JPS5465418A - Keyed agc circuit - Google Patents
Keyed agc circuitInfo
- Publication number
- JPS5465418A JPS5465418A JP13223377A JP13223377A JPS5465418A JP S5465418 A JPS5465418 A JP S5465418A JP 13223377 A JP13223377 A JP 13223377A JP 13223377 A JP13223377 A JP 13223377A JP S5465418 A JPS5465418 A JP S5465418A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- agc control
- control voltage
- pulse
- guard
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
Abstract
PURPOSE:To prevent the deterioration the received picture quality caused by the noise piled on the phase signal by generating the pulse synchronized with the guard signal in the facsimile receiver or the like and then setting the AGC control voltage with every frame. CONSTITUTION:Pulse signal generator circuit 6 which delivers synchronized pulse signal Gd is provided at the front edge of guard signal G which is produced in synchronization with phase signal f. Then the smoothing capacitor, which is holding the AGC control voltage within AGC control part 3, is discharged by signal Gd. After this, the phase signal is charged to the smoothing capacitor only while the guard signal is being generated. As a result, the AGC control voltage can be set with every frame.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13223377A JPS5465418A (en) | 1977-11-04 | 1977-11-04 | Keyed agc circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13223377A JPS5465418A (en) | 1977-11-04 | 1977-11-04 | Keyed agc circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5465418A true JPS5465418A (en) | 1979-05-26 |
Family
ID=15076474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13223377A Pending JPS5465418A (en) | 1977-11-04 | 1977-11-04 | Keyed agc circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5465418A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5660165A (en) * | 1979-10-20 | 1981-05-23 | Canon Inc | Picture reader |
JPS56116364A (en) * | 1980-02-19 | 1981-09-12 | Fuji Xerox Co Ltd | Processor for facsimile video signal |
JPS5816973U (en) * | 1981-07-24 | 1983-02-02 | 株式会社東芝 | contrast correction circuit |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5119616B2 (en) * | 1971-11-25 | 1976-06-18 |
-
1977
- 1977-11-04 JP JP13223377A patent/JPS5465418A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5119616B2 (en) * | 1971-11-25 | 1976-06-18 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5660165A (en) * | 1979-10-20 | 1981-05-23 | Canon Inc | Picture reader |
JPS56116364A (en) * | 1980-02-19 | 1981-09-12 | Fuji Xerox Co Ltd | Processor for facsimile video signal |
JPS5816973U (en) * | 1981-07-24 | 1983-02-02 | 株式会社東芝 | contrast correction circuit |
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