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:
Dec. 20, 1977
Filed:
May. 29, 1975
Applicant:
Inventor:
Lawrence S Schmitz, Pittsburgh, PA (US);
Assignee:
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
3403 / ; 3402 / ; 340276 ; 340420 ;
Abstract
A solid state noise generator circuit responds to digital signals indicative of alarm conditions, by initiating frequency modulated digital audio output waveforms distinctly identifying the monitored condition to provide audible recognition of each alarm condition. Each distinct alarm condition results in the application of a different combination of outputs of one multistage counter as preset inputs to a second multistage counter to uniquely frequency modulate the digital square wave input driving the second multistage counter to produce the distinctive frequency modulated digital audio output waveform.