level above threshold
level above threshold[′lev·əl ə‚bəv ′thresh‚hōld]
Also known as sensation level.
The pressure level of a sound in decibels above its threshold of audibility for the individual observer.
In general, the level of any psychophysical stimulus, such as light, above its threshold of perception.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.