[go: up one dir, main page]

JPS5520084A - Carrier current supply system - Google Patents

Carrier current supply system

Info

Publication number
JPS5520084A
JPS5520084A JP9424378A JP9424378A JPS5520084A JP S5520084 A JPS5520084 A JP S5520084A JP 9424378 A JP9424378 A JP 9424378A JP 9424378 A JP9424378 A JP 9424378A JP S5520084 A JPS5520084 A JP S5520084A
Authority
JP
Japan
Prior art keywords
carrier
carrier current
circuit part
end office
current
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
JP9424378A
Other languages
Japanese (ja)
Inventor
Isao Sakuyama
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP9424378A priority Critical patent/JPS5520084A/en
Publication of JPS5520084A publication Critical patent/JPS5520084A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To obtain a miniaturized carrier end office device with no carrier current generation part required by providing carrier current generation part only at one area and supplying the necessary carrier current to other stations via different wires. CONSTITUTION:The aural signal of carrier end office unit 20 enters modulator circuit part 3 to be modulated by the carrier current sent from the carrier generation/supply circuit part 4, and is then transmitted carrier end office device 21 via transmission amplifier part 1. While the carrier current of part 4 is transmitted to device 21 through transmission line 32. This current is compensated by carrier current amplification/supply circuit part 9 to be used for demodulation of the moltiplied signal entered circuit part 8, and also supplied to modulator circuit part 10 to be used for the carrier current of the multiplied signal which is transmitted to device 20 from 21. In such way, the carrier current of one end office device is used in common to omit the carrier current generation parts of other stations, thus realizing miniaturization of the end office device which requires no circuit part 4.
JP9424378A 1978-08-01 1978-08-01 Carrier current supply system Pending JPS5520084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9424378A JPS5520084A (en) 1978-08-01 1978-08-01 Carrier current supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9424378A JPS5520084A (en) 1978-08-01 1978-08-01 Carrier current supply system

Publications (1)

Publication Number Publication Date
JPS5520084A true JPS5520084A (en) 1980-02-13

Family

ID=14104858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9424378A Pending JPS5520084A (en) 1978-08-01 1978-08-01 Carrier current supply system

Country Status (1)

Country Link
JP (1) JPS5520084A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4502098A (en) * 1981-02-10 1985-02-26 Brown David F Circuit assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4502098A (en) * 1981-02-10 1985-02-26 Brown David F Circuit assembly

Similar Documents

Publication Publication Date Title
JPS5520084A (en) Carrier current supply system
ES8202210A1 (en) Voltage and temperature stabilized constant current source circuit
JPS526550A (en) 2-wire type conversion amplifier
JPS5373852A (en) Apparatus for connecting circuit parts for air conditioninc system
ES8601609A1 (en) Improvements in telephone instruments.
JPS55127778A (en) Terminal control unit of catv system
JPS5417623A (en) Scanning-speed modulator circuit
MY104835A (en) Color display system
JPS56161750A (en) Synchronizing system in telephone set
GB2012521A (en) Feed bridge for a telephone line
JPS5552654A (en) Signal transmission system
JPS5323202A (en) Scan system
JPS538509A (en) Impedance matching system for data transmission circuit
JPS52143472A (en) Constant current supply system
JPS51113402A (en) Receiving amplification circuit for telephone
JPS5534586A (en) Trouble detecting system in two-ways data communication system
JPS57172515A (en) Pedestal clamping circuit
JPS5696570A (en) Transmission circuit for audible signal
JPS55107286A (en) Semiconductor laser modulation device
JPS53148214A (en) Power supply system of channel converter
JPS5266176A (en) Communication apparatus for unmanned vehicle
JPS5346241A (en) Impedance matching unit
JPS52135619A (en) Input unit
JPS574669A (en) Superimposing system between superimposed signal and picture control signal
JPS53131707A (en) Auotmatic telephone exchange system