	US 12,081,770 B2
	Data encoding and decoding
Karl James Sharman, Basingstoke (GB); Stephen Mark Keating, Basingstoke (GB); and Adrian Richard Browne, Basingstoke (GB)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Appl. No. 18/008,992
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Jun. 16, 2021, PCT No. PCT/GB2021/051507 § 371(c)(1), (2) Date Dec. 8, 2022, PCT Pub. No. WO2021/255443, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 2009255 (GB), filed on Jun. 17, 2020; application No. 2015486 (GB), filed on Sep. 30, 2020; and application No. 2018387 (GB), filed on Nov. 23, 2020.
Prior Publication US 2023/0276056 A1, Aug. 31, 2023
Int. Cl. H04N 19/146 (2014.01); H04N 19/103 (2014.01); H04N 19/12 (2014.01); H04N 19/13 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01)

CPC H04N 19/146 (2014.11) [H04N 19/103 (2014.11); H04N 19/13 (2014.11); H04N 19/12 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11)]

19 Claims

1. A method of decoding an input data signal representing successive data items, the method comprising:

storing history data for decoded data items, the history data indicating one or more aspects of decoding the decoded data items;

decoding a given data item by a first decoding technique, the first decoding technique comprising decoding a series of zero or more data sets, each data set representing a respective range of values of the data items and selecting the series of data sets from a plurality of candidate data sets in dependence upon (i) a number of previously decoded data sets; and (ii) the history data applicable to a given property of the given data item; and

decoding, by circuitry, any remaining value of the given data item, the remaining value being an amount by which the given data item exceeds a maximum value which can be decoded by the first decoding technique, by a second decoding technique different to the first decoding technique.