## Forums comp.dsp

## Analog error correction codes

inThere are 2 versions of analog error correction codes that I found. One is from the biological sciences:...

There are 2 versions of analog error correction codes that I found. One is from the biological sciences: https://clm.utexas.edu/fietelab/Papers/nn.2901.pdf It uses simple mapping onto phase space to do error correction. The second uses chaos theory to expand the state space: http://arxiv.org/abs/1105.1561 Neither of them give a really clear description of the decoding a

## CfP EvoMUSART2016

---------------------------------------------------------------------------- Please distribute (Apologies for cross...

---------------------------------------------------------------------------- Please distribute (Apologies for cross posting) ---------------------------------------------------------------------------- CALL FOR PAPERS EvoMUSART 2016 http://www.evostar.org/2016/cfp_evomusart.php 5th International Conference on Evolutionary and Biologically Inspired Music, Sound, Art and Design

## OT: Ariane 5 Launcher Failure

inFolks, I've been in a LinkedIn discussion in which the following analysis an Ariane 5 failure is documented: ...

Folks, I've been in a LinkedIn discussion in which the following analysis an Ariane 5 failure is documented: http://sunnyday.mit.edu/accidents/Ariane5accidentreport.html I'm just reposting it here since I find it fascinating, and I bet there are a few folks here (Tim, you come to mind especially) who might have a few things to say about it. I find it almost laughable (if it weren'...

## How to convert from PDM to PCM ?

inI have a client who is using a MEMS microphone (SPM1423HM4H-B, 3.125MSPS). The output of the microphone is a PDM...

I have a client who is using a MEMS microphone (SPM1423HM4H-B, 3.125MSPS). The output of the microphone is a PDM signal. Datasheet: http://media.digikey.com/pdf/Data%20Sheets/Knowles%20Acoustics%20PDFs/SPM1423HM4H-B.pdf In the client's test setup an emitter emits an acoustic signal. The emitted signal has frequency components around 40kHz. When I reviewed the client's setup, I noticed a c...

## Wireless communication and frequency band

inHello, I have a question pertaining to the frequency bands of carriers in wireless communication. So, when a two systems use two carriers of...

Hello, I have a question pertaining to the frequency bands of carriers in wireless communication. So, when a two systems use two carriers of two different frequencies, say 2.5 GHz and 5 GHz then I would expect that overall communication in system using 5 GHz would be faster as compared to system using 2.5 GHz. Of course, how fast is this would depend on where the bottleneck is in terms of co...

## ARM CMSIS: arm_cfft_q15() roundoff errors

inHi, Sanity check here. Using ARM arm_cfft_q15() with 512 length. Seeing noticeable roundoff errors. For a simulated input pure sine wave (first...

Hi, Sanity check here. Using ARM arm_cfft_q15() with 512 length. Seeing noticeable roundoff errors. For a simulated input pure sine wave (first harmonic) the magnitudes of the first nine FFT harmonics look as follows: Input H1 10 bits: 11.3 5.7 0.0 5.7 5.7 5.7 2.0 4.0 5.7 Input H1 1000 bits: 992.0 5.7 2.0 5.7 7.2 5.7 5.7 5.7 5.7 Input H1 ...

## OFDM(doppler shift estimation)

inHey there everyone! I'm actually right now researching about ofdm based realization to efficiently estimate the doppler shift and I've kinda run...

Hey there everyone! I'm actually right now researching about ofdm based realization to efficiently estimate the doppler shift and I've kinda run into a block In the typical block diagram there's a IFFT/FFT block,I've read on many forums but I'm unable to determine the significance of the said block Also,if its possible could anyone help me understand why actually circular convolution is better ...

## Datasheet Question

inSection 7.2.1 on page 11 in this PDF: http://cache.freescale.com/files/sensors/doc/app_note/AN4076.pdf describes how to convert a 14-bit...

Section 7.2.1 on page 11 in this PDF: http://cache.freescale.com/files/sensors/doc/app_note/AN4076.pdf describes how to convert a 14-bit value into a decimal fraction, but I'm not sure I understand it so I'm hoping that somebody in this group could take a look at the PDF and tell me if my interpretation (see below) is correct? 1. Read in first byte (8 most significant bits) denoted MSB ...

## Discrete -Time Fourier Transform

inSo from what I searched in the net, DTFT is the continuous Fourier transform of a discrete (or quantized?) signal while DFT is the...

So from what I searched in the net, DTFT is the continuous Fourier transform of a discrete (or quantized?) signal while DFT is the discrete Fourier transform of the quantized signal. Meaning DFT is used in actual Systems since it gives out data which can be processed by computer. If that is the case, what is DTFT for? Is it used in actual systems or just used for mathematical proving and analysis?...

## Minimization / maximization problem

inHi all, I need some hint or pointer in order to try to solve a problem. This might not be the right place, but since here wise people are,...

Hi all, I need some hint or pointer in order to try to solve a problem. This might not be the right place, but since here wise people are, maybe I got lucky (I tried sci.math too). If you know an other possible NG, please let me know. I've a set of vectors, same size, these are "samples" of different populations, of course I've by far more vectors than populations. These (column) vect...