/**           Test program for Fourier transform of sine
 *            functions.
 */
import uk.ac.ed.ph.signal.*;                      // Signal classes

public class SineSignal {
    public static void main(String args[]) {

	//        Make a RealSignal of 2048
	RealSignal s = new RealSignal(2048);
	s.setSampleInterval(0.1);             // Set sample interval
	
	//        Make second RealSignal with same interval

	RealSignal t = s.clone();

	//        Fill s with sine wave of amp 10 and 0.5 Hz and 
	//        DC offset of 12
	//        t with sine wave of amp 2 and 0.8 Hz
	s.fillSine(10.0, 0.5, 0.0, 12.0);
        t.fillSine( 2.0, 0.8, 0.0,  0.0);

	s.add(t);              // Add t to s
	
	s.toTextFile("s.data");         // Output s to text file


	//       Make ComplexSignal with s as the real part
	ComplexSignal z = new ComplexSignal(s);
	z.weight(new Hanning());        // Apply Hanning window to stop 
	                                // Ailiasing

	z.centreFourier();              // Take centred FFT

	//       Get the modulus as a RealSignal

	RealSignal m = z.getRealSignal();

	m.toTextFile("m.data");         // Output m to file
    }
}