JPS57168586A - Data processing circuit of charged television broadcast - Google Patents

Data processing circuit of charged television broadcast

Info

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
Application number
JP56034117A
Other languages
Japanese (ja)
Other versions
JPH0136307B2 (en
Inventor
Katsumi Hida
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP56034117A priority Critical patent/JPS57168586A/en
Publication of JPS57168586A publication Critical patent/JPS57168586A/en
Publication of JPH0136307B2 publication Critical patent/JPH0136307B2/ja
Granted legal-status Critical Current

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
JP56034117A 1981-03-10 1981-03-10 Data processing circuit of charged television broadcast Granted JPS57168586A (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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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