JP2000101980A - Video signal transmission system, video signal output device, video signal processor and video signal transmitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and also accurately extract additional information in a device which superimposes the addited information on a video signal by using an electronic watermark technique to transmit it and also receives the supply of the video signal. SOLUTION: A WM superimposing part 2 superimposes a spectrum spread signal on a video signal, so as to generate a section which is to be superimposed and a section which is not to be superimposed. When the spectrum spread signal superimposed on the video signal is retrieved, the spectrum spread signal is detected by using plural preliminarily set thresholds. Then, whether or not the spectrum spread signal is superimposed on the video signal is surely and also accurately discriminated, and the spectrum spread signal is prevented from being erroneously detected, by detecting the superimposed/non-superimposed patterns of the video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an apparatus for superimposing additional information on a video signal by using a digital watermarking technique and transmitting the superimposed information. The present invention relates to a video signal transmission system capable of extracting additional information, a video signal output device, a video signal processing device, and a video signal transmission method used in the system.

[0002]

2. Description of the Related Art A variety of content information such as image information and audio information has been provided in abundance through video tapes, digital video disks (DVDs), the Internet, broadcast media, and the like. On the other hand, there is a problem of copyright infringement due to illegal duplication (copying) of various content information provided through various media.

In order to cope with this problem, information for copy control, copyright information, and the like are added to content information such as image information, and illegal use of the content information is prevented by using the additional information. Various measures have been considered, such as tracking an illegal duplicator of content information.

[0006] A method has been proposed in which additional information added to content information is superimposed using digital watermark processing. This digital watermarking process is a process of embedding information as noise in a part that is not important to human perception existing in image data or music data, that is, a part that is not redundant to music or video.

[0005] Additional information embedded in image data or music data by such digital watermarking processing is difficult to remove from the image data or music data. On the other hand, even after filtering and data compression of image data and music data, additional information (digital watermark information) of the digital watermark embedded in them can be extracted from the image data and music data. It is.

[0006] By using the digital watermark processing as described above, the digital watermark information can be superimposed on the content information so as not to be easily removed or falsified, and the digital watermark information superimposed on the content information can be superimposed. For example, in a recording device or the like, the content information can be extracted, so that the digital watermark information superimposed on the content information is used to prevent illegal duplication of the content information.

[0007]

By the way, one of the digital watermarking processes uses a spread spectrum technique. In this method, an additional signal is spread spectrum to make a signal of a low level and a wide band that can be regarded as noise with respect to an information signal such as image data, and is superimposed on the information signal such as image data.

[0008] Spread spectrum of the additional information is performed by multiplying the additional information by a spreading code generated at a sufficiently short period. Further, the additional information converted to a low-level, wide-band signal by spectrum spreading is despread by multiplying the same spreading code at the same timing as that at the time of the spectrum spreading to obtain the original high-level, narrow-band signal. Can be extracted as a signal.

For this reason, when digital watermark information, which is additional information spread in a spectrum, is superimposed on a video signal, for example, one frame period, two frame period, or the like is used.
It has been considered that a spread code is generated in synchronization with a vertical synchronizing signal, and additional information that has been spread with the spread code is superimposed on a video signal.

Thus, when extracting the digital watermark information superimposed on the video signal, by using the video synchronizing signal as a reference signal, the additional information superimposed and superimposed on the video signal by spectrum spreading can be obtained. Since the same spreading code as that at the time of the spread spectrum can be generated at the same timing to perform the despreading, it is possible to quickly and accurately extract additional information that is spread and superimposed on the video signal. .

However, when the diffusion rate within a predetermined vertical period is low, the extraction of digital watermark information is greatly affected by the characteristics of the video signal, and erroneous detection of digital watermark information may occur. .

In theory, when despreading is performed on a video signal on which digital watermark information is not superimposed, as shown in FIG. 15A, a waveform WB of a detection value obtained as a result of the despreading indicates the detected value. Sticks near 0. When despreading is performed on the video signal on which the digital watermark information is superimposed, the detected value becomes positive in accordance with the spreading factor as shown in a waveform WA of the detected value obtained as a result of the despreading in FIG. 15A. Shift in the direction.

For this reason, one half of the theoretical detected value D
By using (D / 2) as the threshold TH, it becomes possible to detect and determine digital watermark information superimposed on a video signal.

