Recording/reproducing apparatus and method
AssigneeSony Corporation
InventorsShoei Kobayashi, Toru Takeda, Tamotsu Yamagami
Life of this patent
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Abstract
An information recording/reproducing apparatus wherein exact reproduction of both wobbled address information and sync information can be realized in a recording mode as well as in a reproduction mode. The apparatus comprises first and second detectors for detecting two diametrical side portions of each track on a recording medium where a pregroove is modulated correspondingly to address information and sync information of mutually different frequency bands; a calculator for calculating a normalized track information signal on the basis of the outputs of the first and second detectors; and a third detector for detecting the address information and/or the sync signal on the basis of the output of the calculator.
Claims7
An information recording/reproducing apparatus for recording information on and/or reproducing the same from a recording medium where a data recording track is previously formed as a pregroove, said apparatus comprising:
- first and second detector means for detecting two diametrical side portions of the track on said recording medium where said pregroove is modulated in accordance with address information and sync information of mutually different frequency bands, the sync information inserted at a zero crossing point of a carrier which is frequency modulated by the address information;
- a calculator means for calculating a normalized track information signal on the basis of the outputs of said first and second detector means;
- and
- a third detector means for detecting said address information and/or said sync signal on the basis of the output of said calculator means.
An information recording/reproducing method for recording information on and/or reproducing the same from a recording medium where a data recording track is previously formed as a pregroove, said method comprising the steps of:
- detecting two diametrical side portions of the track on said recording medium where said pregroove is modulated in accordance with address information and sync information of mutually different frequency bands, the sync information inserted at a time-axis zero crossing point of a carrier which is frequency modulated by the address information;
- calculating a normalized track information signal on the basis of the detection outputs;
- and
- detecting said address information and/or said sync signal on the basis of result of said calculation.
An information recording/reproducing apparatus for recording information on and/or reproducing the same from a recording medium where a data recording track is previously formed as a pregroove, said apparatus comprising:
- first and second detectors for detecting two diametrical side portions of the track on said recording medium where said pregroove is modulated in accordance with address information and sync information of mutually different frequency bands, the sync information inserted at a zero crossing point of a carrier which is frequency modulated by the address information, wherein the zero crossing point is at a data bit switching point;
- a calculator for calculating a normalized track information signal on the basis of the outputs of said first and second detector;
- and
- a third detector for detecting said address information and/or said sync signal on the basis of the output of said calculator.
Dependencies are inferred from the claim text.