JPS5492126A - Agc voltage detection circuit - Google Patents
Agc voltage detection circuitInfo
- Publication number
- JPS5492126A JPS5492126A JP16047477A JP16047477A JPS5492126A JP S5492126 A JPS5492126 A JP S5492126A JP 16047477 A JP16047477 A JP 16047477A JP 16047477 A JP16047477 A JP 16047477A JP S5492126 A JPS5492126 A JP S5492126A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- synchronizing signal
- input
- level
- signal
- 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
- Television Receiver Circuits (AREA)
Abstract
PURPOSE: To detect the level of synchronizing signal contained in the composite picture signal with a simple construction by applying a synchronizing signal separated from composite picture signal to the base of the first transister through a pulse delay circuit.
CONSTITUTION: When a pulse delayed approximately 2 to 3 μ seconds from the synchronizing signal separated from the detected picture signal is input into the input terminal 2 which is the base of transistor T1 and when the electric potential of the term of this pulse at the emitter T1 is assumed to be V3(a), the voltage waveform (c) at output terminal 3 showing the electric potential at the peak of synchronizing signal is V5 = V3 - R1.l1 and the electric potential is kept constant regardless of the level of composite picture signal input into the input terminal 1. Therefore, when the peak value electric potential of waveform(c) is V6, the value of V6 - V5 is the level of synchronizing signal at terminal 3. The value of V6 at terminal 3 varies in propertion to the level of synchronizing signal of the composite picture signal which is input into terminal 1 and, therefore, the gain control signal of AGC circuit can be obtained by detecting the peak of V6.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16047477A JPS5492126A (en) | 1977-12-29 | 1977-12-29 | Agc voltage detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16047477A JPS5492126A (en) | 1977-12-29 | 1977-12-29 | Agc voltage detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5492126A true JPS5492126A (en) | 1979-07-21 |
JPS5758106B2 JPS5758106B2 (en) | 1982-12-08 |
Family
ID=15715727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16047477A Granted JPS5492126A (en) | 1977-12-29 | 1977-12-29 | Agc voltage detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5492126A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5713869A (en) * | 1980-06-26 | 1982-01-23 | Matsushita Electric Ind Co Ltd | Agc voltage detector |
-
1977
- 1977-12-29 JP JP16047477A patent/JPS5492126A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5713869A (en) * | 1980-06-26 | 1982-01-23 | Matsushita Electric Ind Co Ltd | Agc voltage detector |
JPS6351432B2 (en) * | 1980-06-26 | 1988-10-13 | Matsushita Electric Ind Co Ltd |
Also Published As
Publication number | Publication date |
---|---|
JPS5758106B2 (en) | 1982-12-08 |
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