B.S. and M.S. in Electrical and Electronics Engineering, Ph.D. in Biomedical Engineering. Biomedical signal analysis, machine learning and image processing are the main interests.

Re: Generate a signal with linearly increasing Bandwidth

Reply posted 2 months ago (03/30/2020)
Can you check this

Re: Generate a signal with linearly increasing Bandwidth

Reply posted 2 months ago (03/30/2020)
or addding segments of gaussian white noises filtered with changing band pass filters could be tried also. You may check this.

Re: Generate a signal with linearly increasing Bandwidth

Reply posted 2 months ago (03/30/2020)
Hi, A simple way is to use multiple chirp generators. YOu can control the bandwidth with the "boundary" chirps and also can add chirps in between these two. YOu...

Re: Auto-Correlation based Carrier Frequency Recovery

Reply posted 3 months ago (02/29/2020)
Hi, Maybe filtering the signal for the strong tones before your algorithm could work ?

Re: Matlab Loop Construction ?

Reply posted 3 months ago (02/14/2020)
Hi RichardI am happy that I was helpful, although a bit late :) Omer

Re: Matlab Loop Construction ?

Reply posted 3 months ago (02/14/2020)
Hi,Actually I have always used Wavelet analysis for "off-line" analysis. Also the formulation of wavelet analysis somewhat requires whole data, think about the scaled...

Re: ADC and Complex Mixer Nyquist question

Reply posted 7 months ago (11/08/2019)
Hi Rick,Sorry, of course your Xc(m) is negative shift by fc (I stated sinosoids but missed total signal xc(t)-Xc(m)) My point was that as you have stated X(m)...

Re: ADC and Complex Mixer Nyquist question

Reply posted 7 months ago (11/07/2019)
Hi sachinwannabe,Assuming communications signal (?), I want to remind , a baseband signal of interest with a much low frequency content (Bandwidth) -compared to...

Re: ADC and Complex Mixer Nyquist question

Reply posted 7 months ago (11/07/2019)
Hi Rick,You say "Sequence xc(n) can have independent spectral components anywhere in the one GHz range of -0.5 Ghz -to- +0.5 Ghz.". Since we shift the spectrum to...

Re: Extract pitch of irregular signal ?

Reply posted 7 months ago (11/03/2019)
If you look at the tunelabguy's plots above, he confirms indeed fundamental frequency around 190 Hz and its 9 harmonics. YOur plot is also in this way, confirming...

Re: Extract pitch of irregular signal ?

Reply posted 7 months ago (11/03/2019)
Your plot also reflects peaks at harmonics of ~185 Hz.  380 Hz is one of them. (Fs=44100 Hz, good enough for resolution - not a reflection case here)

Re: Extract pitch of irregular signal ?

Reply posted 7 months ago (11/02/2019)
This is also a very nice approach, eliminating noise. I also found (also in this thread a sent) 380 Hz but there is a previous peak at 185-190 Hz. That is the desired...

Re: Extract pitch of irregular signal ?

Reply posted 7 months ago (11/02/2019)
I used autocorrelation (in Pyton, used librosa library) with the restriction that 120-240 Hz is the range for pitch find range.  import numpy, scipy, matplotlib.pyplot...

Re: Extract pitch of irregular signal ?

Reply posted 7 months ago (11/02/2019)
For human sound analysis, there are a lot of algorithms based on autocorrelation or frequency spectrum for "pitch estimation". spectrum.jpeg Looking at spectrum,...

Re: A question regarding MATLAB's 'invfreqz()' command

Reply posted 7 months ago (10/23/2019)
You are right Rick ,   b = [1 0 0 0 -1]  a = [1 -0.9]  freqz_points = 512  [h, w] = freqz(b, a, freqz_points);  [imp,t] = impz(b,a);  h(1) = sum(imp)  b_Order...

Re: A question regarding MATLAB's 'invfreqz()' command

Reply posted 7 months ago (10/22/2019)
Hi Mr Lyons,First value of h is NaN as I have checked. Maybe that is the reason?Edit: (As noted by anamariatome also, that is the problem indeed, pole at z=1(f=0) causing...
Yes, it was big news indeed. Engineers solve 50-year-old puzzle in signal processingan interesting comment".. The authors are applying for an international patent...

Re: Octave code

Reply posted 8 months ago (10/12/2019)
...
Hi,you may check this book;Noise Reduction in Speech Applicationshttps://www.cin.ufpe.br/~hama/Arquivos/Noise%20Reduction%20in%20Speech%20Applications.pdfa python...
I think this is more like a 'pattern search-matching. Once match is found, delay is to be computed.Edit: I meant of course stretching-shortening signal of interest,...
I also thought that but the signal to be searched has to satisfy wavelet criterion to be used in a wavelet analysis as a 'wavelet'. If he can find a similar wavelet...
very wise solution 

Re: Average Impulse Response from multiple measurements

Reply posted 10 months ago (08/10/2019)
Hi,If I were to do that, I would first check in time domain the similarities-differences of the impulse responses. Then in frequency domain, I would check differences...

Re: Fixed Point Library for Python

Reply posted 12 months ago (06/11/2019)
Hi,I use Python actively (forgetting even Matlab:) and found numpy/scipy libraries very decent and sufficient. Some info is here especially for DSP; https://docs.scipy.org/doc/scipy/reference/signal....Your...

Re: Estimating SNR in the Frequency Domain

Reply posted 1 year ago (03/22/2019)
Hi,Your updated version seems to calculate SNRs, I tried different f0 values. What was particular combination of parameters?

Re: Estimating SNR in the Frequency Domain

Reply posted 1 year ago (03/22/2019)
Hi, actually taking square values of the spectrum (sig_r_spectrum  = (sig_r_dft(1:NFFT/2)).^2)  is needed for finding powers, and multiplication by two is for...

Re: Auto Correlation in DSP processor

Reply posted 1 year ago (03/19/2019)
Hi,If you really need a real-time operation, you may try DSP processor based solution. But unless you need that, I suggest to use Octave/Matlab, Python based analysis/solutions,...

Re: Attn Linux Users: Check out Gambas

Reply posted 1 year ago (03/07/2019)
...

Re: Filter a rectified waveform?

Reply posted 1 year ago (03/01/2019)
HiStill you can apply rectify-Low pass filtering-ThresholdingYou may need to collect data to determine the threshold value. Also low pass filter cut off frequency...

Re: Matlab Loop Construction ?

Reply posted 1 year ago (02/28/2019)
Hi,Actually as fas as I have understood from your code, you are trying wavelet denoising, hence your question is related to the applicability of wavelet analysis...

Re: Filter a rectified waveform?

Reply posted 1 year ago (02/22/2019)
Hi,Actually it depends on noise type but first rectification and then applying low pass filter is better for thresholding purposes, as I have understood from your...

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