JPS57162896A - Toll television system - Google Patents
Toll television systemInfo
- Publication number
- JPS57162896A JPS57162896A JP56047894A JP4789481A JPS57162896A JP S57162896 A JPS57162896 A JP S57162896A JP 56047894 A JP56047894 A JP 56047894A JP 4789481 A JP4789481 A JP 4789481A JP S57162896 A JPS57162896 A JP S57162896A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- given
- blanking period
- horizontal
- 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
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
- H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To increase the secrecy as a toll television system, by the encryption so that a horizontal synchronizing signal and a pedestal level in a horizontal blanking period in a video signal can be changed. CONSTITUTION:A encripted television signal is down-converted at a tuner circuit 6 and given to an RF amplifying circuit 7. Since the received television signal is encripted by changing a horizontal synchronizing signal and a pedestal level in a horizontal blanking period, the encripted video signal is demodulated at an RF video processor circuit 14 and given to an information decoder circuit 9. An audio signal is given to an audio signal processing circuit 10 to pick up a superimposed pilot signal and given to a PLL circuit 11, and a horizontal driving pulse signal is given to the information decoder circuit 9 and a horizontal blanking period reproducing processing signal generating circuit 13. The circuit 13 generates a horizontal blanking period reproduction processing signal and gives it to an RF video processor circuit 14.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56047894A JPS57162896A (en) | 1981-03-31 | 1981-03-31 | Toll television system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56047894A JPS57162896A (en) | 1981-03-31 | 1981-03-31 | Toll television system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57162896A true JPS57162896A (en) | 1982-10-06 |
Family
ID=12788104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56047894A Pending JPS57162896A (en) | 1981-03-31 | 1981-03-31 | Toll television system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57162896A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999044365A1 (en) * | 1998-02-26 | 1999-09-02 | Macrovision Corporation | A method and apparatus for enhancing the scrambling of a tv signal via erroneous clamp signals |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50129111A (en) * | 1974-03-27 | 1975-10-13 | ||
JPS5568782A (en) * | 1978-11-18 | 1980-05-23 | Clarion Co Ltd | Video cipher process system |
-
1981
- 1981-03-31 JP JP56047894A patent/JPS57162896A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50129111A (en) * | 1974-03-27 | 1975-10-13 | ||
JPS5568782A (en) * | 1978-11-18 | 1980-05-23 | Clarion Co Ltd | Video cipher process system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999044365A1 (en) * | 1998-02-26 | 1999-09-02 | Macrovision Corporation | A method and apparatus for enhancing the scrambling of a tv signal via erroneous clamp signals |
US6459795B1 (en) | 1998-02-26 | 2002-10-01 | Macrovision Corporation | Method and apparatus for enhancing the scrambling of a TV signal via erroneous clamp signals |
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