公开(公告)号：US11968324B2

公开(公告)日：2024-04-23

申请号：US17629986

申请日：2020-07-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hiroyuki Furuya ,  Tomohiro Tokuyasu ,  Hayato Fukuzono ,  Yu Ono ,  Tsutomu Tatsuta ,  Tomohiro Nakayama

IPC: H04M17/00 ,  H04M15/00 ,  H04M17/02 ,  H04W4/24

CPC classification number: H04M17/023 ,  H04M15/8228 ,  H04W4/24 ,  H04M2017/246

Abstract: In a signal transmission system for transmitting an analog signal, in which a billing signal is superposed on an audio signal, from a transmitting device to a receiving device, the transmitting device includes a separation unit configured to separate the audio signal from the analog signal, an AD conversion unit configured to perform AD conversion on the audio signal separated by the separation unit, a detection unit configured to detect the billing signal from the analog signal, a coding unit configured to encode the billing signal detected by the detection unit, and a transmission unit configured to transmit the audio signal subjected to the AD conversion by the AD conversion unit and the billing signal encoded by the coding unit to the receiving device, and the receiving device includes a reception unit configured to receive the audio signal and the billing signal transmitted by the transmission unit, a DA conversion unit configured to perform DA conversion on the audio signal received by the reception unit, a decoding unit configured to decode the billing signal received by the reception unit, a conversion unit configured to convert the billing signal decoded by the decoding unit into an analog wave, and a combination unit configured to combine the audio signal subjected to the DA conversion by the DA conversion unit and the analog wave.

公开(公告)号：US11838167B2

公开(公告)日：2023-12-05

申请号：US17596064

申请日：2020-05-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hayato Fukuzono ,  Tomohiro Tokuyasu ,  Keita Kuriyama ,  Hiroyuki Furuya ,  Yu Ono ,  Tsutomu Tatsuta ,  Tomohiro Nakayama

IPC: H04L27/36 ,  H04W72/08 ,  H04W28/18 ,  H04W72/54

CPC classification number: H04L27/36 ,  H04W28/18 ,  H04W72/54

Abstract: Provided is a wireless communication system configured to accommodate a plurality of circuits to transmit a signal from a transmitter to a receiver, the system including a number-of-circuits observation unit configured to observe the number of circuits among the plurality of circuits through which communication is being performed; a quality observation unit configured to observe a quality of each of a plurality of communications; a determination unit configured to determine a modulation scheme for transmitting a signal based on the number of circuits observed by the number-of-circuits observation unit, the quality of each of the plurality of communications observed by the quality observation unit, and a required throughput of each of the plurality of circuits; and a modulation unit configured to modulate the signal using the modulation scheme determined by the determination unit.

公开(公告)号：US11979898B2

公开(公告)日：2024-05-07

申请号：US17596160

申请日：2020-05-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomohiro Tokuyasu ,  Hiroyuki Furuya ,  Hayato Fukuzono ,  Yu Ono ,  Tsutomu Tatsuta ,  Tomohiro Nakayama

IPC: H04W72/542 ,  H04W72/23

CPC classification number: H04W72/542 ,  H04W72/23

Abstract: A wireless communication system includes a plurality of sets of base station devices and terminal station devices configured to perform communications in an equal frame length using a time division duplex scheme, the communications of the plurality of sets being simultaneously operated in adjacent areas, in which each of the base station devices includes a control unit configured to control a transmission timing of a downlink signal transmitted from the base station device itself based on a communication distance between the base station device and the terminal station device of each of the sets or a reception timing of a downlink signal in the terminal station device such that reception timings of downlink signals transmitted from the base station device itself and other base station devices in the terminal station devices of the sets fall within a predetermined range determined in advance.