CN204087787U - For the system of digital watermarking - Google Patents
For the system of digital watermarking Download PDFInfo
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Abstract
The utility model relates to the system for digital watermarking, and the sound signal being suitable for producing to signal source adds watermark.This system comprises: spectromodulator, is configured for the watermark bit of embedded audio signal and pseudo noise signal carrying out spectrum modulation to generate through modulation signal; Distortion controller, is coupled to signal source and spectromodulator, is configured for and carries out shaping according to sound signal to through modulation signal, with generate meet predetermined distortion constraints through reshaping signal; And interference inverter, be coupled to signal source and distortion controller, be configured for according to sound signal, pseudo noise signal and generate compensating signal through reshaping signal, wherein compensating signal is used for compensating audio signal to the interference of watermark decode.
Description
Technical field
The utility model relates generally to digital processing field, more specifically, relates to the system for digital watermarking.
Background technology
In recent years, digital watermark technology has been widely used in the field such as copyright protection, issuing control, consistency desired result, broadcast monitoring, image watermarking of multimedia digital signal.The basic thought of digital watermark technology is: in the digital multimedia signal of image, figure, audio frequency and/or video and so on, add the information being called watermark, to be used for various checking object in the future.It is in fact a kind of digital signature be hidden in main multi-media signal that watermark is filled, and provides the information such as entitlement or rights of using about main multi-media signal.
From extraction and the detection of digital watermarking, digital watermark technology can be divided into non-blind digital watermark, half-blindness digital watermark and blind watermatking technology.The reference signal (such as, pseudo noise sequence) that non-blind digital watermark needs original multi-media information when extracting and decode and adds; Half-blindness digital watermark needs reference signal and generates the key of this reference signal when extracting; Blind watermatking technology only needs key when extracting.
For in the digital watermark technology of audio frequency, the digital watermarking of modulating based on spread spectrum (Spread Spectrum, SS) is a kind of known blind watermatking technology.But the watermark traditionally based on SS only considers attack noise to the impact of watermark decode, and have ignored the interference of audio signal for watermark decode itself, this may cause increasing of the bit error rate.And in order to reduce the audible distortion that watermark causes to audio signal, watermark embedment side often carries out frequency spectrum processing to used reference signal.This makes to perform the digital watermarking demoder of blind check and is difficult to recover exactly the reference signal that watermark embedment side uses.In other words, there is reference signal mismatch between watermark embedment side and decoding side, which results in the reduction of decoding performance.
Therefore, a kind of Digital Audio Watermarking Techniques of more accurate and robust is needed in this area.
Utility model content
In order to solve the problems referred to above in this area and other problems, the utility model provides a kind of system and method for digital watermarking.
In one of the present utility model, provide a kind of system for digital watermarking, the sound signal being suitable for producing to signal source adds watermark.This system comprises: spectromodulator, is configured for the watermark bit of embedded audio signal and pseudo noise signal carrying out spectrum modulation to generate through modulation signal; Distortion controller, is coupled to signal source and spectromodulator, is configured for and carries out shaping according to sound signal to through modulation signal, with generate meet predetermined distortion constraints through reshaping signal; And interference inverter, be coupled to signal source and distortion controller, be configured for according to sound signal, pseudo noise signal and generate compensating signal through reshaping signal, wherein compensating signal is used for compensating audio signal to the interference of watermark decode.
According to some embodiment, this system comprises further: pseudo noise generator, is coupled to spectromodulator and interference inverter, is configured for and generates pseudo noise signal under cipher controlled, and pseudo noise signal is fed to spectromodulator and interference inverter.
According to some embodiment, distortion controller comprises: analysis filter, is configured for the spectral coefficient that will be transformed to through modulation signal in frequency domain; Frequency spectrum regulator, is coupled to analysis filter, is configured for and regulates frequency spectrum parameter according to distortion constraints; And synthesis filter, be coupled to frequency spectrum regulator, be configured for and the frequency spectrum parameter through regulating is switched back in time domain to generate through reshaping signal.
According to some embodiment, this system comprises further: modeling device, be coupled to signal source and distortion controller, be configured for generate based on psychoacoustic model and cover threshold value for sound signal, and threshold value will be covered be fed to and be fed to distortion controller as distortion constraints.
According to some embodiment, interference inverter comprises: interference computer, is configured for according to sound signal, pseudo noise signal and calculates signal projection to determine the interference value of sound signal to watermark decode through reshaping signal; And compensation maker, be coupled to interference computer, be configured for and generate compensating signal based on interference value with through modulation signal.
