/**
 * This interface provides a means by which the UltrasoundListener class
 * can notify external applications of ultrasound detections.  Any
 * external class that uses the UltrasoundListener class must supply it
 * with a reference to an object that implements this
 * UltrasoundUpdateListener interface.  Whenever the UltrasoundListener
 * class detects ultrasound, it notifies the class that implements this
 * interface.
 *
 * @author Tony Offer
 * @author Chris Palistrant
 * @version 1.0
 */
public interface UltrasoundUpdateListener {

    /**
     * This method is called by the UltrasoundListener class when
     * ultrasound is detected.  A timestamp describing the time at which
     * the ultrasound was detected is passed into this method.
     *
     * @param timeDetected    The time (in milliseconds since January 1,
     *                        1970) at which ultrasound was detected.
     */
    void ultrasoundDetected(long timeDetected);
}