However, when the video signal before the digital watermark information is superimposed has a correlation with the digital watermark information, when the video signal without the digital watermark information is despread, In the case where the video signal on which the digital watermark information is superimposed is subjected to despreading, in any case, the detection value obtained as a result of the despreading is either the positive direction or the negative direction. The value is shifted to

In other words, when the video signal before the digital watermark information is superimposed and the digital watermark information to be superimposed have a correlation, in FIG. 15B, the video signal without the digital watermark information is despread. As shown by the waveform WB of the detection value obtained by performing the above, and the waveform WA of the detection value obtained by performing the despreading on the video signal on which the digital watermark information is superimposed, in any case, The detection value obtained as a result of despreading is a value shifted in the positive direction.

In this case, even when despreading is performed on a video signal on which digital watermark information is not superimposed, the threshold value which is a half of the theoretical detection value D is used. (D / 2) may be exceeded, in which case an erroneous detection will result.

In view of the above, the present invention superimposes additional information on a video signal by using a digital watermarking technique and transmits the same, and in a device receiving the video signal, reliably and accurately extracts the additional information. It is an object of the present invention to provide a video signal transmission system, a video signal output device, a video signal processing device, and a video signal transmission method used in the system.

[0018]

According to a first aspect of the present invention, there is provided a video signal transmission system according to the first aspect of the present invention.
A video signal transmission system comprising: a video signal output device that outputs a video signal on which additional information is superimposed; and a video signal processing device that has a function of detecting the additional information from the video signal from the video signal output device. Wherein the video signal output device includes a spread spectrum means for generating a spread spectrum signal obtained by spreading the additional information by a spread code; a superimposing means for superimposing the spread spectrum signal from the spread spectrum means on a video signal; Controlling the generation of a spread code in synchronization with a video synchronization signal, and controlling the generation of the spread spectrum signal so as to generate a superimposed section and a non-superimposed section with respect to the video signal. And controlling the superimposed / non-superimposed pattern of the spread spectrum signal to be a predetermined pattern. The video signal processing device performs despreading using a spreading code for despreading, and processes the additional information superimposed on the video signal supplied from the video signal output device. A despreading means for extracting, a timing control means on the processing device side for controlling the generation of the despreading spread code in synchronization with a video synchronization signal, and a detection output supplied from the despreading means. And additional information discriminating means for discriminating the additional information which has been spectrally spread and superimposed on the video signal.

According to the video signal transmission system of the first aspect, the video signal output device generates a section where the spread spectrum signal is superimposed on the video signal and a section where the spread spectrum signal is not superimposed. And superimposed. The superimposed / non-superimposed pattern of the spread spectrum signal is a predetermined pattern. Then, the video signal on which the spread spectrum signal is superimposed is supplied to the video signal processing device.

In the video signal processing device, despreading is performed using a despreading code generated in synchronization with the video synchronization signal, and additional information superimposed on the supplied video signal is extracted. The content indicated by the additional information is determined.

As described above, the spread spectrum signal is superimposed on the video signal so as to generate a superimposed section and a non-superimposed section, thereby making it difficult to remove or falsify the spread spectrum signal. This makes it possible to more reliably transmit the superimposed spread spectrum signal.

Further, even if there is a relatively high correlation between a video signal and a spread spectrum signal (digital watermark information) superimposed on the video signal, the superimposition / non-superimposition pattern of the spread spectrum signal is determined. By detecting, it is reliably detected whether or not the spread spectrum signal is superimposed on the video signal, and the spread spectrum signal superimposed on the video signal can be detected without causing the false detection of the spread spectrum signal. It is possible to reliably extract the contents, determine the contents, and use the contents.

A video signal transmission system according to a second aspect of the present invention is the video signal transmission system according to the first aspect, wherein the superimposed / non-superimposed pattern of the spread spectrum signal is an irregular pattern. It is characterized by being.

According to the video signal transmission system of the second aspect, the superimposition / non-superimposition pattern of the spread spectrum signal is not controlled by regularly superimposing the spread spectrum signal on the video signal, but by timing control means. By
It is made to be an irregular pattern.

This makes it impossible to easily distinguish the superimposed section of the spread spectrum signal from the non-superimposed section, thereby making it more difficult to falsify or remove the spread spectrum signal and to convert the spread spectrum signal into an image. It is possible to further improve the reliability of a transmission system that transmits a signal by superimposing it on a signal.

