NL7710959A - Chromatic key signal generator for colour TV - has switch=over circuit linking second video source via controlled amplifier linked to matrix circuit - Google Patents

Chromatic key signal generator for colour TV - has switch=over circuit linking second video source via controlled amplifier linked to matrix circuit

Info

Publication number
NL7710959A
NL7710959A NL7710959A NL7710959A NL7710959A NL 7710959 A NL7710959 A NL 7710959A NL 7710959 A NL7710959 A NL 7710959A NL 7710959 A NL7710959 A NL 7710959A NL 7710959 A NL7710959 A NL 7710959A
Authority
NL
Netherlands
Prior art keywords
circuit
signal generator
switch
key signal
colour
Prior art date
Application number
NL7710959A
Other languages
Dutch (nl)
Original Assignee
Philips Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Nv filed Critical Philips Nv
Priority to NL7710959A priority Critical patent/NL7710959A/en
Publication of NL7710959A publication Critical patent/NL7710959A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/74—Circuits for processing colour signals for obtaining special effects
    • H04N9/75—Chroma key

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

A chroma-key switch over circuit which consists of a chroma-key signal generator and a changeover switch with two inputs. The inputs are connected to two video signal sources. The key signal generator contains a matrix circuit which will produce a brightness signal for one of the video sources. There is a colour difference circuit to form a composite colour difference of the first video signal. There is also a threshold circuit which functions in conjunction with the chromatic signals. The second input of the changeover switch (20) is connected to the second input of the circuit for linking the second video signal source (5) via a controlled amplifier (24). The amplifier has controlled input linked to the output of the matrix circuit within the brightness signal via another amplifier with adjustable limits.
NL7710959A 1977-10-06 1977-10-06 Chromatic key signal generator for colour TV - has switch=over circuit linking second video source via controlled amplifier linked to matrix circuit NL7710959A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7710959A NL7710959A (en) 1977-10-06 1977-10-06 Chromatic key signal generator for colour TV - has switch=over circuit linking second video source via controlled amplifier linked to matrix circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7710959A NL7710959A (en) 1977-10-06 1977-10-06 Chromatic key signal generator for colour TV - has switch=over circuit linking second video source via controlled amplifier linked to matrix circuit

Publications (1)

Publication Number Publication Date
NL7710959A true NL7710959A (en) 1978-10-31

Family

ID=19829302

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7710959A NL7710959A (en) 1977-10-06 1977-10-06 Chromatic key signal generator for colour TV - has switch=over circuit linking second video source via controlled amplifier linked to matrix circuit

Country Status (1)

Country Link
NL (1) NL7710959A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014665A1 (en) * 1979-02-12 1980-08-20 Etablissement Public Télédiffusion de France Method and system for picture overlay in colour television
US5218432A (en) * 1992-01-02 1993-06-08 Tandy Corporation Method and apparatus for merging video data signals from multiple sources and multimedia system incorporating same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014665A1 (en) * 1979-02-12 1980-08-20 Etablissement Public Télédiffusion de France Method and system for picture overlay in colour television
FR2448821A1 (en) * 1979-02-12 1980-09-05 Telediffusion Fse METHOD AND SYSTEM FOR INTEGRATING COLOR TELEVISION IMAGES
US5218432A (en) * 1992-01-02 1993-06-08 Tandy Corporation Method and apparatus for merging video data signals from multiple sources and multimedia system incorporating same
WO1993013627A1 (en) * 1992-01-02 1993-07-08 Tandy Corporation Method and apparatus for merging video data signals from multiple sources and multimedia system incorporating same

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Legal Events

Date Code Title Description
BV The patent application has lapsed