mathematics behind digital beamforming but I am not sure how such systems are practically implemented. For example, in a typical wideband FMCW radar operating in S-band, the (...
