JPS6481576A - Frame detection circuit for television signal - Google Patents
Frame detection circuit for television signalInfo
- Publication number
- JPS6481576A JPS6481576A JP23733687A JP23733687A JPS6481576A JP S6481576 A JPS6481576 A JP S6481576A JP 23733687 A JP23733687 A JP 23733687A JP 23733687 A JP23733687 A JP 23733687A JP S6481576 A JPS6481576 A JP S6481576A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frame
- circuit
- detection
- identification signal
- 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
Landscapes
- Synchronizing For Television (AREA)
Abstract
PURPOSE:To attain frame detection even if a reproduction speed deviation of a VDP or the like takes place by using two kinds of frame identification signals with different waveform and three detection circuits. CONSTITUTION:A frame identification signal 4 has an alternate period being twice that of the frame identification signal 5. A video signal 31 is formed into a binarizing signal 10 by a comparator 9. The identification signal 4 is detected by the 1st detection circuit comprising a delay circuit 11 having a delay time being a half the period of the signal 4 and an exclusive OR circuit 15. In this case, a delay circuit 19 and an OR circuit 21 absorb a negative pulse in a short time based on the reproduction speed error end a consecutive detection signal 23 is obtained. Similarly, an identification signal 5 is detected by circuits 12, 16, 20, 22 and an output 24 is obtained. A frame discrimination circuit 29 outputs a frame detection output 30 when the time difference between the outputs 23, 24 is within the permissible range of one horizontal period.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23733687A JPS6481576A (en) | 1987-09-24 | 1987-09-24 | Frame detection circuit for television signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23733687A JPS6481576A (en) | 1987-09-24 | 1987-09-24 | Frame detection circuit for television signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6481576A true JPS6481576A (en) | 1989-03-27 |
Family
ID=17013869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23733687A Pending JPS6481576A (en) | 1987-09-24 | 1987-09-24 | Frame detection circuit for television signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6481576A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5168716A (en) * | 1974-12-11 | 1976-06-14 | Matsushita Electric Ind Co Ltd | FUIIRUDOHANBETSUSOCHI |
JPS54162526A (en) * | 1978-06-13 | 1979-12-24 | Nippon Gakki Seizo Kk | Vertical synchronizing detection system in pcm system recorder-reproducer |
JPS6225579A (en) * | 1985-07-26 | 1987-02-03 | Sony Corp | Synchronizing signal detecting circuit |
-
1987
- 1987-09-24 JP JP23733687A patent/JPS6481576A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5168716A (en) * | 1974-12-11 | 1976-06-14 | Matsushita Electric Ind Co Ltd | FUIIRUDOHANBETSUSOCHI |
JPS54162526A (en) * | 1978-06-13 | 1979-12-24 | Nippon Gakki Seizo Kk | Vertical synchronizing detection system in pcm system recorder-reproducer |
JPS6225579A (en) * | 1985-07-26 | 1987-02-03 | Sony Corp | Synchronizing signal detecting circuit |
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