Hi,
Maybe this can be of help.
http://www.musicdsp.org/archive.php?classid=3#65
All the best
Massimiliano
Il 19/01/2011 15.56, Uli Brueggemann ha scritto:
Hi,
thanks for the answer so far.
A polyphase filter is a nice idea but it does not answer the problem.
The signal has to be

I'm trying to understand autocorrelation as related to some pitch detection
algorithms I've been looking at.
In example code for the autocorrelation, it is the summation of a sample at
indexes multiplied by a sample at indexes plus an offset.
eg
for (i=0;isize;i++)
{
sum=0;
for

that's perfectly right.
When the two signal portions are alike, they are strongly correlated -
so you get a maximum value for the correlation.
If they have nothing in common you get a correlation value near zero.
For pitch detection you look for maxima in the auto-correlation.
There's also

On Jan 25, 2011, at 7:34 PM, Jan Baumgart wrote:
When the two signal portions are alike, they are strongly correlated
- so you get a maximum value for the correlation.
If they have nothing in common you get a correlation value near
zero.\
he said he was using periodic function generation.