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annotate m-toolbox/classes/@specwin/kaiser_w3db.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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f0afece42f48 Import.
Daniele Nicolodi <nicolodi@science.unitn.it>
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1 function w3db = kaiser_w3db(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_W3DB returns the 3dB bandwidth in bins of a kaiser window with
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % 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 3dB bandwidth (W3db) [bins]
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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 0.006 bins.
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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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Daniele Nicolodi <nicolodi@science.unitn.it>
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15 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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16 % $Id: kaiser_w3db.m,v 1.2 2011/04/08 08:56:35 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 = 0.757185;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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20 a1 = 0.377847;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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21 a2 = -0.0238342;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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22 a3 = 0.00086012;
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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 w3db = (((((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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Daniele Nicolodi <nicolodi@science.unitn.it>
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26 % END