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:
Jan. 27, 1987
Filed:
Sep. 12, 1983
Engel Roza, Eindhoven, NL;
Hendrik G Van Veenendaal, Eindhoven, NL;
U. S. Philips Corporation, New York, NY (US);
Abstract
Head-end and receiver for a signal distribution system for signals having a wide frequency band and for accompanying signals having a narrow frequency band, such as the video signal and the sound signal of a television signal, respectively, digital signals being used for the distribution. The head-end comprises a first (4) and a second (5) A/D-converter for the signal having the wide frequency band and the signal having the narrow frequency band, respectively. The receiver comprises corresponding D/A-converters (13, 14). In order to avoid a specific frame structure and corresponding frame synchronization, the digital output signal of the second A/D-converter is modulated in a modulator (7) in the head-end on a subcarrier from a source (6) and thereafter added to the signal having the wide frequency band, and the combined signal is applied to the first A/D-converter (4) which is provided by a one-bit modulator. In the receiver the received digital signal is applied to a demodulator (17) via a bandpass filter (15), the demodulator output signal being applied to the second.