Velocity-modulated colour television receivers

Claim 1

A COLOUR TELEVISION RECEIVER HAVING A CATHODE RAY IMAGE REPRODUCING TUBE THE FLUORESCENT SCREEN OF WHICH COMPRISES A CYCLIC ARRAY OF PARALLEL PHOSPHOR STRIPS TRANSVERSE TO THE LINE SCANNING DIRECTION AND EMITTING DIFFERENT COLOURS WHEN EXCITED BY THE CATHODE RAY BEAM; MEANS FOR PRODUCING FROM RECEIVED TELEVISION SIGNALS A FIRST SIGNAL VARIABLE TO REPRESENT THE BRIGHTNESS OF THE PICTURE TO BE REPRODUCED AND A SECOND SIGNAL THE PHASE OF WHICH IS VARIABLE TO REPRESENT THE HUE OF THE PICTURE TO BE REPRODUCED AND THE AMPLITUDE OF WHICH IS VARIABLE TO REPRESENT THE SATURATION THEREOF; MEANS FOR PRODUCING A LINE SCANNING WAVEFORM FOR THE BEAM OF SAID TUBE HAVING A FIRST SUBSTANTIALLY LINEAR COMPONENT PERIODIC AT THE LINE SCANNING FREQUENCY, THEREBY TO TEND TO CAUSE THE BEAM TO CROSS THE CYCLES OF PHOSPHOR STRIPS WITH A PREDETERMINED FREQUENCY, AND A SECOND COMPONENT PERIODIC AT A CENTRE FREQUENCY EQUAL TO SAID PREDETERMINED FREQUENCY AND MODULATED IN PHASE IN RESPONSE TO THE PHASE VARIATIONS IN SAID SECOND SIGNAL, WHEREBY SAID CATHODE RAY BEAM IS CAUSED PREFERENTIALLY TO EXCITE A SELECTED STRIP OR SELECTED STRIPS IN EACH CYCLE OF SAID PHOSPHOR STRIPS BUT TO DWELL ON EACH CYCLE FOR A SUBSTANTIALLY CONSTANT TIME; SATURATION CONTROL MEANS FOR VARYING THE EXCITATION OF SAID SELECTED STRIPS RELATIVE TO THE EXCITATION OF THE WHOLE CYCLE OF PHOSPHOR STRIPS IN RESPONSE TO AMPLITUDE IN SAID SECOND SIGNAL; AND MEANS MODULATING THE INTENSITY OF THE CATHODE RAY BEAM IN RESPONSE TO SAID FIRST SIGNAL.