PARITY INSPECTION MATRIX CREATION METHOD, ENCODING DEVICE AND RECORDING/PLAYBACK DEVICE

摘要

According to an embodiment, in a parity inspection matrix creation method, N column vectors within a mask matrix are all mutually different. A partial matrix of L consecutive rows arbitrarily extracted from the mask matrix contains B1 first correction rows and Bi ith correction rows. Each row weight of the B1 first correction rows is 1. The B1 first correction rows are provided with a total of one or more '1's in each of A1 first correction columns. Each row weight of the Bi ith correction rows is 2 or more. Each of the Bi ith correction rows is provided with a total of one or more '1's in Ai-1 i-1th correction columns. Each of the Bi ith correction rows is provided with a '1' in one of Ai ith correction columns that are contained in a column group that excludes the columns from the first correction column to the i-1th correction column. The Bi ith correction rows are provided with a total of one or more '1's in each of the Ai ith correction columns. The summation from A1 to AI is equal to L.