JPS5568782A - Video cipher process system - Google Patents

Video cipher process system

Info

Publication number
JPS5568782A
JPS5568782A JP14268878A JP14268878A JPS5568782A JP S5568782 A JPS5568782 A JP S5568782A JP 14268878 A JP14268878 A JP 14268878A JP 14268878 A JP14268878 A JP 14268878A JP S5568782 A JPS5568782 A JP S5568782A
Authority
JP
Japan
Prior art keywords
signal
video signal
decoder
inverted
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
JP14268878A
Other languages
Japanese (ja)
Inventor
Masataka Okada
Hiroshi Osaka
Akihiko Okada
Toshimi Shigumo
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.)
Faurecia Clarion Electronics Co Ltd
Original Assignee
Clarion 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 Clarion Co Ltd filed Critical Clarion Co Ltd
Priority to JP14268878A priority Critical patent/JPS5568782A/en
Publication of JPS5568782A publication Critical patent/JPS5568782A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To secure the process of the video signal with the flicker put out of the vision by carrying out the ciphering through the level inversion of the luminance signal based on the horizontal scanning period and thus fractionating the shift of the luminance level.
CONSTITUTION: At the broadcasting station side, part of the video signal is inverted through the encoder to be transmitted, and the specified subscriber listens the received video signal through restoration via the decoder. In this case, the signal which is selected within each field based on the key code signal and within the horizontal scanning period is inverted at the side of the broadcasting station, and the code signal is transmitted in piling on the TV signal. The transmitted signal is received, the code signal is decoded through the decoder, and the inverted video signal is restored. In such system, the screen flicker caused by the difference among the parts used for the encoder and the decoder is limited to occur with every horizontal scanning period of the liminance level. Thus the flicker is averaged in a field to be put out of the vision.
COPYRIGHT: (C)1980,JPO&Japio
JP14268878A 1978-11-18 1978-11-18 Video cipher process system Pending JPS5568782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14268878A JPS5568782A (en) 1978-11-18 1978-11-18 Video cipher process system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14268878A JPS5568782A (en) 1978-11-18 1978-11-18 Video cipher process system

Publications (1)

Publication Number Publication Date
JPS5568782A true JPS5568782A (en) 1980-05-23

Family

ID=15321207

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14268878A Pending JPS5568782A (en) 1978-11-18 1978-11-18 Video cipher process system

Country Status (1)

Country Link
JP (1) JPS5568782A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162896A (en) * 1981-03-31 1982-10-06 Clarion Co Ltd Toll television system
JPS59210781A (en) * 1983-05-13 1984-11-29 Matsushita Electric Ind Co Ltd television equipment
JPS6027289A (en) * 1983-07-25 1985-02-12 Nec Corp Concealing system of television picture signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4924530A (en) * 1972-06-30 1974-03-05
JPS5073518A (en) * 1973-08-15 1975-06-17

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4924530A (en) * 1972-06-30 1974-03-05
JPS5073518A (en) * 1973-08-15 1975-06-17

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162896A (en) * 1981-03-31 1982-10-06 Clarion Co Ltd Toll television system
JPS59210781A (en) * 1983-05-13 1984-11-29 Matsushita Electric Ind Co Ltd television equipment
JPS6027289A (en) * 1983-07-25 1985-02-12 Nec Corp Concealing system of television picture signal

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