JPS57129589A - Chargeable television system - Google Patents

Chargeable television system

Info

Publication number
JPS57129589A
JPS57129589A JP56015054A JP1505481A JPS57129589A JP S57129589 A JPS57129589 A JP S57129589A JP 56015054 A JP56015054 A JP 56015054A JP 1505481 A JP1505481 A JP 1505481A JP S57129589 A JPS57129589 A JP S57129589A
Authority
JP
Japan
Prior art keywords
signal
video signal
signals
added
types
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
JP56015054A
Other languages
Japanese (ja)
Inventor
Hiroshi Igarashi
Toshio Kishida
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 JP56015054A priority Critical patent/JPS57129589A/en
Publication of JPS57129589A publication Critical patent/JPS57129589A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/171—Systems operating in the amplitude domain of the television signal

Abstract

PURPOSE:To increase the tapping preventing effect, by coding the video signal with two types of sine wave signals. CONSTITUTION:A video signal (a) is coded by two types of sine wave signals (b) and (c) having different frequencies. The signal (b) is set at an n-fold frequency as much as the horizontal synchronizing frequency. In the same way, the signal (c) is set at an m-fold frequency. These signals (b) and (c) are added to the signal (a) to obtain a coded video signal (d). At the receiver side, the signals (b) and (c) plus their adverse phase sine waves are produced and added together. The coded video signal receives the modulation of amplitude by the added signal to decode the video signal. Accordingly various types of codings are possible by combining the sine waves with variation of their frequencies. As a result, the tapping preventing effect is increased.
JP56015054A 1981-02-05 1981-02-05 Chargeable television system Pending JPS57129589A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56015054A JPS57129589A (en) 1981-02-05 1981-02-05 Chargeable television system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56015054A JPS57129589A (en) 1981-02-05 1981-02-05 Chargeable television system

Publications (1)

Publication Number Publication Date
JPS57129589A true JPS57129589A (en) 1982-08-11

Family

ID=11878116

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56015054A Pending JPS57129589A (en) 1981-02-05 1981-02-05 Chargeable television system

Country Status (1)

Country Link
JP (1) JPS57129589A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008514159A (en) * 2004-09-23 2008-05-01 モトローラ・インコーポレイテッド Method and apparatus for encrypting wireless communication in a wireless communication system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS553944A (en) * 1978-06-23 1980-01-12 Daiken Trade & Ind Co Ltd Decoration sheet and manufacturing thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS553944A (en) * 1978-06-23 1980-01-12 Daiken Trade & Ind Co Ltd Decoration sheet and manufacturing thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008514159A (en) * 2004-09-23 2008-05-01 モトローラ・インコーポレイテッド Method and apparatus for encrypting wireless communication in a wireless communication system

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