JPS54157032A - Automatic gain control unit in television receiver - Google Patents
Automatic gain control unit in television receiverInfo
- Publication number
- JPS54157032A JPS54157032A JP6607778A JP6607778A JPS54157032A JP S54157032 A JPS54157032 A JP S54157032A JP 6607778 A JP6607778 A JP 6607778A JP 6607778 A JP6607778 A JP 6607778A JP S54157032 A JPS54157032 A JP S54157032A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- agc
- noise
- gain control
- time constant
- 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
Links
Landscapes
- Picture Signal Circuits (AREA)
- Television Receiver Circuits (AREA)
Abstract
PURPOSE: To prevent the synchronization disturbance dependent upon external pulse noise and the picture quality deterioration of videos by taking out a voltage for gain control from the time constant circuit of an AGC.
CONSTITUTION: In case that pulse noise is superposed onto video signals, noise is detected by noise detection circuit 20 for AGC circuit, and control circuit 18 is cut off by this detection output, and the output of AGC control voltage detection circuit 17 is broken. Consequently, the AGC control voltage which controls video IF amplification and gain control circuit 11 is determined by the time constant of AGC time constant circuit 19. Then, when noise eliminated, circuit 18 is operated, and the AGC function is operated by the output of circuit 17, and the AGC control voltage according to the level of video signals is held in circuit 19, thus making a prescribed operation possible.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6607778A JPS54157032A (en) | 1978-06-01 | 1978-06-01 | Automatic gain control unit in television receiver |
US06/042,345 US4292598A (en) | 1978-06-01 | 1979-05-25 | Automatic gain control circuit |
DE2921777A DE2921777C2 (en) | 1978-06-01 | 1979-05-29 | Automatic gain control circuit |
GB7918917A GB2026269B (en) | 1978-06-01 | 1979-05-31 | Automatic gain control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6607778A JPS54157032A (en) | 1978-06-01 | 1978-06-01 | Automatic gain control unit in television receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54157032A true JPS54157032A (en) | 1979-12-11 |
JPS6160628B2 JPS6160628B2 (en) | 1986-12-22 |
Family
ID=13305415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6607778A Granted JPS54157032A (en) | 1978-06-01 | 1978-06-01 | Automatic gain control unit in television receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54157032A (en) |
-
1978
- 1978-06-01 JP JP6607778A patent/JPS54157032A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6160628B2 (en) | 1986-12-22 |
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