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java - Advice on autocorrelation via FFT - Signal ...
https://dsp.stackexchange.com/questions/24927/advice-on-autocorrelation-via-fft
The units of the autocorrelation are time and not frequency, and it is centred around τ = 0. That means that in your − 1024 ≤ τ < 1023. So you are looking at the wrong peaks. Now as you can see the autocorrelation doesn't produce a sharp peak which means that it is not a good measure for your case.
java - Optimizing AutoCorrelation for pitch detection ...
https://stackoverflow.com/questions/48118788/optimizing-autocorrelation-for-pitch-detection
I'm in process of writing a java program that will read in audio from a guitar in 1024 sample chunks, and apply auto-correlation to find pitch. I have code implemented for auto-correlation and it works fine, but for a 1024 sample input it takes 524800 iterations!
autocorrelation - Correlation Using FFT / IFFT ...
https://dsp.stackexchange.com/questions/16222/correlation-using-fft-ifft-convolution-in-frequency-domain-in-java
I try to find about the delay between two audio files using Cross Correlation in Java. I've already done this algorithm so far that i get a idea about how many samples is the delay. FFT x1 -> Zero Padding to length: x1.length() + x2.length() FFT x2 -> Zero Padding to length: x1.length() + x2.length() X3 = FFT{x1} multiply FFT{2}* x3 = IFFT{X3}
java - Method for Calculating Autocorrelation Function of ...
https://stackoverflow.com/questions/10148931/method-for-calculating-autocorrelation-function-of-an-array
I'm in need of a real fast autocorrelation algorithm. best would be in java. Have used the Apache Commons PearsonsCorrelation class so far, but it's much too slow. Have also heard of the Wiener Chintschin Theorem trieng this out atm. Im quite interested in the YIN Autocorrelation Algorithm. But haven't found any source implementation yet.
How to do autocorrelation with audio signal and parameters
https://www.mathworks.com/matlabcentral/answers/480515-how-to-do-autocorrelation-with-audio-signal-and-parameters
To perform correlation between two signals, you can use ‘xcorr’ function. In ‘xcorr’, if you provide only one input, output will be the autocorrelation of the signal for different lags. [c,lags] = xcorr (x);
Autocorrelation (for sound signals)
https://pages.mtu.edu/~suits/autocorrelation.html
Autocorrelation (for sound signals) "Autocorrelation" is used to compare a signal with a time-delayed version of itself. If a signal is periodic, then the signal will be perfectly correlated with a version of itself if the time-delay is an integer number of periods.
Example: Calculate the autocorrelation function of time ...
https://www.philippe-fournier-viger.com/spmf/TimeSeriesAutocorellation.php
Autocorrelation is defined based on the concept of lag. To generate the correlation function of a time series, we will set a parameter called max_lag, and calculate all values of the autocorrelation function with a lag from 1 to max_lag. The autocorrelation function can be viewed as a time series with values in the [-1,1] interval.
comp.dsp | Autocorrelation function, Java or C code
https://www.dsprelated.com/showthread/comp.dsp/59527-1.php
Does anyone have any optimized Java or C code for an autocorrelation function. It is my first time needing to do autocorrelation and it seems straight forward enough to be able to write the code myself, but due to the amount of iterations it would be wise to ask for code that already has it's fat trimmed.
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