System for removing vertical vibrations from reproduced video

A video signal processing system for processing a reproduced composite NTSC color video signal containing a luminance signal and a chrominance signal and having at least one type of television field containing television lines, said at least one type of television field being one of an odd field or an even field, comprising:

• reference synchronizing signal generating means for generating a reference synchronizing signal operative to define a plurality of types of reference television fields in a predetermined repeating order, said reference synchronizing signal generating means including means for generating a color subcarrier of the NTSC system;
• means for separating said luminance signal and said chrominance signal from said reproduced video signal;
• means for detecting non-coincidence between a characteristic of said at least one type of reproduced television field and one of said plurality of types of reference television fields and for producing a signal in response thereto;
• means for mixing reproduced video signals of an adjacent two of said television lines to produce an interpolated signal formed of at least one of an interpolated luminance signal and in interpolated chrominance signal, said means for mixing including luminance mixing emans for mixing at least said luminance signal from an adjacent two of said television lines to produce said interpolated luminance signal and chrominance mixing means for mixing said chrominance signal from an adjacent two of said television lines to produce said interpolated chrominance signal;
• and selective means for selectively producing output video signals containing only one of said reproduced video signal and said interpolated video signal in response to said signal from said means for detecting.

Video signal reproducing apparatus for reproducing a video signal having odd type and even type television fields each containing television lines and being recorded in slant tracks on a magnetic recording medium, so that successive tracks alternately contain recorded odd type fields and even type fields, the apparatus comprising:

• guide drum means on which said recording medium is wrapped for translational motion thereabout at a normal speed in which said odd and even type fields are reproduced to alternate with one another and at an other-than-normal speed in which successive fields of one of said odd and said even type occur in said video signal as reproduced from said recording medium;
• at least one rotary magnetic reproducing head on said guide drum means mounted so as to follow said slant tracks when said medium is translationally moved at said normal speed, and to reproduce said video signal recorded therein;
• deflection means deflectably mounting said at least one reproducing head on said guide drum means and deflecting said reproducing head so that the latter follows said slant tracks when said medium is translationally moved at said other-than-normal speed;
• and
• means for eliminating perceived vertical vibration in said reproduced video signal, including reference synchronizing signal generating means for generating a reference synchronizing signal operative to define a plurality of types of reference television fields in a predetermined repeating order;
• means for detecting non-coincidence between a characteristic identifying the type of television field then being reproduced and a characteristic identifying the type of reference television field then being generated and for producing a signal in response to detected non-coincidence of such characteristics;
• means for mixing reproduced video signals of an adjacent two of said television lines to produce an interpolated video signal representing an average of the video signals of said adjacent two television lines;
• and means for selecting as an output video signal, in response to said signal from said means for detecting, said interpolated video signal when said non-coincidence is detected and said reproduced video signal when said coincidence is detected.