James E. Van Hout - Auburn Hills MI David J. Madaj - Ann Arbor MI Roland Holloman - Southfield MI Philip A. Kuyava - Troy MI
Assignee:
Chrysler Corporation - Highland Park MI
International Classification:
H04R 2900
US Classification:
381 58
Abstract:
A pre-recorded test tape or test disk which is used to isolate unwanted buzzes in an audio listening environment. The prerecording is a series of varying amplitude frequency sweeps. The frequency sweeps from the audible range of 20 Hz. to 400 Hz. , while the amplitude level is set at five different levels. The amplitude of the first sweep is set to the maximum output of the audio system which will give a clean 400 Hz. pre-recorded pallet tone. Each subsequent sweep is 6 dB down from the previous sweep.