Data track accessing apparatus

A data-track accessing apparatus comprising:

• conversion means for reproducing a signal from a record carrier which has a plurality of tracks;
• track-deviation detecting means for detecting a variation of a data-reproduction position of said conversion means on said record carrier from a track position;
• transfer means for transferring the data-reproduction position of said conversion means on said record carrier in a direction traversing the tracks on said record carrier;
• binary-coding means for converting an output signal from said track-deviation detecting means into a binary-coded signal;
• signal processing means for performing an operation for removing an external disturbance component from the binary-coded signal of said binary-coding means;
• control means for controlling said transfer means to detect an objective track based selectively on one of an output signal from said signal processing means and the binary-coded signal of said binary coding means;
• and
• position detecting means for detecting when the data-reproduction position of said conversion means on the record carrier is in close proximity to and prior to the objective track based on the output signal from said signal processing means while said control means controls said transfer means to transfer the data-reproduction position of said conversion means towards the objective track based on the output signal from said signal processing means;
• and,
• switch means for causing said control means to control said transfer means based on the binary-coded signal of said binary-coding means to detect the objective track when said position detecting means detects that the data-reproduction position of said conversion means on the record carrier is in close proximity to and prior to the objective track.