CN1222734A - Method and device for superimposing additional information on video signal - Google Patents
Method and device for superimposing additional information on video signal Download PDFInfo
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- CN1222734A CN1222734A CN98119939A CN98119939A CN1222734A CN 1222734 A CN1222734 A CN 1222734A CN 98119939 A CN98119939 A CN 98119939A CN 98119939 A CN98119939 A CN 98119939A CN 1222734 A CN1222734 A CN 1222734A
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Abstract
An additional information signal is superimposed on a video signal at a very low level so that it does not stand out on the reproduced image. Spectral spreading code sequences are generated corresponding to different predetermined parts of the video signal. Bit information signals of the additional information signal made up of plural bits are spectrally spread by the spreading codes to generate spectrally spread bit information signals corresponding to the plural bits. The spectrally spread bit information signals are superimposed on corresponding different predetermined parts of the video signal. Because high priority bit information signals of the spectrally spread additional information signal are superimposed on high priority parts of the video signal, high priority information in the additional information can be protected even if the video signal is modified.
Description
The present invention relates to the image that reappears is produced the method and apparatus of extremely low level superimposing additional information on vision signal of as far as possible little influence.
Be used for the equipment of digital-information recording, for example digital VTR and MD (minidisk) recording played machine just are widely used, and DVD (digital video disks or the digital versatile disk [Sony]) equipment of writing function occurred having.
In these digital information recording devices, various additional information signals can be recorded with main video and audio signal or computer data etc.In this case, additional information signal be recorded in a district different with digital information signal zone or on digital signal, for example be increased to the title in every blocks of data or TOC (contents table) zone.
An additional information is by being superimposed upon in the system that sends on the conventional main video signal, and additional information signal is not directly to be superimposed upon on the digital information signal of title for example, but is recorded in a zone indirectly.
Additional information signal therefore can be easily by filtering or alter and remove, so then write down and playback apparatus no longer can detect essential additional information signal.
Especially, when increasing control information and copyright information and prevent bootlegging, because the removal of additional information signal can't reach its initial purpose as additional information signal.
And, if additional information signal is increased to a zone indirectly, when digital information signal transforms to simulating signal, can only obtain main information signal, additional information signal will be lost.
This means that even increase an anti-reproduced control signal as additional information signal, to prevent bootlegging, when signal transformation was simulating signal, this method was fully invalid.
Lose this problem in order to solve when signal transformation is simulating signal additional information signal, the inventor has proposed a kind of method, in this method, on frequency spectrum, expand additional information signal, for example anti-reproducing signals is then will be on the additional information signal of expanding on the frequency spectrum is added to vision signal (U.S. Patent application No.08/75510) during numeral or the analog record.
In this method, for example, carry out spread spectrum by producing the code (hereinafter being referred to as the PN sign indicating number) of a PN (pseudo noise) sequence with sufficiently high speed and providing it to additional information signal.Thereby for example arrowband, the anti-reproduced control signal of high level are transformed into broadband, the utmost point low level signal that vision signal is not had influence with additional information signal.
Then, the additional information signal of spread spectrum will have been carried out by this way, i.e. be added to analog video signal and being recorded on the recording medium of spread spectrum signal.
The vision signal that is recorded on the recording medium can be simulated, and also can be digital.
In this method, come the superimposing additional information signal with timing identical and frequency, for example anti-reproduced control signal with vision signal.Therefore, for the people that bootlegging is carried out in hope, the anti-reproduced control signal of removing stack from vision signal is very difficult.
Yet,, still can detect additional information signal, for example Die Jia anti-reproduced control signal by carrying out contrary expansion.
Be detected easily when considering when additional information is added to vision signal as spread spectrum signal on, can carry out spread spectrum with the synchronous extended code of the synchronizing signal of vision signal to preamble bit with one, to produce a spread spectrum signal, on the vision signal that then this spread spectrum signal is added to.
If produce extended code synchronously, in the time will detecting additional information, only need to produce an extended code that is used to carry out contrary expansion synchronously with the synchronizing signal of vision signal with vision signal.When signal was applied, the synchronous contrary extended code of generation and extended code was very simple, so can carry out detection at an easy rate.
For example, can use one has with the extended code of synchronous field duration of the vertical synchronizing signal of vision signal additional information is carried out spread spectrum.
In order easily it to be detected when additional information comprises a plurality of, and use the characteristic of spread spectrum technology, every position information in a plurality of positions can be carried out spread spectrum by different extended code sequences.For example, CGMS (duplicate and produce management system) is a kind of known anti-reproduced control signal.In CGMS, anti-reproduced control signal comprises two information: 00 allows unconfined duplicating, and 10 allow the first generation to duplicate, and 11 forbid duplicating.
