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:
Apr. 21, 1998
Filed:
Apr. 12, 1996
Applicant:
Inventor:
Peter Griesbaum, Phoenix, AZ (US);
Assignee:
Wavephore, Inc., Phoenix, AZ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
348731 ; 348726 ; 348473 ;
Abstract
An improved tuner for recovery of data having a data bandwidth embedded in a video signal transmitted in association with a video carrier frequency is disclosed. The entire video signal is shifted to the intermediate frequency bandwidth, thereby shifting the data bandwidth to an IF data bandwidth. The IF data bandwidth is then filtered to block as much of the spectrum of the IF signal that is outside of the IF data bandwidth. The filtered IF data bandwidth is then demodulated again using an IF carrier generated by a local oscillator that tracks frequency drift in the carrier.