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:
Feb. 13, 1990
Filed:
Dec. 22, 1988
Sonke Mehrgardt, March, DE;
Dietmar Ehrhardt, Freiburg, DE;
Deutsche ITT Industries GmbH, Freiburg, DE;
Abstract
A television receiving section includes only a single A/D converter, and, thus, only a single interface between the analog portion and the digital portion. Preferably, the A/D converter is positioned after the intermediate-frequency stage of the television receiving section. The A/D converter is clocked at about 20 MHz. The digital portion of the television receiving section includes a video channel and an audio channel. The video channel includes at its input end a band-pass filter whose passband extends from 1 MHz to 6 MHz and whose output signals are fed directly and through a 90.degree. phase shifter to a first absolute-value stage, which delivers the digital composite color signal. The audio channel includes at its input end a quadrature mixer (operating from a locally generated clock having a frequency of 7 MHz to 7.5 MHz) whose two output signals are fed through a first decimator and a second decimator, respectively, to a second absolute-value stage and an angle-computing stage. The output of the angle-computing stage delivers a frequency-demodulated audio signal through a differentiating stage. The output of the second absolute-value stage provides an amplitude-demodulated audio signal.