Television signal processing system including modulated auxiliary carrier

In a system for processing a color television signal, apparatus comprising;

• means for providing a chrominance subcarrier signal at a given frequency modulated with television information;
• means for providing first and second auxiliary carriers at said given frequency;
• first signal processing means responsive to said first auxiliary carrier and to television information for providing a first auxiliary carrier modulated with television information and exhibiting field rate modulation and a significant phase shift relative to said chrominance subcarrier;
• second signal processing means responsive to said second auxiliary carrier and to television information for providing a second auxiliary carrier modulated with television information and exhibiting field rate modulation and a significant phase shift relative to said chrominance subcarrier;
• means for combining said modulated first and second auxiliary carriers to produce a composite modulated auxiliary carrier;
• and
• means for combining said modulated chrominance subcarrier and said composite modulated auxiliary carrier, wherein
• said first and second auxiliary carriers are respectively modulated with first and second types of color difference information.

In a system for processing a color television signal, apparatus comprising:

• means for providing an amplitude and phase modulated chrominance subcarrier;
• means for phase shifting said modulated chrominance subcarrier approximately 90.degree. to produce a phase shifted signal;
• means for amplitude limiting said phase shifted signal to produce a limited signal;
• means for filtering said limited signal to produce a substantially sinusoidal signal;
• means for amplitude modulating said sinusoidal signal with television information to produce a modulated signal;
• and
• means for inverting the phase of said modulated signal from field to field.

In a receiver for processing a color television signal including a chrominance subcarrier at a given frequency modulated with television information, and a composite auxiliary signal comprising first and second field phase modulated auxiliary carriers at said given frequency exhibiting a significant phase shift relative to said chrominance subcarrier independent of field phase modulation and being modulated with television information;

• apparatus comprising:
• means responsive to said television signal and to first and second field phase controlled reference signals respectively for demodulating said first and second auxiliary carriers to provide demodulated auxiliary information;
• means responsive to said television signal and to a chrominance reference signal for demodulating said chrominance subcarrier to provide demodulated chrominance information;
• and
• video signal processing means responsive to said demodulated auxiliary information and to said demodulated chrominance information for producing an image representative signal.

In a receiver for processing a color television signal including a chrominance subcarrier at a given frequency modulated with television information, and a composite auxiliary signal comprising first and second field phase modulated auxiliary carriers at said given frequency exhibiting a significant phase shift relative to said chrominance subcarrier and being modulated with television information;

• apparatus comprising:
• means responsive to said television signal and to first and second field phase controlled reference signals respectively for demodulating said first and second auxiliary carriers to provide demodulated auxiliary information;
• means responsive to said television signal and to a chrominance reference signal for demodulating said chrominance subcarrier to provide demodulated chrominance information;
• and
• video signal processing means responsive to said demodulated auxiliary information and to said demodulated chrominance information for producing an image representative signal, wherein
• said demodulated auxiliary signals contain first and second types of color difference signal information, respectively.

In a receiver for processing a color television signal including a chrominance subcarrier at a given frequency modulated with television information, and a composite auxiliary signal comprising first and second field phase modulated auxiliary carriers at said given frequency exhibiting a significant phase shift relative to said chrominance subcarrier and being modulated with television information;

• apparatus comprising:
• means responsive to said television signal and to first and second field phase controlled reference signals respectively for demodulating said first and second auxiliary carriers to provide demodulated auxiliary information;
• means responsive to said television signal and to a chrominance reference signal for demodulating said chrominance subcarrier to provide demodulated chrominance information;
• and
• video signal processing means responsive to said demodulated auxiliary information and to said demodulated chrominance information for producing an image representative signal, wherein
• said demodulated television chrominance signal contains an "I" color difference component and a "Q" color difference component;
• said demodulated auxiliary signal contains side panel "I" color difference information and
• said demodulated additional auxiliary signal contains side panel "Q" color difference information.