CODEWITHSUNDEEP
audiosignal-processingconvolutioncross-correlation
user3489828
user3489828

Reputation:

Using cross-correlation to detect the beginning of a signal

I am using cross-correlation to find where an audio signal occurs within a recording. When doing this, the point of highest correlation is always found somewhere within the signal in the recording, but I'm looking for a way to find the point where that signal BEGINS in the recording. Does anybody know of a way to go about doing this, or if cross-correlation will even do the job? Thanks in advance.

Upvotes: 1

Views: 1261

Answers (1)

hotpaw2
hotpaw2

Reputation: 70703

If your signal is stationary, then instead of looking for a maxima using a single cross-correlation window, try looking for a maximum difference between 2 adjacent signal-sized cross correlation windows. If the prior window shows a very low correlation, and the current window shows a very high correlation, then the likelihood that you are right at a transition edge is good.

Upvotes: 2

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