JPS5555634A - Frequency characteristic compensation method in coaxial cable transmission - Google Patents

Frequency characteristic compensation method in coaxial cable transmission

Info

Publication number
JPS5555634A
JPS5555634A JP12832978A JP12832978A JPS5555634A JP S5555634 A JPS5555634 A JP S5555634A JP 12832978 A JP12832978 A JP 12832978A JP 12832978 A JP12832978 A JP 12832978A JP S5555634 A JPS5555634 A JP S5555634A
Authority
JP
Japan
Prior art keywords
signal
deterioration
level
cable
coaxial cable
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
JP12832978A
Other languages
Japanese (ja)
Other versions
JPS6057790B2 (en
Inventor
Natsuki Nakamura
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP53128329A priority Critical patent/JPS6057790B2/en
Publication of JPS5555634A publication Critical patent/JPS5555634A/en
Publication of JPS6057790B2 publication Critical patent/JPS6057790B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

PURPOSE: To compensate the deterioration in the frequency characteristics by transmission, by detecting the degree of deterioration of color composite video signal transmitted on the coaxial cable as electric amount and connecting the cable compensator corresponding to the deterioration.
CONSTITUTION: The pedestal level of VBS (color composite video signal) signal is clamped at DC0V with the detector 12, and the tip of synchronizing signal is sampled and picked up to obtain the level A of synchronizing signal. The color burst signal is picked up with the detector 13, and the tip of envelope is sampled with detection to obtain the level B of the color burst signal B. The level difference on cable length is differentially amplified 14 and A/D conversion 15 is made. If there is any deterioration of cable, the level difference signal is greater. The level difference signal and the reference voltage and compared 21∼24 to operate the logic circuits 25∼31. As a result, the analog switch 9 is selectively operated 16 and VBS signal selectively in loss compensations 5∼8, is amplified and outputted 10.
COPYRIGHT: (C)1980,JPO&Japio
JP53128329A 1978-10-20 1978-10-20 Frequency characteristic compensation method in coaxial cable transmission Expired JPS6057790B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53128329A JPS6057790B2 (en) 1978-10-20 1978-10-20 Frequency characteristic compensation method in coaxial cable transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53128329A JPS6057790B2 (en) 1978-10-20 1978-10-20 Frequency characteristic compensation method in coaxial cable transmission

Publications (2)

Publication Number Publication Date
JPS5555634A true JPS5555634A (en) 1980-04-23
JPS6057790B2 JPS6057790B2 (en) 1985-12-17

Family

ID=14982086

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53128329A Expired JPS6057790B2 (en) 1978-10-20 1978-10-20 Frequency characteristic compensation method in coaxial cable transmission

Country Status (1)

Country Link
JP (1) JPS6057790B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57196684A (en) * 1981-05-28 1982-12-02 Sony Corp Frequency characteristic correcting device for transmission video signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798900A (en) * 1951-02-02 1957-07-09 Philco Corp Gain control system for color television receiver
JPS4826020A (en) * 1971-08-05 1973-04-05

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798900A (en) * 1951-02-02 1957-07-09 Philco Corp Gain control system for color television receiver
JPS4826020A (en) * 1971-08-05 1973-04-05

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57196684A (en) * 1981-05-28 1982-12-02 Sony Corp Frequency characteristic correcting device for transmission video signal
JPH033995B2 (en) * 1981-05-28 1991-01-21 Sony Corp

Also Published As

Publication number Publication date
JPS6057790B2 (en) 1985-12-17

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