JPS5513567A - Information transfer unit dependent upon infrared ray - Google Patents

Information transfer unit dependent upon infrared ray

Info

Publication number
JPS5513567A
JPS5513567A JP8615978A JP8615978A JPS5513567A JP S5513567 A JPS5513567 A JP S5513567A JP 8615978 A JP8615978 A JP 8615978A JP 8615978 A JP8615978 A JP 8615978A JP S5513567 A JPS5513567 A JP S5513567A
Authority
JP
Japan
Prior art keywords
signals
circuit
transmission conditions
agc amplifier
deterioration
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
JP8615978A
Other languages
Japanese (ja)
Inventor
Satoshi Koyama
Motoyoshi Morifuji
Akira Takahashi
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.)
Yagi Antenna Co Ltd
Original Assignee
Yagi Antenna 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 Yagi Antenna Co Ltd filed Critical Yagi Antenna Co Ltd
Priority to JP8615978A priority Critical patent/JPS5513567A/en
Publication of JPS5513567A publication Critical patent/JPS5513567A/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
    • H04B10/60—Receivers

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 report the deterioration of transmission conditions by transmitting character signals, which are prepared previously in stead of photo detection pictures, as picture signals. CONSTITUTION:Infrared-ray signals which come through space are converted to electric signals by photo detection element 4 and are amplified by AGC amplifier 5. AGC amplifier 5 sends the output signals to output terminal 10 and sends a part of them to an AGC detector circuit and switching discrimination circuit 8. Now, if transmission conditions are deteriorated considerably and the output voltage level of AGC amplifier 5 is lowered, switching discrimination circuit 8 switches the contact of switch 7 from position A at a normal time to position B at an abnormal time, and simultaneously, circuit 8 operates character generator circuit 6 to connect circuit 6 to the output terminal. Thus, in case that anomaly occurs on the transmission path and pictures cannot be reproduced, character signals prepared previously are transmitted as picture signals, thereby reporting the deterioration of transmission conditions.
JP8615978A 1978-07-17 1978-07-17 Information transfer unit dependent upon infrared ray Pending JPS5513567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8615978A JPS5513567A (en) 1978-07-17 1978-07-17 Information transfer unit dependent upon infrared ray

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8615978A JPS5513567A (en) 1978-07-17 1978-07-17 Information transfer unit dependent upon infrared ray

Publications (1)

Publication Number Publication Date
JPS5513567A true JPS5513567A (en) 1980-01-30

Family

ID=13878952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8615978A Pending JPS5513567A (en) 1978-07-17 1978-07-17 Information transfer unit dependent upon infrared ray

Country Status (1)

Country Link
JP (1) JPS5513567A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6175652U (en) * 1984-10-24 1986-05-21
JP2004172741A (en) * 2002-11-18 2004-06-17 Koito Ind Ltd Transmission fault discriminating apparatus and free-space optical transmission apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4919610A (en) * 1972-06-05 1974-02-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4919610A (en) * 1972-06-05 1974-02-21

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6175652U (en) * 1984-10-24 1986-05-21
JP2004172741A (en) * 2002-11-18 2004-06-17 Koito Ind Ltd Transmission fault discriminating apparatus and free-space optical transmission apparatus

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