According to some embodiment, this system can be implemented as integrated circuit, special IC, field programmable gate array or SOC (system on a chip).
Accompanying drawing explanation
Read detailed description hereafter by reference to accompanying drawing, above-mentioned and other objects of the present utility model, feature and advantage will become easy to understand.In the accompanying drawings, show some embodiments of the present utility model by way of example, and not by way of limitation, wherein:
Fig. 1 shows the schematic block diagram of the system 100 for digital watermarking according to the utility model exemplary embodiment;
Fig. 2 shows the exemplary block diagram of the system 200 for digital watermarking according to another exemplary embodiment of the utility model; And
Fig. 3 shows the process flow diagram of the method 300 for digital watermarking according to the utility model exemplary embodiment.
In various figures, identical or corresponding label represents identical or corresponding part.
Embodiment
Generally, according to embodiment of the present utility model, in order to reduce audio signal as signal vehicle as much as possible for the interference of watermark decode, generate compensating signal in watermark embedment side so that this interference compensates.Thus, the bit error rate of watermark decode side can effectively be reduced.And, in order to overcome the adverse effect that watermark embedment side brings to watermark decode the distortion control treatment that reference signal is carried out, in embodiment of the present utility model, not only consider audio signal and original pseudo noise signal when generating above-mentioned compensating signal, but also include the pseudo noise signal through ovennodulation and shaping in consideration.In this way, can guarantee that the pseudo noise signal recovered in watermark decode side matches with embedding side, thus reduce the bit error rate of watermark decode further.
Some illustrative embodiments below with reference to the accompanying drawings describe principle of the present utility model and spirit.Should be appreciated that providing these embodiments is only used to enable those skilled in the art understand better and then realize the utility model, and not limit scope of the present utility model by any way.
Note that the term " coupling " used in the following description is for limiting the annexation between two parts.Such as, " components A is coupled to part B " refers to that components A to be connected with part B by any suitable mode or to communicate.Can unidirectional or bi-directional signal or data among each other through the components A of coupling and B." coupling " had both comprised direct-coupling (that is, there is not another parts C between components A and part B), also comprised indirect coupling (that is, components A is coupled to another parts C, parts C then be coupled to part B).
In addition, in the accompanying drawings, the line with sensing between parts is intended to expression information or the flow direction of signal between be coupled parts, the coupling scheme not by any way between limiting part.And in the following description, signal can be expressed as the form of vector, this is conventional in this area.
First with reference to figure 1, it illustrates the schematic block diagram of the system 100 for digital watermarking according to the utility model exemplary embodiment.
As shown in the figure, digital watermarking system 100 comprises spectromodulator 102.Spectromodulator 102 is configured for pseudo noise (pseudo noise, PN) signal (be designated as u) and will embedded audio signal (watermark bit be designated as x) (is designated as and b) carries out spectrum modulation, to generate through modulation signal (being designated as bu).
According to embodiment of the present utility model, sound signal x can be produced by any one or more signal sources (not being illustrated in FIG) suitably.Signal source can be an ingredient of system 100, and also can be the individual components independent of system 100, scope of the present utility model be unrestricted in this regard.
PN signal u can be such as the bit sequence with given number, and the mean value of the bit in this sequence is zero, and the value of each bit is+σ
uor-σ
u.PN signal can be generated under the control of the key by special PN maker.According to embodiment of the present utility model, PN maker can be a part for spectromodulator 102, and also can be the individual components be separated with it, scope of the present utility model be unrestricted in this regard.In this regard, hereinafter with reference to Fig. 2, an exemplary embodiment is described.
According to embodiment of the present utility model, spectromodulator 102 utilizes watermark bit b to modulate PN signal.Watermark bit b is the bipolar bit wanting embedded audio signal x, that is, its value equals+1 or-1.According to embodiment of the present utility model, watermark bit b can be generated by the parts in system 100, or is generated by the miscellaneous part independent of system 100, and scope of the present utility model is unrestricted in this regard.
According to some embodiment of the present utility model, spectromodulator 102 can realize band spectrum modulation, to generate through modulation signal bu by being multiplied with PN signal u by watermark bit b.Other embodiments are also that those skilled in the art can expect, scope of the present utility model is unrestricted in this regard.
