JPS5578638A - Television picture receiver - Google Patents
Television picture receiverInfo
- Publication number
- JPS5578638A JPS5578638A JP15242078A JP15242078A JPS5578638A JP S5578638 A JPS5578638 A JP S5578638A JP 15242078 A JP15242078 A JP 15242078A JP 15242078 A JP15242078 A JP 15242078A JP S5578638 A JPS5578638 A JP S5578638A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- divider
- output
- reference oscillator
- division ratio
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To simplify the circuit constitution by making one reference oscillator double the PLL channel selection, the local oscillation and the video detecting oscillation each. CONSTITUTION:The output of reference oscillator 18 is applied to dividers 20 and 19. The division ratio of divider 19 can be varied by the indication given from channel selector 21 to be used the input to mixer 15 for obtaining the necessary IF frequency to the reception channel. While divider 20 features a fixed division ratio with its output frequency matched to the IF frequency. Then the video signal is obtained by having the synchronous detection with the division output. Phase control circuits 22 and 23 control divider 19 in case the transmission frequency gets out of position to keep the frequency at the normal IF frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15242078A JPS5578638A (en) | 1978-12-07 | 1978-12-07 | Television picture receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15242078A JPS5578638A (en) | 1978-12-07 | 1978-12-07 | Television picture receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5578638A true JPS5578638A (en) | 1980-06-13 |
Family
ID=15540116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15242078A Pending JPS5578638A (en) | 1978-12-07 | 1978-12-07 | Television picture receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5578638A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63139409A (en) * | 1986-12-02 | 1988-06-11 | Fujitsu Ltd | Fm receiver |
-
1978
- 1978-12-07 JP JP15242078A patent/JPS5578638A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63139409A (en) * | 1986-12-02 | 1988-06-11 | Fujitsu Ltd | Fm receiver |
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