When superposeing these two information synchronously with above-mentioned spread spectrum technology and vision signal, high-order information is carried out spread spectrum with the first extended code sequence, low level information is carried out spread spectrum with the second extended code sequence, and the spread spectrum signal with two sequences is superimposed upon on the vision signal simultaneously then.
In the spread spectrum technology, Die Jia two additional informations can detect by the contrary expansion of the first and second synchronous extended code sequences of execution and image synchronous signal as mentioned above.
Yet when a plurality of the different extended code sequences of usefulness were carried out spread spectrum and all are superimposed upon on the vision signal, though each is to superpose with extremely low level, they lumped together and have formed a part that has high level.Therefore, in this part, the additional information of stack may influence the image of reproduction, causes reappearing the reduction of visual S/N.
Therefore, the someone proposes by the spread spectrum signal of using different a plurality of acquisitions of the extended code sequence extension All Ranges of a screen that should not be added to, but is superimposed upon on the zone that does not hinder screen viewing, for example the left side or the right.
Yet, when the spread spectrum signal that obtains from preamble bit focuses on fixed part of screen, if, then might can not detect additional information signal in order to make anti-reproduced control signal invalid and vertical synchronizing signal and synchronization timing that change vision signal have deviation.
Especially, under the situation of CGMS, low level is [1], and if do not detect this low level, then no longer can prevent to duplicate.
Under the situation of CGMS, even a high position is [1], also can not distinguishes and forbid or allow duplicating, and if low level is [1], then show to forbid duplicating.
In other words, under the situation of CGMS, low level has high right of priority, if this high priority information bit has been lost, then can not prevent from effectively to duplicate.
Consider the problems referred to above, therefore the present invention aims to provide a kind of influence to vision signal method and apparatus of the significant bits of superimposing additional information (important bit) thereon as small as possible, even and make that additional information can not lost yet when attempting the illegal modifications vision signal.
Of the present invention on vision signal in the method and apparatus of superimposing additional information signal, with the synchronizing signal of vision signal synchronously is the different predetermined portions generation extended code sequences of vision signal, the position information signal that comprises a plurality of additional information signal carries out spread spectrum by these extended code sequences, producing spread spectrum position information signal, and spread spectrum position information signal is added on the corresponding different predetermined portions of vision signal corresponding to a plurality of.
According to the present invention,, can protect the high priority information in the additional information like this with the be added to high priority part of vision signal of the position information signal of the relative high priority of spread spectrum additional information signal.
Fig. 1 is the block scheme according to an embodiment of additional information superimpose device of the present invention.
Fig. 2 is used for illustrating the synoptic diagram at the additional information overlay model of additional information stacking method according to the present invention.
Fig. 3 has shown an example of the part-structure of equipment among Fig. 1.
Fig. 4 A to 4I has shown the sequential chart that is used to illustrate according to an embodiment of superimposing additional information method of the present invention.
Fig. 5 has shown an example of the part-structure of equipment among Fig. 1.
Fig. 6 has shown an example of the part-structure of equipment among Fig. 1.
Fig. 7 A to 7D has shown the relation between the stack level of information signal and spread spectrum signal.
Fig. 8 has shown and has had an example that is used to detect with the equipment of the detecting unit of the additional information of stacking method stack of the present invention.
Fig. 9 has shown an example of the part-structure of equipment among Fig. 8.
Figure 10 is the synoptic diagram that is used for illustrating according to the additional information overlay model of another embodiment of additional information stacking method of the present invention.
Figure 11 is the synoptic diagram that is used for illustrating according to the additional information overlay model of another embodiment of additional information stacking method of the present invention.
Explanation is according to some optimised forms that are used for the method and apparatus of superimposing additional information on vision signal of the present invention below with reference to the accompanying drawings.
Among Shuo Ming the embodiment, the present invention applies to a system below, in this system, will for example to offer a DVD register from the simulation outputting video signal of a DVD player from image output device in order duplicating, and to control this and duplicate.
In other words, in this example, the additional information that superpose is an anti-reproduced control signal.
Anti-reproduced control signal in this embodiment is exactly aforesaid two additional informations.Two additional informations of CGMS are added in each with the synchronous extended code of the vertical synchronizing signal of vision signal by one, and determine superposed positions according to the corresponding right of priority of these two information.
In the following description, the be added to centre position of horizontal direction on the screen of the low level in two additional informations of CGMS with higher-priority, shown in the lattice point of Fig. 1, and the left side or the right on the horizontal direction of the high-order screen that is added to.
For example, if someone attempts to carry out bootlegging, changed the phase place of the vertical synchronizing signal of vision signal, since on the left side of screen or the vision signal on the right not as the effective video signal area, the additional information that then is superimposed upon on this part will be removed effectively, thereby obviously can not detect.
Yet if additional information is the center section at screen, even changed the phase place of vertical synchronizing signal, this rough sledding can not take place yet.
