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RMS.h

/*
      dsp/RMS.h
      
      Copyright 2004 Tim Goetze <tim@quitte.de>
      
      http://quitte.de/dsp/

      root-mean-square accumulator.

*/
/*
      This program 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 2
      of the License, or (at your option) any later version.

      This program 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 this program; if not, write to the Free Software
      Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
      02111-1307, USA or point your web browser to http://www.gnu.org.
*/

#ifndef _DSP_RMS_H_
#define _DSP_RMS_H_

namespace DSP {

class RMS
{
      public:
            d_sample buffer[64];
            int write;
            double sum;

            RMS()
                  {
                        write = 0;
                        reset();
                  }

            void reset()
                  {
                        sum = 0.;
                        memset (buffer, 0, sizeof (buffer));
                  }

            /* needs the squared sample value to be passed in */
            d_sample process (d_sample x)
                  {
                        sum -= buffer[write];
                        sum += x;
                        write = (write + 1) & 63;

                        return sqrt (sum / 64);
                  }
};

} /* namespace DSP */

#endif /* _DSP_RMS_H_ */

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