A video signal transmission system according to a third aspect of the present invention is the video signal transmission system according to the first or second aspect, wherein the additional information discriminating means of the video signal processing device comprises: N (N is an integer of 1 or more) thresholds for detecting additional information are provided, and a spectrum spread is applied to the video signal by using a detection output from the despreading unit and each of the N thresholds. The additional information that has been superimposed and superimposed is determined.

According to the video signal transmission system of the third aspect, when a spread spectrum signal superimposed on a video signal is detected, the detection is performed using a plurality of preset threshold values. .

Thus, even when there is a relatively high correlation between the video signal and the spread spectrum signal superimposed on the video signal, when the spread spectrum signal is superimposed on the video signal, By using a threshold (threshold) suitable for detecting additional information, it is possible to reliably detect additional information and determine its content.

A video signal transmission system according to a fourth aspect of the present invention is the video signal transmission system according to the first or second aspect, wherein the additional information discriminating means of the video signal processing device comprises: Among the detection outputs from the despreading means, the difference between the average value of the detection output in the superimposed section of the spread spectrum signal and the average value of the detection output in the non-superimposed section of the spread spectrum signal is a predetermined value. When the above is the case, it is detected that the spread spectrum signal is superimposed on the supplied video signal.

According to the video signal transmission system of the fourth aspect, the average value of the detection output obtained as a result of despreading in the superimposed section where the spread spectrum signal should be superimposed, and the spread spectrum signal are not superimposed. The difference from the average value of the detection output obtained as a result of despreading for the non-overlapping section to be set is calculated.

When the obtained difference is equal to or larger than a predetermined value, that is, when the spread spectrum signal is superimposed on the superimposed section and the spread spectrum signal is not superimposed on the non-superimposed section, the difference occurs. Is detected only when the spread spectrum signal is superimposed on the video signal.

Thus, it is reliably detected whether or not a spread spectrum signal is superimposed on a video signal, and erroneous detection of a spread spectrum signal can be reliably prevented.

According to a fifth aspect of the present invention, there is provided a video signal transmission system for outputting a video signal on which additional information is superimposed, and the additional information from the video signal from the video signal output device. A video signal transmission system comprising a video signal processing device having a function of detecting the spectrum information, wherein the video signal output device generates a spread spectrum signal in which additional information is spread spectrum by a spread code, and the spectrum spread means; Superimposing means for superimposing the spread spectrum signal from the spreading means on the video signal, and generating and controlling the spread code in synchronization with the video synchronization signal, wherein the spread spectrum signal is superimposed on the video signal as it is. Generation control is performed so as to generate a section and a section that is superimposed by inverting the phase. Timing control means for controlling the phase inversion pattern of the spread spectrum signal to be a predetermined pattern, wherein the video signal processing device performs despreading using a despreading spreading code. Despreading means for extracting the additional information superimposed on the video signal supplied from the video signal output device, and controlling generation of the despreading spread code in synchronization with a video synchronization signal And a supplementary information discriminating means for discriminating the supplementary information which is supplied with the detection output from the despreading means and which is spectrum-spread and superimposed on the video signal. It is characterized by the following.

According to the video signal transmission system of the fifth aspect, the video signal output device is configured to invert the phase and the section where the spread spectrum signal is superimposed on the video signal as it is. Are superimposed on each other. The pattern of the phase inversion is a predetermined pattern. Then, the video signal on which the spread spectrum signal is superimposed is supplied to the video signal processing device.

In the video signal processing device, despreading is performed using a despreading spreading code generated in synchronization with the video synchronizing signal, and additional information superimposed on the supplied video signal is extracted. The content indicated by the additional information is determined.

As described above, the spectrum is superimposed on the video signal such that a section in which the spread spectrum signal is superimposed as it is and a section in which the phase of the spread spectrum signal is inverted and superimposed are generated. This makes it difficult to remove or tamper with the spread signal, so that the spread spectrum signal superimposed on the video signal can be transmitted more reliably.

Further, even when there is a relatively high correlation between the video signal and the spread spectrum signal (digital watermark information) superimposed thereon, the phase inversion pattern of the spread spectrum signal is detected. By doing so, it is reliably detected whether or not the spread spectrum signal is superimposed on the video signal, and the spread spectrum signal superimposed on the video signal can be reliably detected without causing erroneous detection of the spread spectrum signal. , The contents of which are determined and used.

According to a sixth aspect of the present invention, there is provided the video signal transmission system according to the fifth aspect, wherein the phase inversion pattern of the spread spectrum signal is an irregular pattern. There is a feature.

