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:
Nov. 17, 1987
Filed:
Jul. 15, 1986
Applicant:
Inventors:
Heinrich Pfeifer, Denzlingen, DE;
Rainer Schweer, Waldkirch, DE;
Assignee:
Deutsche ITT Industries GmbH, Freiburg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
329110 ; 329126 ; 329145 ; 375 80 ; 455214 ;
Abstract
A digital frequency demodulator circuit works on the principle of determining the number of zero crossings of a band-limited input signal in a given period of time, in corresponding prior art analog circuits. The circuit includes an analog-to-digital converter, three delay elements, two edge detectors, an up/down counter, two arcsin read-only memories, a 1/2 multiplier and a multiple adder.