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. 11, 1995
Filed:
Mar. 07, 1994
Applicant:
Inventors:
Seung-yup Koo, Seoul, KR;
Duck-young Jung, Incheon, KR;
Assignee:
Samsung Electronics Co., Ltd., Kyungki-do, KR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04H / ; H03L / ; H04R / ; H04B / ;
U.S. Cl.
CPC ...
381 12 ; 331 25 ; 381-1 ; 455260 ;
Abstract
A stereo and dual audio signal identifying system comprising, an FM detector, bandpass filter, and AM detector which generate a filter/detected input to a first PLL having a 210 Hz reference signal. The first PLL generates a first input to a comparator and a second PLL generates a second input to the comparator. The comparator generates an output signal indicative of the presence of stereo and dual audio signals.