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:
Mar. 15, 1994
Filed:
Dec. 01, 1992
James W Fosgate, Heber City, UT (US);
Other;
Abstract
A surround sound processor for presentation of a stereophonic source program on a multiple loudspeaker array surrounding the listening area, the processor comprising input signal conditioning and matrixing circuits, a control voltage generator responsive to the directional information contained in the stereophonic source signals, and a variable matrixing circuit for generating appropriate loudspeaker feed signals to create the illusion of the sound field spreading around the listening area, the control voltage generator having improvements in performance and reduced circuit complexity and cost. An inexpensive width-modulated pulse oscillator provides means for varying the time constants applied to directional information signals to produce control voltage signals for varying the matrixing coefficients. A new duration stretching circuit ensures tracking of the control voltages. The log-ratio detector circuits for producing the directional information signals achieve improved performance using less expensive parts.