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comparison m-toolbox/classes/@specwin/kaiser_flatness.m @ 0:f0afece42f48

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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1 function flatness = kaiser_flatness(alpha)
2
3 % KAISER_FLATNESS returns the flatness in dB of the central bin of a kaiser
4 % window with parameter alpha.
5 %
6 % Taken from C code of Gerhard Heinzel:
7 %
8 % Compute the flatness in the central bin [dB]
9 % of Kaiser windows from the parameter alpha.
10 % Best-fit polynomial was obtained from 180 data
11 % points between alpha=1 and alpha=9.95.
12 % Maximum error is 0.013 dB.
13 %
14 % M Hewitson 19-05-07
15 %
16 % $Id: kaiser_flatness.m,v 1.2 2011/04/08 08:56:36 hewitson Exp $
17 %
18
19 a0 = 0.141273;
20 a1 = 0.262425;
21 a2 = 0.00642551;
22 a3 = -0.000405621;
23 x = alpha;
24 flatness = -1. / (((((a3 * x) + a2) * x) + a1) * x + a0);
25
26 % END