According to the video signal transmission system of the sixth aspect, the phase inversion pattern of the spread spectrum signal does not regularly invert the phase of the spread spectrum signal. The phase inversion pattern of the signal is made an irregular pattern.

This makes it impossible to easily distinguish between a section in which the spread spectrum signal is superimposed as it is and a section in which the spread spectrum signal is inverted and superposed. This makes it difficult to falsify or remove the spread spectrum signal, and further improves the reliability of the transmission system that transmits the spread spectrum signal by superimposing it on the video signal.

A video signal transmission system according to a seventh aspect of the present invention is the video signal transmission system according to the fifth or sixth aspect, wherein the additional information determination means of the video signal processing device comprises: N (N is an integer of 1 or more) thresholds for detecting additional information are provided, and a spectrum spread is applied to the video signal by using a detection output from the despreading unit and each of the N thresholds. The additional information which is superimposed and superimposed is determined.

According to the video signal transmission system of the present invention, when detecting the spread spectrum signal superimposed on the video signal, the detection is performed using a plurality of preset threshold values. .

Thus, even when there is a relatively high correlation between the video signal and the spread spectrum signal superimposed on the video signal, when the spread spectrum signal is superimposed on the video signal, By using a threshold (threshold) suitable for detecting additional information, it is possible to reliably detect additional information and determine its content.

The video signal transmission system according to claim 8 is the video signal transmission system according to claim 5 or 6, wherein the additional information discriminating means of the video signal processing device includes Of the detection output from the diffusion means,
The difference between the average value of the detection output in the section where the spread spectrum signal is superimposed as it is and the average value of the detection output in the section where the spread spectrum signal is superposed with the phase inverted is predetermined. When the difference is equal to or more than the value, it is detected that a spread spectrum signal is superimposed on the supplied video signal.

According to the video signal transmission system of the eighth aspect, the average value of the detection output obtained as a result of the despreading for the non-inverted section where the spread spectrum signal should be superimposed as it is, and the phase of the spread spectrum signal are The difference from the average value of the detection output obtained as a result of despreading for the inverted section to be inverted and superimposed is obtained.

When the obtained difference is equal to or larger than a predetermined value, that is, the spread spectrum signal is superimposed as it is in the non-inversion section, and the phase-inverted spectrum spread signal is superposed in the inversion section. Only when there is a difference that occurs when the spread spectrum signal is present, it is detected that the spread spectrum signal is superimposed on the video signal.

Thus, it is reliably detected whether or not the spread spectrum signal is superimposed on the video signal, so that erroneous detection of the spread spectrum signal can be reliably prevented.

[0048]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a video signal transmission system, a video signal output device, a video signal processing device, and a video signal transmission method used in the video signal transmission system according to the present invention. It will be described with reference to FIG.

In the embodiments described below, a video signal transmission system according to the present invention includes a video signal recording apparatus for recording a video signal on a digital video disk (hereinafter abbreviated as a DVD), and a video signal recording apparatus. A description will be given assuming that the present invention is applied to a system including a video signal reproducing apparatus for reproducing a video signal from a DVD on which a video signal is recorded by the apparatus.

The video signal recording device of the video signal transmission system described below converts an information signal such as a video signal into a D signal.
This is used by the provider of the content information recorded and provided in the VD, and is called an authoring device. In addition, the video signal reproducing device,
It is a DVD playback device.

In the embodiments described below, the video signal recording device, when recording the video signal on a DVD, prevents the video signal from being copied illegally in order to prevent the video signal from being copied illegally. On the other hand, the copy control information is spectrally spread and superimposed as additional information. In this case, the additional information is generated in synchronization with the vertical synchronization signal by a PN (Pseudorandom Noise).
e; pseudo-noise code) The spectrum is spread by a code of a sequence (hereinafter referred to as a PN code).

The spread spectrum additional information is superimposed on the video signal by controlling so as to generate a superimposed section and a non-superimposed section, or
By inverting the phase of the spread-spectrum additional information, control is performed so as to generate a section in which positive value additional information is superimposed and a section in which negative value additional information is superimposed. To do it.

As described above, the superimposed / non-superimposed pattern or the phase inversion pattern of the spectrum-spread additional information with respect to the video signal is a predetermined artificial pattern. Even if the spread spectrum additional information and the video signal on which it is superimposed have a correlation, the spectrum information is spread and superimposed on the video signal without erroneous detection. The additional information can be accurately detected.

