why did Google Groups drop comp.dsp?

Started by Doctor Louis Pasteur in comp.dsp2 months ago

usually it is the gas-the-jews/lynch-the-niggers hate groups that get banned, or otherwise advocating suicide

usually it is the gas-the-jews/lynch-the-niggers hate groups that get banned, or otherwise advocating suicide


Recovering one irregular signal in the presence of another stronger one--_in utero_ pulse ox

Started by Phil Hobbs in comp.dsp4 months ago 3 replies

(I posted this in comp.dsp a couple of weeks ago, but most of the actual DSP people seem to have disappeared, so the discussion petered out...

(I posted this in comp.dsp a couple of weeks ago, but most of the actual DSP people seem to have disappeared, so the discussion petered out fairly fast. Trying again here.) Hi, all, Hoping there are still some DSP folks round here despite the evil Google ban. (But I repeat myself.) I'm working on a completely noninvasive sensor for fetal blood oxygen, using optical sensing throug...


Recovering one irregular signal in the presence of another stronger one--*in utero* pulse ox

Started by Phil Hobbs in comp.dsp4 months ago 6 replies

Hi, all, Hoping there are still some DSP folks round here despite the evil Google ban. (But I repeat myself.) I'm working on a completely...

Hi, all, Hoping there are still some DSP folks round here despite the evil Google ban. (But I repeat myself.) I'm working on a completely noninvasive sensor for fetal blood oxygen, using optical sensing through the mom's abdomen. It's a very low SNR measurement on account of all the attenuation. The mom's heartbeat modulates her pulse-ox signal, which is much stronger than the fe...


Variance of white noise

Started by Tom Killwhang in comp.dsp10 months ago 5 replies

I was reading Box and Jenkins Time series analysis and noticed that when they calculated power spectrum they had a factor 2 in the numerator -...

I was reading Box and Jenkins Time series analysis and noticed that when they calculated power spectrum they had a factor 2 in the numerator - see http://www.ru.ac.bd/stat/wp-content/uploads/sites/25/2019/03/504_05_Box_Time-Series-Analysis-Forecasting-and-Control-2015.pdf equation (3.1.12). I couldn't figure out where the 2 is coming from but then I wondered if they define noise a


BCH Encoding/Decoding

Started by Randy Yates in comp.dsp10 months ago 1 reply

I've notieced that in order to decode a page of in-band data, the linux kernel code first computes the out-of-band ECC bytes on the...

I've notieced that in order to decode a page of in-band data, the linux kernel code first computes the out-of-band ECC bytes on the given in-band data (calc_ecc). It is also passed the received oob data recv_ecc. If (byte-by-byte) the calc_ecc does not match the recv_data, then the page is decoded. Why not compute the decoded ECC and compute the locator vector/polynomial right off? Ar...


delta-sigma ADC in FPGA

Started by Rick C in comp.dsp10 months ago 11 replies

Usually when I ask about delta-sigma ADCs in FPGAs the comments are along t= he lines of "terrible idea", "can't mix analog and digital", etc. ...

Usually when I ask about delta-sigma ADCs in FPGAs the comments are along t= he lines of "terrible idea", "can't mix analog and digital", etc. I'm very= much not convinced. =20 I think people have a view of the ADC as being a device with very balanced = specs, resolution, SNR, etc. In this application we need significantly mor= e resolution than we do accuracy. The measurement is differ...


two dimensional chirp z-transform

Started by Yu Jiali in comp.dsp11 months ago

Hello All, would anyone please give me an illustration how to perform 2D czt in matlab? I use the row-column method used in normal fft to...

Hello All, would anyone please give me an illustration how to perform 2D czt in matlab? I use the row-column method used in normal fft to perform 2D czt transform on the Gaussian signal. amp=exp(-pi*(X.^2+Y.^2)/w0^2); tmp2=czt(amp,M,wx,ax); amp_f2=czt(tmp2.',N,wy,ay); The result doesn't make sense since Gaussian should remain as Gaussian after czt. Originally, I think the signal is ...


daily puzzle

Started by RichD in comp.dsp12 months ago 7 replies

A quickie. No diagram, but no need. Given a unit cube, vertices labeled ABCD on the top face, EFGH on the bottom; where A E, B F, ...

A quickie. No diagram, but no need. Given a unit cube, vertices labeled ABCD on the top face, EFGH on the bottom; where A E, B F, etc. Draw diagonals GD and BD, across the appropriate faces. What is the angle GDB? You have two minutes, no calculator, pen and paper only - -- Rich


Wiener Filter

Started by Tom Killwhang in comp.dsp12 months ago

...

https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-011-introduction-to-communication-control-and-signal-processing-spring-2010/readings/MIT6_011S10_chap11.pdf I refer to these notes. Ive been using Wiener filters for some time now but it is teh causal version. I am puzzled by the uncausal one because it is unstable. Therefore how do people manage to use it? Is


cetacean communication research

Started by David Dalton in comp.dsp1 year ago 3 replies

The Vancouver Canucks have the orca as their main logo. Unfortunately they recently lost their series against the Vegas Golden Knights. I...

The Vancouver Canucks have the orca as their main logo. Unfortunately they recently lost their series against the Vegas Golden Knights. I think they would have better luck if they donated more (or some?) money in support of the Southern Resident orca pods, maybe including some to me for research into cetacean communication :-) though that would require me to do some work (not that my four ...


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