KR810001901B1 - Brightness control circuit employing a closed control loop - Google Patents

Brightness control circuit employing a closed control loop

Info

Publication number
KR810001901B1
KR810001901B1 KR7801805A KR780001805A KR810001901B1 KR 810001901 B1 KR810001901 B1 KR 810001901B1 KR 7801805 A KR7801805 A KR 7801805A KR 780001805 A KR780001805 A KR 780001805A KR 810001901 B1 KR810001901 B1 KR 810001901B1
Authority
KR
South Korea
Prior art keywords
sample
cct
hold
brightness
signal
Prior art date
Application number
KR7801805A
Other languages
Korean (ko)
Inventor
W Groenweg
A Juma
L Harwood
Original Assignee
Rca 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 Rca Corp filed Critical Rca Corp
Priority to KR7801805A priority Critical patent/KR810001901B1/en
Application granted granted Critical
Publication of KR810001901B1 publication Critical patent/KR810001901B1/en

Links

Classifications

    • 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

Abstract

The brightness control appts. in a video system employs a sample and hold cct. including a charge storage capacitor. The sample and hold cct. forms a closed control loop with a signal processing channel, and is keyed during blanking intervals to sample the magnitude of a reference voltage and a brightness representative blanking level of the video signal. The sample and hold cct. provides an output control signal indicative of the voltage difference between the reference voltage and the blanking level. The control signal is applied to the signal channel for translating the blanking level in a direction to minimise the voltage difference.
KR7801805A 1978-06-13 1978-06-13 Brightness control circuit employing a closed control loop KR810001901B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR7801805A KR810001901B1 (en) 1978-06-13 1978-06-13 Brightness control circuit employing a closed control loop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR7801805A KR810001901B1 (en) 1978-06-13 1978-06-13 Brightness control circuit employing a closed control loop

Publications (1)

Publication Number Publication Date
KR810001901B1 true KR810001901B1 (en) 1981-11-20

Family

ID=19207920

Family Applications (1)

Application Number Title Priority Date Filing Date
KR7801805A KR810001901B1 (en) 1978-06-13 1978-06-13 Brightness control circuit employing a closed control loop

Country Status (1)

Country Link
KR (1) KR810001901B1 (en)

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