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:
Jun. 21, 1994
Filed:
Mar. 29, 1993
Applicant:
Inventors:
David B Choate, Salvisa, KY (US);
James B Tsui, Dayton, OH (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 7622 ; 324 7635 ; 324 7621 ; 342 20 ; 342 13 ; 364484 ;
Abstract
This is an arrangement to find two folding frequencies that fold into one frequency bin, which will save hardware. The input frequency in down converted into I and Q channels. Each channel requires one pair (two) of A/D converters. A total of three pairs of A/D converters are required. All three pairs of A/D converters have the SAME sampling frequency f.sub.s. There is a time delay of .tau. before the second pair of A/D converters, and 2.tau. before the third pair. At the outputs of the A/D converters FFT units followed by a signal processor are used to find the input frequencies by solving non-linear simultaneous equations.