What spectromodulator 102 generated is output to distortion controller 104 in system 100 to carry out distortion control through modulation signal bu.As shown in Figure 1, distortion controller 104 is coupled to the signal source (not being illustrated) and spectromodulator 102 that produce sound signal x.In operation, distortion controller 104 can receive from the sound signal x of signal source and from spectromodulator 102 through modulation signal bu.Distortion controller 104 is configured for and carries out shaping to described through modulation signal bu according to sound signal x, with generate meet predetermined distortion constraints (be designated as bu through reshaping signal
p).
Be appreciated that and adding after watermark to original audio signal x, will cause this audio frequency that distortion to a certain degree is acoustically occurring.Distortion controller 104 can by controlling this distortion within acceptable scope carrying out shaping through modulation signal bu.Specifically, distortion controller 104 based on the characteristic amendment of sound signal x and the spectrum signature adjusted through modulation signal bu, can make the signal bu after shaping
pfrequency spectrum and other acoustic characteristics meet predetermined constraint.In this way, the distortion of original audio signal caused by adding watermark can be controlled in user not easily to discover or in acceptable limit.
The known various method for covering distortion under constraint control in sound signal in this area.Such as, distortion constraints can be such as one group and covers threshold value.Cover threshold value to be generated by suitable mode, the empirical value of such as Corpus--based Method, artificial setting or generated by various acoustic model.Exemplarily, hereafter will describe in detail in the embodiment described at composition graphs 2 such as based on the mask of psychoacoustic model.Alternatively or additionally, the quantizing noise for the audio coder to coding audio signal also can as distortion constraints.Correspondingly, distortion controller 104 can carry out shaping to through modulation signal bu, makes generated through reshaping signal bu
ppower spectrum and the quantizing noise of audio coder be consistent.Thus, can ensure that the power of the watermark bit embedded is lower than sound signal itself.Note that several distortion constraints described here is only exemplary, any distortion constraints that is known or that develop in the future and corresponding distortion control method at present all can be combined with embodiment of the present utility model.
By distortion controller 104 generate through reshaping signal bu
pbe fed to interference inverter 106.As shown in Figure 1, the interference inverter 106 in system 100 is coupled to signal source (not being illustrated in Fig. 1) and distortion controller 104.In addition, interference inverter 106 can also receive PN signal u.According to embodiment of the present utility model, interference inverter 106 is configured for according to sound signal x, PN signal u with through reshaping signal bu
pgenerate compensating signal (to be designated as y).Generating band watermark audio signal as a result, (be designated as s), this compensating signal is used for the potential interference of compensating audio signal x to the watermark decode performed in watermark decode side in the future.
In traditional SS digital watermark, only consider to attack noise to the impact of watermark decode, do not solve the interference of audio signal to watermark decode itself.More specifically, in traditional SS digital watermark, consequential signal s is calculated as usually:
s＝x+bu
But in practice, audio signal is far better than attack noise usually.Therefore sound signal itself is to the interference of watermark decode dominance often.Moreover, owing to using the PN signal bu through ovennodulation and shaping in the process of adding watermark
p, therefore traditional SS digital watermark cannot eliminate the impact that frequency spectrum shaping brings to watermark decode.In other words, the reference signal recovered in watermark decode side is not mated with the reference signal that watermark embedment side uses.
For solving the problem, according to embodiment of the present utility model, in the compensating signal that interference inverter 106 generates, audio signal will be removed in watermark embedment side the interference of watermark decode.Such as, if audio signal this interference to watermark decode is expressed as x, then compensating signal may be calculated:
y＝xu
p。
Correspondingly, final signal s can calculate as follows:
s＝x+αbu
p-y＝x+αbu
p-xu
p＝x+(αb-x)u
p
Wherein α is the parameter controlling to embed distortion.In this way, the interference x that audio signal is brought to watermark decode obtains compensation in embedding side.In this way, the bit error rate of watermark decode side can effectively be reduced.
And, can see, when interference inverter 106 calculates audio signal interference x, not only will consider the characteristic of audio signal x and PN signal u, but also will through reshaping signal bu
pmaster signal component u
p(that is, bu
premaining component of signal after removing watermark bit b) include consideration in.In this way, the impact that the frequency spectrum shaping performed for distortion controls object brings to watermark decode also can effectively be compensated.Various suitable mode can be utilized to calculate interference value x, describe concrete example hereinafter with reference to Fig. 2.
With reference now to Fig. 2, it illustrates the exemplary block diagram of the system 200 for digital watermarking according to another exemplary embodiment of the utility model.Be appreciated that system 200 can be considered to a concrete example of the system 100 described with reference to figure 1 above.
