Method and apparatus for recovering information from a videodisc

A method for recovering recorded information from a plurality of spiralling and substantially circular recorded video information tracks or concentric circular recorded vidoe information tracks formed in a record disc, wherein each of the tracks includes at least two fields of information, and for reproducing a selected portion of the recorded information in a field stepwise fashion, comprising the steps of:

• rotating the disc;
• providing a means for recovering said fields of recorded information from the information tracks;
• moving the disc and said information recovery means radially relative to each other, to recover successive ones of said fields of information;
• reproducing said recovered fields of information;
• generating a stop-motion enable signal, to thereby initiage the stop-motion mode;
• repeatedly reproducing the next two fields of information recovered subsequent to said generating step, said next two fields being defined as fields C and D, said fields C and D comprising a first information track;
• genernating a field-step-enable signal;
• incrementally jumping said information recovery means, in response to said field-step-enable signal, to a second information track containing two fields D and E of information, wherein said fields E and C are adjacent to opposite ends, respectively, of said field D;
• and
• repeatedly reproducing said two fields D and E.

A method for recovering recorded information from a plurality of spirally and substantially circular recorded video information tracks or concentric circular recorded video information tracks formed in a record disc, wherein each of the tracks in cludes at least two fields of information, and for reproducing a selected portion of the recorded information in a field stepwise fashion, comprising the steps of:

• rotating the disc;
• providing a means for recovering selected fields of recorded information from the information tracks;
• moving the disc and said information recovery means radially relative to each other, to recover successive ones of said fields of information;
• reproducing said recovered fields of information;
• generating a stop-motion enable signal, to thereby initiate the stop-motion mode;
• repeatedly reproducing the next two fields of information recovered subsequent to said generating step, said next two fields being defined as fields C and D, said fields C and D comprising a first information track;
• generating a field-step-enable signal;
• incrementally jumping said information recovery means, in response to said field-step-enable signal, to a second information track containing two fields B and C of information, wherein said first and said second information tracks each contain said field C;
• and
• repeatedly reproducing said two fields B and C.

An apparatus for recovering recorded information from a plurality of spiralling and substantially circular recorded video information tracks or concentric circular recorded video information tracks formed in a record disc, wherein each of the tracks includes at least two fields of information, wherein each pair of adjacent fields encompassed by all of the information tracks are separated by a vertical interval, and for repetitively reproducing any two adjacent fields of information, in a stop-motion mode, comprising:

• means for rotating the disc;
• means for impinging an incident reading beam of radiation upon the rotating disc to produce a modulated beam of reflected radiation indicative of the recorded information;
• means for moving said reading beam and the disc radially relative to each other, to thereby cause said reading beam to impinge upon successive ones of the tracks;
• means for recovering said modulated beam;
• means operatively connected to said recovering means for reproducing the recorded video information represented by said recovered modulated beam;
• means for generating a stop-motion enable signal to initiate the stop motion mode;
• means for providing a control signal coincident with each occurrence of said reading beam impinging upon a location on an information track corresponding to a point in the interval between adjacent fields of information;
• means for generating a field step enable signal to selectively operate in a field stop mode;
• means for detecting each said control signal provided subsequent to generation of said stop-motion signal;
• means for alternately passing and blocking said detected control signals;
• means responsive to each said passed signal for generating a jump pulse;
• and
• means for applying each said jump pulse to said tracking servo means, wherein said tracking servo means is responsive to each said jump pulse for incrementally jumping said reading beam backwards to impinge upon the immediately preceding adjacent information track, to thereby effectuate the stop-motion mode.

An apparatus for recovering recorded information from a plurality of spiralling and substantially circular recorded video information tracks or concentric circular recorded video information tracks formed in a record disc, wherein each of the tracks includes at least two fields of information, and for reproducing a selected portion of the recorded information in a field stepwise fashion, comprising:

• means for rotating the disc;
• information recovery means for recovering said fields of recorded information from the information tracks;
• means for moving the disc and said information recovery means radially relative to each other to recover successive ones of said fields of information;
• means for reproducing said recovered fields of information;
• means for generating a stop-motion enable signal, to thereby initiate the stop-motion mode;
• means for repeatedly reproducing the next two fields of information recovered subsequent to initiation of the stop-motion mode, said next two fields being defined as fields C and D, said fields C and D comprising a first information track;
• means for generating a field-step-enable signal;
• means for incrementally jumping said information recovery means, in response to said field-step-enable signal, to a second information track containing two fields D and E of information, wherein said first information track and said second information track contain the same field D;
• and
• means for repeatedly reproducing said two fields D and E.

An apparatus for recovering recorded information from a plurality of spiralling and substantially circular recorded video information tracks or concentric circular recorded video information tracks formed in a record disc, wherein each of the tracks includes at least two fields of information, and for reproducing a selected portion of the recorded information in a field stepwise fashion, comprising;

• means for rotating the disc;
• information recovery means for recovering said fields of recorded information from the information tracks;
• means for moving the disc and said information recovery means radially relative to each other, to recover successive ones of said fields of information;
• means for reproducing said recovered fields of information;
• means for generating a stop-motion enable signal, to thereby initiate the stop-motion mode;
• means for repeatedly reproducing the next two fields of information recovered subsequent to initiation of the stop-motion mode, said next two fields being defined as fields C and D, said fields C and D comprising a first information track;
• means for generating a field-step-enable signal;
• means for incrmentally jumping said information recovery means, in response to said field-step-enable signal, to a second information track containing two fields B and C of information, wherein said first and said second information tracks contain the same field C;
• and
• means for repeatedly reproducing said two fields B and C.