File: pitchconv.C

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// pitchconv.C

/******************************************************************************
 *
 *  MiXViews - an X window system based sound & data editor/processor
 *
 *  Copyright (c) 1993, 1994 Regents of the University of California
 *
 *  Author:     Douglas Scott
 *  Date:       December 13, 1994
 *
 *  Permission to use, copy and modify this software and its documentation
 *  for research and/or educational purposes and without fee is hereby granted,
 *  provided that the above copyright notice appear in all copies and that
 *  both that copyright notice and this permission notice appear in
 *  supporting documentation. The author reserves the right to distribute this
 *  software and its documentation.  The University of California and the author
 *  make no representations about the suitability of this software for any 
 *  purpose, and in no event shall University of California be liable for any
 *  damage, loss of data, or profits resulting from its use.
 *  It is provided "as is" without express or implied warranty.
 *
 ******************************************************************************/


#ifdef __GNUG__
#pragma implementation
#endif

#include "localdefs.h"
#include "pitchconv.h"

double Frequency::octaveFromPitch(double pch) {
	int oct = int(pch);
	return(oct + 8.333333 * (pch - oct));
}

double Frequency::pitchFromOctave(double oct) {
	double x;
	x = (int)oct;
	return(.12 * (oct - x) + x);
}

double Frequency::octaveFromCPS(double cps) {
	return(log(cps/1.021975)/.69314718);

	/* .69etc is log of 2., 1.02etc is offset for middle C */
}

double Frequency::cpsFromOctave(double oct) {
	return(pow(2.0,oct) * 1.021975);
}

double Frequency::cpsFromPitch(double pch) {
	int oct = int(pch);
	return((pow(2.0,oct+8.333333*(pch-oct))*1.021975));
}