view m-toolbox/classes/@specwin/kaiser_alpha.m @ 12:86aabb42dd84
database-connection-manager
Use utils.repository utilities
author
Daniele Nicolodi <nicolodi@science.unitn.it>
date
Mon, 05 Dec 2011 16:20:06 +0100 (2011-12-05)
parents
f0afece42f48
children
line source
+ − function alpha = kaiser_alpha(req_psll)
+ −
+ − % KAISER_ALPHA returns the alpha parameter that gives the required input
+ − % PSLL.
+ − %
+ − % Taken from C code of Gerhard Heinzel:
+ − %
+ − % Compute the parameter alpha of Kaiser windows
+ − % from the required PSLL [dB]. Best-fit polynomial
+ − % was obtained from 180 data points between alpha=1
+ − % and alpha=9.95. Maximum error is 0.05
+ − % Maximum error for PSLL > 30 dB is 0.02
+ − %
+ − % M Hewitson 19-05-07
+ − %
+ − % $Id: kaiser_alpha.m,v 1.2 2011/04/08 08:56:36 hewitson Exp $
+ − %
+ −
+ −
+ − a0 = -0.0821377;
+ − a1 = 4.71469;
+ − a2 = -0.493285;
+ − a3 = 0.0889732;
+ −
+ − x = req_psll / 100;
+ − alpha = (((((a3 * x) + a2) * x) + a1) * x + a0);
+ −
+ −
+ − % END