The video signal recording apparatus can record not only video signals but also audio signals on a DVD. However, for simplicity, the description of the audio system is omitted below. I do. Further, a recording device and a playback device that can perform the copy generation restriction process based on the additional information added to the video signal are called compliant devices, and a device that does not support the copy generation restriction process is called a non-compliant device. Called a compliant device.

[First Embodiment] [Regarding Authoring Apparatus] FIG. 1 is a block diagram for explaining an authoring apparatus (video signal recording apparatus) according to this embodiment. As shown in FIG. 1, the authoring apparatus according to this embodiment includes an input terminal 1 for a video signal, a digital watermark information superimposing unit (hereinafter, referred to as a WM superimposing unit) 2, a timing control unit 3, a spread spectrum processing unit 4, a level Adjustment unit 5, data compression processing unit 6, CGMS information addition unit 7, CGMS information generation unit 8, encryption unit 9, recording processing unit 1
0 is provided. Also, the spread spectrum processing unit 4
It comprises a PN generator 41, an SS spreader 42, and a copy control information generator 43.

FIG. 2 is a block diagram for explaining the timing control section 3 of the authoring apparatus according to this embodiment. As shown in FIG.
Is composed of a synchronization detection unit 31 and a PN generation control unit 32. The PN generation control unit 32 includes a PN generation timing signal generation unit 321, a PN clock signal generation unit 322 including a PLL, and a timing signal generation unit 323.

In the authoring apparatus shown in FIG.
The video signal to be recorded on VD100 is input terminal 1
Is supplied to the WM superimposing unit 2 and the synchronization detecting unit 31 of the timing control unit 3. The synchronization detection unit 31 detects a vertical synchronization timing signal V and a horizontal synchronization timing signal H from the video signal, and supplies the detection output to each unit of the PN generation control unit 32.

The PN generation control unit 32 uses the vertical synchronization timing signal V and the horizontal synchronization timing signal H as reference signals to indicate the PN code generation start timing.
A code reset timing signal RE (hereinafter, abbreviated as a reset signal RE) and a PN generation enable signal EN (hereinafter, an enable signal E) indicating a section in which a PN code is generated.
N) and a clock signal PNCLK.

In this embodiment, the PN generation timing signal generator 321 and the timing signal generator 3
The horizontal synchronization timing signal H and the vertical synchronization timing signal V from the synchronization detection unit 31 are supplied to
The clock generation unit 322 is supplied with the horizontal synchronization timing signal H from the synchronization detection unit 31.

The PN generation timing signal generator 3
21 is a vertical synchronization timing signal V (see FIG. 3A)
Is used as a reference signal to generate a reset signal RE having a vertical period that determines a repetition period of a spreading PN code string used for spectrum spreading, as shown in FIG. 3B.
In this example, the reset signal RE is a signal of five vertical periods falling at, for example, the leading edge of the vertical synchronization timing signal V.

The PN generation timing signal generation section 321
In the case of this example, the vertical synchronization timing signal V
The PN generation enable signal EN is generated using the reference signal (see FIG. 3A) as a reference signal. In this example, the PN generation enable signal EN is generated as a signal for causing the PN generation unit 41 of the spread spectrum processing unit 4 to generate a PN code every five vertical sections (see FIG. 3C). That is, as shown in FIG. 3C, the PN generation enable signal EN is a signal in which a low-level signal section and a high-level signal section are alternately repeated every five vertical sections. This PN generation enable signal EN is low active.

The PN clock generation unit 322 generates a PN clock PNCLK (see FIG. 3D) synchronized with the horizontal synchronization timing signal H using a PLL. In addition, the timing signal generation unit 323 generates various timing signals used in the authoring apparatus of FIG. 1 based on the vertical synchronization timing signal V and the horizontal synchronization timing signal H.

As shown in FIG. 1, among the signals generated by the timing control unit 3, the reset signal R
E, enable signal EN, PN clock signal PNCLK
Is supplied to the PN generator 41, and the enable signal EN and the PN clock signal PNCLK are also supplied to the copy control information generator 43.

The PN generator 41 generates a reset signal RE,
The PN code is generated according to the enable signal EN and the clock signal PNCLK. That is, the PN generator 41
Are reset by a reset signal RE in this example at five vertical periods, and generate a PN code sequence PS having a predetermined code pattern from the beginning. Then, the PN generator 41 generates the PN code string PS according to the clock signal PNCLK only when the PN code can be generated (enable state) by the enable signal EN.

