JPS5563145A - Space transmission type optical repeating installation - Google Patents

Space transmission type optical repeating installation

Info

Publication number
JPS5563145A
JPS5563145A JP13572378A JP13572378A JPS5563145A JP S5563145 A JPS5563145 A JP S5563145A JP 13572378 A JP13572378 A JP 13572378A JP 13572378 A JP13572378 A JP 13572378A JP S5563145 A JPS5563145 A JP S5563145A
Authority
JP
Japan
Prior art keywords
modulation
light
signal
optical system
transmitted
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
JP13572378A
Other languages
Japanese (ja)
Inventor
Satoshi Koyama
Motoyoshi Morifuji
Akira Takahashi
Tatsuo Inaba
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 JP13572378A priority Critical patent/JPS5563145A/en
Publication of JPS5563145A publication Critical patent/JPS5563145A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/026—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse time characteristics modulation, e.g. width, position, interval

Landscapes

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

Abstract

PURPOSE:To reduce the noise over a wide band by modulating the input signal through the modulator circuit comprising the free running multivibrator, giving the luminance modulation to the light emitting diode with the output of the modulator circuit and then transmitting the light through the optical system. CONSTITUTION:The input signal obtained by converting the information signal from TV camera 1 or the TV wave from receiver 2 into the base band of the video received undergoes the pulse duration modulation (PWM) through modulator circuit 3 using the free running multivibrator. With this modulation signal, the luminance modulation is given to light emitting diode 4. The radiation light of diode 4 is changed into the parallel light through optical system 5 including the convex lens, the reflector and others to be then transmitted. This transmitted light is condensed by optical system 6 at a remote place to be converted into the electric signal through optical detector 7 such as the PIN diode, the APD and others. Then the input signal is reproduced at demodulator 8 to be displayed at picture receiver monitor 9. This signal process including the modulation and demodulation can be carried out in a digital way. Thus the deterioration can be reduced through the processes, and furthermore chrominance subcarrier can be transmitted without any disturbance since the carrier frequency is increased.
JP13572378A 1978-11-06 1978-11-06 Space transmission type optical repeating installation Pending JPS5563145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13572378A JPS5563145A (en) 1978-11-06 1978-11-06 Space transmission type optical repeating installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13572378A JPS5563145A (en) 1978-11-06 1978-11-06 Space transmission type optical repeating installation

Publications (1)

Publication Number Publication Date
JPS5563145A true JPS5563145A (en) 1980-05-13

Family

ID=15158366

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13572378A Pending JPS5563145A (en) 1978-11-06 1978-11-06 Space transmission type optical repeating installation

Country Status (1)

Country Link
JP (1) JPS5563145A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258596A (en) * 1966-06-28 Pulse-frequency modulated injection laser
JPS5246472A (en) * 1975-10-08 1977-04-13 Sanyo Electric Co Molded chassis and pulley for radio receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258596A (en) * 1966-06-28 Pulse-frequency modulated injection laser
JPS5246472A (en) * 1975-10-08 1977-04-13 Sanyo Electric Co Molded chassis and pulley for radio receiver

Similar Documents

Publication Publication Date Title
CA1314625C (en) Video communication system and phase or frequency modulator included therein
RU98101821A (en) DEVICE OF MULTIMEDIA INPUT AND MANAGEMENT AND METHOD OF MULTIMEDIA COMMUNICATIONS
FI862138A (en) FREKVENSGENERERING FOER FAERGTELEVISIONSKODNING OCH -AVKODNING MED MULTIPLEXA, ANALOGA KOMPONENTER.
JPS5636290A (en) Recording and reproducing device with image pickup function
US4300166A (en) System for transmitting signals between a television camera and the associated control unit
JPS5563145A (en) Space transmission type optical repeating installation
FR2382141A1 (en) TELEVISION RECEIVER IN WHICH TWO FREQUENCY MODULATED SOUND CARRIERS ARE USED
GB1280049A (en) Television camera system
GB1503691A (en) Colour television system
DK375486D0 (en) IMPROVING SIGNAL / NOISE CONDITIONS USING BASIC BAND SIGNALS IN AN FM REMOTE SIGHT SYSTEM
KR970057698A (en) Method and apparatus for transmitting signals by infrared rays
GB1327470A (en) Television systems
JPS5258417A (en) Signal transmission system for color television
RU2103839C1 (en) Digital color television system
JPS6090483A (en) Optical transmitter/receiver
SU1102054A1 (en) Device for transmitting television picture signal
SU1424141A1 (en) Method of transmitting stereoscopic color television images
SU832730A1 (en) Frequency-modulated signal transmitter
DK0518946T3 (en) Method of transmitting a video signal
JPS5541068A (en) Photo video information system
ATE107113T1 (en) COMPATIBLE FREQUENCY MULTIPLEX TELEVISION SYSTEM.
SU605342A1 (en) Device for shaping colour synchronization in "secam" system decoder
JPS573478A (en) Equalizing circuit for amplitude distortion
JPH09294110A (en) Optical signal transmitter
JPS54150028A (en) Recording and reproducing system for color video information