logo

For the Inventor, By the Inventor

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.:

US 5473615 B1

PDFFull Text
Date of Patent:
Dec. 05, 1995

Filed:

Mar. 17, 1993

Digital supervisory audio tone detector

Applicant:
Inventors:

Brian E Boyer, Alpharetta, GA (US);

Stephen T Dedier, Lilburn, GA (US);

John F Paulos, Roswell, GA (US);

Gregory S Smith, Atlanta, GA (US);

Charles L Warner, II, Stone Mountain, GA (US);

Assignee:

Matsushita Communication Industrial Corporation of America, Peachtree City, GA (US);

Attorney:

Jones & Askew

Primary Examiner:

Emanuel T Voeltz

Assistant Examiner:

Craig Steven Miller

Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371-51 ; 371 471 ; 371 42 ; 371 46 ; 375351 ; 455 351 ; 455218 ;
Abstract

A detector for determining the validity of a received code, such as a Digital Supervisory Audio Tone (DSAT) code. A received DSAT code is serially shifted into a shift register (10) which outputs the received DSAT code in parallel format to a set of 24 exclusive-OR gates (12). Another shift register (11) receives a valid code, such as a valid DSAT code. The register (11) outputs the valid DSAT code, and right circular shifted (rotated) versions of the valid DSAT code, to the gates (12). The comparison signal from the gates (12) is provided to another register (13) and a counter (16) which together count the number of mismatches between the received DSAT code and the reference DSAT codes. The output of the counter (16) is provided to a comparator (17) which compares the number of mismatches against the allowable number of mismatches. The output of the comparator (17) is a validity signal (7) which indicates whether the received DSAT code matches any of the reference DSAT codes. Either the received code or the reference code may be used to provide the rotated codes.

Find Patent Forward Citations

Boyer, Brian. (1995). Digital supervisory audio tone detector (U.S. Patent No. 5473615). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5473615

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Loading…