## Forums comp.dsp

## Matlab FFT Reconstruction from Physiologic Frequency-Varying Signal

inDSP 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...

## FIR filter with initial conditions

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...

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

inI 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 for DSP

inSeems 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

inHi 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

inHi. 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

inHi 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?

inWhen 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

## Qpsk Demodulator

inI implemented a qpsk demodulator on NI fpga . When i run the code iam getti= ng correct constellation one out of 4 succesive runs remaining...

I implemented a qpsk demodulator on NI fpga . When i run the code iam getti= ng correct constellation one out of 4 succesive runs remaining times const= ellation is rotating as shown in fig url: https://decibel.ni.com/content/se= rvlet/JiveServlet/showImage/105-32337-135325/Constellation.jpg . q1. what are the possible causes for constellation rotation?

## questions on convex hull

inConvex sets have become important in numerical optimization, so I'm trying to edjicate myself. Given some subset of points in a vector...

Convex sets have become important in numerical optimization, so I'm trying to edjicate myself. Given some subset of points in a vector space, one must first determine its convex hull. For a set of points on a plane, this is easy to visualize However, I don't see how to write the code to accomplish this. Now suppose you have a set of vectors in a 6-D space. The convex hull w...