In this system, in DVD player,, export and offer the DVD register with being added on the simulation outputting video signal through the anti-copy control information of spread spectrum.
In the DVD register, detect the anti-copy control information that is superimposed upon the spread spectrum on the simulation outputting video signal, and duplicate control according to detecting the output execution from DVD player.
According to the present invention, the method for superimposing additional information is applied to the stack of the spread spectrum signal in the DVD player, this spread spectrum signal is an additional information signal.
The DVD player that anti-copy control information is carried out spread spectrum and stack at first is described.
Anti-reproduced control signal is two a additional information, and by single extended code expansion, the high position of this information is not carried out spread spectrum with low level by different extended code sequences for it.
In the following embodiments, the spread spectrum sign indicating number is added on the brightness signal Y of vision signal, and is not superimposed upon on the colour signal C.
It can certainly be superimposed upon on the colour signal C.Yet, the colour signal of vision signal by two phase shaft components for example colour difference signal send, and reappear this colourity by the phase place of these two axles.Therefore, if spread spectrum signal is added on this colour signal,, colourity is changed, so this signal is apparent in view comparatively speaking even the level of this superposed signal is very low.Therefore the stack spread spectrum signal is very difficult under the situation that does not influence colourity.
According to this embodiment, spread spectrum signal only is superimposed upon on the luminance signal, but for the purpose of simplifying the description, will uses term " vision signal ", and brightness signal Y and colour signal C are not distinguished.
In Fig. 2, with the anti-reproduced control signal of CGSM with digitized video and audio signal recording on disk 100, disk 100 is DVD in this example.
The anti-reproduced control signal of CGSM can be recorded on the magnetic track zone of the inside of disk 100 or outmost TOC of being called (contents table) or catalogue, perhaps be recorded in the magnetic track that is inserted in recorded image-data and voice data another recording areas or on.
Following Example has illustrated latter event, wherein, when reading pictorial data, also reads anti-reproduced control signal simultaneously.
The player of this example comprises sensing element 11, decoding unit 12, D/A translation circuit 13, superpositing unit 14, anti-reproduced control signal extraction unit 15, (SS is the abbreviation of spread spectrum to SS additional information generation unit 16, down with), synchronous separating unit 17, PN produces control module 18 and the stack level is provided with unit 19, as shown in Figure 2.
D/A translation circuit 13 is transformed to digital video signal the analog video signal S3 that comprises a synchronous signal.This signal is offered synchronous separating unit 17 and superpositing unit 14.
The anti-reproduced control signal S4 that anti-reproduced control signal extraction unit 15 will be added on the video signal components S2 of reproduction extracts, and provides it to SS additional information generation unit 16.
PN produces control module 18 and adopts horizontal-drive signal H and vertical synchronizing signal V as the reference signal, produce the PN that shows the interval that produces two kinds of PN sign indicating number PNa, PNb and produce permission signal ENa, ENb, show that the PN sign indicating number produces the PN sign indicating number that picks up counting reset timing signal RE (hereinafter being abbreviated as reset signal RE) and PN clock signal PNCLK.
Fig. 3 is the block scheme that explanation PN produces a specific examples of control module 18.As shown in Figure 3, according to the present invention, PN produces PN clock generating unit 182 and the timing signal generation unit 183 that control module 18 comprises PN generation timing signal generation unit 181, comprises a PLL.
Horizontal-drive signal H and vertical synchronizing signal V from synchronous separating unit 17 offer PN generation timing signal generation unit 181 and timing signal generation unit 183.Horizontal-drive signal H from synchronous separating unit 17 offers PN clock generating unit 182.
PN produces timing signal generation unit 181 and uses vertical synchronizing signal V (Fig. 4 A) as a reference, produces the reset signal RE of a vertical cycle, shown in Fig. 4 B, is identified for the repetition period of the PN sign indicating number sequence of spread spectrum.
In this example, reset signal RE is the signal with vertical cycle, its level in the front of vertical synchronizing signal V along decline.
In this example, PN produces timing signal generation unit 181 application level synchronizing signal H (Fig. 4 C) and produces PN generation permission signal ENa (Fig. 4 D) and ENb (Fig. 4 E).
Also in this example, PN generation permission signal ENa, ENb are low useful signals, be low level but PN produces permission signal ENa two ends in the horizontal direction, and PN generation permission signal ENb centre in the horizontal direction are a low level.
PN clock generating unit 182 is used PLL, and to produce, cycle synchronous with horizontal-drive signal H be the PN clock PNCLK of clock BL.
This PN clock PNCLK determines chip (chip) cycle of extended code.
Timing signal generation unit 183 is created in the various timing signals of using in the equipment of Fig. 1 based on vertical synchronizing signal V and horizontal-drive signal H.
To produce the PN generation that produces in the control module 18 at PN allows signal ENa, ENb, PN sign indicating number reset signal RE and PN clock signal PNCLK to offer SS additional information generation unit 16.
