id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ap-348	Kreidl, M.; Houfek, P.	Using the Correlation Function in Ultrasonic Non-destructive Testing	2002	4	.pdf	application/pdf	2377	120	65	� � � � � ��R rT N x � ��SN dBef2 ef2 ef1 ef1 � � � � � �20 log U N U N , (5) where Nef1 RMS value of the additive noise in the signal, Nef2 RMS value of noise included in the signal after application in a given algorithm, Uef1 RMS value of the ultrasonic signal, e.g., cor- responding to the flaw echo in the measured signal, Uef2 RMS value of the ultrasonic signal, when applying the tested algorithm.	cache/ap-348.pdf	txt/ap-348.txt