JPS5539442A - Adjacent channel stealthy glance preventing device for catv system - Google Patents

Adjacent channel stealthy glance preventing device for catv system

Info

Publication number
JPS5539442A
JPS5539442A JP11283478A JP11283478A JPS5539442A JP S5539442 A JPS5539442 A JP S5539442A JP 11283478 A JP11283478 A JP 11283478A JP 11283478 A JP11283478 A JP 11283478A JP S5539442 A JPS5539442 A JP S5539442A
Authority
JP
Japan
Prior art keywords
signal
signals
circuit
stealthy
glance
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
JP11283478A
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 JP11283478A priority Critical patent/JPS5539442A/en
Publication of JPS5539442A publication Critical patent/JPS5539442A/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 sent to input signal terminal 1 from the CATV broadcast station 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 output is extracted for its aural signal through aural signal branching circuit 4. The data communication signals are amplified at amplifier circuit 5 to be divided through branching circuit 6 into signal process output 12 and the stealthy glance preventing output. The stealthy glance signals are applied to mixer 9, and the other input of mixer 9 receives the aural signal branched through branching circuit 8. The difference signal between the data communication signal and the aural signal is delivered at mixer 9, and this difference signal is very close to the adjacent channels to be used as the stealthy glance preventing signal, which is added at adder circuit 11 after passing through filter 10 to be delivered.
COPYRIGHT: (C)1980,JPO&Japio
JP11283478A 1978-09-13 1978-09-13 Adjacent channel stealthy glance preventing device for catv system Pending JPS5539442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11283478A JPS5539442A (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
JP11283478A JPS5539442A (en) 1978-09-13 1978-09-13 Adjacent channel stealthy glance preventing device for catv system

Publications (1)

Publication Number Publication Date
JPS5539442A true JPS5539442A (en) 1980-03-19

Family

ID=14596690

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11283478A Pending JPS5539442A (en) 1978-09-13 1978-09-13 Adjacent channel stealthy glance preventing device for catv system

Country Status (1)

Country Link
JP (1) JPS5539442A (en)

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