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:
Mar. 19, 1991
Filed:
Jul. 07, 1989
Detlev Otto, Knoxville, TN (US);
North American Philips Corporation, New York, NY (US);
Abstract
An apparatus for encoding and transmitting video signals including a circuit for separating the video signals into two complementary signals for processing in two separate transmission paths; in a first of the paths, a circuit for separating a portion of one of the two complementary signals corresponding to a standard video signal; and a circuit for transmitting this portion over a first standard transmission channel; and in a second of the paths, a circuit for dividing the other of the two complementary signals into consecutive intervals, each interval having a predetermined time duration; a circuit for time delaying every other one of the intervals for the predetermined time interval such that consecutive two intervals of the video signal appear simultaneously; a circuit for time expanding the pairs of intervals by a factor of two thereby reducing the bandwidth thereof by one-half; a circuit for amplitude modulating in quadrature each pair of intervals onto a carrier having a frequency located in the middle of the transmission band; and a circuit for transmitting the quadrature modulated signal over a second standard transmission channel. An apparatus for receiving the encoded high definition television signals is also provided and includes a circuit for inversely decoding the signals on the first channel, a circuit for inversely decoding the signals on the second channel, and a circuit for combining the output of the two decoding circuits.