Fig. 5 has shown an object lesson of the structure of SS additional information generation unit 16, and this unit comprises anti-161, two PN generation units of reproduced control signal allocation units 162,163, is used for the multiplier 164,165 and the on-off circuit 166 of spread spectrum.
Anti-reproducing signals allocation units 161 are divided into a high position and low level with two information of CGMS, and are synchronous with the generation timing of PN sign indicating number PNa, PNb, and a high position is offered multiplier 164, and low level is offered multiplier 165.
Because this purpose will allow signal ENa, ENb to offer anti-reproducing signals allocation units 161.In the generation interval of the PN sign indicating number sequence PNa that anti-reproducing signals allocation units 161 will illustrate hereinafter a high position is offered multiplier 164, in the generation interval of the PN sign indicating number sequence PNb that will illustrate hereinafter low level is offered multiplier 165 (Fig. 4 H).
That is, in this example, PN generation unit 162,163 is resetted in vertical cycle by reset signal RE, and produces PN sign indicating number PNa, the PNb of different predetermined sequences.
Because PN allows signal ENa, ENb, only PN generation unit 162,163 just produces PN sign indicating number sequence PNa, PNb according to clock signal PNCLK under PN sign indicating number generation enable state.
In this example, as mentioned above, when allowing signal ENa, when ENb is low level, allowing PN generation unit 162,163 to produce PN sign indicating number sequence PNa, PNb.Beginning and the end region of PN sign indicating number sequence PNa between horizontal zone produces, and shown in Fig. 4 E, and the zone line of PN sign indicating number sequence PNb between horizontal zone produces, shown in Fig. 4 G.
In this case, because PN generation unit 162,163 is not to reset between a vertical area, thus produce the interval different PN sign indicating number sequence PNa (1) that produces at PN, PNa (2) ... and PNb (1), PNb (2) ..., shown in Fig. 4 E and 4G.
But beginning PN generation unit between a vertical area 162,163 is resetted by reset signal RE, so all produce PN sign indicating number sequence PNa, PNb between each vertical area.
Fig. 6 has shown in the PN generation unit 162,163, for example structural drawing of PN generation unit 162.
The PN generation unit 162 of this example comprises 15 d type flip flop REG1-REG15, and these triggers have formed 15 grades of shift registers, also comprise XOR circuit EX-OR1-EX-OR3, is used to calculate suitable branch (tap) output of this shift register.
As mentioned above, the PN generation unit 162 shown in Fig. 5 is based on allowing signal ENa, PN clock signal PNCLK and the PN sign indicating number timing signal RE that resets to produce PN sign indicating number PNa.
Another PN generation unit 163 by from Fig. 6 different d type flip flop provide input signal to XOR circuit EX-OR1-EX-OR3, produce the PN sign indicating number sequence PNb different with PN sign indicating number sequence PNa.
As mentioned above, the PN sign indicating number sequence PNa of PN generation unit 162 generations offers multiplier 164.In this multiplier 164, the high position of the anti-reproduced control signal that synchronously sends out from the generation timing of anti-reproduced control signal allocation units 161 and this PN sign indicating number sequence PNa is carried out spread spectrum by PN sign indicating number sequence PNa, shown in Fig. 4 H.
This spread spectrum signal is offered an input end a of on-off circuit 166.
Similarly, the PN sign indicating number sequence PNb of PN generation unit 163 generations offers multiplier 165.In this multiplier 165, the high position of the anti-reproduced control signal that synchronously sends out from the generation timing of anti-reproduced control signal allocation units 161 and this PN sign indicating number sequence PNb is carried out spread spectrum by PN sign indicating number sequence PNb, shown in Fig. 4 H.
This spread spectrum signal is offered an input end b of on-off circuit 166.
In this example, switch 166 is by allowing signal ENb control, and the left side between a horizontal zone and the right domain transformation are to input end a, and the zone line between a horizontal zone transforms to input end b.
The result, in between each horizontal zone in the left side of screen and the zone, the right, from on-off circuit 166, the left side of screen and the right between each horizontal zone, obtain the spread spectrum signal of the high position of CGMS wherein by PN sign indicating number sequence PNa expansion, the zone line of screen between each horizontal zone obtains the spread spectrum signal of the low level of CGMS wherein by PN sign indicating number sequence PNb expansion, and wherein the low level of CGMS is a significant bits.
Be provided with in the unit 19 at the stack level, be one from the spread spectrum signal PS of this on-off circuit 166 and depend on chip (chip) value " 0 " of spread spectrum signal, the low-down signal of level of " 1 ", PS offers superpositing unit 14 with this spread spectrum signal.
Especially, the stack level is provided with unit 19 and carries out the D/A conversion, by this conversion the spread spectrum signal of numeral is transformed to simulating signal.
