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:
Nov. 12, 1996
Filed:
Jun. 15, 1994
Robert A Orban, Belmont, CA (US);
AKG Acoustics, Incorporated, San Leandro, CA (US);
Abstract
Two level detectors with logarithmic outputs receive an input audio signal. The first level detector receives the signal through a high-pass filter while the second level detector receives the signal through a band-pass filter contoured to simulate the equal-loudness curves of the human ear. The difference between the detectors' outputs (representing the log of the ratio of their respective input levels) is processed to provide quick broadband gain reduction whenever the ratio exceeds a preset threshold, providing de-essing. The difference is further smoothed and then applied to a voltage-controlled high-pass filter that provides high-frequency boost, the amount of which is controlled by the relative high frequency power contained within the input signal. This voltage-controlled high-pass filter applies automatic, program-adaptive equalization to the input signal.