Television receiver comprising a teletext decoding circuit and a page number memory

• US 4,701,794 A
• Filed: 04/12/1985
• Issued: 10/20/1987
• Est. Priority Date: 01/09/1985
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Schmitz, Herman J. R., Froling, Melchert H.
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): Peng, John K.
• Application Number:
  US06/722,636
• Time in Patent Office: 921 Days
• Field of Search: 358/12, 358/141, 358/142, 358/146, 358/147
• US Class Current: 348/468
• CPC Class Codes: H03J 1/0008 using a central processing unit, e.g. a microprocessor digital tuning in general H03J5/0245
• CPC Class Codes: H04N 7/0882 for the transmission of character code signals, e.g. for teletext circuits for the digital non-picture data signal H04N7/035

Abstract

A television receiver which is suitable for displaying teletext pages comprises a control system including a microcomputer. The microcomputer is coupled to a volatile memory which comprises a plurality of page number registers. A page number can be temporarily stored in each of these registers. With the aid of a keyboard the user makes known which page numbers he wants to have stored in the different registers and the stored page numbers represent a first series of pages. One single read key (RCL) is provided for the display of such a page. Each time this key is depressed once, a different page belonging to the first series appears on the picture screen. The sequence in which the pages appear is the same as the sequence in which the user has keyed-in the relevant page numbers. This sequence can be interrupted by the occurrence of a preselected operating instruction in response to which a number of teletext pages not associated with said first series can be displayed on the picture screen. Thereafter, the display of the teletext pages of the first series can be continued.

Claims

1. A television receiver comprising:

a control system for generating in response to external manipulations control instructions including teletext page numbers of teletext pages to be displayed on said television receiver;

a teletext-decoder circuit having a page number input for receiving from said control system page numbers of teletext pages to be displayed and having a picture output applying the picture signal of the teletext page to be displayed;

a picture screen coupled to display the picture signal from the picture signal output of the teletext decoder circuit, said picture screen displaying a teletext page which is identified by an associated page number;

page number storage means for storing a plurality of page number; and

a programmable control circuit coupled to the page number storage means and to the control system for receiving the control instructions, and to said page number input of the teletext decoder circuit to apply teletext page numbers thereto, the control circuit being programmed for carrying out the steps of;

storing in the page number storage means a first series of preselected teletext page numbers selected by a user in the order in which the corresponding teletext pages are desired for display;

successively applying the teletext page numbers of said first series to the teletext-decoder in response to successive occurrences of a selected first control instruction for successively displaying the teletext pages corresponding to the teletext page numbers successively applied to the teletext-decoder;

interrupting the successive application of teletext page numbers of said first series to the teletext-decoder in response to the occurrence of a selected further control instruction;

storing intermediate teletext page numbers in the order in which the corresponding teletext pages are desired for display;

successively applying the intermediate teletext page number to the teletext-decoder in response to successive further occurrences of the selected control instruction; and

continuing the successive application of the remainder teletext page numbers of said first series to the teletext decoder after all the intermediate teletext page numbers have been applied thereto.

2. A television receiver as claimed in claim 1, in which the storage means comprises N registers, each register storing a teletext page number, whereby registers storing teletext page numbers selected by the user are defined to be occupied registers and whereby the remaining registers are defined to be non-occupied registers, the control circuit is further programmed for:

making a register non-occupied in response to each occurrence of the selected first control instruction,

generating a sequence of further page numbers S+1, S+2, S+3, . . . in which S represents the last teletext page number of the first sequence; and

storing the teletext page numbers S+1, S+2, . . . S+(N-M) in the respective non-occupied registers, where M is the actual number of occupied register.