Under the situation of this example, the stack level is provided with unit 19 and exports an analog level according to the chip value of the anti-reproduced control signal of spread spectrum to superpositing unit 14, promptly, positive utmost point low level of output when the chip value of the anti-reproduced control signal of SS is " 0 ", negative utmost point low level of output when the chip value of the anti-reproduced control signal of SS is " 1 ".
Therefore, superpositing unit 14 has the function of stacking apparatus, and the anti-reproduced control signal of SS is added on the analog video signal S3, and wherein the anti-reproduced control signal of SS is the anti-reproduced control signal that has been carried out spread spectrum by PN sign indicating number sequence PS.
Fig. 7 A and 7B have shown in the relation between anti-reproduced control signal and the vision signal on the frequency spectrum.
Anti-reproduced control signal is the low bit speed rate signal that only comprises low-volume information, and is narrow band signal, shown in Fig. 7 A.
After having carried out spread spectrum, this signal has become broadband signal, shown in Fig. 7 B.
The level of spread spectrum signal descends with the inverse ratio of bandwidth expansion ratio rate.
This spread spectrum signal, promptly the anti-reproducing signals of SS is superimposed upon on the information signal by superpositing unit 14, and in this is handled, and the anti-reproducing signals of SS is that the also little level of dynamic range of vision signal of information signal superposes to liken to, shown in Fig. 7 C.
Thereby, almost can prevent the deterioration of the main information signal that causes owing to this stack fully.
Therefore, when the vision signal of the anti-reproduced control signal of SS that will superpose offered monitor and reappears this vision signal, the almost not influence of the anti-reproduced control signal of SS can obtain good reproduction image.
On the other hand, when carrying out contrary spread spectrum at record end when detecting the anti-reproduced control signal of SS, as described below, the anti-reproduced control signal of SS reverts to a narrow band signal, shown in Fig. 7 D.
By an enough big bandwidth expansion factor is provided, surpasses the power of information signal through the power of the contrary anti-reproducing signals of expanding, so can detect this anti-reproducing signals.
Because the anti-reproduced control signal of SS that is superimposed upon on the analog video signal has timing identical with analog video signal and frequency, so can not delete or revise by frequency filtering or simple information substitution.
Thereby the anti-reproduced control signal of SS that is superimposed upon on the vision signal can not be removed, and therefore must offer monitor and register.
Therefore, it is very difficult altering or removing anti-reproducing signals, necessarily like this can prevent that bootlegging is anti-and duplicates control.
In addition, according to said structure, use PN sign indicating number sequence and carry out spread spectrum based on vertical synchronizing signal with vertical cycle.Therefore, based on the signal synchronous, can easily produce the PN sign indicating number sequence that is used for detecting the required contrary spread spectrum of this spread spectrum signal from vision signal with the vertical synchronizing signal that goes out from video signal detection.
That is, needn't application examples such as the slip relevant device carry out the synchro control of the PN sign indicating number that is used for contrary expansion.
In addition, be in the zone line on the horizontal direction that can not be altered the too big screen that influences of vision signal by the significant bits that makes stack, more effectively carry out the anti-control of duplicating.
The SS that will superpose then prevents that the simulation outputting video signal of copy control information is provided to the monitor of displayed image on register 14, and this will describe below.
Then, the register that receives analog video signal and record from aforesaid DVD player will be described below.
Fig. 8 is the synoptic diagram that the video tape recorder (hereinafter referred is " register ") that uses in this system is described.
As shown in Figure 8, register comprises A/D translation circuit 21, scrambler 22, r/w cell 23, be used to detect the detecting unit 24 (referring to that hereinafter SS prevents the reproduced control signal detecting unit) that passes through spread spectrum and be superimposed upon the anti-reproducing signals on the vision signal, allow or forbid duplicating duplicate control module 25, synchronous separating unit 26, and PN produces control module 27.
Recording medium 200 is to be write the DVD of vision signal thereon by this register.
The analog video signal Vi that player provides is transformed into digital video signal S21 by A/D translation circuit 21, and offers coding unit 22, the anti-reproduced control signal detecting unit 24 of SS and synchronous separating unit 26.
Before decoding, synchronous separating unit 26 extracts horizontal-drive signal H and vertical synchronizing signal V from digital video signal S21, and the result is offered PN generation control module 27.
The PN of register produce control module 27 have with reference to the identical structure of the PN generation control module 18 of the player of figure 3 explanations.
Therefore, suppose that here PN generation control module 27 has structure same as shown in Figure 3 and describes.
The PN that PN produces control module 27 produces timing signal generation unit 181 by using vertical synchronizing signal V as the reference signal, generation provides the PN sign indicating number of the timing that resets of PN sign indicating number sequence PNa, the PNb timing signal RE (hereinafter referred is reset signal RE) that resets corresponding to above-mentioned player for contrary spread spectrum, and pass through application level synchronizing signal H as the reference signal, produce permission signal FNa, ENb corresponding to the permission signal in the player.
