US 11,837,241 B2
Encoding and decoding method, decoding method, apparatuses therefor and program
Takehiro Moriya, Tokyo (JP); Yutaka Kamamoto, Tokyo (JP); and Ryosuke Sugiura, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/422,692
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jan. 7, 2020, PCT No. PCT/JP2020/000100
§ 371(c)(1), (2) Date Jul. 13, 2021,
PCT Pub. No. WO2020/149163, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-006305 (JP), filed on Jan. 17, 2019.
Prior Publication US 2022/0101862 A1, Mar. 31, 2022
Int. Cl. G10L 19/008 (2013.01); G10L 19/005 (2013.01); H04L 65/80 (2022.01); H04L 65/70 (2022.01)
CPC G10L 19/008 (2013.01) [G10L 19/005 (2013.01); H04L 65/70 (2022.05); H04L 65/80 (2013.01)] 10 Claims
OG exemplary drawing
 
3. A decoding method for a terminal apparatus used for multipoint phone connection, the method comprising a decoding step of,
for a time period in which an input code representing a sound signal is a pair of a monaural code and an extension code corresponding to a sound signal of one point, obtaining a provisional decoded sound signal by decoding the monaural code included in the input code representing a sound signal which is the pair by a first decoding scheme, obtaining decoded difference information from the extension code included in the input code representing a sound signal which is the pair, and obtaining C decoded sound signals (C is an integer of 2 or greater) from the provisional decoded sound signal and the decoded difference information by regarding the provisional decoded sound signal as a mixed signal of the C decoded sound signals and regarding the decoded difference information as information corresponding to a difference between the C decoded sound signals, and outputting the C decoded sound signals,
for a time period in which an input code representing a sound signal is one monaural code corresponding to a sound signal of one point, obtaining one decoded sound signal by decoding the one monaural code by the first decoding scheme and outputting the one decoded sound signal, and
for a time period in which an input code representing a sound signal is k monaural codes corresponding to sound signals of k points (k is an integer of 2 or greater), obtaining k decoded sound signals by decoding each of the k monaural codes by the first decoding scheme and outputting the decoded k sound signals.