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76 lines
1.4 KiB
C++
76 lines
1.4 KiB
C++
/*
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dsp/util.h
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Copyright 2002-4 Tim Goetze <tim@quitte.de>
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http://quitte.de/dsp/
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Common math utility functions.
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*/
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/*
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA or point your web browser to http://www.gnu.org.
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*/
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#ifndef _DSP_UTIL_H_
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#define _DSP_UTIL_H_
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namespace DSP {
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inline int next_power_of_2 (int n)
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{
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assert (n <= 0x40000000);
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int m = 1;
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while (m < n)
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m <<= 1;
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return m;
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}
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inline bool
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isprime (int v)
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{
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if (v <= 3)
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return true;
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if (!(v & 1))
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return false;
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for (int i = 3; i < (int) sqrt (v) + 1; i += 2)
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if ((v % i) == 0)
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return false;
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return true;
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}
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inline double
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db2lin (double db)
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{
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return pow (10., db * .05);
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}
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inline double
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lin2db (double lin)
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{
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return 20. * log10 (lin);
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}
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} /* namespace DSP */
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#endif /* _DSP_UTIL_H_ */
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