Here the reset signal RE of Chan Shenging is with produce the PN sign indicating number that produces in the control module 18 timing signal RE that resets at the PN of above-mentioned player identical.This signal provides the timing corresponding to reference position interior between the vertical area of vision signal.
The PN clock generating unit 182 that PN produces control module 27 produces and the synchronous PN clock signal PNCLK of horizontal-drive signal H.This clock signal PNCLK is a signal corresponding to the clock signal PNCLK that uses in the above-mentioned player.
In addition, the timing signal generation unit 183 of PN generation control module 27 produces various timing signals based on horizontal-drive signal H.
Produce the reset signal RE, permission signal ENa, ENb and the clock signal PNCLK that produce in the control module 27 at PN and offer PN generation unit 28.
Permission signal ENa, the ENb and the clock signal PNCLK that produce control module 27 from PN offer the anti-reproduced control signal detecting unit 24 of SS.
The anti-reproduced control signal detecting unit 24 of this SS has structure as shown in Figure 9.
Especially, the anti-reproduced control signal detecting unit 24 of SS has the identical respectively structure of two PN generation units 162,163 in the SS additional information generation unit 16 with player.It comprises that two produce identical PN sign indicating number sequence PNa, the PN generation unit 241,242 of PNb respectively, on-off circuit 243, contrary expansion multiplier 244, and position difference circuit 245.
In these cases, as shown in the figure, will produce reset signal RE, the PN clock signal PNCLK of control module 27 and allow signal ENa, ENb to offer PN generation unit 241,242 from PN.
As a result, produce respectively and synchronous PN sign indicating number sequence PNa, the PNb of the PN sign indicating number sequence that is used to expand that in SS additional information generation unit 16, produces, and offer multiplier 244 by on-off circuit 243 by PN generation unit 241,242.
On-off circuit 243 is by allowing signal ENb control, transforms to input end a (PNa end) in the left side of screen and the zone, the right between each horizontal zone, transforms to input end b (PNb end) in the zone line of screen between each horizontal zone.
As a result, will be provided to multiplier 244 with the complete synchronous PN sign indicating number sequence of the PN sign indicating number sequence of in SS additional information generation unit 16, using by on-off circuit 243.
In multiplier 244, carry out contrary spread spectrum, and recover two of anti-reproduced control signal.
Provide the discrimination unit 245 that puts in place with the output signal of this multiplier 244.Thereby distinguish two anti-reproduced control signal S24 of CGMS two additional informations of between in the horizontal direction the left side and the right and zone line, disperseing.
The anti-reproduced control signal S24 that obtains is like this offered anti-copied cells 25.
Anti-25 couples of anti-reproduced control signal S24 of copied cells decode, and determine to allow or forbid duplicating the vision signal that offers register.
Based on this difference result, produces a write control signal S25, and offer r/w cell 23, so that permission or forbid writing vision signal S22.
When write control signal S25 allows to write fashionable, r/w cell 23 writes vision signal S22 on recording medium 200, and forbids writing fashionable as write control signal S25, and r/w cell 23 does not write vision signal S22 on recording medium 200.
Therefore, recording unit among this embodiment is by using and the identical sign indicating number sequence of the used PN sign indicating number of spread spectrum sequence PS, on the vision signal of the anti-reproduced control signal of SS that superposeed, carry out contrary spread spectrum, extract the anti-reproduced control signal that is superimposed upon on the picture intelligence.
In this case, according to the right of priority of position two additional informations are disperseed, the position with higher-priority is superimposed upon and is not subjected to change on the position that vision signal influences (centre in the horizontal direction in the above example).Therefore, even the situation of vision signal occurred altering, can not lose significant bits yet.
Perhaps, the synchronous of PN sign indicating number can so need be used for the synchro control of the PN sign indicating number of contrary expansion, still owing to this synchro control at most only needs between a horizontal zone, so must detect significant bits with respect to the vertical synchronizing signal skew of vision signal.
In addition, in the above embodiments because each information bit adopted different PN sign indicating number sequences, think that each determines the superposed positions on vision signal, thereby can detect each.
According to the first above-mentioned embodiment, though disperseed the multidigit additional information, and significant bits accumulates in the centre of the horizontal direction of screen, is not significant bits to be gathered together by this way.
According to second embodiment, disperse the multidigit additional information fifty-fifty.
Figure 10 has shown the superpose situation of multidigit additional information according to second embodiment.In this case, when two additional informations of CGMS were added on the vision signal, screen area also was divided into a plurality of grids, and high information bit and low information bit alternately are superimposed upon on these grids, to form grid-like figure.In this figure, comprise that the spread spectrum signal of the low level of spread spectrum is superimposed upon in the grid that has lattice point.
