JPS5588433A - Afc device - Google Patents
Afc deviceInfo
- Publication number
- JPS5588433A JPS5588433A JP16573378A JP16573378A JPS5588433A JP S5588433 A JPS5588433 A JP S5588433A JP 16573378 A JP16573378 A JP 16573378A JP 16573378 A JP16573378 A JP 16573378A JP S5588433 A JPS5588433 A JP S5588433A
- Authority
- JP
- Japan
- Prior art keywords
- discrimination output
- frequency shift
- diodes
- parallel
- local oscillation
- 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
- 230000010355 oscillation Effects 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Television Receiver Circuits (AREA)
Abstract
PURPOSE:To avoid the interference due to the undesired signal contained in the discrimination output by detecting the frequency shift of the VIF signals through the frequency discriminator and then applying the frequency shift to the variable capacity diode of the local oscillation circuit via the diodes which are connected in parallel and with the opposite polarities to each other. CONSTITUTION:The frequency shift is detected for the VIF signals through frequency discriminator 14 of the Foster-Seeley circuit or the like and then converted into the low impedance through transistor Tr15 to generate the discrimination output. This discrimination output is applied to one end of diodes 12a and 12b each which are connected in parallel and with the opposite polarities to each other and then extracted through the other end to be applied to AFC variable capacity diode 16 of local oscillation circuit 3. As a result, the interference caused by the undesired signal of the component or the like of the video signal contained in the discrimination output can be avoided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16573378A JPS5588433A (en) | 1978-12-26 | 1978-12-26 | Afc device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16573378A JPS5588433A (en) | 1978-12-26 | 1978-12-26 | Afc device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5588433A true JPS5588433A (en) | 1980-07-04 |
Family
ID=15818034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16573378A Pending JPS5588433A (en) | 1978-12-26 | 1978-12-26 | Afc device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5588433A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5126452A (en) * | 1974-08-29 | 1976-03-04 | Fujitsu Ltd |
-
1978
- 1978-12-26 JP JP16573378A patent/JPS5588433A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5126452A (en) * | 1974-08-29 | 1976-03-04 | Fujitsu Ltd |
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