/[svn]/linuxsampler/trunk/src/common/RTMath.h
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revision 3192 by schoenebeck, Thu Dec 15 12:47:45 2016 UTC revision 3193 by schoenebeck, Sat May 20 12:28:57 2017 UTC
# Line 3  Line 3 
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
6   *   Copyright (C) 2005 - 2016 Christian Schoenebeck                       *   *   Copyright (C) 2005 - 2017 Christian Schoenebeck                       *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This program is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 100  class RTMathBase { Line 100  class RTMathBase {
100          }          }
101    
102          /**          /**
103           * Calculates the line ratio value representation (linear scale)           * Calculates the linear ratio value representation (linear scale)
104           * of the @a decibel value provided (exponential scale).           * of the @a decibel value provided (exponential scale).
105           *           *
106           * The context of audio acoustic sound pressure levels is assumed, and           * The context of audio acoustic sound pressure levels is assumed, and
# Line 110  class RTMathBase { Line 110  class RTMathBase {
110           *           *
111           * @param decibel - sound pressure level in dB           * @param decibel - sound pressure level in dB
112           * @returns linear ratio of the supplied dB value           * @returns linear ratio of the supplied dB value
113             * @see LinRatioToDecibel() as inverse function
114           */           */
115          static float DecibelToLinRatio(float decibel) {          static float DecibelToLinRatio(float decibel) {
116              return powf(10.f, decibel / 20.f);              return powf(10.f, decibel / 20.f);
117          }          }
118    
119          /**          /**
120             * Calculates the decibel value (exponential scale) of the @a linear
121             * ratio value representation (linear scale) provided.
122             *
123             * The context of audio acoustic sound pressure levels is assumed, and
124             * hence the field version of the dB unit is used here (which uses a
125             * linear factor of 20). This function is a bit slow, so it should
126             * not be called too frequently.
127             *
128             * @param linear - sound pressure level as linear ratio value (linear scale)
129             * @returns dB value representation
130             * @see DecibelToLinRatio() as inverse function
131             */
132            static float LinRatioToDecibel(float linear) {
133                return 20.f * log10f(linear);
134            }
135    
136            /**
137           * Calculates the relatively summed average of a set of values.           * Calculates the relatively summed average of a set of values.
138           *           *
139           * @param current - the current avaerage value of all previously summed values           * @param current - the current avaerage value of all previously summed values
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