Load disturbance sensitivity function in control loops

Started by Anonymous in comp.dsp3 months ago

Hi, I'm a bit confused about the load disturbance sensitivity function in control loops. Basically, I have a design where the load disturbance...

Hi, I'm a bit confused about the load disturbance sensitivity function in control loops. Basically, I have a design where the load disturbance sensitivity function has a maximum of 5 at a frequency of 300 Hz. I'm not sure I understand this metric correctly. Does it mean that a load variation of 10% at a frequency of 300 Hz would create a variation 5 times higher on the output? The formula...


Why does it say "Toeplitz matrix, so we only need to calculate the first row and column of the matrix"?

Started by fl in comp.dsp3 months ago 4 replies

Hi, I know Toeplitz matrix has the same value along its diagnose line. I think the first row value gives all the value of the Toeplitz matrix,...

Hi, I know Toeplitz matrix has the same value along its diagnose line. I think the first row value gives all the value of the Toeplitz matrix, why the author said in his way. /////////////// Toeplitz matrix, so we only need to calculate the first row and column of the matrix Thanks for reading


DCT in video compression

Started by RichD in comp.dsp4 months ago 17 replies

The mp3 standard uses the discrete cosine transform (DCT), rather than the full DFT. Doesn't that imply throwing away half the...

The mp3 standard uses the discrete cosine transform (DCT), rather than the full DFT. Doesn't that imply throwing away half the information? Can anyone explain this? -- Rich


Counter and length of count

Started by Anonymous in comp.dsp4 months ago 5 replies

Somebody check the sums which was fun working out. I have a sensor which gives out 4096 pulses per revolution. This is attached to a motor...

Somebody check the sums which was fun working out. I have a sensor which gives out 4096 pulses per revolution. This is attached to a motor which turns at 1000 rpm. I need to count by using an integer in increments defined by a signed 64 bit integer. The question is, how long can it count for at this speed before the integer overflows? 64 bits is about + or - 9.23 x10^18 count in on


FFT Beamforming

Started by JanMichica in comp.dsp4 months ago 6 replies

Hi, Im an undergraduate student and I have researched how to estimate the direction of arrival of a signal using a FFT. I understand how to use...

Hi, Im an undergraduate student and I have researched how to estimate the direction of arrival of a signal using a FFT. I understand how to use it and how to implement the algorithm, but im unsure as to why when performing an FFT on spatially separated data this yields an angle? Thanks, Jan


How to use IFFT to get the system impulse response?

Started by antenna404 in comp.dsp4 months ago 15 replies

Hello all, I have got the system transfer function of a two port network in frequency domain,the frequency range is from 2Ghz to 12GHz.IFFT is...

Hello all, I have got the system transfer function of a two port network in frequency domain,the frequency range is from 2Ghz to 12GHz.IFFT is used to get the time domain impulse response,but the result is complex ,not real.The impulse response of a system should be real.So,please give me some suggestions.thanks .


Implementation of gain scheduling for PI controllers

Started by Anonymous in comp.dsp4 months ago 11 replies

Hi, I'm designing a controller for a boost converter. I'm able to find a set of gains that fit for all situations, but I get a slow response at...

Hi, I'm designing a controller for a boost converter. I'm able to find a set of gains that fit for all situations, but I get a slow response at full-load. I was thinking instead of using gain scheduling, 1 set of gains for little to no load and 1 set of gain when load is significant (say more than 25% of the maximum load). Now my question. What are the gotchas about gain scheduling? In bo...


origin of "Bracewell interpolation"?

Started by Anonymous in comp.dsp4 months ago 2 replies

I can across a really old Fortran program with a subroutine that interpolates a 1D array of N samples to 3N samples. It uses a 5-point operator,...

I can across a really old Fortran program with a subroutine that interpolates a 1D array of N samples to 3N samples. It uses a 5-point operator, and the comments describe it as Bracewell method, spline approximation to sinc. I haven't seen this before. Bracewell's 1995 book on Two-Dimensional Imaging had a formula for 6 nearest points. Did he publish a formula for 1D interpolation with 5 po...


Microsoft is not the answer

Started by Anonymous in comp.dsp4 months ago

Microsoft is the question the answer is no!

Microsoft is the question the answer is no!


my geophysics CV

Started by David Dalton in comp.dsp4 months ago 3 replies

I just updated the Microsoft Word and PDF versions of my CV on my home page to reflect the fact that I got a Ph.D. at the end of May and to list...

I just updated the Microsoft Word and PDF versions of my CV on my home page to reflect the fact that I got a Ph.D. at the end of May and to list five new papers, but haven't yet updated the HTML version so I just deleted that for now. The direct link for the PDF version is http://www.nfld.com/~dalton/dalton-cv-web-2019.pdf Constructive criticism is welcome. Also I have put my Ph.D...


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