CN1082800A

CN1082800A - Video signal reproducing apparatus

Info

Publication number: CN1082800A
Application number: CN93108377A
Authority: CN
Inventors: 吴泽东
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 1992-07-14
Filing date: 1993-07-13
Publication date: 1994-02-23
Anticipated expiration: 2013-07-13
Also published as: JPH06217260A; CN1032108C; KR940003363A; KR970010486B1; JP2721110B2

Abstract

Video signal reproducing apparatus proposed by the invention replay signal interrupt or the vision signal of being reset in can curb the vision signal (video blanking) that obtains from recording medium when excessive noise is arranged and export a width of cloth background images, be presented on the indicator screen.When display mode resembles mode switch to the stop/pause pattern from putting, produce a reset signal, background image generator (20) is resetted, so just can during mode switch, prevent the phenomenon that the temporary field of image collapses.

Description

Video signal reproducing apparatus

The present invention is relevant with the video signal reproducing apparatus of the vision signal of playback of recorded on recording medium.Specifically, the present invention releases a kind of video signal reproducing apparatus, when the video signal interruption that will reset, or when wherein having the too high noise of level, this video signal reproducing apparatus can curb the vision signal (being video blanking) of resetting from recording medium, and export a background colour, be presented on the screen of display.

Usually, in video tape recorder, during the clear band on the playback tape (promptly not recording the part that goes up signal as yet), audio frequency and/or video noise can occur on television screen or the monitor scope, this noise like also can produce when videotape is bad.

In addition, with in the LDP of CD as recording medium, when the transducer at playback of video signal on the optical track moves to when continuing to reset the vision signal of record on this new optical track on another optical track, on screen noise can appear.Moreover, when transducer is crossed the guiding area of the information of not recording, owing to there is not signal to import by transducer, therefore a large amount of noises just appears on screen.

In order to address these problems, released various devices already, make in signal interruption, recording medium damage.Under optical track leap or the like the situation, can prevent because the no record signal produces noise by transducer and shows on screen.

For example, in signal interruption or during crossing over optical track, what export to screen display is not the vision signal of normal playback from the recording medium, but shows the vision signal of some characters and/or image.Can during playback of video signal from recording medium, be that unit is stored in the vision signal of resetting in the video memory constantly also with frame or field.Like this, when not resetting normal vision signal, be not that the playback of video signal is exported demonstration from the recording medium just, but repeatedly output be stored in the video memory those frames or, noise can not appear therefore on screen.

Fig. 1 is the block diagram with video signal reproducing apparatus of above-mentioned performance, and this video signal reproducing apparatus as recording medium, can switch to the operation of playback background images with CD from the operation of playback CD.When not resetting or can not playback of recorded during normal video signal on CD, this video signal reproducing apparatus background colour vision signal of just resetting.

Among Fig. 1, mark mark 1 mark be the CD enlarger, the 2nd, background images generator, the 3rd, change over switch, the 4th, video signal preprocessor, the 5th, controller, the 6th, mode selector, and 7 are televimonitors.

Playback of video signal from CD enlarger 1 obtains by mode conversion switch 3, is added to video signal preprocessor 4, converts analog signal to after handling, and delivers to televimonitor 7.

During normal playback (promptly generally said " put and resemble " pattern), for the background images of resetting, when an indication resembles mode switch to the mode select signal of stop/pause pattern during from mode selector 6 input controllers 5 from normally putting, controller 5 just is added to change over switch 3 with a switching signal, makes change over switch 3 select the output signal of background images generators 2 to replace output signal from optical disk data reproducing.Therefore, when not when CD is reset normal vision signal, video signal preprocessor 4 is handled to be the background images signal, therefore demonstrates background images on the screen of televimonitor 7, and video noise can not occur.

Fig. 2 A-2E shows the waveform of each point in traditional video signal reproducing apparatus shown in Figure 1.Wherein, Fig. 2 A illustrates the mode of operation of LDP 1, Fig. 2 B is the switching signal that slave controller 5 is added to change over switch 3, Fig. 2 C is the vertical synchronizing signal that produces background images generator 2 outputs of background images, Fig. 2 D is change over switch 3 selected optical disk data reproducing signal or background images replay signal, also be that Fig. 2 E then shows the output situation of televimonitor 7 from the signal of video signal preprocessor 4 outputs.

When receive from mode selector 6 send display mode is resembled mode switch to the mode select signal that stops/fixing tentatively pattern (Fig. 2 A) from normally putting the time, controller 5 is added to change over switch 3 with switching signal (Fig. 2 B) immediately.Because mode select signal (Fig. 2 A) arbitrarily provides, therefore added switching signal (Fig. 2 B) is irrelevant with the vertical synchronizing signal (Fig. 2 C) of background images generator 2 outputs, that is to say that the vertical synchronizing signal of switching signal and background images generator 2 is asynchronous.Like this, before next trailing edge appearred in the vertical synchronizing signal of background images generator 2, switching signal (Fig. 2 B) had been " low " level of playback background images.This just causes temporary of image to collapse, and occurs excessive noise on the screen, shown in Fig. 2 E.

