Slow down processor for video disc mastering having color phase error detector/corrector

A slow down processor, comprising, in combination:

• tape recorder means operable in a slow motion playback mode for producing a redundant field composite video signal comprising sequential sets of fields, each field being produced at a standard field, rate, each set of fields normally comprising a predetermined number of similar fields but being subject to anomalous variation of the number of fields per set;
• frame storage means, responsive to said redundant field video signal and to a control signal produced by said tape recorder means, for storing a selected field of each set of fields and for reproducing the stored selected fields at a field rate less than said standard field rate to provide a non-redundant field video output signal of reduced bandwidth, said frame storage means being of a type in which the color burst component of the composite video signal supplied thereto is not stored but is regenerated by color subcarrier regenerator means and added by adder means to the reproduced video output signal;
• detector means responsive to a normally symmetrical chroma invert control signal produced by said tape recorder means for detecting changes in the symmetry thereof and producing a second control signal;
• and
• inverter means responsive to said second control signal for inverting the phase of the regenerated color burst component of said non-redundant video output signal when said second control signal is present.

A slow down processor, comprising, in combination:

• tape recorder means operable in a slow motion playback mode for producing a redundant field composite video signal comprising sequential sets of fields, each field being produced at a standard field rate, each set of fields normally comprising a predetermined number of similar fields but being subject to anomalous variations of the number of fields per set;
• frame storage means, responsive to said redundant field video signal and to a control signal produced by said tape recorder means, for storing a selected field of each set of fields and for reproducing the stored selected fields at a field rate less than said standard field rate to provide a non-redundant field video output signal of reduced bandwidth, said frame storage means being of a type in which the color burst component of the composite video signal supplied thereto is not stored but is regenerated by color subcarrier regenerator means and added by adder means to the reproduced video output signal;
• divider means responsive to a reference signal supplied thereto for producing a symmetrical output signal;
• comparison means for comparing said symmetrical signal produced by said divider means with a normally symmetrical chrominance inverter control signal produced by said tape recorder means for detecting variations in the symmetry of said control signal and producing a trigger signal;
• bistable means responsive to said trigger signal for producing a second control signal having a period substantially equal to one field of said reproduced video output signal;
• and
• inverter means responsive to said second control signal for inverting the phase of the regenerated color burst component of said non-redundant video output signal when said second control signal is present.