asp2osp
From STX Wiki
< Programmer Guide | Command Reference | EVAL
Jump to navigationJump to search
Convert an amplitude spectrum to an order spectrum.
- Usage
asp2osp(a, df, f1 {, do, no, oini})- a
- amplitude or power spectrum (vector)
- df
- frequency resolution of the spectrum in Hz; 0 < df
- f1
- frequency of the 1st order in Hz; 0 < f1
- do
- resolution of the order spectrum; 0 < do (default=0.1)
- no
- length of the order spectrum; 2 < no (default=500)
- oini
- amplitude value for order spectrum initialization (default=0)
- Description
- The function implements a fast algorithm to convert a frequency spectrum a=f(f) into an order spectrum ao=f(f1,do). The algorithm uses interpolation (if a must be expanded) or maximum detection (if a must be compressed) to approximate the values of the order spectrum. The frequency range of the order spectrum is limited to 0 to
f1*do*(no-1). All bins of o outside the frequency range of a (0..df*(nrow(a)-1)) are set the value oini. - Result
- The order spectrum o (vector with no elements).
