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JPS5621434A - Sessional monitor signal transmission system - Google Patents

Sessional monitor signal transmission system

Info

Publication number
JPS5621434A
JPS5621434A JP9760179A JP9760179A JPS5621434A JP S5621434 A JPS5621434 A JP S5621434A JP 9760179 A JP9760179 A JP 9760179A JP 9760179 A JP9760179 A JP 9760179A JP S5621434 A JPS5621434 A JP S5621434A
Authority
JP
Japan
Prior art keywords
signal
circuit
pcm
monitor signal
sessional
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
JP9760179A
Other languages
Japanese (ja)
Inventor
Takashi Kihara
Akira Miyata
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9760179A priority Critical patent/JPS5621434A/en
Publication of JPS5621434A publication Critical patent/JPS5621434A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To prevent almost the influence upon the noise characteristic of a transmission circuit itself for making PCM signals, by making first the order monitor signal into PCM signal CONSTITUTION:In the transmission part, when the order monitor signal such as a sound signal is input to A/D converting circuit 1, this signal is made into a PCM signal, and this PCM signal is subjected to FM modulation by voltage control oscillating circuit VCO2. The main signal input is superposed to the FM-modulated signal by driving circuit 3, and the obtained signal is converted to a photosignal by light emitting element 4. In the receiving part, the transmitted light signal is received by photodetector 5 and has the FM part cut by low-pass filter 7 after amplified by amplifying circuit 6 and is caused to pass through reproducing circuit 8, thereby obtaining a main signal. The subcarrier is separated by narrowband filter 9 and is subjected to phase detection by phase synchronizing circuit 10 and phase detecting circuit 11. Then, after discrimination of ''1'' and ''0'' for the output, an sessional monitor signal is obtained by D/A conversion.
JP9760179A 1979-07-31 1979-07-31 Sessional monitor signal transmission system Pending JPS5621434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9760179A JPS5621434A (en) 1979-07-31 1979-07-31 Sessional monitor signal transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9760179A JPS5621434A (en) 1979-07-31 1979-07-31 Sessional monitor signal transmission system

Publications (1)

Publication Number Publication Date
JPS5621434A true JPS5621434A (en) 1981-02-27

Family

ID=14196745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9760179A Pending JPS5621434A (en) 1979-07-31 1979-07-31 Sessional monitor signal transmission system

Country Status (1)

Country Link
JP (1) JPS5621434A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075295A2 (en) * 1981-09-21 1983-03-30 Siemens Aktiengesellschaft Optical transmission system for high-frequency digital signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075295A2 (en) * 1981-09-21 1983-03-30 Siemens Aktiengesellschaft Optical transmission system for high-frequency digital signals

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