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Ive recently been considering using Autocorrelation for Pitch Detection. However, I am finding it difficult on finding good sources of where to learn autocorrelation, by this I mean sources that make it easy to understand autocorrelation step-by-step. Im not that very good a programmer yet and also not really big on formulas so the sources that I find are really difficult to understand. Basically, what I know now is the concept of autocorrelation is like a compare-and-contrast method of a signal? But I would really appreciate it if I can have more understanding of the autocorrelation algorithm. Thank you very much! UPDATE: Here is a sample code I got from a site. Maybe you can use it as reference. Ive tested this code and it does return the correct pitch properly (albeit there are some incorrect ones here and there) maxOffset = sampleRate / minFreq; minOffset = sampleRate / maxFreq; for (int lag = maxOffset; lag >= minOffset; lag--) { float corr = 0; // this is calculated as the sum of squares for (int i = 0; i < framesize; i++) { int oldIndex = i - lag; float sample = ((oldIndex < 0) ? prevBuffer[frames + oldIndex] : buffer[oldIndex]); corr += (sample * buffer[i]); } if (corr > maxCorr) { maxCorr = corr; maxLag = lag; } } return sampleRate / maxLag;

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