The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 1996
Filed:
Nov. 22, 1993
Applicant:
Inventors:
James E Van Hout, Auburn Hills, MI (US);
David J Madaj, Ann Arbor, MI (US);
Roland Holloman, Southfield, MI (US);
Philip A Kuyava, Troy, MI (US);
Assignee:
Chrysler Corporation, Highland Park, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381 58 ; 381 59 ;
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.