In this second embodiment, also be to adopt for example aforesaid PN sign indicating number of no PN sign indicating number sequence sequence PNa respectively, PNb carries out spread spectrum to high-order and low level, so that the SS additional information signal that obtains to superpose in the mode identical with aforementioned first embodiment.
By producing PN sign indicating number sequence PNa respectively based on being provided to, the vertical synchronizing signal V of the PN generator of PNb and horizontal-drive signal H produce and allow signal ENa, ENb, produce the anti-reproduced control signal of the SS that is superimposed upon on the vision signal in the mode identical in essence, to obtain the figure among Figure 10 with first embodiment.Because the spread spectrum signal that on each grid discrete areas, only superposes, even the multidigit additional information is arranged, also be easy to, and can not influence reproduction image from vision signal with low-down level this signal that superposes.
Therefore information bit is dispersed on the screen widely, even revised screen message by altering, thereby may cause partial information to be lost, but information bit still can keep, thereby must extract additional information.
And, according to the dispersion pattern of significant bits,, can only carry out contrary expansion and detection to for example significant bits by producing the extended code of significant bits.
Figure 11 has shown the superposed positions according to the multidigit of the 3rd embodiment.According to the 3rd embodiment, when aforesaid two CGMS additional informations were superimposed upon on the vision signal, screen was divided into two parts in the horizontal direction, and as shown in figure 11, a high position specifies in right half of, and low level specifies in by the left side shown in the lattice point half of.
In this 3rd embodiment, a high position and low level are respectively by for example aforesaid PN sign indicating number sequence PNa, and PNb carries out spread spectrum, so that with the same in the situation of aforesaid first embodiment, obtain the SS additional information signal of stack.
By producing PN sign indicating number sequence PNa respectively based on being provided to, the vertical synchronizing signal V of the PN generator of PNb and horizontal-drive signal H produce and allow signal ENa, ENb, produce the anti-reproduced control signal of the SS that is superimposed upon on the vision signal in the mode identical in essence with first embodiment, so then first half-sum in the horizontal direction the second half is a low level.
In this 3rd embodiment, because at left one side of something of screen and right one side of something spread spectrum signal that only superposeed respectively, even the multidigit additional information is arranged, also be easy to low-down level this signal that superposes, and can not influence reproduction image from vision signal.
According to the 3rd embodiment,, make and have only significant bits to be detected by producing corresponding to the position extended code of the residing left area of significant bits and on these positions, carrying out contrary expansion.
According to the foregoing description, a screen is divided, of multidigit additional information is assigned to the zone that each marks off, and is superimposed upon on the vision signal.Yet the reset cycle of spread spectrum sign indicating number can not be a vertical cycle, but a plurality of vertical cycle, and the multidigit additional information is disperseed on direction in space and distributed.
For example, the important information position can be assigned to each of vision signal, every one, or a field in a plurality of.
In this case, need be at the reset signal RE in each unit, but can produce this reset signal RE at an easy rate by stack timing code or similar signal on vision signal.
Certainly, an information can not be to be superimposed upon in the field, but in a plurality of.
The reset cycle of extended code can be a horizontal cycle or a plurality of horizontal cycle.Under this situation, the multidigit additional information is dispersed in each unit of a horizontal cycle or a plurality of horizontal cycles, and determines their superposed positions according to right of priority.
In addition, the present invention also can take the array configuration of aforesaid first and second embodiment.
That is, each of multidigit additional information is superimposed upon on the distributed locations of vision signal, and important information is superimposed upon and is not subjected to alter on the position that vision signal influences.
In the foregoing embodiments, according to " 0 " or " 1 " of the chip of extended code, the level that superposes is set to plus or minus, but can a level be 0 level also, and another level is a plus or minus.
In addition, in aforesaid explanation, by spread spectrum and the additional information signal that is superimposed upon on the vision signal is an anti-reproduced control signal, but additional information is not limited in anti-reproduced control signal, for example, also can be about the information of digital video signal or be used to discern each timing code or copyright information etc.
For example, can use the sequence number of designated recorder equipment as copyright information.
If with the stack of this sequence number and be recorded on the digital video signal Vi, then be easy to follow the trail of and duplicate history.
In addition, should be appreciated that additional information is not limited to two, also can be three or multidigit more.
In above stated specification, spread spectrum signal is superimposed upon on the analog video signal, but can certainly be superimposed upon on the digital video signal, still can use the present invention in this case.
In addition, by specifying when the value of preamble bit is " 1 ", stack when preamble bit is " 0 ", does not superpose, thereby might superpose spread spectrum signal on vision signal corresponding to the PN sign indicating number of this sequence.
In addition, in the superincumbent explanation,, preamble bit is carried out spread spectrum by each being used different PN sign indicating number sequences, but also can be to all positions with a shared extended code.
