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US3982064: Combined television/data transmission system

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Filing Information

Inventor(s) Bernard Sydney Barnaby ·
Assignee(s) The General Electric Company Limited ·
Attorney/Agent(s) Kirschstein, Kirschstein, Ottinger & Frank ·
Primary Examiner Robert L. Griffin ·
Assistant Examiner John C. Martin ·
Application Number US5503376
Filing date 09/05/1974
Issue date 09/21/1976
Predicted expiration date 09/05/1994
U.S. Classifications 178/56  ·
International Classifications H04N 700  ·
Kind CodeA
International Classifications 1785.6;5.8;DIG. 23;69.5 R;69.5 TV;6;6.8 ·
Related U.S. Application DataCROSS-REFERENCE TO RELATED APPLICATION
This application is related to co-pending application Ser. No. 503,172 filed Sept. 4, 1974 for COMBINED TELEVISION/DATA RECEIVERS by Bernard Sydney Barnaby and Donald Gordon Scott.
Foreign Priority UK4144573 - 09/04/1973 ·
7 Claims, No Drawings


Abstract

A television transmission system of the kind in which some of the line scan periods of a conventional transmission that are left blank (as far as picture content is concerned) between successive frame transmissions are utilized for signalling data for selective display on the screen of a television receiver. The improvement over previous systems is that the information to be displayed as a line of data may be transmitted in a single line scan period. This is achieved by transmitting in a line scan period a page number and then in subsequent line scan periods the lines of data for that page. New page numbers are then transmitted followed by their respective lines of data in sequence. A receiver for the transmission system is described.

Independent Claims | See all claims (7)

  1. 1. A combined television/data transmission system for a television signal in which information characterizing a page of data to be displayed is digitally coded and transmitted in line scan periods that do not have picture information, in which each said page of data comprises a number of rows of data, each page of data being transmitted by transmitting a respective page address in a first said line scan period that does not have picture information, one or more subsequent periods of said line scan periods being utilized to transmit information relating to said rows of data, the information transmitted during each subsequent line scan period relating to a complete row of data in said respective page and containing in addition the row address in digitally coded form but not said respective page address, the end of transmission of a page of data being identified by a further one of said line scan periods in which a further page address is transmitted.
  2. 7.7. A transmitter for a combined television/data system in which information characterizing a page of data to be displayed is digitally coded and transmitted in television line scan periods that do not have picture information in which each page of data comprises a number of rows of data, each page of data being transmitted by transmitting a respective page address in a first said line scan period that does not have picture information, one or more subsequent periods of said line scan periods being utilized to transmit information relating to said rows of data, the information transmitted during each subsequent line scan period relating to a complete row of data in said respective page and containing in addition the row address in digitally coded form but not said respective page address, the end of transmission of a page of data being identified by a further one of said line scan periods in which a further page address is transmitted, said transmitter includingA. line and frame synchronizing means to synchronize the transmission of the television video signals on a suitable video carrier frequency signal,B. a timing circuit to synchronize transmission of data signals during one or more specified line scan periods during the vertical blanking interval of said television video signals,C. a parallel-to-serial shift register into which data to be transmitted is fed in parallel,D. a page counter,E. a row counter controlled by said timing circuit,F. a random access memory, the outputs of said page and line counters being used to address associated portions of said random access memory, the information from said memory being stored in a part of said register,G. a synchronizing and start circuit being connected to feed synchronizing and start signals into a further part of said register,H. a combining circuit, said information in said register being combined with said video carrier frequency signal in said combining circuit under the control of said timing circuit to produce an output data signal during one or more specified line scan periods during said vertical blanking interval, in which in each portion of said memory associated with the first row of each page the page address is stored in digital form together with auxiliary information in digital form and in which in the portions of said memory associated with the subsequent rows of each page the row address is stored in digital form together with the data contained in each respective row in digital form, and in which the information contained in the associated portions of said memory is transferred to said register under the control of said page and line counters for transmission during said first and said subsequent line scan periods.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3345458 Cole et al. Oct 1967
US3491199 XEROX CORP Weinstein Jan 1970
US3493674 RCA CORP Houghton Feb 1970
US3575554 COMMUNICATIONS SATELLITE CORP Schmidt Apr 1971
US3792443 HONEYWELL INC Breikss Feb 1974
US3848082 Summers Nov 1974

Referenced By

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Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
US3982064 The General Electric Company Limited Bernard Sydney Barnaby Sep 1976
GB1467240 GEN ELECTRIC CO LTD Mar 1977