JPS56119540A - Two-wire signal transmission device - Google Patents

Two-wire signal transmission device

Info

Publication number
JPS56119540A
JPS56119540A JP2172180A JP2172180A JPS56119540A JP S56119540 A JPS56119540 A JP S56119540A JP 2172180 A JP2172180 A JP 2172180A JP 2172180 A JP2172180 A JP 2172180A JP S56119540 A JPS56119540 A JP S56119540A
Authority
JP
Japan
Prior art keywords
transmission
signal
receiving
party
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2172180A
Other languages
Japanese (ja)
Inventor
Toshihiko Wakahara
Hiroshi Kodera
Shinichi Koike
Akio Sabato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2172180A priority Critical patent/JPS56119540A/en
Publication of JPS56119540A publication Critical patent/JPS56119540A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals

Abstract

PURPOSE:To make the transmission quality uniform in transmission and receiving without degradation of the transmission efficiency, by modulating the transmission and receiving signal by carrier waves which have the same frequency and are different in phase by 90 deg., in the transmission device of two-wire full-duplex two-way communication. CONSTITUTION:The transmission signal from transmission circuit 1 extracts the pilot signal of the carrier wave from the signal received from the other party side, and the phase is shifted in phase shifter 13 by 90 deg., and the signal is modulated by modulator 4 and is transmitted. Meanwhile, the signal from the other party is demodulated by the carrier wave extracted by pilot extracting circuit 16, and the receiving signal is obtained by receiving circuit 11. In the other party station, the modulation signal is taken out from reference oscillator 18. Thus, since the same band is used as receiving and transmission bands, transmission and receiving are not different in line impedance and loss characteristic, and the transmission quality is made uniform to transmit the signal with the 1/2 band.
JP2172180A 1980-02-25 1980-02-25 Two-wire signal transmission device Pending JPS56119540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2172180A JPS56119540A (en) 1980-02-25 1980-02-25 Two-wire signal transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2172180A JPS56119540A (en) 1980-02-25 1980-02-25 Two-wire signal transmission device

Publications (1)

Publication Number Publication Date
JPS56119540A true JPS56119540A (en) 1981-09-19

Family

ID=12062937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2172180A Pending JPS56119540A (en) 1980-02-25 1980-02-25 Two-wire signal transmission device

Country Status (1)

Country Link
JP (1) JPS56119540A (en)

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