Color television systems

Claim 1

AN ELECTRICAL SYSTEM FOR TRANSMITTING A COLOR TELEVISION IMAGE COMPRISING MEANS HAVING A LIGHT INPUT CHANNEL AND HAVING FIRST, SECOND AND THIRD ELECTRICAL OUTPUT CHANNELS, SAID MEANS INCLUDING A CAMERA SYSTEM FOR SCANNING SUCCESSIVELY ARRANGED ELEMENTS OF SAID IMAGE AND COMPRISING BETWEEN SAID INPUT CHANNEL AND SAID FIRST OUTPUT CHANNEL AN ELECTRO-OPTICAL TRANSMISSION PATH HAVING A TRANSFER CHARACTERISTIC IN THE FORM OF A FIRST COLOR MIXTURE CURVE HAVING A SHAPE AND ORDINATE SCALE SUBSTANTIALLY IDENTICAL TO THE SHAPE AND ORDINATE SCALE OF THE CURVE OF RELATIVE LUMINOSITY OF THE SPECTRAL COLORS TO THE EYE THEREBY TO PRODUCE AT SAID FIRST OUTPUT CHANNEL A FIRST SIGNAL PROPORTIONAL TO THE ENERGY DISTRIBUTION, OF LIGHT EMITTED BY THE ELEMENTS OF SAID IMAGE AS WEIGHTED BY THE SAID FIRST COLOR MIXTURE CURVE, SAID MEANS FURTHER COMPRISING BETWEEN SAID INPUT CHANNEL AND SAID SECOND AND THIRD OUTPUT CHANNELS ELECTRO-OPTICAL TRANSMISSION PATHS HAVING TRANSFER CHARACTERISTICS IN THE FORM OF SECOND AND THIRD COLOR MIXTURE CURVES HAVING SHAPES AND ORDINATE SCALES COMPLEMENTING THE SHAPE AND ORDINATE SCALE OF SAID FIRST CURVE AND DEFINING WITH SAID FIRST CURVE THE CHROMATICITY OF THE IMAGE ELEMENTS THEREBY TO PRODUCE AT SAID SECOND AND THIRD OUTPUT CHANNELS SECOND AND THIRD SIGNALS PROPORTIONAL TO THE ENERGY DISTRIBUTION OF LIGHT EMITTED BY THE ELEMENTS OF SAID IMAGE AS WEIGHTED BY SAID SECOND AND THIRD COLOR MIXTURE CURVES RESPECTIVELY, MEANS TO AMPLITUDE MODULATE A FIRST CARRIER WAVE IN ACCORDANCE WITH AMPLITUDE VARIATIONS OF SAID SECOND SIGNAL, AND FIRST CARRIER WAVE HAVING A GIVEN FREQUENCY VALUE ARRANGED AT ONE END OF THE FREQUENCY SPECTRUM OF SAID FIRST SIGNAL AND HAVING A GIVEN PHASE POSITION, MEANS TO AMPLITUDE MODULATE A SECOND CARRIER WAVE IN ACCORDDANCE WITH AMPLITUDE VARIATIONS OF SAID THIRD SIGNAL, SAID SECOND CARRIER WAVE HAVING SAID GIVEN FREQUENCY VALUE AND HAVING A PHASE POSITION DISPLACED RELATIVE TO THE PHASE POSITION OF SAID FIRST CARRIER WAVE, AND MEANS TO COMBINE SAID FIRST SIGNAL AND SAID AMPLITUDE MODULATED CARRIER WAVES THEREBY TO PRODUCE A COMPOSITE VIDEO WAVE INDICATIVE TO THE LUMINOSITY AND CHROMATICITY OF THE SAID SUCCESSIVELY SCANNED ELEMENTS OF SAID IMAGE.