JPS5780887A - Synchronizing signal circuit - Google Patents
Synchronizing signal circuitInfo
- Publication number
- JPS5780887A JPS5780887A JP15681980A JP15681980A JPS5780887A JP S5780887 A JPS5780887 A JP S5780887A JP 15681980 A JP15681980 A JP 15681980A JP 15681980 A JP15681980 A JP 15681980A JP S5780887 A JPS5780887 A JP S5780887A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- synchronizing signal
- disturbance
- drop
- pll circuit
- 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
- H04N5/04—Synchronising
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
Abstract
PURPOSE:To reduce the disturbance of the synchronization of a PLL circuit to shorten the restoration time, by providing a monostable multivibrator which detects the drop-out of an input synchronizing signal and by supplying substitutional pulses to the PLL circuit at the drop-out detection time. CONSTITUTION:When an input synchronizing signal is dropped out, a monostable multivibrator 1 is inverted, and this state is sent to a differentiating circuit 2. The differentiating circuit 2 differentiates the rise part of the monostable multivibrator 1 and sends the result to a waveform shaping circuit 3. The output of the waveform shaping circuit 3 is supplied to an OR circuit 4 together with a horizontal synchronizing signal, and they are added to interpolate the dropped-out horizontal synchronizing signal. Consequently, since horizontal synchronizing pulses without drop-out are supplied to a PLL circuit 5, the disturbance of synchronization of the PLL circuit is reduced, and the restoration time for the disturbance is shortened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15681980A JPS5780887A (en) | 1980-11-06 | 1980-11-06 | Synchronizing signal circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15681980A JPS5780887A (en) | 1980-11-06 | 1980-11-06 | Synchronizing signal circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5780887A true JPS5780887A (en) | 1982-05-20 |
Family
ID=15636026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15681980A Pending JPS5780887A (en) | 1980-11-06 | 1980-11-06 | Synchronizing signal circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5780887A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61233469A (en) * | 1985-04-08 | 1986-10-17 | Sony Corp | Reproducing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5521636A (en) * | 1978-08-04 | 1980-02-15 | Hitachi Ltd | Compensation circuit for missing horizontal synchronizing signal |
-
1980
- 1980-11-06 JP JP15681980A patent/JPS5780887A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5521636A (en) * | 1978-08-04 | 1980-02-15 | Hitachi Ltd | Compensation circuit for missing horizontal synchronizing signal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61233469A (en) * | 1985-04-08 | 1986-10-17 | Sony Corp | Reproducing device |
| JPH0656698B2 (en) * | 1985-04-08 | 1994-07-27 | ソニー株式会社 | Playback device |
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