## Forums comp.dsp

## 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...

## 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...

## zero padding and periodic waveform energy calculation

inConsider a 100 Hz waveform sampled at 10kHz. One period would consist of 100 samples. I'm trying to better understand the energy of this...

Consider a 100 Hz waveform sampled at 10kHz. One period would consist of 100 samples. I'm trying to better understand the energy of this waveform and the same waveform with 28 zeros. I'm asking because I see two equations pertaining to the energy of a periodic waveform. (1) is the summation of squares (2) same as 1 with the addition of multiplying the sum by the duration of the wavefor...

## FM SW Demodulated Audio - I get just noise

inHi everyone, this is my first post and it is quite important and urgent to me. I am new with this area so forgive me if I have some gaps in...

Hi everyone, this is my first post and it is quite important and urgent to me. I am new with this area so forgive me if I have some gaps in knowledge. I am trying to receive FM radio station (possibly the one with only voice) and play it on speakers. This is all done in Labview (thats mandatory), first NI board is used to downconvert 50 MHz of bandwidth from desired center frequency to...

## FIR filter bandpass filter from lowpass filter prototype

inI want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and...

I want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and i saw the freq. response of translated coefficient. but it differs from lowpass filter response. b = firceqrip(368, 4.3/(122.88/2), [0.1, 0.0018], 'slope', 0); fvtool(b); n=0:length(b)-1; cos_b = b.*(cos(((3*pi)/8)*n)); fvtool(cos_b) > lowp

## Basic Sampling Theory Question

inHi, If I have a sine wave with period T. The sampling theory says I can recover it by sampling at T/2. That is two points, barely enough to...

Hi, If I have a sine wave with period T. The sampling theory says I can recover it by sampling at T/2. That is two points, barely enough to draw a straight line. What am I missing here? --------------------------------------- Posted through http://www.DSPRelated.com

## 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

## FIR filter bandpass filter from lowpass filter prototype

inI want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and...

I want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and i saw the freq. response of translated coefficient. but it differs from lowpass filter response. b = firceqrip(368, 4.3/(122.88/2), [0.1, 0.0018], 'slope', 0); fvtool(b); n=0:length(b)-1; cos_b = b.*(cos(((3*pi)/8)*n)); fvtool(cos_b) > lowp