As shown in Figure 2, system 200 comprises pseudo noise generator 201, and it is coupled to spectromodulator 202 and interference inverter 206 (more particularly, the interference computer 2061 in interference inverter 206, hereafter describes in detail).In operation, pseudo noise generator 201 can generate pseudo noise signal u under the control of a key k, and the pseudo noise signal u of generation is fed to spectromodulator 202 and interference inverter 206.Pseudo noise generator 201 can generate pseudo noise signal according to any mode that is known or exploitation in the future at present, and scope of the present utility model is unrestricted in this regard.
System 200 also comprises spectromodulator 202, and it corresponds to the spectromodulator 102 in system 100.As shown in the figure, spectrum controller is coupled with pseudo noise generator 201, and is configured for the pseudo noise signal u receiving and generated by pseudo noise generator 201.Then, spectromodulator 202 couples of pseudo noise signal u modulate to generate through modulation signal bu with the watermark bit b that will embed.According to embodiment of the present utility model, spectromodulator 202 can by the modulation that has been multiplied with watermark bit b by pseudo noise signal u.Other modes are also feasible certainly, and scope of the present utility model is unrestricted in this regard.
The distortion controller 204 be fed to through modulation signal bu in system 200 generated by spectromodulator 202, it corresponds to the distortion controller 104 in system 100.Especially, in the embodiment shown in Figure 2, distortion controller 204 comprises analysis filter 2041, and it is configured for the one group of spectral coefficient be converted to through modulation signal bu in frequency domain generated by spectrum controller 202.The conversion of this frequency domain such as can realize based on Fast Fourier Transform (FFT) (FFT).Those skilled in the art easily can also expect other suitable modes, and scope of the present utility model is unrestricted in this regard.
The spectrum systems that analysis filter 2041 is converted to is fed to the frequency spectrum regulator 2042 in distortion controller 204.This frequency spectrum regulator 2042 is coupled to analysis filter 2041, is configured for and regulates according to predetermined distortion constraints the frequency spectrum parameter generated by analysis filter 2041.As mentioned above, distortion constraints can be obtained by various mode.In the embodiment shown in Figure 2, distortion constraints can be generated by modeling device 203.
Specifically, as shown in the figure, system 200 comprises a modeling device 203, and it is coupled to the signal source (not being illustrated in figure) and frequency spectrum regulator 2042 that produce audio signal x.Modeling device 203 be configured for based on psychoacoustic model (psychoacoustic model) come audio signal x with generate cover threshold value.The various method of covering threshold value for generating for sound signal has been known in this area, for example, see " the Robust audio watermarking using perceptual masking " of the people such as M.Swanson, Signal Processing, v0l.66, pp.337-355,1998.In fact, the various method for covering audible distortion in sound signal all can be combined with embodiment of the present utility model, and scope of the present utility model is unrestricted in this regard.
The threshold value of covering generated by modeling device 203 is fed to frequency spectrum regulator 2042 by as distortion constraints.Correspondingly, frequency spectrum regulator 2042 can regulate spectral coefficient to make it lower than covering threshold value.In addition, frequency spectrum regulator 2042 it is also conceivable to other factors various, the quantizing noise of such as audio coder when regulating spectral coefficient, etc.
The spectral coefficient regulated through frequency spectrum regulator 2042 is fed to synthesis filter 2043 in distortion controller 204.Synthesis filter 2043 is coupled with frequency spectrum regulator 2042, and be configured for by through regulate spectral coefficient switch back to time domain.Such as, when analysis filter uses FFT to complete frequency domain conversion, synthesis filter 2043 can use inverse fast fourier transform (IFFT) to carry out time domain conversion.Other modes are also feasible certainly, and scope of the present utility model is unrestricted in this regard.The time-domain signal quilt conduct generated by synthesis filter 2043 is through reshaping signal bu
pinterference inverter 206 is fed to from distortion controller 204.
Continue with reference to figure 2, system 200 also comprises interference inverter 206, and it corresponds to the interference inverter 106 in system 100.In the embodiment shown in Figure 2, interference inverter 206 comprises interference computer 2061, and it is configured for according to audio signal x, pseudo noise signal u and through reshaping signal bu
pcalculate the interference value x of described sound signal to watermark decode.
