JPS54162526A - Vertical synchronizing detection system in pcm system recorder-reproducer - Google Patents
Vertical synchronizing detection system in pcm system recorder-reproducerInfo
- Publication number
- JPS54162526A JPS54162526A JP7108178A JP7108178A JPS54162526A JP S54162526 A JPS54162526 A JP S54162526A JP 7108178 A JP7108178 A JP 7108178A JP 7108178 A JP7108178 A JP 7108178A JP S54162526 A JPS54162526 A JP S54162526A
- Authority
- JP
- Japan
- Prior art keywords
- vertical synchronizing
- signal
- period
- time
- counter
- 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.)
- Granted
Links
Landscapes
- Synchronizing For Television (AREA)
- Television Signal Processing For Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
PURPOSE: To readily and rately detect vertical synchronizing by detecting the portion where the rise interval at the last period of the vertical synchronizing pulse period of the composite period signal is extremely narrow.
CONSTITUTION: The composite synchronizing signal Sc being applied to input terminal 30 is applied to the clear terminal 37a of a counter 37 through a differentiating circuit 31. A counter 37 maintains the level "H" during the time since the signal Sc rose until the counter counts 16 pulses of 2.0475M Hz, i.e., for a period of 8μ sec. Beyond this the level goes to "L" and the above is repeated. Here, the clear of an FF 38 is released at the rise (time t1) of the final unit pulse PA of the vertical synchronizing pulse period and the inversion output thereofis made "L" so that the data input of an FF 39 is forcefully made "H". When the data are read in at the next rise (time t2) of the signal Sc, the non-inversion output of the FF 39 becomes "H" and the inversion output "L". Such "L" output becomes the vertical synchronizing detection signal.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7108178A JPS54162526A (en) | 1978-06-13 | 1978-06-13 | Vertical synchronizing detection system in pcm system recorder-reproducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7108178A JPS54162526A (en) | 1978-06-13 | 1978-06-13 | Vertical synchronizing detection system in pcm system recorder-reproducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54162526A true JPS54162526A (en) | 1979-12-24 |
| JPS6243266B2 JPS6243266B2 (en) | 1987-09-12 |
Family
ID=13450211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7108178A Granted JPS54162526A (en) | 1978-06-13 | 1978-06-13 | Vertical synchronizing detection system in pcm system recorder-reproducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54162526A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61191169A (en) * | 1985-02-14 | 1986-08-25 | Sony Tektronix Corp | Separating circuit for vertical synchronizing signal |
| JPS6481576A (en) * | 1987-09-24 | 1989-03-27 | Toshiba Corp | Frame detection circuit for television signal |
-
1978
- 1978-06-13 JP JP7108178A patent/JPS54162526A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61191169A (en) * | 1985-02-14 | 1986-08-25 | Sony Tektronix Corp | Separating circuit for vertical synchronizing signal |
| JPS6481576A (en) * | 1987-09-24 | 1989-03-27 | Toshiba Corp | Frame detection circuit for television signal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6243266B2 (en) | 1987-09-12 |
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