JPS5563147A - Control circuit for signal detection reference level - Google Patents
Control circuit for signal detection reference levelInfo
- Publication number
- JPS5563147A JPS5563147A JP13589278A JP13589278A JPS5563147A JP S5563147 A JPS5563147 A JP S5563147A JP 13589278 A JP13589278 A JP 13589278A JP 13589278 A JP13589278 A JP 13589278A JP S5563147 A JPS5563147 A JP S5563147A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- level
- data
- supplied
- 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 the desired signal detection reference level in a stable way by detecting both the upper and lower edge levels of the modulated pulse in the reproduced digital signal and then giving the level control to the signal obtained by adding the both detection output.
CONSTITUTION: Both the overshoot and undershoot are reduced via capacitor C2 for the reproduced digital input signal sent from the VTR, and the input signal is supplied to gate circuit 5 via gate circuit 3 and reversing circuit 4. At circuit 3 the data of signal (a) is separated from the horizontal synchronous signal and the reference white chrominance signal via gate pulse (c) given from control circuit 8, and signal (d) thus obtained is supplied to peak holding PH circuit 9. The greater part of the data given from circuit 5 is separated and drawn out, and negative signal (e) featuring a lower level than the upper edge level of the data is supplied to peak holding circuit 11. Circuit 9 delivers the voltage equivalent to the upper edge level of the data, and the voltage equivalent to the lower edge level of the data given from circuit 11 is reversed 13 to be added to the output of circuit 9 at adder circuit 14. Then the output of circuit 14 is controlled via resistance VR to deliver the optimum data detection reference level.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13589278A JPS5563147A (en) | 1978-11-06 | 1978-11-06 | Control circuit for signal detection reference level |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13589278A JPS5563147A (en) | 1978-11-06 | 1978-11-06 | Control circuit for signal detection reference level |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5563147A true JPS5563147A (en) | 1980-05-13 |
JPS627627B2 JPS627627B2 (en) | 1987-02-18 |
Family
ID=15162233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13589278A Granted JPS5563147A (en) | 1978-11-06 | 1978-11-06 | Control circuit for signal detection reference level |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5563147A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5593824U (en) * | 1978-12-19 | 1980-06-28 | ||
JPH01241245A (en) * | 1988-03-22 | 1989-09-26 | Nec Corp | Data transmission equipment |
-
1978
- 1978-11-06 JP JP13589278A patent/JPS5563147A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5593824U (en) * | 1978-12-19 | 1980-06-28 | ||
JPS6343624Y2 (en) * | 1978-12-19 | 1988-11-14 | ||
JPH01241245A (en) * | 1988-03-22 | 1989-09-26 | Nec Corp | Data transmission equipment |
Also Published As
Publication number | Publication date |
---|---|
JPS627627B2 (en) | 1987-02-18 |
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