JPS57143988A - Reception state detecting circuit of television receiver - Google Patents
Reception state detecting circuit of television receiverInfo
- Publication number
- JPS57143988A JPS57143988A JP56029431A JP2943181A JPS57143988A JP S57143988 A JPS57143988 A JP S57143988A JP 56029431 A JP56029431 A JP 56029431A JP 2943181 A JP2943181 A JP 2943181A JP S57143988 A JPS57143988 A JP S57143988A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- broadcast
- reception state
- confirmation
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
PURPOSE:To detect an accurate reception state without malfunction by detecting whether a broadcast is received or not by confirming the S-shaped characteristics of an automatic frequency fine adjustment voltage after locking the frequency of a frequency synthesizer PLL circuit. CONSTITUTION:During search channel selection, a coincidence signal between a horizontal signal from a synchronous separating circuit 9 and a flyback pulse from a flayback transformer 12 is supplied to and integrated by a prescribed extent through an integrating circuit 25, whose output is inputted to a controller 21. This controller 21 confirms that a broadcast is received. This confirmation, however, is not completely accurate. For the purpose, when the occurrence of the broadcast reception is confirmed, the frequency division ratio of the programmable divider 16 of a frequency synthesizer PLL circuit B is varies in an increasing and a decreasing direction to vary the lock frequency of a PLL, and an AFT (automatic frequency fine adjustment) voltage from an AFT circuit 8, based upon said variation, is checked to confirm whether it has S-shaped characteristics or not. After this confirmation, the frequency division ratio is returned to the original value and the search channel selection ends.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56029431A JPS57143988A (en) | 1981-03-03 | 1981-03-03 | Reception state detecting circuit of television receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56029431A JPS57143988A (en) | 1981-03-03 | 1981-03-03 | Reception state detecting circuit of television receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57143988A true JPS57143988A (en) | 1982-09-06 |
Family
ID=12275945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56029431A Pending JPS57143988A (en) | 1981-03-03 | 1981-03-03 | Reception state detecting circuit of television receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57143988A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0257552A2 (en) * | 1986-08-20 | 1988-03-02 | Mitsubishi Denki Kabushiki Kaisha | Television signal selection device |
-
1981
- 1981-03-03 JP JP56029431A patent/JPS57143988A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0257552A2 (en) * | 1986-08-20 | 1988-03-02 | Mitsubishi Denki Kabushiki Kaisha | Television signal selection device |
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