DMR Root Raised Filter

        // Filter details ..
	// filtertype	 =	 Raised Cosine
	// samplerate	 =	 48000
	// corner	 =	 2400
	// beta	 =	 0.7
	// impulselen	 =	 21
	// racos	 =	 sqrt
	// comp	 =	 no
	// bits	 =	
	// logmin	 =	
	private static final int NZEROS=20;
	private static final double GAIN=1.063197639e+01;
	private double xv[]=new double [NZEROS+1];
	private static final double XCOEFFS[]=
	  { -0.1142415065, -0.0652615756, +0.0266625160, +0.1613371679,
	    +0.3321186878, +0.5261565098, +0.7257137259, +0.9104055994,
	    +1.0600181526, +1.1574475610, +1.1912627108, +1.1574475610,
	    +1.0600181526, +0.9104055994, +0.7257137259, +0.5261565098,
	    +0.3321186878, +0.1613371679, +0.0266625160, -0.0652615756,
	    -0.1142415065,
	  };

    // A root raised pulse shaping filter
    public int rootRaisedFilter (int sample)	{
    	int i;
    	double sum=0.0;
    	double in=(double) sample;
    	for (i=0;i<NZEROS;i++)	{
    		xv[i]=xv[i+1];
    	}
    	xv[NZEROS]=in/GAIN;
    	for (i=0;i<=NZEROS;i++)	{
    		sum=sum+(XCOEFFS[i]*xv[i]);
    	}
    	return (int)sum;
    }