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. 18, 1986
Filed:
Mar. 14, 1983
Applicant:
Inventors:
Ioan R Allen, Tiburon, CA (US);
Craig C Todd, Muir Beach, CA (US);
Assignee:
Dolby Laboratories Licensing Corporation, San Francisco, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; H04R / ;
U.S. Cl.
CPC ...
369 86 ; 369 89 ;
Abstract
Discrete four-channel photographic (optical) motion picture sound-tracks are disclosed that are compatible with existing monophonic and stereo variable area (SVA) theatre projection equipment. Six track and four track embodiments are disclosed. In the four track embodiments 4-4-4 matrix encoding is employed in producing the sound-track. Apparatus for recording and reproducing the compatible four-channel sound-tracks are also disclosed.