Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/filter_tools.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
|---|---|
| date | Fri, 25 Jun 2010 15:50:58 +0200 |
| parents | |
| children |
comparison
equal
deleted
inserted
replaced
| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
|---|---|
| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * filter_tools.h - A collection of routines used for filter design. | |
| 5 * | |
| 6 * Written by Steve Underwood <steveu@coppice.org> | |
| 7 * | |
| 8 * Copyright (C) 2008 Steve Underwood | |
| 9 * | |
| 10 * Based on: | |
| 11 * mkshape -- design raised cosine FIR filter | |
| 12 * A.J. Fisher, University of York <fisher@minster.york.ac.uk>, November 1996 | |
| 13 * | |
| 14 * All rights reserved. | |
| 15 * | |
| 16 * This program is free software; you can redistribute it and/or modify | |
| 17 * it under the terms of the GNU Lesser General Public License version 2.1, | |
| 18 * as published by the Free Software Foundation. | |
| 19 * | |
| 20 * This program is distributed in the hope that it will be useful, | |
| 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 23 * GNU Lesser General Public License for more details. | |
| 24 * | |
| 25 * You should have received a copy of the GNU Lesser General Public | |
| 26 * License along with this program; if not, write to the Free Software | |
| 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 28 * | |
| 29 * $Id: filter_tools.h,v 1.3 2008/04/17 14:26:56 steveu Exp $ | |
| 30 */ | |
| 31 | |
| 32 #if !defined(_FILTER_TOOLS_H_) | |
| 33 #define _FILTER_TOOLS_H_ | |
| 34 | |
| 35 #if defined(__cplusplus) | |
| 36 extern "C" | |
| 37 { | |
| 38 #endif | |
| 39 | |
| 40 void ifft(complex_t data[], int len); | |
| 41 void apply_hamming_window(double coeffs[], int len); | |
| 42 void truncate_coeffs(double coeffs[], int len, int bits, int hilbert); | |
| 43 | |
| 44 void compute_raised_cosine_filter(double coeffs[], | |
| 45 int len, | |
| 46 int root, | |
| 47 int sinc_compensate, | |
| 48 double alpha, | |
| 49 double beta); | |
| 50 | |
| 51 void compute_hilbert_transform(double coeffs[], int len); | |
| 52 | |
| 53 | |
| 54 #if defined(__cplusplus) | |
| 55 } | |
| 56 #endif | |
| 57 | |
| 58 #endif | |
| 59 /*- End of file ------------------------------------------------------------*/ |