## Forums More comp.dsp

## tools for processing radio-signals

Hi all, I do not know if this newsgroup is still alive. I would like to learn to do "offline" signal-processing on radio-signals. E.g....

Hi all, I do not know if this newsgroup is still alive. I would like to learn to do "offline" signal-processing on radio-signals. E.g. consider that I have a wav-file or an iq-file that contains a recording of POCSAG (paging) message. What tools r python libraries can I use to exact the POCSAG message from it? I know there are python packages like scipy and numpy which would he...

## Distributed PDM decimating filter

Hi, If I use a typical I2S MEMS microphone (CMM-4030D-261-I2S for reference), the sample width is 24 bits per the datasheet. At, say, 44100...

Hi, If I use a typical I2S MEMS microphone (CMM-4030D-261-I2S for reference), the sample width is 24 bits per the datasheet. At, say, 44100 samples/second, the required digital I2S bandwidth would then be 24*44.1e3=~1.06Mbit/s. On the other hand, the PDM variant (say, CMM-4030DB-26354) requires clock frequency between 1 and 3.2MHz, with the 2.4MHz recommended value. That gives 2.4Mbit...

## Current ASICs

inIs there still a large market for dedicated DSP ASICs or is that being split into things like ARM chips and Nvidia chips now?

Is there still a large market for dedicated DSP ASICs or is that being split into things like ARM chips and Nvidia chips now?

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

in(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

inHi, 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

inI 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

inI'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

inUsually 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

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

inA 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

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