Systems for the generation of special effects in colour television

Claim 1

A SYSTEM FOR GENERATING SPECIAL EFFECTS BY MEANS OF SIGNALS SUPPLIED BY A FIRST AND A SECOND SOURCE IN A COLOUR TELEVISION SYSTEM WHEREIN THE COMPLEX VIDEO SIGNAL COMPRISES A LUMINANCE SIGNAL AND A SUB-CARRIER MODULATED BY A COLOUR SIGNAL, SAID MODULATED SUB-CARRIER OCCUPYING A FREQUENCY BAND WHICH IS INCLUDED, AT LEAST PARTIALLY, IN THE SPECTRUM OF SAID LUMINANCE SIGNAL, SAID SYSTEM COMPRISING: A FIRST AND A SECOND INPUT, HEREINAFTER REFERRED TO AS THE FIRST AND SECOND "GENERAL INPUTS," FOR APPLYING THERETO A FIRST AND A SECOND COMPLEX VIDEO SIGNAL RESPECTIVELY SUPPLIED BY SAID FIRST AND SECOND SOURCE, AND AN OUTPUT, HEREINAFTER REFERRED TO AS THE "GENERAL OUTPUT," ONTO WHICH THE COMPLEX VIDEO SIGNAL TO BE TRANSMITTED IS DIRECTED; A FIRST SPECIAL EFFECT SWITCH HAVING TWO SIGNAL INPUTS AND AN OUTPUT; A FIRST AND A SECOND CHANNEL HAVING RESPECTIVE INPUTS RESPECTIVELY COUPLED TO SAID FIRST AND SECOND GENERAL INPUTS, AND RESPECTIVE OUTPUTS RESPECTIVELY COUPLED TO SAID TWO SIGNAL INPUTS OF SAID FIRST SPECIAL EFFECT SWITCH; A THIRD CHANNEL COUPLED TO SAID OUTPUT OF SAID FIRST SPECIAL EFFECT SWITCH; TWO SERIES CIRCUITS, RESPECTIVELY FED BY SAID FIRST AND SECOND GENERAL INPUTS, FOR EXTRACTING THE MODULATED SUB-CARRIERS FROM SAID FIRST AND SECOND INPUT COMPLEX VIDEO SIGNALS AND DEMODULATING SAID SUB-CARRIERS, EACH OF SAID SERIES CIRCUITS HAVING AN OUTPUT AND COMPRISING A FILTER AND DEMODULATING MEANS; A SECOND SPECIAL EFFECT SWITCH HAVING TWO SIGNAL INPUTS RESPECTIVELY COUPLED TO SAID OUTPUTS OF SAID TWO SERIES CIRCUITS AND AN OUTPUT; MEANS FOR MODULATING A NEW SUB-CARRIER, SAID MODULATING MEANS HAVING A MODULATION INPUT COUPLED TO SAID OUTPUT OF SAID SECOND SPECIAL EFFECT SWITCH AND AN OUTPUT; FILTERING MEANS, HEREINAFTER REFERRED TO AS "BAND RESTRICTING FILTERING MEANS," SAID BAND RESTRICTING FILTERING MEANS BEING INSERTED IN N OF SAID CHANNELS, WHERE N IS A POSITIVE INTEGER SMALLER THAN THREE, AND BEING ADAPTED FOR ELIMINATING FROM THE OUTPUT SIGNAL OF SAID FIRST SPECIAL EFFECT SWITCH THOSE COMPONENTS WHICH ARE DUE TO THE SUB-CARRIERS INCLUDED IN SAID INPUT COMPLEX VIDEO SIGNALS, THE BAND-RESTRICTED SIGNAL RESULTING FROM THE OPERATION OF SAID BAND RESTRICTING FILTERING MEANS BEING HEREINAFTER REFERRED TO AS "SPECIAL EFFECT LUMINANCE SIGNAL"; AND FURTHER MEANS, CONTROLLED BY SWITCHING MEANS, REFERRED TO AS "OPERATING CONDITION SWITCHING MEANS," FOR SELECTIVELY: (A) SWITCHING SAID BAND RESTRICTING FILTERING MEANS OUT OF SAID N CHANNELS AND APPLYING TO SAID GENERAL OUTPUT THE OUTPUT SIGNAL OF SAID FIRST SPECIAL EFFECT SWITCH OR (B) LEAVING SAID BAND RESTRICTING FILTERING MEANS INSERTED IN SAID N CHANNELS AND ADDING SAID SPECIAL EFFECT LUMINANCE SIGNAL TO THE OUTPUT SIGNAL OF SAID MODULATING MEANS TO BUILD UP THE COMPLEX VIDEO SIGNAL WHICH IS APPLIED TO SAID GENERAL OUTPUT.

