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Re: the autocorrelation function for measuring the F0
Title: Re: the autocorrelation function for measuring the
At 1:10 PM -0700 7/28/05, Stefan Crawcour wrote:
When calculating the F0 from the speech
sample, I automatically use the autocorrelation function. But, what
does the autocorrelation function really do? Is it a similar mechanism
as in the FFT (multiplying the speech sample with an appropiate
window, if I am not terribly mistaken) ?
It's not clear what you mean when you say you "use the
autocorrelation function." Speech does not, in general,
have an autocorrelation function, which is defined as a function of a
stationary random process, or of a finite signal (with bounded
energy); speech is neither. What you're probably doing is a
short-time autocorrelation, which is defined for signals of finite
duration, or for segments of signals made finite by windowing.
Here's some stuff google finds for
It is not unusual for the phrase "short-time" to be
omitted, thereby confusing the issue.
To answer "what does it really do?": it computes of the
ACF of the windowed signal, which might be what you were wanting to
verify. Or was it?