asp2osp

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Convert an amplitude spectrum to an order spectrum.

Usage
asp2osp(a, df, f1, do, :asp2osp(a, f, f1, do, no, amin)
a
amplitude or power spectrum (vector)
df
frequency resolution of the spectrum in Hz (scalar); 0 < df, f[i]=i*df)
f
frequency scale of the spectrum in Hz (vector)
f1
frequency of the 1st order in Hz
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 1
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) and 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. All bins of o outside the frequency range of a (0..df*nrow(a)-1 or f[0]..f[nrow(a)-1] are set the value oini.
Result
The order spectrum o (vector with no elements).
See also
ticks2f1, sig2osp, otrack1

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