And extended code is not limited to the PN sign indicating number, also can be other sign indicating number, for example gold codes.
In addition, the present invention also can apply to this situation, is not that additional information is carried out spread spectrum and stack, but superposes corresponding to the signal of each with low-down level on vision signal, reappears image and do not influence.
In addition, in above stated specification, the present invention applies to a record and playback system, but also can apply to following situation, and additional information is superimposed upon on the vision signal, and sends by medium in each, for example radiowave, cable or infrared radiation ripple.
Claims (12)
1, a kind of on vision signal the method for superimposing additional information signal, it is characterized in that:
With the synchronizing signal of vision signal synchronously is the different predetermined portions generation extended code sequences of described vision signal,
Utilize described extended code sequence that a position information signal that comprises a plurality of described additional information signal is carried out spread spectrum, producing corresponding to described a plurality of spread spectrum position information signal, and
Described spread spectrum position information signal is superimposed upon on the corresponding different predetermined portions of described vision signal.
2, as claimed in claim 1 on vision signal the method for superimposing additional information signal, it is characterized in that: described a plurality of positions of described additional information signal have different right of priority, and are superimposed upon on the high priority part of described vision signal corresponding to the described spread spectrum position information signal of high priority position.
3, as claimed in claim 2 on vision signal the method for superimposing additional information signal, it is characterized in that: the described spread spectrum position information signal corresponding to a plurality of high priority position of described additional information signal is superimposed upon on the part at the image middle part that is equivalent to described vision signal.
4, as claimed in claim 1 on vision signal the method for superimposing additional information signal, it is characterized in that: the described a plurality of position of described additional information signal has different right of priority, and is superimposed upon corresponding to the described spread spectrum position information signal of a plurality of high priority position of described additional information signal on the separating part of an image of described vision signal.
5, as claimed in claim 1 on vision signal the method for superimposing additional information signal, it is characterized in that: the described extended code sequence that produces for the different predetermined portions of described vision signal comprises different extended code sequences.
6, as claimed in claim 1 on vision signal the method for superimposing additional information signal, it is characterized in that: described additional information signal is to be used to control the anti-reproduced control signal that duplicate of described vision signal on a recording medium.
7, a kind of equipment that is used for superimposing additional information signal on vision signal comprises:
With the synchronizing signal of vision signal synchronously is the device of the different predetermined portions generation extended code sequences of described vision signal;
Utilize described extended code sequence to the position information signal that comprises a plurality of described additional information signal carry out spread spectrum, to produce device corresponding to described a plurality of spread spectrum position information signal; And
Be used for described spread spectrum position information signal is superimposed upon device on the corresponding different predetermined portions of described vision signal.
8, as claimed in claim 7 on vision signal the device of superimposing additional information signal, it is characterized in that: described a plurality of positions of described additional information signal have different right of priority, and described spread spectrum signal generation device application extension sign indicating number sequence, described extended code sequence are that the corresponding high priority relatively by the different predetermined portions that described a plurality of relative high priority position are assigned to described vision signal partly produces.
9, as claimed in claim 8 on vision signal the device of superimposing additional information signal, it is characterized in that: the relative high priority of the different predetermined portions of described vision signal partly is the part that is equivalent to the image middle part of described vision signal.
10, as claimed in claim 7 on vision signal the device of superimposing additional information signal, it is characterized in that: described a plurality of positions of described additional information signal have different right of priority, and described spread spectrum signal generation device application extension sign indicating number sequence, described extended code sequence are to assign to produce by the separated part that the relative high priority position with described multidigit is assigned to an image of described vision signal.
11, as claimed in claim 7 on vision signal the device of superimposing additional information signal, it is characterized in that: described spread spectrum signal generation device produces the extended code that comprises different extended code sequences corresponding to the different predetermined portions of described vision signal.
12, as claimed in claim 7 on vision signal the device of superimposing additional information signal, it is characterized in that: described additional information signal is to be used to control the anti-reproduced control signal that duplicate of described vision signal on a recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98119939A CN1222734A (en) | 1997-09-01 | 1998-08-31 | Method and device for superimposing additional information on video signal |
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| JP235787/97 | 1997-09-01 | ||
| CN98119939A CN1222734A (en) | 1997-09-01 | 1998-08-31 | Method and device for superimposing additional information on video signal |
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| CN1222734A true CN1222734A (en) | 1999-07-14 |
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| CN98119939A Pending CN1222734A (en) | 1997-09-01 | 1998-08-31 | Method and device for superimposing additional information on video signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112616030A (en) * | 2020-11-27 | 2021-04-06 | 西安诺瓦星云科技股份有限公司 | Image frame data processing method, device and system and display control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112616030A (en) * | 2020-11-27 | 2021-04-06 | 西安诺瓦星云科技股份有限公司 | Image frame data processing method, device and system and display control system |
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