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. 16, 1999
Filed:
May. 19, 1997
Michael L Petroff, West Hills, CA (US);
Harman Motive Incorporated, Martinsville, IN (US);
Abstract
A stereophonic signal processing system for enhancing the perception of sonic dimension and imaging in a sound reproduction system having at least two stereo speakers. The system provides a detector for detecting the continually changing value of amplitude ratio of a derived stereo difference signal relative to a derived stereo sum signal and dynamically expands, in real-time, changes in such ratio-value in the left-front and right-front output signals; an element for utilizing the ratio-value to control a decrease in the amplitudes of the front-left and front-right output signals; an element for utilizing the ratio-value to control a boost in the relative amplitude of bass frequencies in the left-front and right-front output signals and a boost in the amplitude of a subwoofer output signal; an element for utilizing the ratio-value to control a boost in amplitude of derived stereo difference signals that provide left-rear and right-rear output signals; and an element for utilizing the derived stereo sum signal to provide a center-front output signal.