Claim 2

A SYSTEM FOR GENERATING SPECIAL EFFECTS BY MEANS OF SIGNALS SUPPLIED BY A FIRST AND A SECOND SOURCE IN A COLOUR TELEVISION SYSTEM WHEREIN THE COMPLEX VIDEO SIGNAL COMPRISES A LUMINANCE SIGNAL AND A SUB-CARRIER MODULATED BY A COLOUR SIGNAL, SAID MODULATED SUB-CARRIER OCCUPYING A FREQUENCY BAND WHICH IS INCLUDED, AT LEAST PARTIALLY, IN THE SPECTRUM OF SAID LUMINANCE SIGNAL, SAID SYSTEM COMPRISING: A FIRST AND A SECOND INPUT, HEREINAFTER REFERRED TO AS THE FIRST AND SECOND "GENERAL INPUTS," FOR APPLYING THERETO A FIRST AND A SECOND COMPLEX VIDEO SIGNAL RESPECTIVELY SUPPLIED BY SAID FIRST AND SECOND SOURCE, AND AN OUTPUT, HEREINAFTER REFERRED TO AS THE "GENERAL OUTPUT," ONTO WHICH THE COMPLEX VIDEO SIGNAL TO BE TRANSMITTED IS DIRECTED; A FIRST SPECIAL EFFECT SWITCH HAVING TWO SIGNAL INPUTS AND AN OUTPUT; A FIRST AND A SECOND CHANNEL HAVING RESPECTIVE INPUTS RESPECTIVELY COUPLED TO SAID FIRST AND SECOND GENERAL INPUTS, AND RESPECTIVE OUTPUTS RESPECTIVELY COUPLED TO SAID TWO SIGNAL INPUTS OF SAID FIRST SPECIAL EFFECT SWITCH; A THIRD CHANNEL COUPLED TO SAID OUTPUT OF SAID FIRST SPECIAL EFFECT SWITCH; TWO SERIES CIRCUITS, RESPECTIVELY FED BY SAID FIRST AND SECOND GENERAL INPUTS, FOR EXTRACTING THE MODULATED SUB-CARRIERS FROM SAID FIRST AND SECOND INPUT COMPLEX VIDEO SIGNALS AND DEMODULATING SAID SUB-CARRIERS, EACH OF SAID SERIES CIRCUITS HAVING AN OUTPUT AND COMPRISING A FILTER AND DEMODULATING MEANS; A SECOND SPECIAL EFFECT SWITCH HAVING TWO SIGNAL INPUTS RESPECTIVELY COUPLED TO SAID OUTPUTS OF SAID TWO SERIES CIRCUITS AND AN OUTPUT; MEANS FOR MODULATING A NEW SUB-CARRIER, SAID MODULATING MEANS HAVING A MODULATION INPUT COUPLED TO SAID OUTPUT OF SAID SECOND SPECIAL EFFECT SWITCH AND AN OUTPUT; FILTERING MEANS, HEREINAFTER REFERRED TO AS "BAND RESTRICTING FILTERING MEANS," SAID BAND RESTRICTING FILTERING MEANS BEING INSERTED IN N OF SAID CHANNELS, WHERE N IS A POSITIVE INTEGER SMALLER THAN THREE, AND BEING ADAPTED FOR ELIMINATING FROM THE OUTPUT SIGNAL OF SAID FIRST SPECIAL EFFECT SWITCH THOSE COMPONENTS WHICH ARE DUE TO THE SUB-CARRIERS INCLUDED IN SAID INPUT COMPLEX VIDEO SIGNALS, THE BAND-RESTRICTED SIGNAL RESULTING FROM THE OPERATION OF SAID BAND RESTRICTING FILTERING MEANS BEING HEREINAFTER REFERRED TO AS "SPECIAL EFFECT LUMINANCE SIGNAL"; AND FURTHER MEANS, CONTROLLED BY SWITCHING MEANS, REFERRED TO AS "OPERATING CONDITION SWITCHING MEANS," FOR SELECTIVELY: (A) SWITCHING SAID BAND RESTRICTING FILTERING MEANS OUT OF SAID N CHANNELS AND APPLYING TO SAID GENERAL OUTPUT THE OUTPUT SIGNAL OF SAID FIRST SPECIAL EFFECT SWITCH OR (B) LEAVING SAID BAND RESTRICTING FILTERING MEANS INSERTED IN SAID N CHANNELS AND ADDING SAID SPECIAL EFFECT LUMINANCE SIGNAL TO THE OUTPUT SIGNAL OF SAID MODULATING MEANS TO BUILD UP THE COMPLEX VIDEO SIGNAL WHICH IS APPLIED TO SAID GENERAL OUTPUT.