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:
Dec. 19, 1989
Filed:
Oct. 03, 1988
Michael A Isnardi, Plainsboro, NJ (US);
Terrence R Smith, Westmont, NJ (US);
Jack S Fuhrer, Princeton Junction, NJ (US);
Barbara J Roeder, Point Pleasant, PA (US);
General Electric Company, Princeton, NJ (US);
Abstract
A system for transmitting and receiving signals representing a high-definition television (HDTV) image is disclosed. The signals are sent over two conventional 6 MHz NTSC channels. A first signal, the main signal, is developed by encoding circuitry from HDTV source signals to be compatible with existing NTSC receivers in that it produces a display on those receivers which is not significantly distorted. The main signal includes psychophysically hidden video information which may be used by an extended definition receiver to produce a widescreen image having a higher level of detail than a conventional video image. A second signal, the auxiliary signal, is developed at the transmitter by decoding the main signal and subtracting the decoded main signal from the original HDTV source signals. The auxiliary signal, which includes frequency components from 0 Hz to 20 MHz is split into three bands, A (0 Hz-6MHz), B (6 MHz-12 MHz) and C (12 MHz-18 MHz). Bands B and C are frequency converted to occupy the 0 Hz-6 MHz band and are time division multiplexed on a line by line basis. The combined B and C bands are then time division multiplexed with the A band on a frame by frame basis for still images. For moving images, only the A band is sent. The receiver decodes the main signal, and, using a motion signal sent with the main signal, decodes the auxiliary signal. The decoded main and auxiliary signals are combined to reproduce the HDTV image.