00001 #ifndef NOISEGENERATOR_H 00002 #define NOISEGENERATOR_H 00003 /* 00004 * This is the Loris C++ Class Library, implementing analysis, 00005 * manipulation, and synthesis of digitized sounds using the Reassigned 00006 * Bandwidth-Enhanced Additive Sound Model. 00007 * 00008 * Loris is Copyright (c) 1999-2009 by Kelly Fitz and Lippold Haken 00009 * 00010 * This program is free software; you can redistribute it and/or modify 00011 * it under the terms of the GNU General Public License as published by 00012 * the Free Software Foundation; either version 2 of the License, or 00013 * (at your option) any later version. 00014 * 00015 * This program is distributed in the hope that it will be useful, 00016 * but WITHOUT ANY WARRANTY, without even the implied warranty of 00017 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00018 * GNU General Public License for more details. 00019 * 00020 * You should have received a copy of the GNU General Public License 00021 * along with this program; if not, write to the Free Software 00022 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00023 * 00024 * 00025 * NoiseGenerator.h 00026 * 00027 * Definition of a class representing a filtered noise generator, used 00028 * as a modulator in bandwidth-enhanced synthesis. 00029 * 00030 * Kelly Fitz, 5 June 2003 00031 * loris@cerlsoundgroup.org 00032 * 00033 * http://www.cerlsoundgroup.org/Loris/ 00034 * 00035 */ 00036 00037 #include "Filter.h" 00038 00039 // begin namespace 00040 namespace Loris { 00041 00042 // --------------------------------------------------------------------------- 00043 // class NoiseGenerator 00044 // 00045 class NoiseGenerator 00046 { 00047 // --- interface --- 00048 public: 00049 // construction 00050 // copy and assign are free 00051 explicit NoiseGenerator( double initSeed = 1.0 ); 00052 NoiseGenerator( const Filter & f, double initSeed = 1.0 ); 00053 00054 // seed the random number generator and clear the filter's 00055 // delay line: 00056 void reset( double newSeed ); 00057 00058 // return the most-recently generated sample: 00059 double current( void ) const { return sample; } 00060 00061 // generate and return a new sample of 00062 // filtered noise: 00063 double next( void ); 00064 double operator() ( void ) { return next(); } 00065 00066 double next( double mean, double stddev = 1. ); 00067 double operator() ( double mean, double stddev = 1. ) { return next( mean, stddev ); } 00068 00069 00070 // --- implementation --- 00071 private: 00072 // random number 00073 inline double uniform( void ); 00074 inline double gaussian_normal( void ); 00075 00076 double sample; // the most recently-computed noise sample 00077 Filter filter; // filter applied to random number generator 00078 00079 // random number generator implementation: 00080 double u_seed; 00081 double gset; 00082 bool iset; 00083 00084 }; 00085 00086 00087 } // end of namespace Loris 00088 00089 #endif /* ndef NOISEGENERATOR_H */
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