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/*
* Copyright 2009,2010,2011,2012 Reality Jockey, Ltd.
* info@rjdj.me
* http://rjdj.me/
*
* This file is part of ZenGarden.
*
* ZenGarden is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ZenGarden is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with ZenGarden. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef _DSP_HIGH_PASS_FILTER_H_
#define _DSP_HIGH_PASS_FILTER_H_
#include "DspFilter.h"
/**
* [hip~], [hip~ float]
* A one-tap IIR filter: y[i] = a * (y[i-1] + x[i] - x[i-1])
*/
class DspHighpassFilter : public DspFilter {
public:
static MessageObject *newObject(PdMessage *initMessage, PdGraph *graph);
DspHighpassFilter(PdMessage *initMessage, PdGraph *graph);
~DspHighpassFilter();
static const char *getObjectLabel();
std::string toString();
private:
void processMessage(int inletIndex, PdMessage *message);
void calcFiltCoeff(float cutoffFrequency);
};
inline std::string DspHighpassFilter::toString() {
return DspHighpassFilter::getObjectLabel();
}
inline const char *DspHighpassFilter::getObjectLabel() {
return "hip~";
}
#endif // _DSP_HIGH_PASS_FILTER_H_