Talkin: A robust algorithm for pitch tracking – autocorrelation equation

[Sarah B]

In the autocorrelation equation, why do we need to set j=m? It seems like overkill to me to introduce another variable – can you explain why we can’t just use m directly here?

Thanks

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[Simon King]

j and m are both indexing the samples in the entire waveform under analysis. Remember that we are doing short-term analysis which involved analysing short frames taken from that waveform

m is the first sample in the current analysis frame (the i’th frame)

j is counting through the samples in the current analysis frame

So j=m is the lower limit of the summation (the first sample in the current frame) but j then increments up to j=m+n-k-1 (the last sample in the current frame)

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