Thread Subject: rootmusic in signal processing toolbox

hii
can anyone explain me the algorithm/mathematics deployed in calculating frequency and power content of a signal x in the function 'rootmusic' ??

On 22 Nov, 19:33, "ashutosh srivastava" <srivastava_ashu1...@in.com>
wrote:
> hii
> can anyone explain me the algorithm/mathematics  deployed in calculating frequency and power content of a signal x in the function   'rootmusic' ??

The frequency estimation is a common subspace decomposition
but reformulated as a polynomial rooting problem instead of
the usual search over the frequency manifold. You ought to
find descriptions in any textbook on DSP worth its price tag.

As always with MUSIC-type algorithms, you should be highly s
uspicious about any claims about power estimation. There is a
lot of myth and superstition around regarding what somebody
once upon a time termed the MUSIC pseudo spectrum. All too many
amateurs think that the pseudo spectrum has to do with the
signal's power density spectrum. Which, of course it has not.

Nevertheless, all too many MUSIC implementations have been
made by amateurs, so you have no choise but to look up the
source code of the function and see for yourself if the
power estimates have anything whatsoever to do with reality.

Rune