Adaptive Filter | ADPCM | ADSP | ADSP-2181 | Aliasing | AMR | Anti-Aliasing | ARMA | Autocorrelation | AutoCovariance | Beamforming | Bessel | Blackfin | Butterworth | C6713 | CCS | Chebyshev | CIC Filter | Circular Convolution | Code Composer Studio | Comb Filter | Compression | Convolution | Cross Correlation | DCT | Decimation | Deconvolution | Demodulation | DM642 | DSP Boards | DSP/BIOS | DTMF | Echo Cancellation | Equalization | Equalizer | ETSI | EZLITE (Ez-kit Lite) | FFT | FFTW | FIR Filter | Fixed Point | FSK | G.711 | G.723 | G.729 | Gaussian Noise | Goertzel | GPIO | Hilbert Transform | IFFT | IIR Filter | Interpolation | Invariance | JTAG | Kalman | Laplace Transform | Levinson | LPC | McBSP | MIPS | Modulation | MPEG | Multirate | Notch Filter | Nyquist | OFDM | Oversampling | Pink Noise | Pitch | PLL | Polyphase | QAM | QDMA | Quantization | Quantizer | Radar | Random Noise | Reed Solomon | Remez | Resampling | RTDX | Sampling | Sharc | TI C6711 | Undersampling | Viterbi | Wavelets | White Noise | Wiener Filter | Windowing | XDS510PP | Z Transform

Re: burst by burst synchronization in 802.11a system.

eric.jacobsen@ieee.org (Eric Jacobsen) wrote in message news: ... > On 25 Aug 2003 05:32:58 -0700, santosh.nath@ntlworld.com (santosh > nath) wrote: > > > Hi all, > > > > I have some doubts. I hope somebody can clarify. > > > > It is related to burst by burst synchronization. We...

Re: Phase-selective filters

Jerry Avins wrote in message news: ... > Rune Allnor wrote: > > > ... > > > > The problem is to extract the "mutual component" S from the data, given > > no other information than that the signal is measured by both recievers > > R1 and R2. If S and Sn are known to be narro...

Re: Frame sync for OFDM under multipath environment

wongchichian@hotmail.com (wong) wrote in message news: ... > Hi > Would like to know how to do frame synchronization in OFDM systems. > Seems like many folks like to correlate a copy of what is received > with a delayed copy of itself, but this method is not robust esp in > the presence o...

Re: How to implement a fast correlation ?

Guillaume Couriot wrote: > Hello All, > > Does anybody could recommand how to perform a fast correlation between to > stereo signals. > > The regular implementation is consumming a lot of CPU.... > > Thanks for any answers. > > Guillaume. If you mena cross correlation, f...

Re: coherent signal vs correlated signal

Randy Yates wrote in message news: ... > Chia C Chong wrote: > > > > Hi! > > > > Can I know what is the difference between "coherent signal" and "correlated > > signal" ? > > > > Cheers, > > Chia-Chin > > Hello, > > As in math, I think the best place to sta...

Re: optical orthogonal codes

"TOM" wrote in message news: ... > Gil: > > By optical codes, I assume you mean codes for optical transmission > (i.e. by fiber). > > The main problem is optical receivers (PIN diode or APD diode detector, > combined with a baseband amplifier) is that they do not respond...

Re: Why minimising in the mean-error sense.

Rune Allnor wrote: > > > I would stay away from spectrum divisions. If I understand you correctly, > you have a system like > > Y(f) > Y(f) = H(f)X(f) => H(f) = ------ > X(f) I have the equ...

Cross Correlation Definition

My (1st) edition of Oppenheimer and Schafer defines the crosscorrelation of stationary signals x and y as: rxy(k) = E[x(n)y(n+k)*] whereas Matlab defines it as rxy(k) = E[x(n)y(n-k)*] (See http://www.mathworks.com/access/helpdesk/help/bugfixes_12.shtml#fix47) Which is correct? They ...

Cross Correlation

I am looking for a program which calculates cross correlation and auto correlation any help please? ...

Re: Coherence of two EEG signals

gilmar wrote: > > gilmar wrote: > > > > I have read that the FFT applied to the cross-correlation of two > signals > > > (A and B) is equivalent to the cross-spectrum. I've also read that > the > > > cross-spectrum is calculated from the equation: > > > (FFT(A).*conj(FFT(B)))/...

Re: upsampling an impulseresponse

Jerry Avins wrote: > Helium wrote: > > > I have an impulseresponse at 44100Hz and I don't have a chance to get > > it at any other rate. But in my program I need it at any rate. What > > would you recommend for upsampling to an arbitrary rate (e.g. 48000, > > 88200, 96000, ... all com...

Re: two signals (Stretch and offset)

I knew about the cross correlation, but i thought it could only give an x-shift. I understood it as, for every x-shift, find the correlation. How would i extract the scale parameter from correlation. Let A and B be signals of length n. Lets suppose we compute the cross-correlation of A and...

Re: signal similarity

"Elijah Bailey" wrote in message news:e008fef8.0404020301.1d16d08@posting.google.com... > What are some of the known similarity measures between signals? > Can someone point me to code/papers to do this? > > My signals are discrete defined on [x_i = 1..n]. Cross correlation is the...

Re: How to phase align two waveforms?

Hi Brian! Calculate the cross correlation function and find the maximum closest to zero. This is the time shift betweeen your signals. Best regards, Andre Brian wrote: > I am recording electric guitar with several microphones. I want to ensure > that each mic's audio is phase ali...

shift the 2D cross correlation result

Hi, Could anybody tell me how to shift the 2D cross correlation result in matlab. For example, in 1D cross correlation, the result of cross correlation will be twice of the maximum signal length minus 1, which then the first half of the graph will be padded to zero. The result will spread from ri...

Re: Newbie: System Performance

If I correlate - PI/200.0*cos(2*PI/80) with itself over one period, I get a peak value of - 0.009869604 If I correlate it with my signal after demodulation I get a peak of - 0.009924131 Based on this, how can I express the accuracy of my demodulated signal when D = PI/200? Thei...

Re: Correlation of 2 Sequences using FFT (W/W.O FFTW)

ramojparuchuri@gmail.com (Ramoj Paruchuri) wrote in message news: ... > > Sounds reasonable. You need to ensure that the frequency sampling is > > equal for the two spectra. > > Frequency sampling? or is it time sampling? -- I thought if one can > ensure that time sampling is equa...

Re: Sampling frequency requirements

"Allan Wilson" wrote in message news: ... > Hi, > > I've got a sampling frequency question. > > I have two signals, which only have frequency components up to about 100Hz, > from two sensors in a liquid stream. I need to get the phase (time) > difference between these two signals...

Re: Correlation using FFT

Hi Mark, Thank you for your reply. It is certainly more complicated then I thought it would be, but I will figure it out. Thanks also for the link to your document, I will read through it. As for the cross correlation function, I would be more then happy to provide the code for it when I have...

Fast cross correlation!

Hi! I would like to speed up a cross correlation application which looks like this: x has to be cross-correlated with "n" different length y's. I would like to precompute the FFT of the x before making the convolution with all the y's. Thats why I dont want to use the classic convolut...

Re: What is the intuitive thought behind the cross-correlation function?

Hello Kiki, To expand on what Stephan had stated, the cross correlation is taking advantage of the signal containing both positive and negative values. So for the case of proper alignment, the integrand is nonnegative, so the integration in effect adds up all of the positive numbers. But if th...

Re: Audio delay circuit

"Jerry Avins" wrote in message news:2u9p7nF27irohU1@uni-berlin.de... > George W wrote: > > > I have a need to measure the relative delay between two audio signals > > arriving at a receiver via different paths. The audio signals are standard > > 3 kHz audio bandwidths containing...

Generalized Cross Correlation

Thanks Jerry, I have Googled the subject :o). The technique is cited often for determining the location of an acoustic audio signal source based on TDOA. My application is similar except I'm determining the location of a radio transmitter using TDOA where the signal arrives at a receiver via ...

Re: xcorr in MATLAB

ricky2882 wrote: > Hi, > > I have a seemingly simple problem that i can't manage to solve. Been busy with the same thing for the last three days ... :-( ... > I did C = xcorr(A,B), and plotted C. Now I don't know what the > horizontal axis is, > and i get a weird triangular peak...

Re: Refresh - Method for cleaning noise from a measured sweep

Tim Wescott wrote: > Bob Cain wrote: > > > Got it! I took the Hilbert transform of my source sweep and > > multiplied the measurement by both the sweep and the transform, low > > pass filtered each of those results, multiplied the sweep and the > > transform by those filtered re...

