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44 lines
1.8 KiB
C++
44 lines
1.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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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 V3 for more details. //
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// //
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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, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include "util/db.h"
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#include <cmath>
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double CalcDb::dbPower(double magsq, double floor)
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{
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if (floor <= 0.0) {
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return -100.0;
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}
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if (magsq > floor) {
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return 10.0 * log10(magsq);
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} else {
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return 10.0 * log10(floor);
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}
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}
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double CalcDb::powerFromdB(double powerdB)
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{
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return pow(10.0, powerdB / 10.0);
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}
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double CalcDb::frexp10(double arg, int *exp)
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{
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*exp = (arg == 0) ? 0 : 1 + (int)std::floor(std::log10(std::fabs(arg) ) );
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return arg * std::pow(10 , -(*exp));
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}
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