Programmer Guide/Command Reference/EVAL/asp2osp: Difference between revisions
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Convert an amplitude spectrum to an order spectrum. | Convert an amplitude spectrum to an order spectrum. | ||
;Usage: | ;Usage: | ||
:<code>asp2osp(<var>a</var>, <var>df</var>, <var>f1</var>, <var>do</var>, <var>no</var>, <var>amin</var>)</code> | :<code>asp2osp(<var>a</var>, <var>df</var>, <var>f1</var>, <var>do</var>, :<code>asp2osp(<var>a</var>, <var>f</var>, <var>f1</var>, <var>do</var>, <var>no</var>, <var>amin</var>)</code> | ||
:;<var>a</var>:amplitude or power spectrum (vector) | :;<var>a</var>:amplitude or power spectrum (vector) | ||
:;<var>df</var>:frequency resolution of the spectrum in Hz (scalar); 0 < ''df'', ''f''[i]=i*df) | :;<var>df</var>:frequency resolution of the spectrum in Hz (scalar); 0 < ''df'', ''f''[i]=i*df) | ||
Revision as of 14:25, 13 April 2011
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).
