JPS54108515A - Detector for signal defective period - Google Patents
Detector for signal defective periodInfo
- Publication number
- JPS54108515A JPS54108515A JP1617578A JP1617578A JPS54108515A JP S54108515 A JPS54108515 A JP S54108515A JP 1617578 A JP1617578 A JP 1617578A JP 1617578 A JP1617578 A JP 1617578A JP S54108515 A JPS54108515 A JP S54108515A
- Authority
- JP
- Japan
- Prior art keywords
- wave
- defective period
- output
- period
- defective
- 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
- Optical Recording Or Reproduction (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE: To make it possible to detect a defective period even when a remarkable disturbance signal is mixed into the defective period of an input carrier, by obtaining the sum output of signals detected by level detection circuits for positive and negative half-wave rectified waves.
CONSTITUTION: An input signal with its amplitude limited by limiter 9 is inputted to half-wave rectifier 10, whose output is applied to LPF11 and level detection circuit 12, thereby detecting the amplitude variation of a positive half wave. Some of the output of limiter 9, after being inverted by inversional amplifier circit 13, is supplied via half-wave rectifier circuit 14 and LPF15 to level detector 16, where the amplitude variation of a negative half wave is detected. Then, detection signals obtained by circuits 12 and 16 are added logically by adder circuit 17. This output allows the perfect detection of the defective period of an input carrier even when a remarkable disturbance signal is mixed in the defective period.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1617578A JPS54108515A (en) | 1978-02-14 | 1978-02-14 | Detector for signal defective period |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1617578A JPS54108515A (en) | 1978-02-14 | 1978-02-14 | Detector for signal defective period |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54108515A true JPS54108515A (en) | 1979-08-25 |
JPS6118270B2 JPS6118270B2 (en) | 1986-05-12 |
Family
ID=11909163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1617578A Granted JPS54108515A (en) | 1978-02-14 | 1978-02-14 | Detector for signal defective period |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54108515A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57150288A (en) * | 1981-03-11 | 1982-09-17 | Matsushita Electric Ind Co Ltd | Drop-out detecting device |
JPS59239A (en) * | 1982-06-25 | 1984-01-05 | Nec Corp | Pulse code modulation signal cut-off detecting circuit |
JPS61158080A (en) * | 1984-12-28 | 1986-07-17 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
JPH02208869A (en) * | 1989-02-08 | 1990-08-20 | Hitachi Ltd | Drop out detecting circuit for recording and reproducing device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6388658U (en) * | 1986-11-28 | 1988-06-09 |
-
1978
- 1978-02-14 JP JP1617578A patent/JPS54108515A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57150288A (en) * | 1981-03-11 | 1982-09-17 | Matsushita Electric Ind Co Ltd | Drop-out detecting device |
JPS6360959B2 (en) * | 1981-03-11 | 1988-11-25 | ||
JPS59239A (en) * | 1982-06-25 | 1984-01-05 | Nec Corp | Pulse code modulation signal cut-off detecting circuit |
JPS61158080A (en) * | 1984-12-28 | 1986-07-17 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
JPH02208869A (en) * | 1989-02-08 | 1990-08-20 | Hitachi Ltd | Drop out detecting circuit for recording and reproducing device |
Also Published As
Publication number | Publication date |
---|---|
JPS6118270B2 (en) | 1986-05-12 |
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