Autocorrelation Function

Tags

speech-processing

Computes the correlation of a signal with itself (at a later or earlier point in time). Essentially a function that computes how similair a signal is at time \(i\) with that same signal at time \(i+n\) (for some number \(n\)).

Note: The only difference between this sum and the convolutional sum is that the signal in this case is reversed.

This [see page 16, function]:

• is often quite expensive to compute.
• is the basis for many spectrum analysis methods.
• Short-Term ACF (STACF) is the basis for many pitch detectors.
• STACF is often combined with ZCR to construct a voiced/unvoiced detector.