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. 12, 1988
Filed:
Oct. 09, 1986
John R Kinghorn, Ashtead, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
A teletext decoder for full-channel operation includes a 'row-found' register in which a flag is put for each data row which is actually present in a selected teletext page that is received and stored in the page memory of the decoder. The decoder further includes control means which on read-out from the page memory allows the utilisation of only those data rows of the stored page for which there is a flag in the 'row-found' register. Because teletext pages can contain different numbers of data rows, it is normally necessary to empty the page memory before a selected new page is received and stored since otherwise data rows of a stored old page which are not over-written by corresponding data rows of the new page would be included in the data read out for the new page. The provision of a flag for each received data row of the new page and the action of the control means prevents this happening. It then becomes unnecessary to delay reception of a new page until an old page has been removed from the page memory. Means are also provided for taking account of parity errors in received character data codes.