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:
Sep. 06, 1988
Filed:
Jun. 29, 1987
Applicant:
Inventor:
Karl R Weiss, Sunrise, FL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; G06F / ;
U.S. Cl.
CPC ...
328138 ; 328133 ; 328140 ; 307520 ; 307522 ; 36472409 ; 36472803 ;
Abstract
This tone decoder utilizes three correlators for detecting the presence of a desired tone signal. A main correlator correlates to the desired tone frequency, while two side correlators are used to correlate to frequencies above and below the desired tone frequency. Tone detection is indicated by correlation of the main correlation and absence of correlation by the side correlators. Improved bandwidth and/or correlation time is achieved as compared to utilizing a single correlator.