Method and a device for symbol introduction in a programme telev

Details Method and a device for symbol introduction in a programme telev Method and a device for symbol introduction in a programme telev

1989-02-06

1990-12-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 522

Patent

active

049807668

ABSTRACT:
A method of and an apparatus for introducing symbols into a television program signal detects the instantaneous brightness Y.sub.A of a television program signal and before mixing that signal with a symbol signal to achieve a brightness E of the image, shapes the symbol signals so that it has a brightness level B.ltoreq.(E-Y.sub.A) where E is the brightness of the symbol in the image. Only then is the symbol with brightness level B added to the television signal A to form the mixed or added signal B+A.

REFERENCES:
patent: 3465097 (1969-09-01), Brabon et al.
patent: 3602646 (1971-08-01), Goldberg
patent: 3936868 (1976-02-01), Thorpe
patent: 4218698 (1980-08-01), Bart et al.
patent: 4520397 (1985-05-01), Hibi
patent: 4827344 (1989-05-01), Astle et al.
Michael Cox-England-Dgr No. C6368 A3 -Secam Subtitle Inserter-Technical Manual-6.12.83-Issue Blk. Oiag PPC.
Robert Bosch GmbH-Dortmund 3.3.1981-Zeichenzusatzer XC ZV 63A, Dokumentation FDL60 A 4-13182-00--SK.
Michael Cox-England-Dgr. No. C6368 A3-Secam Subtitle Inserter-Technical Manual-6.12.83-Issue Blk. Oiag PPC.
Robert Bosch GmbH-Dortmund 3.3. 1981-Zeichenzusatzer XC ZV 62A Dokumentation FLD60 A 4-13182-00-SX.

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