Programmer Guide/Command Reference/EVAL/sig2osp: Difference between revisions

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=====sig2osp=====
Compute the order spectrum of a signal.
;Usage:
:<code>sig2osp(<var>x</var>, <var>sr</var>, <var>f1</var> {, <var>do</var>, <var>no</var>, <var>oini</var>})</code>
:;<var>x</var>:signal vector
:;<var>sr</var>:signal sampling rate in Hz; 0 < ''sr''
:;<var>f1</var>:frequency of the 1st order in Hz; 0 < ''f1'' < ''sr''/4
:;<var>do</var>:resolution of the order spectrum; 0 < ''do'' (default=0.1)
:;<var>no</var>:length of the order spectrum; 2 < ''no'' (default=500)
:;<var>oini</var>:amplitude value for order spectrum initialization (default=0)
;Description 1: The function computes the amplitude spectrum of the signal ''x'' using a radix-2 fft. The signal is expanded with zeros to the next possible fft transformation length if necessary. The same resampling algorithm as used by the function [[../asp2osp|asp2osp]] is used to convert the frequency spectrum to an order spectrum.
;Result: The order spectrum ''o'' (vector with ''no'' elements).
;See also: [[../ticks2f1|ticks2f1]], [[../asp2osp|asp2osp]], [[../otrack1|otrack1]]


=====Usage:=====
[[../#Functions|<function list>]]
 
<code>sig2osp(<var>x</var>, <var>sr</var>, <var>f1</var>, <var>do</var>, <var>n</var>, <var>amin</var>)</code>
 
=====Function:=====
 
Computes an amplitude spectrum (fft) of the signal <var>x</var> and converts it to an order spectrum.
 
=====Parameters:=====
 
;<var>x</var>
 
:The signal.
 
;<var>sr</var>
 
:The sampling rate of <var>x</var>.
 
;<var>f1</var>
 
:The first order frequency.
 
;<var>do</var>
 
:The order resolution of the result (<code>frequency resolution =</code> <var>do</var><code>*</code><var>f1</var>).
 
;<var>n</var>
 
:The number of order lines.
 
;<var>amin</var>
 
:The default amplitude for unassigned order lines.
 
=====Result:=====
 
An order spectrum with <var>n</var> elements.

Latest revision as of 14:50, 13 April 2011

Compute the order spectrum of a signal.

Usage
sig2osp(x, sr, f1 {, do, no, oini})
x
signal vector
sr
signal sampling rate in Hz; 0 < sr
f1
frequency of the 1st order in Hz; 0 < f1 < sr/4
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 computes the amplitude spectrum of the signal x using a radix-2 fft. The signal is expanded with zeros to the next possible fft transformation length if necessary. The same resampling algorithm as used by the function asp2osp is used to convert the frequency spectrum to an order spectrum.
Result
The order spectrum o (vector with no elements).
See also
ticks2f1, asp2osp, otrack1

<function list>

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