US 11,810,581 B2
Multipoint control method, apparatus 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. 17/422,711
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jan. 7, 2020, PCT No. PCT/JP2020/000101
§ 371(c)(1), (2) Date Jul. 13, 2021,
PCT Pub. No. WO2020/149164, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-006306 (JP), filed on Jan. 17, 2019.
Prior Publication US 2022/0084530 A1, Mar. 17, 2022
Int. Cl. G10L 19/008 (2013.01); G10L 19/16 (2013.01); H04M 3/56 (2006.01); H04M 7/00 (2006.01)
CPC G10L 19/008 (2013.01) [G10L 19/173 (2013.01); H04M 3/561 (2013.01); H04M 3/568 (2013.01); H04M 7/006 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A multipoint control method in a multipoint control unit to which two or more first communication network terminal apparatuses and one or more second communication network terminal apparatuses are connected through a communication path, the number of points at which the two or more first communication network terminal apparatuses are located being M (M is an integer of 2 or greater), the number of points at which the one or more second communication network terminal apparatuses are located being N (N is an integer of 1 or greater), the method comprising:
a point selecting step of, for a predetermined time period, selecting, by the multipoint control unit, one point or two points from among M points at which the two or more first communication network terminal apparatuses are located and N points at which the one or more second communication network terminal apparatuses are located, a bit stream input from each first communication network terminal apparatus to the multipoint control unit through the communication path being a bit stream including, as codes representing a sound signal, a monaural code CFMm (m is an integer from 1 to M) obtained by coding a mixed signal of sound signals of two or more channels input to the first communication network terminal apparatus by a first coding scheme and an extension code CFEm including a code representing information corresponding to a difference between the input sound signals of two or more channels, and a bit stream input from each second communication network terminal apparatus to the multipoint control unit through the communication path being a bit stream including, as a code representing a sound signal, a monaural code CMMn (n is an integer from 1 to N) obtained by coding a sound signal of one channel input to the second communication network terminal apparatus by the first coding scheme; and
a bit stream generating step of, when two first communication network terminal apparatuses of two points of an M1-th point and an M2-th point (M1 is an integer from 1 to M, and M2 is an integer from 1 to M and different from M1) are selected from the two or more first communication network terminal apparatuses and the one or more second communication network terminal apparatuses, generating and outputting, by the multipoint control unit, as a bit stream for an unselected first communication network terminal apparatus of the two or more first communication network terminal apparatuses that is located at a point that is not selected in the point selecting step, a bit stream including, as codes representing a sound signal, a monaural code CFMM1 of codes representing a sound signal of the M1-th point and a monaural code CFMM2 of codes representing a sound signal of the M2-th point.