JPS54128624A - Automatic frequency control unit - Google Patents
Automatic frequency control unitInfo
- Publication number
- JPS54128624A JPS54128624A JP3606978A JP3606978A JPS54128624A JP S54128624 A JPS54128624 A JP S54128624A JP 3606978 A JP3606978 A JP 3606978A JP 3606978 A JP3606978 A JP 3606978A JP S54128624 A JPS54128624 A JP S54128624A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal obtained
- oscillation frequency
- local oscillation
- malfunction prevention
- 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
Landscapes
- Television Receiver Circuits (AREA)
Abstract
PURPOSE: To make stable the drawing-in of the circuit using a simple synchronous detection, by adding the circuit which can extend the respective drawing range for the higher and lower local variation with the malfunction prevention circuit, in the AFC circuit of the local oscillation frequency of a TV receiver.
CONSTITUTION: In the AFC circuit providing the malfunction prevention circuit 4 which automatically controls the local oscillation frequency of the tuner of a TV receiver and prevents the malfunction due to the self audio signal caused when the local oscillation frequency is varied toward higher, the superposition and mixing circuit 12 superimposing and mixing the synchronous signal obtained from the synchronous separation circuit 10 connected to the video synchronizing detection circuit 9 and the blanking signal obtained from the blanking signal obtained from the blanking signal generating circuit 11, is provided. Further, the rectifying and smoothing circuit 13 rectifying and smoothing the mixed signal obtained from the circuit 12 is provided, the DC voltage of the circuit 13 is used as the control voltage of the malfunction prevention circuit 4 to extend the drawing range of higher and lower local variation.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3606978A JPS54128624A (en) | 1978-03-30 | 1978-03-30 | Automatic frequency control unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3606978A JPS54128624A (en) | 1978-03-30 | 1978-03-30 | Automatic frequency control unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54128624A true JPS54128624A (en) | 1979-10-05 |
Family
ID=12459431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3606978A Pending JPS54128624A (en) | 1978-03-30 | 1978-03-30 | Automatic frequency control unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54128624A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5040225A (en) * | 1973-08-16 | 1975-04-12 |
-
1978
- 1978-03-30 JP JP3606978A patent/JPS54128624A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5040225A (en) * | 1973-08-16 | 1975-04-12 |
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