MicroMDAEPiano/OnePoleLP.h

/*
    ==============================================================================
    This file is part of Tal-NoiseMaker by Patrick Kunz.

    Copyright(c) 2005-2010 Patrick Kunz, TAL
    Togu Audio Line, Inc.
    http://kunz.corrupt.ch

    This file may be licensed under the terms of of the
    GNU General Public License Version 2 (the ``GPL'').

    Software distributed under the License is distributed
    on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
    express or implied. See the GPL for the specific language
    governing rights and limitations.

    You should have received a copy of the GPL along with this
    program. If not, go to http://www.gnu.org/licenses/gpl.html
    or write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
    ==============================================================================
 */

#if !defined(__OnePoleLP_h)
#define __OnePoleLP_h

class OnePoleLP {
public:
    float inputs, outputs, lastOutput;

    OnePoleLP() {
        lastOutput = inputs = outputs = 0.0f;
    }

    ~OnePoleLP() {}

    void tick(float *sample, float cutoff) {
        float p = (cutoff * 0.98f) * (cutoff * 0.98f) * (cutoff * 0.98f) * (cutoff * 0.98f);
        outputs = (1.0f - p) * (*sample) + p * outputs;
        *sample = outputs;
    }
};

#endif