In the case of this example, as described above, P
The N generator 41 is set to be capable of generating a PN code when the enable signal EN is at a low level.
As shown in (E), the PN code is generated every five vertical intervals, and the PN code is generated at a rate of one chip for each clock of the PN clock signal PNCLK.

Then, the PN generator 41 is reset at the beginning of every five vertical sections by the reset signal RE. In this embodiment, as shown in FIG. 3C, a PN code is generated every five vertical intervals according to the enable signal EN. The PN code string PS having the determined code pattern is generated from the beginning. The PN code string PS thus obtained from the PN generating section 41 is supplied to the SS spreading section 42.

As described above, the PN generator 41 generates the M-sequence PN code string PS based on the enable signal EN, the PN clock signal PNCLK, and the reset signal RE. , A multi-stage shift register, and several exclusive OR circuits for calculating an appropriate tap output of the shift register.

On the other hand, based on the clock PNCLK, the duplication control information generation section 43 performs spectrum spreading and superimposition on the video signal input through the input terminal 1 at the timing of the enable signal EN from the timing control section 3. , And outputs this based on the clock PNCLK and supplies it to the SS spreading unit 42. That is, the copy control information generation unit 43
At the same timing as the PN code string PS, the copy control information string F
S is formed and supplied to the SS diffusion unit 42.

In this embodiment, low bit rate information indicating which copy control state can be duplicated, cannot be duplicated, and only one generation can be duplicated is generated as the duplication control information. I have. The copy control information generating section 43 can generate copy control information corresponding to a video signal to be recorded on the DVD 100 under the control of a control section (not shown).

The SS spreading section 42 includes the copy control information generating section 4
3 is a digital watermark information (SS copy control information) that is spread spectrum using the PN code string PS and superimposed on the video signal input through the input terminal 1.
To form

The digital watermark information formed in the SS spreading section 42 is supplied to the WM superimposing section 2 through the level adjusting section 5. The level adjustment unit 5 adjusts the superimposition level of the digital watermark information by superimposing the digital watermark information on the video signal so that the video reproduced by the video signal does not deteriorate. In this embodiment, the level adjustment unit 5 adjusts the level of the digital watermark information so that the digital watermark information is superimposed at a level smaller than the dynamic range of the video signal. The level-adjusted digital watermark information is supplied to the WM superimposing unit 2.

Then, the WM superimposing section 2 superimposes the digital watermark information (SS copy control information) supplied through the level adjusting section 5 on the video signal supplied from the input terminal 1. The video signal on which the digital watermark information has been superimposed in the WM superimposing unit 2 is supplied to the data compression processing unit 4.

The data compression processing section 6 compresses the supplied video signal by the MPEG method. And
In this embodiment, a CGMS (Copy Generation Ma)
In order to add duplication control information of the C.N.
The information is supplied to the information adding unit 7.

In the CGMS system, for example, in the case of an analog image signal, 2-bit additional information for duplication control is superimposed on a specific one horizontal section in the vertical blanking period. 2-bit additional information for copy control (hereinafter referred to as CGMS)
(Referred to as information).

The CGMS information adding section 7 adds CGMS information supplied from the CGMS generating section 8 to the digital video signal which has been compressed. The CGMS information generation unit 8
Based on a control signal from a control unit (not shown),
CGMS information to be added to the video signal to be transmitted is generated. C generated in the CGMS information generation unit 8
The GMS information means any one of “copy permitted [00]”, “copy once [10]”, and copy prohibited [11].

In the CGMS information adding section 7, the CGMS
The video signal to which the information has been added is supplied to the encryption unit 9. In this embodiment, the encryption unit 9 converts the video signal into a CSS (Contents Scramble S).
system) encryption processing. The CSS encryption processing is an encryption processing method performed on an information signal when an information signal such as a video signal is recorded and provided on a disk medium such as a DVD.

The video signal that has been subjected to the encryption processing in the encryption section 9 is supplied to the recording processing section 10. The recording processing unit 9 performs adjustment processing for recording the supplied video signal on the DVD 100, and converts the supplied video signal to a DVD.
Record at 100.

As a result, the DVD 100 superimposes the spread-spectrum copy control information as digital watermark information, and records a video signal to which CGMS information is added. The video signal is provided to the user using the DVD 100 as a medium. To be.

