Capsim Block Documentation
This star implements a simple LMS adaptive filter.
Port | Type | Name | |
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0 | float | x | |
1 | float | z |
Port | Type | Name | |
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0 | float | y |
Num | Description | Type | Name | Default Value | |
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0 | Filter order | int | N | 10 | |
1 | LMS gain constant | float | mu | 0.1 | |
2 | Flag: 0=estimate, 1=error | int | outputFlag | 0 |
Num | Type | Name | Initial Value | Description |
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0 | float* | x_P | ||
1 | float* | w_P |
int i; int j; float tmp1,tmp2; float dhat; float temp; float error; |
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/* * Allocate memory and return pointers for tapped delay line x_P and * array containing impulse response samples, h_P. * */ if( (x_P = (float*)calloc(N,sizeof(float))) == NULL || (w_P = (float*)calloc(N,sizeof(float))) == NULL ) { fprintf(stderr,"lms: can't allocate work space\n"); return(4); } /* * initialize the tapped delay line and weights to zero. * */ for (i=0; i |
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for(j = MIN_AVAIL(); j>0; j--) { /* * Shift input sample into tapped delay line */ IT_IN(0); tmp2=x(0); for(i=0; i |
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free(x_P); free(w_P); |
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/* Capsim (r) Text Mode Kernel (TMK) Star Library (Blocks) Copyright (C) 1989-2017 Silicon DSP Corporation This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA http://www.silicondsp.com Silicon DSP Corporation Las Vegas, Nevada */ |
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/* lms.s */ /*********************************************************************** lms() ************************************************************************ This star implements a simple LMS adaptive filter. Param: 1 - (int) N filter order. 2 - (float) LMS gain constant. 3- (int) Flag to output either estimate or error |
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