JPS5539441A - Adjacent channel stealthy glance preventing device for catv system - Google Patents

Adjacent channel stealthy glance preventing device for catv system

Info

Publication number
JPS5539441A
JPS5539441A JP11283378A JP11283378A JPS5539441A JP S5539441 A JPS5539441 A JP S5539441A JP 11283378 A JP11283378 A JP 11283378A JP 11283378 A JP11283378 A JP 11283378A JP S5539441 A JPS5539441 A JP S5539441A
Authority
JP
Japan
Prior art keywords
signals
circuit
adjacent channels
stealthy
channel
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
JP11283378A
Other languages
Japanese (ja)
Inventor
Atsushi Fukushima
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP11283378A priority Critical patent/JPS5539441A/en
Publication of JPS5539441A publication Critical patent/JPS5539441A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent the stealthy glance through the adjacent channels by giving positively the disturbance to the adjacent channels.
CONSTITUTION: The signals are sent to input signal terminal 1 from the CATV broadcast station. The input signals are grouped through branching circuit 2 into the data communication signals and the TV channel signals. The TV channel signals are converted into the output channel via frequency conversion circuit 3, and the data communication signals are smplified at amplifier circuit 5 to be delivered to line 9 through branching circuit 6 for the signal process. And the other branched output is applied to divider circuit 7 for prevention of the stealthy glance. The signals divided at circuit 7 are turned to the signals of about 60.625MHz, which are the signals extremely approximate to the adjacent channels to be used as the stealthy preventing signals. These signals, after removal of the side band through filter 8, are mixed with the output channel at adder circuit 4 to be sent to output terminal 10. Thus the adjacent channels cannot produce a high-quality picture image.
COPYRIGHT: (C)1980,JPO&Japio
JP11283378A 1978-09-13 1978-09-13 Adjacent channel stealthy glance preventing device for catv system Pending JPS5539441A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11283378A JPS5539441A (en) 1978-09-13 1978-09-13 Adjacent channel stealthy glance preventing device for catv system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11283378A JPS5539441A (en) 1978-09-13 1978-09-13 Adjacent channel stealthy glance preventing device for catv system

Publications (1)

Publication Number Publication Date
JPS5539441A true JPS5539441A (en) 1980-03-19

Family

ID=14596666

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11283378A Pending JPS5539441A (en) 1978-09-13 1978-09-13 Adjacent channel stealthy glance preventing device for catv system

Country Status (1)

Country Link
JP (1) JPS5539441A (en)

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