Disc reproducing apparatus for determining a track jump

A method of reproducing a disc in a disc reproducing apparatus adapted to scan information tracks to read information recorded in an information-recording medium, comprising the steps of:

• a) storing present reproducing positional information in a first register;
• b) loading a predetermined value in a second register;
• c) loading reference reproducing positional information in a third register;
• d) determining an occurrence of a track jump when a difference between said present reproducing positional information in said first register and said reference reproducing positional information in said third register is greater than said predetermined value in said second register;
• e) detecting a present information track position;
• and
• f) setting said predetermined value in accordance with the present information track position detected.