Exemplarily, according to some embodiment, interference computer 2061 can calculate interference value x by the mode calculating signal projection.A kind of feasible mode calculates x like this:
x＝＜x，u＞/＜u，u＞
Wherein <, > represent the inner product between two vectors.Now, the physical meaning of x is the projection of sound signal x on PN signal u.But as mentioned above, in order to the distortion of original audio x be controlled in the scope accepted, original PN signal experienced by modulation and shaping.Like this, watermark decode square tube Chang Wufa recovers the reference signal bu that watermark embedment side uses exactly
p.
Therefore, according to preferred embodiment of the present utility model, sound signal x can calculate like this to the interference value x of watermark decode:
x＝＜x，u＞/＜u
p，u＞
In this way, by considering the master signal component u through reshaping signal when calculating interference value x
p, effectively can overcome problems of the prior art, guarantee that the reference signal extracted in watermark decode side is consistent with the watermark sequence embedded by watermark embedment side.
Return Fig. 2, interference inverter 206 also comprises compensation maker 2062, and it is coupled to interference computer 2061, is configured for based on interference value x and the master signal component u through modulation signal
pgenerate compensating signal y.Such as, in certain embodiments, compensating signal y can calculate by the two being multiplied, that is, y=xu
p.When generating final watermark signal s, y is used for the interference that compensating audio signal x brings to the watermark decode that watermark decode side performs.Such as, according to embodiment of the present utility model, the sound signal s of band watermark may be calculated:
s＝x+αbu
p-xu
p＝x+(αb-x)u
p
Wherein α is the parameter for control distortion, can arrange suitable numerical value according to actual conditions.
The example of the system for digital watermarking according to some embodiment of the utility model is described above with reference to figure 1 and Fig. 2.According to embodiment of the present utility model, can the interference of audio signal to watermark decode be included in consideration, and in embedding algorithm side, this interference be compensated in advance.Thereby, it is possible to more effectively eliminate the interference that the audio signal as carrier brings watermark decode in the future.Especially, when generating compensating signal, not only considering audio signal and original PN signal, also contemplating the impact that the frequency spectrum shaping that controls for distortion causes for PN signal.Like this, watermark decode side and the mismatch of watermark embedment side in reference signal can be eliminated, reduce the bit error rate further.
Should be appreciated that above-described specific detail and algorithm are all exemplary, according to instruction given herein and enlightenment, those skilled in the art can expect that alternative scheme is to realize above-mentioned thought.These alternativess all fall within the utility model scope.
The system described with reference to figure 1 and Fig. 2 above can profit realize in various manners.Such as, in some embodiments, system may be implemented as integrated circuit (IC) chip or special IC (ASIC) chip.Controller also can be implemented as SOC (system on a chip) (SOC), field programmable gate array (FPGA), etc.Especially, all parts comprised in system can be integrated on one single chip, and also can be encapsulated in separately independently in chip or device, scope of the present utility model is unrestricted in this regard.In fact, device that is known or that develop in the future and mode may be used to realize various embodiment of the present utility model now.
Below with reference to Fig. 3, it illustrates the process flow diagram of the method 300 for digital watermarking according to the utility model exemplary embodiment.
As shown in the figure, after method 300 starts, in step S301, spectrum modulation is carried out to generate through modulation signal bu to the watermark bit b and pseudo noise signal u that will embed described sound signal.According to some embodiment of the present utility model, this pseudo noise signal such as generates under cipher controlled.
Next, method 300 proceeds to step S302, this according to sound signal x to carry out through modulation signal bu shaping with generate meet predetermined distortion constraints through reshaping signal bu
p.According to some embodiment of the present utility model, generate through reshaping signal bu
pcan comprise: by the spectral coefficient be transformed to through modulation signal bu in frequency domain, regulate frequency spectrum parameter according to distortion constraints, and the described frequency spectrum parameter through regulating is switched back in time domain described through reshaping signal bu to generate
p.According to some embodiment of the present utility model, distortion constraints can be generate based on psychoacoustic model cover threshold value for sound signal x.
Method 300 proceeds to step S303 then, at this according to sound signal x, pseudo noise signal u with through reshaping signal bu
pgenerate compensating signal.The compensating signal generated will be used to the interference of compensating audio signal x to watermark decode.According to some embodiment of the present utility model, generate compensating signal and comprise: according to sound signal x, pseudo noise signal u and through reshaping signal bu
pcalculating signal projects, to determine the interference value x of sound signal to watermark decode; And generate described compensating signal based on interference value x with through modulation signal component.
