JPS5560376A - Automatic gain controller of facsimile receiver - Google Patents
Automatic gain controller of facsimile receiverInfo
- Publication number
- JPS5560376A JPS5560376A JP13257978A JP13257978A JPS5560376A JP S5560376 A JPS5560376 A JP S5560376A JP 13257978 A JP13257978 A JP 13257978A JP 13257978 A JP13257978 A JP 13257978A JP S5560376 A JPS5560376 A JP S5560376A
- Authority
- JP
- Japan
- Prior art keywords
- output level
- amplifier
- capacitor
- level
- discharging
- 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
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Television Receiver Circuits (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE: To stabilize the maximum value of a signal with relatively-fast response by reducing influences of noises by forming a discharge circuit for a capacitor charged by the output of an amplifier only when an output level is less than a fixed value.
CONSTITUTION: A facsimile signal applied to input terminal 1 is amplified by amplifier 2 and then outputted to terminal 4. Then, when an output level exceeds the level of reference voltage 5, transistors Tr7 and Tr11 conduct to charge capacitors 9 and 11. The resistance value of variable resistance element 3 of the negative feedback circuit of amplifier 2 is varied by discharging capacitor 9 to keep the output level constant. On the other hand, Tr16 is turned OFF by discharging capacitor 8. Further, when the output level varied with the input, Tr11 is OFF and Tr16 is ON to discharge capacitor 9 by way of discharging resistance 8 and Tr16. Then, the gain of amplifier 2 increases according to the dischrage to decrease the output level down to the set level.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13257978A JPS5560376A (en) | 1978-10-30 | 1978-10-30 | Automatic gain controller of facsimile receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13257978A JPS5560376A (en) | 1978-10-30 | 1978-10-30 | Automatic gain controller of facsimile receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5560376A true JPS5560376A (en) | 1980-05-07 |
JPS6325554B2 JPS6325554B2 (en) | 1988-05-25 |
Family
ID=15084617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13257978A Granted JPS5560376A (en) | 1978-10-30 | 1978-10-30 | Automatic gain controller of facsimile receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5560376A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59202769A (en) * | 1983-05-04 | 1984-11-16 | Fuji Xerox Co Ltd | Automatic adjusting circuit of background level |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5040263A (en) * | 1973-08-16 | 1975-04-12 |
-
1978
- 1978-10-30 JP JP13257978A patent/JPS5560376A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5040263A (en) * | 1973-08-16 | 1975-04-12 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59202769A (en) * | 1983-05-04 | 1984-11-16 | Fuji Xerox Co Ltd | Automatic adjusting circuit of background level |
Also Published As
Publication number | Publication date |
---|---|
JPS6325554B2 (en) | 1988-05-25 |
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