As mentioned above, in traditional video signal reproducing apparatus, the mode select signal (Fig. 2 A) that is added to controller 5 from mode selector 6 is random, and irrelevant with the vertical synchronizing signal (Fig. 2 C) of figure viewed from behind picture generator 2.Therefore, much noise can occur on screen during the mode switch, this is like a hen on a hot girdle for eyes.

The purpose of this invention is to provide a kind of video signal reproducing apparatus that addresses the above problem, this video signal reproducing apparatus can prevent temporary image field and collapse when mode of operation resembles mode switch to stop/pause pattern (thereby making the recording medium replay pattern change into the background images replay mode) from normally putting.In this video signal reproducing apparatus, the switching signal that is added to change over switch according to slave controller produces a reset signal, and this reset signal is added to the background images generator, makes the background images generator is resetted.

In order to achieve the above object, provided by the present inventionly show from the vision signal of recording medium replay selectively or show that the video signal reproducing apparatus of the vision signal that is produced by inside comprises:

Mode selector is used for selecting normally to put the pattern of elephant or stop/pause pattern;

The background images generation device is used for mode selector mode of operation being produced a width of cloth background images from normally putting when the pattern of elephant is reelected to the stop/pause pattern;

Transfer switch unit, a vision signal or the background images signal from the output of background images generation device from recording medium replay are used for transferring;

Control device is used for detecting from the mode select signal of mode selector output with a switching signal and is added on the transfer switch unit; And

Reseting signal generating device is used for producing a reset signal and this reset signal being added on the background images generation device according to be added to switching signal on the transfer switch unit from control device.

By below in conjunction with accompanying drawing to a DETAILED DESCRIPTION OF THE PREFERRED, can more be clear that above-mentioned purpose of the present invention and advantage.In these accompanying drawings:

Fig. 1 is the block diagram of traditional video signal reproducing apparatus;

Fig. 2 A-2E is the signal waveforms of each point in traditional video signal reproducing apparatus shown in Figure 1;

Fig. 3 is the block diagram of video signal reproducing apparatus proposed by the invention;

Fig. 4 A-4F is the signal waveforms of each point in the video signal reproducing apparatus shown in Figure 3;

Fig. 5 is the circuit diagram of an embodiment of reset signal generator among Fig. 3; And

Fig. 6 A-6E is the signal waveforms of each point in the reset signal generator shown in Figure 5;

Below with reference to accompanying drawing one embodiment of the present of invention are elaborated.

Fig. 3 is the block diagram of an embodiment of video signal reproducing apparatus proposed by the invention, and this is an example that is used for the CD enlarger.

By this block diagram of Fig. 3 as seen, this video signal reproducing apparatus comprises: a user is used for selecting the mode selector 60 of mode of operation (normally putting the pattern of elephant or stop/pause pattern), one according to the change over switch of mode select signal control of mode selector 60 outputs and the controller 50 of reset signal generator, a background images generator 20 that produces background images, generation makes the reset signal generator 80 of the reset signal that background images generator 20 resets, switching and the output optical disk data reproducing vision signal from CD enlarger 10 or the change over switch 30 of the background images signal that produces from background images generator 20, processing is from the video signal preprocessor 40 of the vision signal of change over switch 30 outputs, and demonstration is from the televimonitor 70 of the signal of video signal preprocessor 40 outputs.

Fig. 4 A-4F shows the oscillogram of each point in video signal reproducing apparatus shown in Figure 3 respectively, and wherein Fig. 4 A-4E is corresponding with the difference shown in Fig. 2 A-2E, and Fig. 4 F is added to reset signal on the background images generator 20 from reset signal generator 80.

Fig. 5 is the circuit diagram that an embodiment of reset signal generator 80 among Fig. 3 is shown, comprising first, second 81,82 and logic ORs of d type flip flop (OR) door 83.

Fig. 6 A-6E is respectively the signal waveforms of each point in the reset signal generator 80 shown in Figure 5.Wherein: Fig. 6 A is the clock signal that is added on the clock end of first d type flip flop 81 and second d type flip flop 82, Fig. 6 B is the switching signal that is added on the data input pin of first d type flip flop 81, Fig. 6 C is the Q output signal of first d type flip flop 81, Fig. 6 D is the Q output signal of second d type flip flop 82, and Fig. 6 E then is the output signal of logic sum gate 83.

The working condition of video signal reproducing apparatus of the present invention is described below in conjunction with Fig. 3 to Fig. 6.

CD enlarger 10 has a CD, a spindle drive motor driver and a transducer.10 outputs of CD enlarger are from vision signal and the level and the vertical synchronizing signal of optical disk data reproducing.

Background images generator 20 output background colour signal and level and vertical synchronizing signals.

Video signal preprocessor 40 is by change over switch 30 or receive the vision signal of resetting from the CD of CD enlarger 10, perhaps receives the vision signal that is produced by background images generator 20, and exports an analog signal of passing through some processing.

