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 - 2007 Christian Schoenebeck * |
* Copyright (C) 2005 - 2016 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 * |
95 |
return log(FreqRatio) / log(TWELVEHUNDREDTH_ROOT_OF_TWO); |
return log(FreqRatio) / log(TWELVEHUNDREDTH_ROOT_OF_TWO); |
96 |
} |
} |
97 |
|
|
98 |
|
/** |
99 |
|
* Calculates the line ratio value representation (linear scale) |
100 |
|
* of the @a decibel value provided (exponential scale). |
101 |
|
* |
102 |
|
* The context of audio acoustic sound pressure levels is assumed, and |
103 |
|
* hence the field version of the dB unit is used here (which uses a |
104 |
|
* linear factor of 20). This function is a bit slow, so it should |
105 |
|
* not be called too frequently. |
106 |
|
* |
107 |
|
* @param decibel - sound pressure level in dB |
108 |
|
* @returns linear ratio of the supplied dB value |
109 |
|
*/ |
110 |
|
static float DecibelToLinRatio(float decibel) { |
111 |
|
return powf(10.f, decibel / 20.f); |
112 |
|
} |
113 |
|
|
114 |
|
/** |
115 |
|
* Calculates the relatively summed average of a set of values. |
116 |
|
* |
117 |
|
* @param current - the current avaerage value of all previously summed values |
118 |
|
* @param sample - new value to be applied as summed average to the existing values |
119 |
|
* @param n - amount of sample values applied so far |
120 |
|
* @returns new average value of all summed values (including the new @a sample) |
121 |
|
*/ |
122 |
|
inline static float RelativeSummedAvg(float current, float sample, int n) { |
123 |
|
return current + (sample - current) / float(n); |
124 |
|
} |
125 |
|
|
126 |
private: |
private: |
127 |
static float* pCentsToFreqTable; |
static float* pCentsToFreqTable; |
128 |
|
|