Video signal reproducing apparatus for converting a video signal from a first format to a second format

Video signal reproducing apparatus for converting a first video signal recorded with a first field frequency in successive tracks on a recording medium to a second video signal having a second field frequency different from said first field frequency, said apparatus comprising:

• track scanning means for reproducing said first video signal from said recording medium, said scanning means including a rotary head and head displacement means on which said rotary head is mounted, said head displacement means being controlled to move said rotary head in a direction substantially perpendicular to the direction along said tracks;
• means for controlling the speed of said scanning means relative to said recording medium as a function of said second field frequency;
• and
• shifting means for shifting the position of said scanning means in said substantially perpendicular direction in accordance with the difference between said first and second field frequencies, said shifting means including a circuit for generating a serrated wave signal having a frequency corresponding to the difference between said first and second field frequencies, and a circuit for generating a control signal by sampling and holding said serrated wave signal with a sampling signal having a frequency equal to said second field frequency, said control signal controlling said head displacement means to move said rotary head in said direction substantially perpendicular to the direction along said tracks.

Video signal reproducing apparatus for converting a first video signal recorded with a first field frequency in successive tracks on a recording medium to a second video signal having a second field frequency different from said first field frequency, in which said first video signal has a greater number of lines in each field than does said second video signal, said apparatus comprising:

• track scanning means for reproducing said first video signal from said recording medium, said scanning means being movable in a direction substantially perpendicular to the direction along said tracks;
• means for controlling the speed of said scanning means relative to said recording medium as a function of said second field of frequency;
• shifting means for shifting the position of said scanning means in said substantially perpendicular direction in accordance with the difference between said first and second field frequencies;
• and
• means for converting the number of lines contained in each field of said first video signal to a different number of lines required for each field of said second video signal including memory means, said first video signal being written into said memory means and read out therefrom so that a predetermined number of lines in each field of said first video signal are discarded to leave the number of lines per field required in said second video signal.

Video signal reproducing apparatus for converting a first video signal recorded with a first field frequency in successive tracks in a recording medium to a second video signal having a second field frequency different from said first field frequency, with said second video signal further having a greater number of lines in each field than does said first video signal, said apparatus comprising:

• track scanning means for reproducing said first video signal from said recording medium, said scanning means being movable in a direction substantially perpendicular to the direction along said tracks;
• means for controlling the speed of said scanning means relative to said recording medium as a function of said second field frequency;
• shifting means for shifting the position of said scanning means in said substantially perpendicular direction in accordance with the difference between said first and second field frequencies;
• and
• means for converting the number of lines contained in each field of said first video signal to a different number of lines required for each field of said second video signal, said means for converting including memory means, and said first video signal being written into said memory means and read out therefrom so that a predetermined number of lines in each field of said first video signal are repeated to result in the number of lines per field required in said second video signal.