Convert octave-reduced functions to narrowband.
g=octaven2nb(f)
g=octaven2nb(f,20)
g=octaven2nb(f,'silent')
OCTAVEN2NB takes a function F with octave-reduced "narrow band" PSD, Spectrum, Auto Spectrum, or FRF data, and expands it to narrow-band data. It determines the N-octave reduction by examining the OctaveFormat attribute. It will automatically determine whether the N-octave bands are ANSI or calculated from formulas by examining the abscissas.
NPTS is an optional input specifying the number of points to be used in the first N-octave band for the narrowband output. The default is 10. This value determines the frequency spacing for the output functions.
The optional input argument 'silent' suppresses any output.
The following formulas are used for the calculated N-octave bins:
center = 1000*2^(i/N)
where i = 0 for f0 = 1000 Hz
upper = center * 2^(1/2/N)
lower = center / 2^(1/2/N)
The ANSI/ISO standard frequencies used by OCTAVEN2NB are defined in ISO R 266 and ANSI S1.6-1984.