cxphase

 

	int i,no_samples;
	float re,im,rad,deg;
	float re_mag, im_mag;

 

	/* k is conversion factor from radians to degrees	*/
	k = 360.0/(2.0*3.1415927); 
	SET_CELL_SIZE_IN(0,sizeof(complex));
	SET_CELL_SIZE_OUT(0,sizeof(float));

 


	/* note the minimum number of samples on the 	*/
	/* input buffers and iterate that many times 	*/
	
	{
	for(no_samples=(MIN_AVAIL() ); no_samples >0; --no_samples) 

		{
		/* first get real sample	*/
		IT_IN(0);	
		re = x(0).re;

		/* now get imaginary sample	*/
		im = x(0).re;

		/* find magnitudes		*/
		re_mag = fabs(re);
		im_mag = fabs(im);

		/* find phase from arctangent	*/
		if ((re_mag < 1e-8) && (im_mag < 1e-8))
			rad = 0.78539382;	/* pi/4	*/
		else if (re_mag < 1e-8)
			rad = 0.0;
		else
			rad = (float)atan2((double)im,(double)re);

		/* convert to degrees		*/
		deg = k*rad;

		/* output value 		*/
		if(IT_OUT(0)) {
			KrnOverflow("cxphase",0);
			return(99);
		}
		y(0) = deg;
		}
	return(0);
	}

/*  Capsim (r) Text Mode Kernel (TMK) Star Library (Blocks)
    Copyright (C) 1989-2002  XCAD Corporation 

    This library 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 2.1 of the License, or (at your option) any later version.

    This library 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 this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    http://capsimtmk.sourceforge.net
    XCAD Corporation
    Raleigh, North Carolina */

 

/* cxphase.s */
/***************************************************************
			cxphase() 
****************************************************************
	Inputs:		x, the complex signal
	Outputs:	y, the phase 
	Parameters:	none
****************************************************************
This star finds the phase of a complex data stream.  Each complex 
sample is assumed to be composed of a real sample followed by 
an imaginary sample.

cxphase


This star finds the phase of a complex data stream.  Each complex 
sample is assumed to be composed of a real sample followed by 
an imaginary sample.


Programmer: 	Prayson W. Pate
Date:		April 18, 1988
Modified:	April, 1988

*/