Marsyas
0.6.0-alpha
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00001 /* 00002 ** Copyright (C) 1998-2006 George Tzanetakis <gtzan@cs.uvic.ca> 00003 ** 00004 ** This program is free software; you can redistribute it and/or modify 00005 ** it under the terms of the GNU General Public License as published by 00006 ** the Free Software Foundation; either version 2 of the License, or 00007 ** (at your option) any later version. 00008 ** 00009 ** This program is distributed in the hope that it will be useful, 00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 ** GNU General Public License for more details. 00013 ** 00014 ** You should have received a copy of the GNU General Public License 00015 ** along with this program; if not, write to the Free Software 00016 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00017 */ 00018 00019 #ifndef MARSYAS_LIMITER_H 00020 #define MARSYAS_LIMITER_H 00021 00022 #include <marsyas/system/MarSystem.h> 00023 00024 namespace Marsyas 00025 { 00037 /* How to use the Limiter Marsystem 00038 00039 The system can be setup using the marsystem manager 00040 series->addMarSystem(mng.create("Limiter", "limiter")); 00041 00042 Options: Threshold can be set to any value between 0 and 1 00043 Limiter 0 <= thresh <= 1.0 00044 series->updctrl("Limiter/limiter/mrs_real/thresh", thresh); 00045 00046 Attack time can be calculated using the following formula: at = 1 - exp(-2.2*T/t_AT) 00047 where at = attack time, T = sampling period, t_AT = time parameter 0.00016 < t_AT < 2.6 sec 00048 series->updctrl("Limiter/limiter/mrs_real/at", t_AT); 00049 00050 Release time can be calculated similar to at time: rt = 1 - exp(-2.2*T/t_RT) 00051 where rt = rt time, T = sampling period, t_RT = time parameter 0.001 < t_RT < 5.0 msec 00052 series->updctrl("Limiter/limiter/mrs_real/rt", t_RT); 00053 00054 Slope factor: 0 < slope <= 1.0 00055 series->updctrl("NoiseGate/noisegate/mrs_real/rt", slope); 00056 */ 00057 00058 00059 class Limiter: public MarSystem 00060 { 00061 private: 00062 void addControls(); 00063 void myUpdate(MarControlPtr sender); 00064 00065 mrs_real xdprev_; 00066 realvec xd_; 00067 realvec gains_; 00068 mrs_real alpha_; 00069 00070 public: 00071 Limiter(std::string name); 00072 ~Limiter(); 00073 MarSystem* clone() const; 00074 00075 void myProcess(realvec& in, realvec& out); 00076 }; 00077 00078 }//namespace Marsyas 00079 00080 #endif