In this case, the digital watermark information (SS duplication control information), which is the duplication control information spread spectrum, does not degrade the video signal even if it is superimposed on the video signal. Digital watermark information superimposed on a signal is difficult to remove or falsify. For this reason, the digital watermark information can be reliably supplied to a recording device or a reproducing device together with the information signal to be subjected to the duplication control, and the supplied digital watermark information (SS duplication control information ), Reliable duplication control and reproduction control can be performed.

FIG. 4 shows the relationship between the copy control information, which is spread and superimposed as digital watermark information and superimposed, and the video signal by spectrum. The copy control information contains a small amount of information, is a low bit rate signal, and is a narrow band signal as shown in FIG. When this is subjected to spectrum spreading, a signal having a wide bandwidth as shown in FIG. 4B is obtained. At this time, the spread spectrum signal level decreases in inverse proportion to the band expansion ratio.

The spread spectrum signal, that is, the digital watermark information (SS copy control information) is superimposed on the video signal by the WM superimposing unit 2. In this case, FIG.
As shown in (c), the digital watermark information is superimposed at a level smaller than the dynamic range of the video signal as the information signal. By superimposing in this way, deterioration of the main information signal can hardly occur. Therefore, as described above, the video signal on which the digital watermark information is superimposed is supplied to the monitor receiver,
When the video is reproduced, the digital watermark information has almost no effect, and a good reproduced video can be obtained.

On the other hand, as will be described later, when inverse spectrum spreading is performed to detect digital watermark information, FIG.
As shown in (d), the digital watermark information is restored again as a narrowband signal. By giving a sufficient band spreading factor, the power of the duplication control information after despreading exceeds the information signal and becomes detectable.

In this case, since the digital watermark information superimposed on the video signal is superimposed on the video signal at the same time and within the same frequency, it is impossible to delete or correct it by replacing the frequency filter or simple information.

Therefore, since the SS copy control information superimposed on the video signal is not removed and its falsification is difficult, it is possible to carry out copy control that can reliably prevent unauthorized duplication.

The authoring apparatus of this embodiment has a PN of 5 vertical cycles using a vertical synchronizing signal as a reference signal.
Since the spread spectrum is performed using a code string, a PN code for despreading is generated for a video signal at the same timing as that of the spread spectrum by using a vertical synchronization signal as a reference signal. Therefore, the digital watermark information can be quickly extracted.

Further, in this embodiment, the digital watermark information is superimposed on the video signal every five vertical periods. That is, the superimposition / non-superimposition pattern of the digital watermark information is set to a predetermined pattern. Therefore, when extracting the digital watermark information superimposed on the video signal, it is possible to accurately detect whether the digital watermark information is superimposed on the video signal by detecting a superimposition / non-superimposition pattern of the digital watermark information. Will be able to.

Thus, when despreading is performed on a video signal on which digital watermark information is not superimposed, a digital watermark which can obtain a detection result as if digital watermark information is superimposed is obtained. It is also possible to prevent erroneous detection of information.

[Reproduction Apparatus] FIG. 5 shows a DVD 1 created by the authoring apparatus described above with reference to FIG.
FIG. 12 is a block diagram for explaining a DVD reproducing apparatus that reproduces and outputs a video signal recorded from 00 to 00.

As shown in FIG. 5, the reproducing apparatus according to this embodiment comprises a reading section 21, a descrambling section 22, a video data decoding section 23, a D / A conversion circuit 24, an analog video signal output terminal 25a, CGMS decoding unit 2
5, WM decoding unit 26, encryption unit 27, IEEE13
A 94 interface 28, a digital video signal output terminal 28d, a control unit 30, and a key operation unit 31 are provided.

The user operates the key operation unit 31 to
When an instruction to reproduce a video signal recorded on the DVD 100 is given, the reading unit 21 reads the video signal from the DVD 100. The video signal read by the reading unit 21 is supplied to a descrambling unit 22, and a descrambler for descrambling the video signal is descrambled.
A scrambling process is performed.

The descrambled video signal is
The video data is supplied to the video data decoding unit 23. Since the descrambled video signal is MPEG-compressed, the video signal is MPEG-decoded and decompressed in the video data decoding unit 23 in order to supply the video signal to, for example, a display monitor. This MPE
The G-decoded video signal is supplied to a D / A conversion circuit 24, where it is converted to an analog signal, and then output through an analog video signal output terminal 24a, for example, to a display monitor device or a recording device. .

In this embodiment, the MPEG-compressed video data from the descrambler 52 can be digitally output through an IEEE 1394 standard interface bus.

