DCRemove.cpp

/*
VocoderSynth is a DSP plugin.

Copyright 2024 Tim Krause

This file is part of VocoderSynth

VocoderSynth is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.

VocoderSynth 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
General Public License for more details.

You should have received a copy of the GNU General Public License
along with VocoderSynth. If not, see
<https://www.gnu.org/licenses/>.

Contact: tim.krause@twkrause.ca

*/
#include "DCRemove.h"

#define ALPHA_DC 0.997

DCRemove::DCRemove(void)
{
    z1 = 0.0f;
}

float DCRemove::Evaluate(float x)
{
    float m = x + ALPHA_DC*z1;
    float r = m - z1;
    z1 = m;
    return r;
}