nfmdemod.cpp File Reference

#include <stdio.h>
#include <complex.h>
#include <QTime>
#include <QDebug>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QBuffer>
#include "SWGChannelSettings.h"
#include "SWGNFMDemodSettings.h"
#include "SWGChannelReport.h"
#include "SWGNFMDemodReport.h"
#include "dsp/downchannelizer.h"
#include "util/stepfunctions.h"
#include "util/db.h"
#include "audio/audiooutput.h"
#include "dsp/dspengine.h"
#include "dsp/threadedbasebandsamplesink.h"
#include "dsp/dspcommands.h"
#include "device/deviceapi.h"
#include "nfmdemod.h"

Include dependency graph for nfmdemod.cpp:

Go to the source code of this file.

Functions
float	arctan2 (Real y, Real x)
Real	angleDist (Real a, Real b)

Function Documentation

angleDist()

Real angleDist	(	Real	a,
		Real	b
	)

Definition at line 138 of file nfmdemod.cpp.

References M_PI.

{
    Real dist = b - a;

    while(dist <= M_PI)
        dist += 2 * M_PI;
    while(dist >= M_PI)
        dist -= 2 * M_PI;

    return dist;
}

arctan2()

float arctan2	(	Real	y,
		Real	x
	)

Definition at line 118 of file nfmdemod.cpp.

References M_PI.

{
    Real coeff_1 = M_PI / 4;
    Real coeff_2 = 3 * coeff_1;
    Real abs_y = fabs(y) + 1e-10;      // kludge to prevent 0/0 condition
    Real angle;
    if( x>= 0) {
        Real r = (x - abs_y) / (x + abs_y);
        angle = coeff_1 - coeff_1 * r;
    } else {
        Real r = (x + abs_y) / (abs_y - x);
        angle = coeff_2 - coeff_1 * r;
    }
    if(y < 0) {
        return(-angle);
    } else {
        return(angle);
    }
}