Rotary recording medium reproducing apparatus with a tracking control defeating circuit for rapid track access

Claim 1

A reproducing apparatus for reproducing a rotary recording medium in which one and the other of first and second reference signals are alternately recorded on every track turn, the reference signals being recorded between each track turn of a main information signal track, said rotary recording medium having a third reference signal recorded thereon at positions corresponding to the positions where the recording of said first and second reference signals are alternately changed over every said track turn, said reproducing apparatus comprising: reproducing transducer means having a reproducing element for reproducing said main information signal and the first and second reference signals at both sides of said main information signal track, said reproducing transducer having means for controlling the tracking of said reproducing element; separation circuit means for respectively separating said first and second reference signals from a signal reproduced by said reproducing transducer means; wave detection circuit means for respectively wave-detecting said separated reference signals; time constant circuit means for eliminating an unwanted component in an output signal of said wave detection circuit means and for holding a required signal; tracking control signal applying circuit means for obtaining a tracking control signal from an output signal of said time constant circuit means and for applying the tracking control signal to the tracking control means of said reproducing transducer; interrupting circuit means at a stage before said time constant circuit means, for interrupting the transmission of said reproduced reference signals during a mode in which a tracking control operation is not performed; circuit means for separating the third reference signal from the signal reproduced by said reproducing transducer means; switching signal forming circuit means for forming a switching signal in response to said separated third reference signal; and changeover circuit means responsive to the switching signal supplied from said switching signal forming circuit means, for alternately changing over and supplying said separated first and second reference signals to said detection circuit means, said switching signal forming circuit means putting said changeover circuit means in a signal transmission interrupting state during the mode in which the tracking control operation is not performed.