Increasing xcorr() resolution
4 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Hello,
Is there a wa y to increase the "resolution" of xcorr?
Something like zero padding for the fft()
Thanks,
Patrick
0 comentarios
Respuesta aceptada
Daniel Shub
el 28 de Abr. de 2011
Zero padding will increase the frequency resolution (i.e., reduce the spacing between frequency components), but does not affect the temporal resolution (the time between samples). The resample function increases the temporal resolution, but does not affect the frequency resolution.
a = [0, 0, 1, 0, 1, 0, 0];
b = [0, 0, 1, 1, 1, 0, 0];
upFactor = 10;
aUp = resample(a, upFactor, 1);
bUp = resample(b, upFactor, 1);
[r, lags] = xcorr(a, b, 'coeff');
[rUp, lagsUp] = xcorr(aUp, bUp, 'coeff');
lagsUp = lagsUp/upFactor;
plot(lags, r, 'b', lagsUp, rUp, 'r');
It you do not want a normalized cross-correlation, you will need to scale rUp.
0 comentarios
Más respuestas (0)
Ver también
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!