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Matlab FFT Reconstruction from Physiologic Frequency-Varying Signal

Started by BMEngineer in comp.dsp4 minutes ago 2 replies

DSP Experts, I am analyzing a physiologic signal that has a varying fundamental frequency. To create a more accurate reconstruction from the...

DSP Experts, I am analyzing a physiologic signal that has a varying fundamental frequency. To create a more accurate reconstruction from the FFT, I wish to include the bins immediately and symmetrically on either side of the fundamental bins. I refer to this as the "distribution method." I am confident I have been able to do a reconstruction using the fundamental bins (a standard reconstruct...


[ FAR off topic ;] Competent reporting of electric utility problem

Started by Richard Owlett in comp.dsp36 minutes ago 4 replies

I needed to ask a question of a *GROUP* who I trust and with which I have some credibility. I have a utility problem of some sort. I vainly...

I needed to ask a question of a *GROUP* who I trust and with which I have some credibility. I have a utility problem of some sort. I vainly attempted to have my "verbatim" problem description passed on to competent technical personnel. I've 3 years towards a BSEE and ~20 yrs as engineering tech &/or Jr Eng. What I observed was significant short term reduction of illumination pro...


Python question

Started by Tim Wescott in comp.dsp40 minutes ago 5 replies

Apropos to the question "Python for DSP" in comp.dsp (http:// www.dsprelated.com/showthread/comp.dsp/243722-1.php): How fully object-oriented...

Apropos to the question "Python for DSP" in comp.dsp (http:// www.dsprelated.com/showthread/comp.dsp/243722-1.php): How fully object-oriented is Python? I'm doing an app that really wants to be prototyped in something Scilab-ish (i.e., interpreted so it's easy to do graphs or computation on bits of it), but which is seriously challenging Scilab's sorta-object oriented-ness. I'm running...


Static library with -lm dumps core on run time

Started by Anonymous in comp.dsp2 hours ago 2 replies

Ubuntu 64bit on an AMD C50 dual core The c program was initially compiled using dynamic linking and tested fine. I statically linked it...

Ubuntu 64bit on an AMD C50 dual core The c program was initially compiled using dynamic linking and tested fine. I statically linked it with gcc a.c b.c -o myprogramEXE -static -lm and also by putting the full path the 3rd time. I also tested with ldd. When executing it dumps core on the same input conditions as with dynamic linking and on the same environment! Why - what is the fi...


FIR filter with initial conditions

Started by orrsarah in comp.dsp9 hours ago

Hey I am trying to write my own FIR filter in MATLAB for a project I am working on with the aim of eventually porting the project over to c...

Hey I am trying to write my own FIR filter in MATLAB for a project I am working on with the aim of eventually porting the project over to c (so I cannot use MATLAB built-in functions). The filter is taking smaller chunks of a large chunk of data and filtering them separately so I need to be able to set the initial conditions. Has anyone any idea how MATLAB uses the initial conditions, zi, inpu...


Python for DSP

Started by Max in comp.dsp1 day ago 33 replies

Seems that Python is catching on for some DSP work. The recent Coursera course co-sponsored by Julius Smith III used Python rather than...

Seems that Python is catching on for some DSP work. The recent Coursera course co-sponsored by Julius Smith III used Python rather than Matlab. I've searched for DSP libraries but there's kind of a confusing jumble. Some are just using SciPy. Does anyone know of specific Python libs that would extend SciPy's scope?


Adaptive PIDF under closed-loop

Started by adrianni in comp.dsp2 days ago 8 replies

Hi guys I know this not quite by the book of control theory, but i am looking into ways to implement an adaptive system onto my PIDF. Lets say...

Hi guys I know this not quite by the book of control theory, but i am looking into ways to implement an adaptive system onto my PIDF. Lets say (theoretical) that we dont have equations of state, hence we can't linearize the system around certain operating points. We can only do open-loop step response to estimate a optimal controller. The system is unstable and have complex poles. With that b...


Book recommendations

Started by Celdor in comp.dsp4 days ago 7 replies

Hi. I have asked this question on Stack Exchange in DSP section, as well. H= ope it is ok if I have copied this question here :) I am looking...

Hi. I have asked this question on Stack Exchange in DSP section, as well. H= ope it is ok if I have copied this question here :) I am looking for a good reference on DSP. I am a little bit more than begin= ner and have some experience in DPS. I think I would have to start with rat= her easier books where a concept of DSP is explained based on practical exa= mples, intuitively. Eventually...


SNR for ECG signal

Started by Jebarajpeter in comp.dsp4 days ago 12 replies

Hi all, I am working on baseline wander noise removal from ECG signal. I have to compare the performance of different algorithms. for comparison...

Hi all, I am working on baseline wander noise removal from ECG signal. I have to compare the performance of different algorithms. for comparison I have to use SNR. My question is how to calculate noise and signal power of an ECG signal available in the data set. I do not know what kind of noise is there in the ECG signal. I have tried like this: 1. Filter the ECG signal with a basic filter ...


ldd results on binaries from Ubuntu and its dependencies?

Started by Anonymous in comp.dsp5 days ago 6 replies

When I ran ldd on myprogeamExecutable and I got: linux-vdso.so.1 => (0x00007fff08709000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6...

When I ran ldd on myprogeamExecutable and I got: linux-vdso.so.1 => (0x00007fff08709000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f015360a000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0153245000) /lib64/ld-linux-x86-64.so.2 (0x00007f0153929000) I need to port this to a server. I am wondering how to meet these dependencies - I know the server is 64bit Debian


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