Title:
SIGNAL TRANSMITTING SYSTEM AND SIGNAL TRANSMITTING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/020341
Kind Code:
A1
Abstract:
Provided is a signal transmitting system for transmitting an analog signal obtained by superimposing a charging signal on a voice signal from a sending device to a receiving device, wherein the sending device comprises a separation unit that separates the voice signal from the analog signal, an A/D conversion unit that A/D converts the voice signal separated by the separation unit, a detection unit that detects the charging signal from the analog signal, a coding unit that codes the charging signal detected by the detection unit, and a sending unit that sends the voice signal A/D converted by the A/D conversion unit and the charging signal coded by the coding unit to the receiving device, and the receiving device comprises a receiving unit that receives the voice signal and charging signal sent by the sending unit, a D/A conversion unit that D/A converts the voice signal received by the receiving unit, a decoding unit that decodes the charging signal received by the receiving unit, a conversion unit that converts the charging signal decoded by the decoding unit into an analog wave, and a synthesis unit that synthesizes the voice signal D/A converted by the D/A conversion unit and the analog wave.
Inventors:
FURUYA HIROYUKI (JP)
TOKUYASU TOMOHIRO (JP)
FUKUZONO HAYATO (JP)
ONO YU (JP)
TATSUTA TSUTOMU (JP)
NAKAYAMA TOMOHIRO (JP)
TOKUYASU TOMOHIRO (JP)
FUKUZONO HAYATO (JP)
ONO YU (JP)
TATSUTA TSUTOMU (JP)
NAKAYAMA TOMOHIRO (JP)
Application Number:
PCT/JP2020/028690
Publication Date:
February 04, 2021
Filing Date:
July 27, 2020
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04M15/00; H04M17/00; H04W4/24; H04W84/14
Foreign References:
JP2000278452A | 2000-10-06 | |||
JP2001016624A | 2001-01-19 | |||
JPS6148268A | 1986-03-08 | |||
US20070081645A1 | 2007-04-12 |
Attorney, Agent or Firm:
TAKADA, TAKAHASHI & PARTNERS (JP)
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