speach singnal processing

http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-003-signals-and-systems-spring-2010/lecture-notes/MIT6_003S10_lec15.pdf

how to find difference between two dates in java

public String getTimeDiff(Date dateOne, Date dateTwo) {

String diff = "";

long timeDiff = Math.abs(dateOne.getTime() - dateTwo.getTime());

diff = String.format("%d hour(s) %d min(s)", TimeUnit.MILLISECONDS.toHours(timeDiff),

TimeUnit.MILLISECONDS.toMinutes(timeDiff) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(timeDiff)));

return diff;

}