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41 lines
2.5 KiB
C++
41 lines
2.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 F4EXB //
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// written by Edouard Griffiths //
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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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#ifndef SDRBASE_DSP_HBFILTERCHAINCONVERTER_H
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#define SDRBASE_DSP_HBFILTERCHAINCONVERTER_H
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#include <vector>
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#include "export.h"
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class QString;
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class SDRBASE_API HBFilterChainConverter
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{
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public:
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// Converts the chain hash as a base3 number each digit representing a filter stage from lower (LSD) to upper level (MSD)
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// The corresponding log2 of decimation or interpolation factor is also the number of filter stages
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// A vector of indexes as base3 digits is filled in (0: low band, 1: center band, : high band)
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// The shift factor of center frequency is returned. The actual shift is obtained by multiplying this factor by the sample rate.
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static double convertToIndexes(unsigned int log2, unsigned int chainHash, std::vector<unsigned int>& chainIndexes);
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// Same but used only for display giving a string representation of the filter chain
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static double convertToString(unsigned int log2, unsigned int chainHash, QString& chainString);
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// Just calculate the frequency shift factor relative to sample rate
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static double getShiftFactor(unsigned int log2, unsigned int chainHash);
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};
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#endif // SDRBASE_DSP_HBFILTERCHAINCONVERTER_H
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