US 12,002,489 B2
Recording medium, recording apparatus, recording method, reproducing apparatus, and reproduction method
Satoru Higashino, Kanagawa (JP)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Appl. No. 18/033,749
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Dec. 23, 2021, PCT No. PCT/JP2021/047778
§ 371(c)(1), (2) Date Apr. 25, 2023,
PCT Pub. No. WO2022/158237, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 2021-008225 (JP), filed on Jan. 21, 2021.
Prior Publication US 2023/0402061 A1, Dec. 14, 2023
Int. Cl. G11B 20/12 (2006.01); G11B 20/18 (2006.01)
CPC G11B 20/1217 (2013.01) [G11B 20/18 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A recording medium, wherein
the recording medium has recorded thereon
a multilevel code of at least three ML values produced by coding user data into a (d,k)-RLL code of the ML values, and
a particular pattern of the ML values that includes a run of repeated codes which is greater than a maximum run k of the multilevel code, and
patterns of the ML values whose magnitude of a cross-correlation value computed by using an NRZ (Non Return to Zero) code expressing the multilevel code by using the ML values which include 0 as a center value is equal to or lower than a threshold are recorded in adjacent tracks.