JPS55102982A - Synchronizing detection circuit - Google Patents
Synchronizing detection circuitInfo
- Publication number
- JPS55102982A JPS55102982A JP1078379A JP1078379A JPS55102982A JP S55102982 A JPS55102982 A JP S55102982A JP 1078379 A JP1078379 A JP 1078379A JP 1078379 A JP1078379 A JP 1078379A JP S55102982 A JPS55102982 A JP S55102982A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplifier
- synchronizing signal
- output
- synchronizing
- 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
Abstract
PURPOSE: To obtain an extremely-stable synchronizing signal by obtaining an output turning to a frequency corresponding to the synchronizing signal peak level of a video signal from a reproduced FM signal and then by detecting a synchronizing signal by detection the envelope of the output.
CONSTITUTION: Reproduced RF signal (a) obtained by passing an RF signal from video head 2 through reproducing RF amplifier 3 is supplied to tuning amplifier 17. Since this amplifier 17 has its tuning point at an FM frequency corresponding to the peak level of a synchronizing signal in a video signal, it generates an output of RF signal (e) with its peak at the synchronizing signal part. This output E is adjusted to constant amplitude by limiter 18, amplified by turning amplifier 19 with the same frequency as amplifier 17, and detected by envelope detection circuit 20. Synchronizing signal SYNC2 is obtained from this circuit 20. Since this synchronizing signal passes through two amplifiers 17 and 19, it becomes extremely stable. Further, the output of amplifier 3 is FM-demodulated 8 through dropout compensation circuit DOC and synchronously separated 16 to obtain synchronizing signal SYNC1, but respective synchronizing signals can be extracted by change-over circuit 5.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1078379A JPS55102982A (en) | 1979-01-31 | 1979-01-31 | Synchronizing detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1078379A JPS55102982A (en) | 1979-01-31 | 1979-01-31 | Synchronizing detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55102982A true JPS55102982A (en) | 1980-08-06 |
JPS6248953B2 JPS6248953B2 (en) | 1987-10-16 |
Family
ID=11759926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1078379A Granted JPS55102982A (en) | 1979-01-31 | 1979-01-31 | Synchronizing detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55102982A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58117784A (en) * | 1982-01-06 | 1983-07-13 | Pioneer Video Corp | Reproduced synchronizing signal generator |
JPS58117783A (en) * | 1982-01-06 | 1983-07-13 | Pioneer Video Corp | Reproduced synchronizing signal generator |
US6708145B1 (en) * | 1999-01-27 | 2004-03-16 | Coding Technologies Sweden Ab | Enhancing perceptual performance of sbr and related hfr coding methods by adaptive noise-floor addition and noise substitution limiting |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4940627A (en) * | 1972-08-24 | 1974-04-16 |
-
1979
- 1979-01-31 JP JP1078379A patent/JPS55102982A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4940627A (en) * | 1972-08-24 | 1974-04-16 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58117784A (en) * | 1982-01-06 | 1983-07-13 | Pioneer Video Corp | Reproduced synchronizing signal generator |
JPS58117783A (en) * | 1982-01-06 | 1983-07-13 | Pioneer Video Corp | Reproduced synchronizing signal generator |
US6708145B1 (en) * | 1999-01-27 | 2004-03-16 | Coding Technologies Sweden Ab | Enhancing perceptual performance of sbr and related hfr coding methods by adaptive noise-floor addition and noise substitution limiting |
USRE43189E1 (en) * | 1999-01-27 | 2012-02-14 | Dolby International Ab | Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting |
Also Published As
Publication number | Publication date |
---|---|
JPS6248953B2 (en) | 1987-10-16 |
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