JFK EXHIBIT F-367
													
																
		Dr. BARGER. Very well. There are 15 descriptors here. Each one 
	describes a case where an acoustical test pattern matched better than the 	threshold value of 0.6 with a segment of the Dallas tape.
		
		
	


	
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	    The first situation where this occurred I will label with blue. There were four test patterns that corresponded with the segment of the tape that began at 137.7 seconds after the stuck button, with coefficient, correlation coefficient, larger than 0.6, and these are the four. I will note with a 1 that that is the first time in the tape that any of the test patterns correlated with any of the impulse patterns in the police tape with a score better than 0.6, and it occurred four times.
	    Mr. CORNWELL. So at that point you are telling us that there is a segment of the Dallas police tape which very closely approximates or at least has a correlation coefficient of over 0.6 with respect to the various test shots?
	    Dr. BARGER. Yes. This section may contain the sound of gunfire. Then going on down in the list, we have what I will label the second time, the second place on the Dallas tape where correlations or matches were achieved that were good enough to exceed the threshold value, and I will label that with red brackets to highlight it, and there were five of them.
	    Then in the same way at a later time, around 145.15 seconds, in green, I will label and highlight the three test shot patterns that correlated with that part of the tape better than 0.6, and, finally, at 145 seconds--yellow is not the best, is it--well, the fourth part of the tape at 145.61 seconds had three different test patterns that achieved the correlation score greater than 0.6.
	    Let me rummage through my briefcase and see if I can find another color. Black is the obvious choice.
		Now, a feature of a detection by a reciever that was designed to 	detect the possibility of otherwise subaudible events by using the 
	threshold correlation procedure is that it can give threshold exceedences, the threshold having been 0.6, under two circumstances. One, it exceeds the threshold when it has correctly detected the event and the other is, it exceeds the threshold when it has incorrectly detected the event. The latter circumstance is called a false alarm.[Laughter.]
	    It is the purpose of the rest of my testimony now to examine the question: Which, if any, are false alarms?