CN2114256U - Field locking time base correcting interface controller for domestic videocorder - Google Patents
Field locking time base correcting interface controller for domestic videocorder Download PDFInfo
- Publication number
- CN2114256U CN2114256U CN 92203949 CN92203949U CN2114256U CN 2114256 U CN2114256 U CN 2114256U CN 92203949 CN92203949 CN 92203949 CN 92203949 U CN92203949 U CN 92203949U CN 2114256 U CN2114256 U CN 2114256U
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- CN
- China
- Prior art keywords
- time base
- output
- signal
- interface controller
- input
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- Television Signal Processing For Recording (AREA)
Abstract
The utility model discloses a field locking time base correcting interface controller for domestic video recorder which is composed of a casing and an internal detecting circuit. The circuit part comprises an input and output part for leading synchronizing signal and an output part for detecting control signal. The utility model can make the domestic video recorder and a time base correcting device be used in matching way; the utility model can the played image of the domestic video recorder not sway, not shake, not twist, and not have the phenomenon of broom-finish and color loss; the signal-to-noise ratio can improve 6 db and the image can reach the television standard.
Description
The utility model relates to a kind of interface controller that the time base correction technology is applied to home video tape recording.
Photo video equipment divides three kinds of quality class: top-quality broadcast level, the VHS series family expenses level that medium VO series service level and quality scale are minimum.Though family expenses level photo video equipment quality scale is low, it is low with equipment cost, and video tape is cheap, and recording playback is as advantages such as the time are long, and is used by some TV stations at county level and some prefecture-level TV stations.Spectators see through regular meeting occurring image plucking (horizontal black and white interfering line) on the screen when the little band program that the platform that televiews is play with home video tape recording, rock shake, distortion, symptoms such as top row coloured silk.This is because video tape recorder mechanical part precision is not enough, there is error in the servo loop system, it is just the same when the relative velocity of magnetic head and tape can not and write down, and the time base error that reason such as tape geometry deformation causes causes, and broadcast level and service level video tape recorder are the time base errors of eliminating video tape recorder with the method for time base correction.And the servo system of home video tape recording when recording status, is isolated field sync signal as servo reference signal from be recorded signal; When playback mode, frequency division obtains servo reference signal from the 4.43MHZ crystal oscillator, and the switching of these two signals is system's control, finishes in servo integrated package inside, and the leading synchronous control signal that can't introduce time base corrector is as servo benchmark, so can't eliminate time base error.Some use has the time base corrector of non-lock function, but it can only reduce the flating of home video tape recording, colour is lost, and can not fundamentally eliminate the time base error of home video tape recording, more can not make home video tape recording carry out that stunt is switched and stunt is manufactured.
The purpose of this utility model is that the servo system of home video tape recording is improved, and makes home video tape recording possess the function of using time base corrector, improves the picture quality of home video tape recording.
The utility model is made up of shell and inner testing circuit.Circuit part comprises leading synchronizing signal input, output and detection control signal output and power supply power pack.R
1As input load resistance NAND gate ic chip
1Input links, R
2The shunt voltage negative feedback resistor is from IC
1Output feed back to input, IC
1Play signal and amplify and shaping operation R
1, R
2, IC
1Constitute signal input, output.The control signal output is by R
3, C, IC
1, IC
2Form.Detect resistance R
3With IC
1Output links, and introduces detection signal, R
3The other end and IC
2Input connects, R
3With IC
2Between the capacitor C that detects in parallel, detect capacitor C and detect control voltage and be input to non-gate ic IC
2, IC
2Export a low level control signal; While IC
2The NAND gate ic chip
3Series connection makes IC
3The output high-level control signal.Shell is made cuboid, and six fairleads are arranged on its surface.The utility model is inserted the home video machine servo system, can make it have the function of time base correction.
The utility model makes home video tape recording and the supporting use of time base corrector energy, makes home video tape recording broadcast image and does not rock, and does not shake, and is non-warping, no plucking, and netrual colour is lost phenomenon, and signal to noise ratio improves 6 decibels (6db), makes picture quality reach television standard.
Below in conjunction with accompanying drawing, further specify the utility model.
Fig. 1, the servo integrated package schematic diagram of home video tape recording;
Fig. 2, the utility model installation diagram;
Fig. 3, the utility model circuit theory diagrams;
Fig. 4, the utility model outside drawing.