Should be appreciated that method 300 can be that system 100 and/or 200 performs by describing above.Thus, whole features that composition graphs 1 and Fig. 2 describe above are equally applicable to method 300, do not repeat them here.And the step shown in Fig. 3 is only schematic.Such as, these steps can perform even executed in parallel according to different orders.In addition, method 300 can comprise additional step, replaces some step, or omits some step.
Equipment involved by the utility model and module thereof can be realized by the hardware circuit of the programmable hardware device of the semiconductor of such as VLSI (very large scale integrated circuit) or gate array, such as logic chip, transistor etc. or such as field programmable gate array, programmable logic device etc.Alternatively or additionally, embodiment of the present utility model also can be realized by firmware.
Although it should be noted that the some devices or sub-device that are referred to equipment in above-detailed, this division is only not enforceable.In fact, according to embodiment of the present utility model, the Characteristic and function of two or more devices above-described can be specialized in one apparatus.Otherwise, the Characteristic and function of an above-described device can Further Division for be specialized by multiple device.
In addition, although describe the operation of the utility model method in the accompanying drawings with particular order, this is not that requirement or hint must perform these operations according to this particular order, or must perform the result that all shown operation could realize expectation.On the contrary, the step described in process flow diagram can change execution sequence.Additionally or alternatively, some step can be omitted, multiple step be merged into a step and perform, and/or a step is decomposed into multiple step and perform.
Although describe the utility model with reference to some embodiments, should be appreciated that, the utility model is not limited to disclosed embodiment.The utility model is intended to contain the interior included various amendment of spirit and scope and the equivalent arrangements of claims.The scope of claims meets the most wide in range explanation, thus comprises all such amendments and equivalent structure and function.
Claims (6)
1., for a system for digital watermarking, the sound signal being suitable for producing to signal source adds watermark, and described system comprises:
Spectromodulator, is configured for and carries out spectrum modulation to generate through modulation signal to the watermark bit and pseudo noise signal that will embed described sound signal;
Distortion controller, is coupled to described signal source and described spectromodulator, is configured for and carries out shaping to described through modulation signal according to described sound signal, with generate meet predetermined distortion constraints through reshaping signal; And
Interference inverter, be coupled to described signal source and described distortion controller, be configured for according to described sound signal, described pseudo noise signal and described through reshaping signal generate compensating signal, wherein said compensating signal is for compensating the interference of described sound signal to watermark decode.
2. system according to claim 1, comprises further:
Pseudo noise generator, is coupled to described spectromodulator and described interference inverter, is configured for and generates described pseudo noise signal under cipher controlled, and described pseudo noise signal is fed to described spectromodulator and described interference inverter.
3. system according to claim 1, wherein said distortion controller comprises:
Analysis filter, is configured for the described spectral coefficient be transformed to through modulation signal in frequency domain;
Frequency spectrum regulator, is coupled to described analysis filter, is configured for and regulates described frequency spectrum parameter according to described distortion constraints; And
Synthesis filter, is coupled to described frequency spectrum regulator, is configured for and switches back in time domain described through reshaping signal to generate by the described frequency spectrum parameter through regulating.
4. system according to claim 1, comprises further:
Modeling device, is coupled to described signal source and described distortion controller, is configured for generate based on psychoacoustic model to cover threshold value for described sound signal, and described threshold value of covering is fed to and is fed to described distortion controller as described distortion constraints.
5. system according to claim 1, wherein said interference inverter comprises:
Interference computer, be configured for according to described sound signal, described pseudo noise signal and described through reshaping signal calculate signal projection to determine the interference value of described sound signal to watermark decode; And
Compensate maker, be coupled to described interference computer, be configured for based on interference value and describedly generate described compensating signal through modulation signal.
6. the system according to any one of claim 1-5, wherein said system is implemented as integrated circuit, special IC, field programmable gate array or SOC (system on a chip).
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| CN201420386838.4U CN204087787U (en) | 2014-07-09 | 2014-07-09 | For the system of digital watermarking |
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| CN201420386838.4U CN204087787U (en) | 2014-07-09 | 2014-07-09 | For the system of digital watermarking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244033A (en) * | 2014-07-09 | 2016-01-13 | 意法半导体亚太私人有限公司 | System and method for digital watermarking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244033A (en) * | 2014-07-09 | 2016-01-13 | 意法半导体亚太私人有限公司 | System and method for digital watermarking |
| CN105244033B (en) * | 2014-07-09 | 2019-07-16 | 意法半导体亚太私人有限公司 | System and method for digital watermarking |
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