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:
Jun. 30, 2015
Filed:
Oct. 17, 2013
Robert G. Johnston, Arnprior, CA;
Robert G. Johnston, Arnprior, CA;
Other;
Abstract
A stereo loudspeaker system with a right channel and a left channel respectively feeding R and L signals to four speakers (including a right main speaker, a right sub-speaker, a left main speaker and a left sub-speaker) includes a transformer that, depending on the frequency, magnetically couples or isolates the two channels at the right and left sub-speakers. At low frequencies, the transformer isolates the right channel from the left one so that the R signal goes primarily only to the two right speakers, and the L signal goes primarily only to the two left ones. At high frequencies, both the right and left main speakers still receive their respective R and L signals; however, the transformer's magnet coupling conveys a differential R-L signal to the right sub-speaker and a differential L-R signal to the left sub-speaker, thereby producing an expanded acoustic image and realistic ambient field.