Referring to Fig. 3, Fig. 4, after leading synchronizing signal is by input 14 inputs, through non-gate ic IC
1After amplifying shaping, the leading synchronous signal output end 22 of one road warp is input to the home video machine servo system; Another road is by detecting resistance R
3, detecting capacitor C, detection signal makes not gate IC
2Anti-phase output low level L control signal, output are 24; This low level signal is again through inverter ic simultaneously
3Anti-phase, output high level H control signal, output is 23.R
1, R
2Be respectively input load resistance and feedback resistance.Among Fig. 4,25,26 is fairlead, and Fig. 1 is the existing servo integrated package schematic diagram of home video tape recording, and among Fig. 1, when recording status, isolated field sync signal is by input 1 input, behind 2 frequency dividers, 3 frequency divisions, as servo reference signal from be recorded signal; When playback mode, 4.43MHZ crystal oscillator signal is by input 2 input, through behind frequency divider 4 frequency divisions as servo reference signal, 5 is reference signal diverter switches among Fig. 1, shown in the figure dissengaged positions, the 6th, reference signal output, the 7th, the control end of reference signal diverter switch.This servo system can't be used time base corrector, if introducing the utility model, as Fig. 2, on the family expenses video tape recorder, offer leading synchronous signal input end mouth 11, install one at field sync signal input 1 place of former servo system and switch switch 8, the utility model output 22 is connected with diverter switch 8, low level L signal output part 24 connects with diverter switch 5, high level H signal output part 23 connects with diverter switch 8, and leading synchronous signal input end 14 connects with time base corrector 10 leading synchronous output ends 12.After the leading synchronizing signal input of basic at that time adjuster, high-level control signal by output 23 outputs makes diverter switch 8 cut off field synchronization split circuit 1 automatically, directly insert leading synchronizing signal, simultaneously from the low level control signal of output 24 output, make inner diverter switch 5 actions of servo integrated package, cut leading synchronizing signal as servo reference signal, so just make home video tape recording be in the time base correction state of the leading Synchronization Control of base when being subjected to.Be this state shown in Fig. 2.Picture signal is processed luminance and chrominance information in time base corrector, and coding becomes the composite video signal that meets the radio and television standard at last, exports from 13 ports.
If when not having leading synchronizing signal to import, testing circuit produces control signal makes video tape recorder automatically restore to original video state, and function originally is constant.
Home video tape recording is locked time base correction through the field, can directly carry out stunt switching and stunt making etc. at the stunt cut bank.
Claims (2)
1, a kind of home video tape recording field locking time base correction interface controller comprises shell, it is characterized in that: circuit part is by by load resistance R
1, feedback resistance R
2, non-gate ic IC
1The signal input of forming, output and by detecting resistance R
3, detect capacitor C, non-gate ic IC
2, IC
3The detection control signal output of forming is formed, R
1With IC
1Input links, R
2With IC
1Parallel connection, R
3With IC
1Output and IC
2Input connect, at R
3With IC
2Between shunt capacitance C, IC
2, IC
3Series connection, its output respectively draws a bars output line.
2, interface controller according to claim 1 is characterized in that shell does rectangularity, and six fairleads are arranged above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92203949 CN2114256U (en) | 1992-03-04 | 1992-03-04 | Field locking time base correcting interface controller for domestic videocorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92203949 CN2114256U (en) | 1992-03-04 | 1992-03-04 | Field locking time base correcting interface controller for domestic videocorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2114256U true CN2114256U (en) | 1992-08-26 |
Family
ID=4950473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92203949 Withdrawn CN2114256U (en) | 1992-03-04 | 1992-03-04 | Field locking time base correcting interface controller for domestic videocorder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2114256U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158655A (en) * | 2011-01-27 | 2011-08-17 | 大连科迪视频技术有限公司 | Jitter-free post-correction system for digital video interface (DVI)/high definition multimedia interface (HDMI)/display port (DP)/video graphics array (VGA) signals |
-
1992
- 1992-03-04 CN CN 92203949 patent/CN2114256U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158655A (en) * | 2011-01-27 | 2011-08-17 | 大连科迪视频技术有限公司 | Jitter-free post-correction system for digital video interface (DVI)/high definition multimedia interface (HDMI)/display port (DP)/video graphics array (VGA) signals |
| CN102158655B (en) * | 2011-01-27 | 2012-09-26 | 大连科迪视频技术有限公司 | Jitter-free post-correction system for digital video interface (DVI)/high definition multimedia interface (HDMI)/display port (DP)/video graphics array (VGA) signals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |