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# Questions tagged [autocorrelation]

Autocorrelation is the cross-correlation of a signal with itself.

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### Correlation meter

I have three questions regarding the correlation meters used in audio. How are they calculated? I have heard correlation is performed by convolving one signal with the time flipped version of a other,...
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### What is the best pitch (frequency detector) for a Voice Activity Detection Algorithim?

I am programming a Voice Activity Detection algorithm. After researching several methods, I implemented a simple method that determines whether or not the person is speaking based off the RMS of the ...
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### Autocorrelation - Stochastic vs deterministic processes

On one hand, there is the statistical definition: $R_x(\tau) = \frac{\operatorname{E}[(X_t - \mu)(X_{t+\tau} - \mu)]}{\sigma^2}$ and on the other hand, there is this other definition (e.g. see Dilip'...
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### Speech discrimination from animal sound

i am looking for discrimination of speech from animal sound if you take a 150ms frame of speech and bird as shown below, what feature can i extract from them so that i can effectively state the ...
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### AutoCorrelation using FFT of power spectrum

I have a chunk of data (samples) that need to do autocorrelation using FFT method. All data are real and lies between -1 and +1. What I have done follows: Zero pad the window with the length equals ...
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### Fourier transform of Autocorrelation function, what am I missing here? (Power spectrum)

Given this problem I know that the autcorrelation and power spectrum are fourier pairs, so when taking taking fourier transform of Rxx, one should end up with Sxx However, when I take the transform ...
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### What happens to signal, if we offset periodic auto-correlation?

suppose $x_n$ is an $N$-point sequence with periodic auto-correlation $$c_n=\sum_m x_m x_{(n+m) mod N}$$ How to find $N$-point sequence $y_n$ with periodic auto-correlation $d_n = c_n - A$, where \$...
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### Evaluating auto correlation strength (Gamma)

I'm working on Cognitive Radio in TV Band Spectrum. I need to sense the presence of signal in a particular spectrum. I have to sample the incoming signal (say 1000 samples) and I have to find the ...
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### What data should be collected to determine the autocorrelation sequence?

For a current project I need to implement an algorithm that needs the autocorrelation sequence of the channel, as part of a key step. We're measuring the frequency utilisation in our local area - ...
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### Measure of harmonicity in a time-series

I'm analyzing speech signal for identifying voiced and unvoiced regions. Voiced regions are supposed to have a "pitch", which can be estimated using auto-correlation function (ACF). Basically, one ...
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### Iterative Auto and Cross Correleation Estimates

I'm looking for literature or other information that covers iteratively estimating the auto- and cross-correlation vectors and the auto-correlation matrix. Initially, I can assume the signal is wide-...