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:
Jul. 20, 1976
Filed:
May. 16, 1975
Duane H Cooper, Champaign, IL (US);
Other;
Abstract
Multidirectional source signals which are encoded in two monaural and stereo-compatible transmission channels with predetermined amplitude and phase relations indicative of source directions and adapted to be decoded for formation of more than two loudspeaker presentation signals having source signals corresponding to every source direction appearing in a plurality of such presentation signals, but in differing relative amplitude, are decoded with at least one auxiliary channel. The auxiliary channels have the source signals encoded therein with amplitude and phase relations differently indicative of source directions, and the decode of the two mono and stereo compatible channels is combined with the decode of the auxiliary channels to produce presentation signals with sharpened directionality. Also disclosed are limited-frequency auxiliary channels.