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annotate m-toolbox/classes/@specwin/kaiser_flatness.m @ 35:4be5f7a5316f database-connection-manager

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents f0afece42f48
children
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 function flatness = kaiser_flatness(alpha)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2
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Daniele Nicolodi <nicolodi@science.unitn.it>
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3 % KAISER_FLATNESS returns the flatness in dB of the central bin of a kaiser
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % window with parameter alpha.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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6 % Taken from C code of Gerhard Heinzel:
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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8 % Compute the flatness in the central bin [dB]
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Daniele Nicolodi <nicolodi@science.unitn.it>
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9 % of Kaiser windows from the parameter alpha.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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10 % Best-fit polynomial was obtained from 180 data
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Daniele Nicolodi <nicolodi@science.unitn.it>
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11 % points between alpha=1 and alpha=9.95.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12 % Maximum error is 0.013 dB.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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13 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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14 % M Hewitson 19-05-07
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15 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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16 % $Id: kaiser_flatness.m,v 1.2 2011/04/08 08:56:36 hewitson Exp $
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Daniele Nicolodi <nicolodi@science.unitn.it>
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17 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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18
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Daniele Nicolodi <nicolodi@science.unitn.it>
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19 a0 = 0.141273;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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20 a1 = 0.262425;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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21 a2 = 0.00642551;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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22 a3 = -0.000405621;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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23 x = alpha;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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24 flatness = -1. / (((((a3 * x) + a2) * x) + a1) * x + a0);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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25
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26 % END