Anyone using Linux?

Started by Eric in comp.dsp5 hours ago 51 replies

Just curious about how much Linux is being used for embedded DSP apps. If you're using it, what are your normal development tools?

Just curious about how much Linux is being used for embedded DSP apps. If you're using it, what are your normal development tools?


Shannon and Sphere Hardening

Started by Tim Wescott in comp.dsp13 hours ago 14 replies

So, I'm toying with Shannon's capacity theorem, trying to graph out the "sphere hardening" effect that he cites as the basis of the...

So, I'm toying with Shannon's capacity theorem, trying to graph out the "sphere hardening" effect that he cites as the basis of the principle. I can see, intuitively, how the whole notion that the volume of a sphere is concentrated in a thin shell works, but when I try to calculate actual numbers I start running into numerical difficulties at dimensions of around 150 or 200. Even wit...


Using the convolution of two rectangular signals to test a block convolver.

Started by Les Cargill in comp.dsp3 days ago 11 replies

To test a convolver, a rectangular train of pulses can be convolved with ( a copy of ) itself to produce a triangular pulse. So suppose I...

To test a convolver, a rectangular train of pulses can be convolved with ( a copy of ) itself to produce a triangular pulse. So suppose I have two quantities related to rectangular pulses: - Buffer size - number of pulses possible. The "10" in "float pulse1[10]" is the buffer size. Call this BufferSize. - The length of the rectangular pulse. This much be


Why is Dolph-Chebychev windowing relatively obscure?

Started by Eric in comp.dsp4 days ago 17 replies

Most software seems to focus on Hann, Hamming, and Blackman windowing. From the graphs I've seen, Dolph-Chebychev appears to outperform...

Most software seems to focus on Hann, Hamming, and Blackman windowing. From the graphs I've seen, Dolph-Chebychev appears to outperform them: https://en.wikipedia.org/wiki/Window_function#Dolph.E2.80.93Chebyshev_window Anyone know why it isn't featured in DSP texts to the extent of the other windows above? Are there drawbacks?


Windowing: Resolution vs dynamic range

Started by Eric in comp.dsp5 days ago 11 replies

Wikipedia has an informative page on Window functions. See this paragraph for context on dynamic range vs resolution: ...

Wikipedia has an informative page on Window functions. See this paragraph for context on dynamic range vs resolution: https://en.wikipedia.org/wiki/Window_function#Windowing The second part of that paragraph references tradeoffs between dynamic range and resolution. I'm assuming that the reference to 'dynamic range' means 'difference between center peak and nearby lobes', This woul...


Sorry about the many posts

Started by Michael Plet in comp.dsp7 days ago 62 replies

Hi Group I'm sorry about posting all my formulas without any delay. I just wanted to get them out there while they are new, so that...

Hi Group I'm sorry about posting all my formulas without any delay. I just wanted to get them out there while they are new, so that other people can use them if they want. Michael Plet


Stepper motors or servos?

Started by Anonymous in comp.dsp1 week ago 14 replies

I saw a real fast one armed robot. I was wondering if stepper motors was used or closed-loop control. I know NC machines use stepper motors but I...

I saw a real fast one armed robot. I was wondering if stepper motors was used or closed-loop control. I know NC machines use stepper motors but I heard the torque isn't as good as dc motors.


Time Scaling - An iterative approach

Started by Michael Plet in comp.dsp2 weeks ago 5 replies

Hi Group Here is a method of time scaling that you may or may not have heard of. I have used it a few times and like it. Normally time...

Hi Group Here is a method of time scaling that you may or may not have heard of. I have used it a few times and like it. Normally time scaling (change of duration without changing pitch) is done using STFT. That is overlapping DFT frames. In order to time scale, different amounts of overlap is used for analysis and synthesis. If a frame size of N, an analysis hop size of Ra and a sysnt...


Question about Gaussian window and parabolic interpolation

Started by Michael Plet in comp.dsp2 weeks ago 39 replies

I have done some experiments with a Gaussian window applied to real signals. The signals were pure sinusoids of a fixed frequency...

I have done some experiments with a Gaussian window applied to real signals. The signals were pure sinusoids of a fixed frequency and phase. I used this window: w(k) = e^( -(1/2) * (k - (N-1)/2)^2 / (a*(N-1)/2)^2 ) with N=32, k = 0, ..., N-1 and a = 0.265391249974779 I multiplied my signal with the window and did the DFT. Then I calculated the magnitudes around the peak. I took the...


"Maker board"

Started by Steve Pope in comp.dsp2 weeks ago 37 replies

I've recently seen in job listings, contract requirements etc. references to desiring engineers who are "experienced with Maker boards". What...

I've recently seen in job listings, contract requirements etc. references to desiring engineers who are "experienced with Maker boards". What exactly is a Maker board? I gather it's not a brand name, but some general concept ... it sounds a little new-age or something. Is there a specific meaning? Steve


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