JPS5528611A - Correction circuit for stylus protection time base of video disc reproducing unit - Google Patents
Correction circuit for stylus protection time base of video disc reproducing unitInfo
- Publication number
- JPS5528611A JPS5528611A JP10157178A JP10157178A JPS5528611A JP S5528611 A JPS5528611 A JP S5528611A JP 10157178 A JP10157178 A JP 10157178A JP 10157178 A JP10157178 A JP 10157178A JP S5528611 A JPS5528611 A JP S5528611A
- Authority
- JP
- Japan
- Prior art keywords
- stylus
- time base
- circuit
- loop
- gain
- 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
Landscapes
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE: To reduce the transient large amplitude operation of stylus, and to avoid stylus skip and damage to stylus, by connecting the compensation circuit in the first loop in response to the start of signal reproduction and lowering the open loop gain of the second loop.
CONSTITUTION: The time base variation correction circuit is constituted with the first loop consisting of the phase detector 9 to detect the time base variation component from the video disc reproducing output, first filter 11, and voltage controlled oscillator 12, and the second loop consisting of the phase detector 9, second filter 13 and stretcher 14. Further, at the start of signal reproduction, the switch circuit 26 is connected to the fixed contact d to insert the compensation circuit 24, and the gain of the variable gain circuit 25 is at minimum. After drawing-in, the gain of the variable gain circuit 25 is gradually increased, and the switch 26 is selected to the fixed contact e to reproduce the signal.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10157178A JPS5528611A (en) | 1978-08-21 | 1978-08-21 | Correction circuit for stylus protection time base of video disc reproducing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10157178A JPS5528611A (en) | 1978-08-21 | 1978-08-21 | Correction circuit for stylus protection time base of video disc reproducing unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5528611A true JPS5528611A (en) | 1980-02-29 |
Family
ID=14304082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10157178A Pending JPS5528611A (en) | 1978-08-21 | 1978-08-21 | Correction circuit for stylus protection time base of video disc reproducing unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5528611A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58114314A (en) * | 1981-12-26 | 1983-07-07 | Sharp Corp | Squelching device |
JPH01264011A (en) * | 1988-04-14 | 1989-10-20 | Fuji Electric Co Ltd | Synchronous oscillation circuit |
-
1978
- 1978-08-21 JP JP10157178A patent/JPS5528611A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58114314A (en) * | 1981-12-26 | 1983-07-07 | Sharp Corp | Squelching device |
JPS6342344B2 (en) * | 1981-12-26 | 1988-08-23 | Sharp Kk | |
JPH01264011A (en) * | 1988-04-14 | 1989-10-20 | Fuji Electric Co Ltd | Synchronous oscillation circuit |
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