JPS57168586A - Data processing circuit of charged television broadcast - Google Patents
Data processing circuit of charged television broadcastInfo
- Publication number
- JPS57168586A JPS57168586A JP56034117A JP3411781A JPS57168586A JP S57168586 A JPS57168586 A JP S57168586A JP 56034117 A JP56034117 A JP 56034117A JP 3411781 A JP3411781 A JP 3411781A JP S57168586 A JPS57168586 A JP S57168586A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- signal
- circuit
- data
- delivers
- 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.)
- Granted
Links
Abstract
PURPOSE: To assuredly receive the TV broadcast which is scrambled to prevent the unfair receiving of the broadcast, by obtaining a good discrambling circuit with use of a horizontal synchronizing trigger pulse and a data-use trigger pulse.
CONSTITUTION: A mono-multi 10 is operated by the rise of the horizontal synchronizing and data-use trigger pulses (e) and (f) respectively to produce a signal (h) which is set at a pulse duration same as the normal horizontal synchronizing signal. This signal (h) is supplied to a mono-multi 11 as well as to a clock separating circuit 12 and a data separating circuit 13 respectively. The circuit 12 delivers a horizontal synchronizing pulse (k) from which the pulse (f) is removed, and the circuit 13 delivers a data pulse (j) from which the pulse (e) is removed. The pulse (k) is supplied to an adding circut 14. The circut 14 delivers a signal (n) that produces a pulse in a period corresponding to the direct blanking period and at the same time delivers a signal (l) obtained by synthesizing the signal (n) and the pulse (k). The signal (n) is suplied to a comparator 15, and the signal (l) is supplied to a gate circuit 16 respectively. Such data processing circuit 4 works to control a switching attenuator, and then a scrambling circuit works.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56034117A JPS57168586A (en) | 1981-03-10 | 1981-03-10 | Data processing circuit of charged television broadcast |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56034117A JPS57168586A (en) | 1981-03-10 | 1981-03-10 | Data processing circuit of charged television broadcast |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57168586A true JPS57168586A (en) | 1982-10-16 |
JPH0136307B2 JPH0136307B2 (en) | 1989-07-31 |
Family
ID=12405312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56034117A Granted JPS57168586A (en) | 1981-03-10 | 1981-03-10 | Data processing circuit of charged television broadcast |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57168586A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49131521A (en) * | 1973-04-20 | 1974-12-17 | ||
JPS50129111A (en) * | 1974-03-27 | 1975-10-13 | ||
JPS5477514A (en) * | 1977-10-19 | 1979-06-21 | Feature Film Services | Subscriberh*s tv system |
JPS55114088A (en) * | 1979-02-20 | 1980-09-03 | Payview Ltd | Information encoder |
-
1981
- 1981-03-10 JP JP56034117A patent/JPS57168586A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49131521A (en) * | 1973-04-20 | 1974-12-17 | ||
JPS50129111A (en) * | 1974-03-27 | 1975-10-13 | ||
JPS5477514A (en) * | 1977-10-19 | 1979-06-21 | Feature Film Services | Subscriberh*s tv system |
JPS55114088A (en) * | 1979-02-20 | 1980-09-03 | Payview Ltd | Information encoder |
Also Published As
Publication number | Publication date |
---|---|
JPH0136307B2 (en) | 1989-07-31 |
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