Re: Cross correlation

> vakilp wrote: > > > > > Let me give you some code here: > > > > % Code is a circular array and hence we have the begin and end indecies. > > Each Data and Code are 15999 elements long. Each element of array holds > > two doubles. One is real and one is imaginary % > > > > %Cur...

Re: Sound Source Localization

"ETS" wrote in message news:10r1j965n5ruh3c@corp.supernews.com... > Plum wrote: > > Hi, I'm working on a semester project on sound source localization, > > where my aim is to determine the position of the source of a sound > > using two microphones and estimating the time delay of ...

Methods for digital signal comparison?

Hello wizards, Is there a "best" known way for comparing two finite-same-sized digital signals? I want a good way to measure the degree of similarity of the *shape* of the two signals. This is for comparing magnetic signatures of vehicles. Is the best way just to do a scaled cross correlati...

Methods for digital signal comparison?

Hello wizards, Is there a "best" known way for comparing two finite-same-sized digital signals? I want a good way to measure the degree of similarity of the *shape* of the two signals. This is for comparing magnetic signatures of vehicles. Is the best way just to do a scaled cross correlati...

Re: covariance question

Tom Derham wrote: > If a zero-mean Gaussian random noise signal is at the input to a matched > filter bank (so the input to each filter is identical), what is the nature > of the outputs of each filter in the bank? > Assuming the filters are linear then each output should also be Gaussi...

Re: trying to find 2D similarity patterns by xcorr2

Hi Lucy, If you want to measure similarity based on maximum correlation that's fine but if you wanted to take into account scaling and bias, I'd recommend you consider using correlation coefficients instead. In any case and concerning Matlab's xcorr. If you look at the function's help it...

Re: Filter-banks: efficient splitting?

"Mr Pook" wrote in message news:6b2f594e.0502081452.1c5440e@posting.google.com... > I'm trying to split an audio signal into various bands and perform > cross-correlation between bands over a stereo signal, so phase must be > linear. > > To make filterbank I just defined X equal-wid...

Re: Composer Software ( wav to midi )

Thanks folkes. > > How do you envisage people helping? Programming or musically? Good advice and references. Are there any conference papers on this kind of thing? I had a look on science direct and found nothing. > > exactly* n instruments playing simultaneously I'm not too pushed abou...

Re: Analysis of uneven sampled data, usage of correlation etc

Johan Myrberger wrote: > Let's say the data is sampled every week, but for some reason there's a 4 > month gap. In this case I interpolate the data for the missing period. You can't analyze data that isn't there. Instead of guessing the data, why not simply guess the result? The cross corre...

Re: A challenging DSP problem

Mark Borgerding wrote: > duvijan@gmail.com wrote: > > Hi all > > > > The problem is to detect repeating patterns of music in any > > (Movie/Album)Song. > > The duration of repeating pattern is dynamic is sometimes well over 2 > > seconds. > > Therefore for a 44.1khz song 16...

Cross-Correlation Function of Band-limited Noise

Hi I'm looking at an instrument used in radio astronomy and hoped that you guys might be able to clarify something for me... 1) What is the cross-correlation function of two sets independent sets of band-limited white noise? 2) Peyton & Peebles says that if the two sets of band-limited noi...

Cross Correlation and Noise Reduction in Mic Arrays

I'm looking at a problem involving an array of microphone elements. The array is closely spaced, clustered within less than half the wavelength of the highest frequency of interest. The operations used to create outputs from this array is differencing, time integration and then further...

cross correlation

Can anyone give me a pointer to tutorials on cross correlation and matched filters. I have a repeating pattern in a signal, represented by a, and the pattern that I would like to identify is represented by b, I use xcorr(a,b) in matlab but the result appears nothing like expected. "a" is 20...

Regarding the crossed correlation of two binary matrices

I am a cs student who's doing a project in satellite image field. My project is: Input: satellite images from MSG European satellite. Those are colored images which come along with text files that physically represent every pixel in the image (i mean that every pixel has a record in the text ...

Re: I need 2D cross correlation code

projector wrote: > Hello all, > > for the last month i was searching for 2D cross correlation code in C/C++ > with no success. > I also tried many times to use the 'mcc' function in matlab & convert the > normxcorr2.m into C/C++ but it's issuing so many problems I'll spare you > with...