JPS5527718A - Transmission system for color television signal - Google Patents

Transmission system for color television signal

Info

Publication number
JPS5527718A
JPS5527718A JP10048978A JP10048978A JPS5527718A JP S5527718 A JPS5527718 A JP S5527718A JP 10048978 A JP10048978 A JP 10048978A JP 10048978 A JP10048978 A JP 10048978A JP S5527718 A JPS5527718 A JP S5527718A
Authority
JP
Japan
Prior art keywords
signal
synchronous
color
reference level
terminal
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
JP10048978A
Other languages
Japanese (ja)
Inventor
Minoru Shimoda
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP10048978A priority Critical patent/JPS5527718A/en
Publication of JPS5527718A publication Critical patent/JPS5527718A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To ensure the transmission of the DC reference level with no effect of the frequency characteristics and the level fluctuation of the transmission line by transmitting the front porch of the video signal in the form of the DC reference level of the compressed color signal.
CONSTITUTION: The color signal supplied to terminal 1 is turned to the time axis compressed color signal through time axis compression circuit 3. The part of the blanking period of the color signal is clamped by clamper 5, and this period is defined as the earth potential. While the luminance signal supplied to terminal 2 is clamped by clamper 6 for the tip or the back porch of the synchronous signal, and the DC reference level of the multiplied color signal is set so as to be the earth potential from the bottom of the synchronous signal. At the same time, the synchronous isolation is given to the luminance signal through synchronous isolation circuit 8, and the horizontal and vertical synchronous signals are extracted. Then the control signal is produced through control signal generator 9. Switch 7 is connected to the color signal while the control signal features a high level and then to the luminance signal during a low level respectively. As a result, the signal obtained by setting the front porch period of the video signal to the DC reference level of the color compression signal is delivered to terminal 10.
COPYRIGHT: (C)1980,JPO&Japio
JP10048978A 1978-08-18 1978-08-18 Transmission system for color television signal Pending JPS5527718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10048978A JPS5527718A (en) 1978-08-18 1978-08-18 Transmission system for color television signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10048978A JPS5527718A (en) 1978-08-18 1978-08-18 Transmission system for color television signal

Publications (1)

Publication Number Publication Date
JPS5527718A true JPS5527718A (en) 1980-02-28

Family

ID=14275336

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10048978A Pending JPS5527718A (en) 1978-08-18 1978-08-18 Transmission system for color television signal

Country Status (1)

Country Link
JP (1) JPS5527718A (en)

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