JPS57194681A - System discriminating circuit of television signal - Google Patents
System discriminating circuit of television signalInfo
- Publication number
- JPS57194681A JPS57194681A JP8131481A JP8131481A JPS57194681A JP S57194681 A JPS57194681 A JP S57194681A JP 8131481 A JP8131481 A JP 8131481A JP 8131481 A JP8131481 A JP 8131481A JP S57194681 A JPS57194681 A JP S57194681A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pulse
- output
- frame frequency
- discriminated
- 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
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To decrease the number of component parts and to reduce the cost for a system discriminating circuit for two TV signals having different frame frequencies, by switching the two circuit states of an automatic dscriminating circuit by switching the inverse and non-inverse actions of a logical circuit. CONSTITUTION:The vertical pulse 1 given from a vertical synchronizing and separating circuit is turned into a signal 10 to be discriminated through a delaying circuit 3. A horizontal pulse 2 sent from a horizontal oscillating circuit is supplied to a counter 4. Whether the frame frequency being 50Hz or 60Hz is discriminated by the fact that a flip-flop 8 is set or not and by the output Q7 obtained by counting down the pulse 2 to 1/64 from a moment when a pulse is delayed by 6ms through a monostable 3 when the signal 10 has 50Hz frame frequency and the output Q8 obtained by counting down the output Q7 to 1/2. The malfunction preventing function works to the noise mixing when the decision is given to whether the frame frequency is 50Hz or 60Hz in accordance with the ON or OFF of a switch 12. A capacitor 17 functions to prevent the spark.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8131481A JPS57194681A (en) | 1981-05-26 | 1981-05-26 | System discriminating circuit of television signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8131481A JPS57194681A (en) | 1981-05-26 | 1981-05-26 | System discriminating circuit of television signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57194681A true JPS57194681A (en) | 1982-11-30 |
Family
ID=13742927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8131481A Pending JPS57194681A (en) | 1981-05-26 | 1981-05-26 | System discriminating circuit of television signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57194681A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6086967A (en) * | 1983-09-15 | 1985-05-16 | プレツシイ・オーバーシーズ・リミテツド | Circuit for converting one television scanning reference to another scanning reference |
-
1981
- 1981-05-26 JP JP8131481A patent/JPS57194681A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6086967A (en) * | 1983-09-15 | 1985-05-16 | プレツシイ・オーバーシーズ・リミテツド | Circuit for converting one television scanning reference to another scanning reference |
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