Information signal reproducing apparatus with track pitch discriminating function

An information signal reproducing apparatus for reproducing information signals from a record bearing medium on which said information signals are recorded in many recording tracks spaced at either a first or a second track pitch with four different pilot signals of four different frequencies recorded in rotation, along with said information signals, one in each of said recording tracks, comprising:

• (a) head means for reproducing said information signals by tracing said record bearing medium;
• (b) moving means for moving said record bearing medium in a direction crossing said recording tracks;
• (c) tracking control means for controlling the position of said head means and that of said record bearing medium relative to each other by using said four different pilot signals included in the signal reproduced by said head means;
• (d) detecting means for producing two detection signals, levels of said two detection signals respectively indicating levels of two of said four different pilot signals being recorded in two recording tracks;
• (e) a pair of comparison means for respectively comparing said two detection signals with a reference level, said pair of comparison means being arranged to set said reference level at a first predetermined level when said record bearing medium is moved at a first moving speed by said moving means, and to set said reference level at a second predetermined level, which is lower than said first predetermined level, when said record bearing medium is moved at a second moving speed by said moving means;
• and
• (f) change-over means for effecting change-over of the medium moving speed of said moving means, on the basis of the outputs of said pair of comparison means, between said first moving speed, which corresponds to said first track pitch, and said second moving speed which corresponds to said second track pitch.

An information signal reproducing apparatus for reproducing information signals from a record bearing medium having many recording tracks which are formed with said information signals on said medium and are spaced at a track pitch selected from a plurality of different track pitch values, comprising:

• (a) head means for reproducing said information signals by tracing said record bearing medium;
• (b) tracking control means for controlling the position of said head means and that of said medium relative to each other by using signals reproduced by said head means;
• (c) detecting means which produces two detection signals, levels of said two detection signals respectively indicating levels of signals reproduced by said head means from two recording tracks;
• (d) a pair of comparison means for respectively comparing said two detection signals with either a first reference level or a second reference level;
• and
• (e) discriminating means for discriminating said track pitch on the basis of outputs of said pair of comparison means, said pair of comparison means being arranged to change the refernece level compared with said two detection signals between said first reference level and said second reference level on the basis of an output of said discriminating means.

An information signal reproducing apparatus for reproducing information signals from a record bearing medium on which said information signals are recorded in many recording tracks spaced at a track pitch selected from a plurality of different track pitch values with different pilot signals of four different frequencies recorded in rotation, along with said information signals, one in each of said recording tracks, comprising:

• (a) head means for reproducing said information signals by tracing said record bearing medium;
• (b) detecting means for producing two detection signals indicative of the levels of two of said four different pilot signals included in the signal reproduced by said head means;
• (c) a pair of comparison means for respectively comparing said two detection signals with either a first reference level or a second reference level;
• and
• (d) discriminating means for discriminating said track pitch on the basis of outputs of said pair of comparison means, said pair of comparison means being arranged to change the reference level compared with said two detection signals between said first reference level and said second reference level on the basis of an output of said discriminating means.