JPS5552506A - Agc circuit of vtr - Google Patents
Agc circuit of vtrInfo
- Publication number
- JPS5552506A JPS5552506A JP12302878A JP12302878A JPS5552506A JP S5552506 A JPS5552506 A JP S5552506A JP 12302878 A JP12302878 A JP 12302878A JP 12302878 A JP12302878 A JP 12302878A JP S5552506 A JPS5552506 A JP S5552506A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- output
- voltage
- circuit
- 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.)
- Pending
Links
Abstract
PURPOSE: To reduce pins of IC in number, to simplify an AGC adjustment and to decrease greatly temperature drift by adding a constant current circuit and then by sharing respective bias voltages.
CONSTITUTION: A composite video signal is inputted to AGC amplifier A1, the output of which is supplied through chroma signal removal circuit CR to amplifier A2; and a synchronizing signal component in the signal is clamped by synchronous clamping circuit SC and a fixed voltage is applied to the output of amplifier A2 by switching the synchronizing signal by the output of saw-tooth wave converter circuit SR. Then, the applied voltage is detected by diode D and inputted direct to amplifier A3. Its output is supplied to resistance R1 through amplifier A4. Here, the one- terminal input voltage of amplifier A3 and the output voltage of amplifier A2 are made to depend upon reference voltage Vr1 and a fixed current is drawn from the output of amplifier A3 to the earth point by a constant current circuit. Consequently, the reduction in number of pins, the simplification of an AGC adjustment and the improvement of temperature characteristics in case of IC-implementation can be attained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12302878A JPS5552506A (en) | 1978-10-05 | 1978-10-05 | Agc circuit of vtr |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12302878A JPS5552506A (en) | 1978-10-05 | 1978-10-05 | Agc circuit of vtr |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5552506A true JPS5552506A (en) | 1980-04-17 |
Family
ID=14850421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12302878A Pending JPS5552506A (en) | 1978-10-05 | 1978-10-05 | Agc circuit of vtr |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5552506A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4626910A (en) * | 1983-12-13 | 1986-12-02 | Fuji Photo Film Co., Ltd. | Circuit for preventing flicker attributable to field signal-frame signal conversion |
-
1978
- 1978-10-05 JP JP12302878A patent/JPS5552506A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4626910A (en) * | 1983-12-13 | 1986-12-02 | Fuji Photo Film Co., Ltd. | Circuit for preventing flicker attributable to field signal-frame signal conversion |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2432252A1 (en) | IMAGE SYNCHRONIZER COMPRISING A WRITE-INHIBITION CIRCUIT | |
JPS5479384A (en) | System of synchronously leading in phase locked loop | |
JPS566578A (en) | Video switch circuit | |
JPS5571362A (en) | Picture synthesizing unit | |
JPS5552506A (en) | Agc circuit of vtr | |
AU581127B2 (en) | Charge-coupled semiconductor device with dynamic control | |
JPS5627580A (en) | Signal processor | |
JPS53125724A (en) | Color television receiver | |
JPS54128258A (en) | Fm detection circuit | |
JPS5525279A (en) | Automatic frequency tuning defeat device | |
JPS53106522A (en) | Index system color television receiver | |
JPS5570187A (en) | Color pickup device | |
JPS56169969A (en) | Synchronisum separation circuit | |
JPS5577287A (en) | Color television receiver of beam index type | |
JPS5592081A (en) | Adjustment unit of television receiver | |
JPS5350610A (en) | Video signal processing circuit | |
JPS5646385A (en) | Dropout compensating circuit | |
JPS52144221A (en) | Ghost delection circuit system | |
JPS5631288A (en) | Beam index type color television receiver | |
JPS5698795A (en) | High-speed sample holding and comparing circuit | |
JPS6032481A (en) | Focus signal generating device using video signal | |
JPS56149883A (en) | Beam index color television receiver of linear sequential system | |
JPS5474714A (en) | Signal distortion improvement circuit | |
JPS5454522A (en) | Frequency converter | |
JPH0230204A (en) | Multiplier |