JPS57152284A - Television signal system discriminating circuit - Google Patents
Television signal system discriminating circuitInfo
- Publication number
- JPS57152284A JPS57152284A JP3684481A JP3684481A JPS57152284A JP S57152284 A JPS57152284 A JP S57152284A JP 3684481 A JP3684481 A JP 3684481A JP 3684481 A JP3684481 A JP 3684481A JP S57152284 A JPS57152284 A JP S57152284A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- inputted
- dividing
- synchronizing signal
- gate
- 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
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/642—Multi-standard receivers
-
- 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 discriminate TV signal systems by a simple configuration by discriminating a TV signal system from the dividing condition of a variable dividing means switching the TV signal system to the dividing ratio corresponding to plural TV signal systems. CONSTITUTION:A TV signal of an NTSC or a PAL/SEC system is inputted to a synchronizing signal separation circuit 2 and a synchronizing signal E is separated. A pulse signal F having the frequency twice that of a horizontal synchronizing signal is formed from the synchronizing signal E by PLL 3. The signal E is inputted to a 2-stage shift register 4 and a signal I corresponding to the vertical synchronizing signal is obtained from the 1st and 2nd stage output signals G, H. When a signal belonging to the NTSC system is inputted to a terminal 1, a selector 10 selects and AND gate to decode 524, so that the output from a NAND gate is turned to ''0'', an AND gate stops the signal I and turns its output to ''0'' and a FF13 does not change its status. A counter 7 holds the dividing of 525. When a signal belonging to the PAL system is inputted, the same operation is also performed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3684481A JPS57152284A (en) | 1981-03-13 | 1981-03-13 | Television signal system discriminating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3684481A JPS57152284A (en) | 1981-03-13 | 1981-03-13 | Television signal system discriminating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57152284A true JPS57152284A (en) | 1982-09-20 |
Family
ID=12481064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3684481A Pending JPS57152284A (en) | 1981-03-13 | 1981-03-13 | Television signal system discriminating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57152284A (en) |
Cited By (3)
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 |
JPS61141284A (en) * | 1984-12-14 | 1986-06-28 | Hitachi Ltd | System discriminating systemin multiplex tv-receiver |
EP0511798A2 (en) * | 1991-04-30 | 1992-11-04 | The Grass Valley Group, Inc. | Clock generation circuit for multistandard serial digital video with automatic format identification |
-
1981
- 1981-03-13 JP JP3684481A patent/JPS57152284A/en active Pending
Cited By (3)
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 |
JPS61141284A (en) * | 1984-12-14 | 1986-06-28 | Hitachi Ltd | System discriminating systemin multiplex tv-receiver |
EP0511798A2 (en) * | 1991-04-30 | 1992-11-04 | The Grass Valley Group, Inc. | Clock generation circuit for multistandard serial digital video with automatic format identification |
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