The user can have to select operating state with mode selector 60.If select normally to put the pattern of elephant, what then show on televimonitor 70 is the vision signal of resetting from recording medium, if select the stop/pause pattern, what then show on televimonitor 70 is the background images of exporting from background images generator 20.The formed mode select signal of model selection is added to controller 50.

Controller 50 for example can be a microcomputer.50 pairs of mode select signals from mode selector 60 inputs of controller detect, and then switching signal are added to change over switch 30, the signal converting in the control transformation switch 30.

Reset signal generator 80 detects the switching signal that slave controllers 50 are added to change over switch 30, produces one and is added to background image generator 20 with the synchronous reset signal of switching signal trailing edge.Therefore, reset signal generator 80 makes from the vertical synchronizing signal (Vsgnc) of background images generator 20 outputs synchronous with switching signal.

As seen from Figure 3, normally put resemble during, the vision signal (Fig. 4 A) of resetting from CD enlarger 10 is added to televimonitor 70 by change over switch 30 incoming video signal processors 40 after the signal processing of routine.If select the stop/pause patterns background images of resetting with mode selector 60 during resembling normally putting, then detector 50 detects and produces switching signal immediately after this situation and be added on the change over switch 30.At this moment, reset signal generator 80 detects switching signal, thereby reset signal is added on the background images generator 20, makes from the vertical synchronizing signal of background images generator 20 outputs to reset.Because pattern resets once the conversion background images at once, therefore just can during mode switch, prevent temporary of image and collapse.

That is to say, when mode of operation from normally put the pattern of elephant change into stop/when fixing tentatively pattern, in a single day the switching signal of Fig. 4 B becomes " low " level, just produces reset signal immediately, makes background images generator 20 initialization (resetting).Combine sample, during mode switch, output be a stable background images, temporary of image can not take place to be collapsed.

Be briefly described the working condition of reset signal generator 80 below in conjunction with Fig. 5 and Fig. 6.

The clock signal of Fig. 6 A is added to the clock end of first d type flip flop 81 and second d type flip flop 82.The switching signal (Fig. 6 B) that slave controller 50 is added to change over switch 30 is input to the data terminal of first d type flip flop 81.Fig. 6 C shows the Q output signal of first d type flip flop 81, and this signal is added on the input of the data terminal of second d type flip flop 82 and logic sum gate 83 simultaneously.Another input of logic sum gate 83 then receives the Q output signal of second d type flip flop 82 shown in Fig. 6 D.All be added with total clear (MR) signal on the reset terminal of first, second d type flip flop 81,82.Total clear signal produces when just powering in system, is used for to system initialization.

If added the clock signal of Fig. 6 A, be added to second d type flip flop 82 and logic sum gate 83 after then being input to the delay first of switching signal (Fig. 6 B) through first d type flip flop 81 of first d type flip flop 81.After this, under the effect of clock signal, the signal that is input to second d type flip flop 82 is exported through the Q output by second d type flip flop 82 after the delay of second d type flip flop 82 again.The Q output signal (Fig. 6 C) of first d type flip flop 81 that 83 pairs of logic sum gates are imported and the Q output signal (Fig. 6 D) of second d type flip flop are carried out the logic OR computing, thus the reset signal of obtaining (Fig. 6 E).

As mentioned above, video signal reproducing apparatus proposed by the invention has avoided when can not get the normal playback signal from recording medium screen the phenomenon of undesirable noise to occur.According to the present invention, when the vision signal that the mode of operation of video signal reproducing apparatus is write down from the normal playback recording medium as the user converts to and forms a width of cloth background images, in order to prevent that occurring temporary of image during mode switch collapses, by producing a reset signal with the mode switch signal, figure viewed from behind image generator is resetted, thereby figure viewed from behind image is synchronous with mode switch.Therefore, on screen, demonstrate stable figure viewed from behind image, prevented from during mode switch, to take place the phenomenon that the temporary field of displayed image collapses.

Claims

1, a kind of video signal reproducing apparatus is characterized in that this video signal reproducing apparatus comprises:

The background images generation device is used for described mode selector mode of operation being produced a width of cloth background images from normally putting to resemble when mode reformation is the stop/pause pattern;

Transfer switch unit is used for transferring from the vision signal of recording medium replay or the background images signal of exporting from described background images generation device;

Control device is used for detecting one and is added to described transfer switch unit from the mode select signal of described mode selector output with a switching signal; And

Reseting signal generating device is used for producing a reset signal and described reset signal being added to described background images generation device according to the described switching signal that is added to described transfer switch unit from described control device.

2, the video signal reproducing apparatus as being proposed in claim 1 is characterized in that wherein said reseting signal generating device comprises:

First deferred mount (81) is used for receiving from the described switching signal of described control device output with described switching signal one period first scheduled time of delay;

Second deferred mount (82) is used for receiving output signal of described first deferred mount (81) and the described output signal of described first deferred mount (81) is postponed one period second scheduled time; And

Output device (83) is used for an output signal of described first deferred mount (81) and a reversed-phase output signal of described second deferred mount (82) are carried out disjunction operation, thereby exports described reset signal.