KR960012980A - Device for detecting offset of video signal - Google Patents

Device for detecting offset of video signal Download PDF

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Publication number
KR960012980A
KR960012980A KR1019940024766A KR19940024766A KR960012980A KR 960012980 A KR960012980 A KR 960012980A KR 1019940024766 A KR1019940024766 A KR 1019940024766A KR 19940024766 A KR19940024766 A KR 19940024766A KR 960012980 A KR960012980 A KR 960012980A
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KR
South Korea
Prior art keywords
current
radiated
offset
output
signal
Prior art date
Application number
KR1019940024766A
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Korean (ko)
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KR0126778B1 (en
Inventor
현윤종
박현철
최재홍
유덕현
Original Assignee
김광호
삼성전자 주식회사
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Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019940024766A priority Critical patent/KR0126778B1/en
Publication of KR960012980A publication Critical patent/KR960012980A/en
Application granted granted Critical
Publication of KR0126778B1 publication Critical patent/KR0126778B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Amplifiers (AREA)

Abstract

영상신호간의 오프세트(offset)를 검출하는 장치가 개시된다.An apparatus for detecting an offset between video signals is disclosed.

본 발명에 따른 오프세트 검출장치는 비교하고자 하는 두영상신호를 각기 유입하고, 각각의 영상신호에 상응하는 전류신호를 발생하는 제1, 제2전압전류변환부; 전압전류변환부의 출력을 입력하고, 이를 영상신호의 동기신호구간동안에만 출력하는 스위칭부; 스위칭부에서 출력되는 전휴신호를 기준전류측으로 유입하고, 기준전류와 동등한 복사된 전류를 발생하는 제1,제2의 전류미터; 제1, 제2전류미터에서 발생된 제1, 제2의 복사된 전류의 차에의해 제1, 제2의 복사된 전류가 동등하게 되도록 제2의 전류미터의 기준전류를 귀환제어하는 귀환 제어부; 및 제1, 제2전류미터의 기준전류측에 스위칭부에서의 전류가 제공되지 않는 기간동안 제1, 제2전류미터에서 발생된 복사된 전류의 차를 구하고, 이를 입력단자로 유입되는 영상신호의 오프세트에 상응하는 전류치로서 출력하는 출력부를 포함함을 특징으로 한다.The offset detection apparatus according to the present invention includes first and second voltage current converters for respectively introducing two image signals to be compared and generating a current signal corresponding to each image signal; A switching unit which inputs an output of the voltage-current converting unit and outputs it only during a synchronization signal section of the image signal; First and second current meters which input an idle signal output from the switching unit to a reference current side and generate a radiated current equivalent to the reference current; Feedback control unit for feedback-controlling the reference current of the second current meter so that the first and second radiated currents become equal by the difference between the first and second radiated currents generated by the first and second current meters. ; And obtaining a difference between the radiated currents generated in the first and second current meters during a period in which the current at the switching unit is not provided on the reference current side of the first and second current meters, and the image signal flowing into the input terminal. And an output unit for outputting a current value corresponding to an offset of.

Description

영상신호 오프세트 검출장치Video signal offset detection device

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명에 따른 오프세트 검출장치의 바람직한 실시예를 보이는 회로도이다.1 is a circuit diagram showing a preferred embodiment of the offset detection apparatus according to the present invention.

제2도는 제1도의 도시된 장치의 동작을 설명하기위한 파형도이다.FIG. 2 is a waveform diagram for explaining the operation of the device shown in FIG.

제3도는 제1도에 도시된 장치의 동작을 설명하기위한 다른 파형도이다.3 is another waveform diagram for explaining the operation of the apparatus shown in FIG.

Claims (2)

영상신호간의 기준레벨의 차인 오프세트를 검출하는 장치에 있어서, 비교하고자 하는 두 영상신호를 각기 유입하고, 각각의 영상신호에 상응하는 전류신호를 발생하는 제1, 제2전압전류변환수단; 상기 전압전류변환부의 출력을 입력하고, 이를 영상신호의 동기신호구간동안에만 출력하는 스위칭수단; 상기 스위칭부에서 출력되는 전휴신호를 기준전류측으로 유입하고, 상기 기준전류와 동등한 복사된 전류를 발생하는 제1, 제2의 전휴미러; 제1, 제2전류미러에서 발생된 제1 제2의 복사된 전휴의 차에의해 제1, 제2의 복사된 전류가 동등하게 되도록 상기 제2의 전류미러의 기준전류를 귀환제어하는 귀환제어수단; 및 상기 제1, 제2전류미러의 기준전류측에 상기 스위칭부에서의 전류가 제공되지 않는 기간동안 상기 제1, 제2전류미러에서 발생된 복사된 전류의 차를 구하고, 이를 상기 입력단자로 유입되는 영상신호의 오프세트에 상응하는 전류치로서 출력하는 출력수단을 포함하는 영상신호의 오프세트 검출장치An apparatus for detecting an offset, which is a difference of a reference level between video signals, comprising: first and second voltage current converting means for respectively introducing two video signals to be compared and generating a current signal corresponding to each video signal; Switching means for inputting an output of the voltage current converter and outputting the output only during a synchronization signal section of the video signal; First and second all-time mirrors for introducing an idle signal output from the switching unit to a reference current side and generating a radiated current equivalent to the reference current; Feedback control for feedback-controlling the reference current of the second current mirror such that the first and second radiated currents become equal by the difference between the first and second radiated idle times generated in the first and second current mirrors. Way; And obtaining a difference between the radiated currents generated in the first and second current mirrors during a period in which the current in the switching unit is not provided on the reference current side of the first and second current mirrors, and using the input terminals. An apparatus for detecting an offset of a video signal comprising output means for outputting a current value corresponding to an offset of an incoming video signal ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940024766A 1994-09-29 1994-09-29 Offset detector apparatus of image signal KR0126778B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940024766A KR0126778B1 (en) 1994-09-29 1994-09-29 Offset detector apparatus of image signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940024766A KR0126778B1 (en) 1994-09-29 1994-09-29 Offset detector apparatus of image signal

Publications (2)

Publication Number Publication Date
KR960012980A true KR960012980A (en) 1996-04-20
KR0126778B1 KR0126778B1 (en) 1997-12-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940024766A KR0126778B1 (en) 1994-09-29 1994-09-29 Offset detector apparatus of image signal

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KR0126778B1 (en) 1997-12-29

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