In the IEEE 1394 standard interface, transmission digital information is encrypted in order to prevent unauthorized duplication, but it is necessary to verify whether the output destination is a compliant device and to control the duplication. And verifies the CGMS information and the digital watermark information, and decides, based on the verification result, whether to send a key to the output destination for decrypting the encryption.

The above communication control method is based on IEEE1394.
Called a secure bus, the digital interface is thereby effectively protected from duplication.

The video signal output from the descrambling unit 22 is supplied to a CGMS decoding unit 25, and CGMS information added to the video signal is extracted. The CGMS information is extracted by the CGMS information decoding unit 25 as 2-bit information at a specific position separated from the video data, and the 2-bit information is supplied to the control unit 30.

The video data decoded by the video data decoding unit 23 is converted into a digital watermark information decoding unit (hereinafter referred to as a WM decoding unit) 2.
6 and the digital watermark information added to the video data is extracted.

FIG. 6 is a block diagram for explaining the WM decoding unit 26. As shown in FIG. 6, in this embodiment, the WM decoding unit 26 includes a timing control unit 261, a PN generation unit 262, a despreading unit 263, and a WM determination unit 264.

FIG. 7 is a diagram for explaining the timing control section 261 of this embodiment. As shown in FIG. 7, the synchronization detection unit 61 includes a PN generation control unit 62. The PN generation control unit 62 includes a PN generation timing signal generation unit 621, a PN clock signal generation unit 622 including a PLL, and a PN clock signal generation unit 622. The signal generator 623 is provided.

As described above, the timing control unit 261
Although the configuration is substantially the same as that of the timing control unit 3 described above with reference to FIG. 2, the digital watermark information is superimposed on the basis of the signal JD from the WM determination unit 264 as described later. A reset signal RE, an enable signal EN, and a PN clock signal PNCLK for generating a PN code for despreading are generated from the beginning of the vertical cycle, and other timings are generated.

Then, the video data from the video data decoding unit 23 is supplied to the despreading unit 263 as shown in FIG.
And to the timing control unit 261. In the timing control section 261, the synchronization detection section 61 detects a vertical synchronization timing signal V and a horizontal synchronization timing signal H from the supplied video signal, and outputs the detection outputs to the PN generation timing signal generation section 6.
21, a PN clock signal generator 622, and a timing signal generator 623.

In the PN generation timing signal generator 621, a reset signal RE and an enable signal EN are formed using the vertical synchronization timing signal V as a reference signal. The PN clock signal generation unit 622 forms the PN clock signal PNCLK using the horizontal synchronization timing signal H as a reference signal. Further, in the timing signal generation section 623, a timing signal used in each section of the reproducing apparatus shown in FIG. 5 is formed and supplied to each section.

As described above, in the present embodiment, the timing control section 261 of the reproducing apparatus converts the input video signal into a digital watermark superimposed on the video signal based on the video synchronization signal of the video signal. Reset signal RE and PN clock signal P used during spread spectrum of information
Form the same signal that provides the same timing as NCLK. Then, in the reproducing apparatus of this embodiment, the enable signal EN is generated so as to generate the PN code in any of the five vertical sections that match the reset period of the PN code.

That is, in the reproducing apparatus of this embodiment, the PN code for despreading is reset in five vertical cycles based on the reset signal RE, and any one of the five PN codes based on the enable signal EN. The PN code is also generated in the section.

These signals are supplied to a PN generator 262. The PN generator 262 has the same configuration as the PN generator 41 described above with reference to FIG. Accordingly, in the PN generation unit 262, the same PN code string PS as when the copy control information is spectrum-spread and the digital watermark information is formed on the video signal on which the digital watermark information is superimposed is obtained. It is generated at the same timing in any of the five vertical sections, which are units of superimposition of digital watermark information. The PN code string PS generated in the PN generation section 262 is supplied to the despreading section 263.

The despreading section 263 performs despreading using the PN code string PS from the PN generating section 262,
The duplication control information sequence FS superimposed as digital watermark information on the video signal supplied to the video signal 3 is extracted. The extracted copy control information sequence FS is supplied to the WM determination unit 264.

In this embodiment, the WM determination section 26
4 detects whether or not digital watermark information has been detected in five consecutive vertical sections based on the copy control information sequence FS from the despreading unit 263, and uses the detection result as a signal JD as a PN Generation timing signal generator 6
21.

When the signal JD from the WM determining unit 261 does not indicate that digital watermark information has been detected in five consecutive vertical sections, the reset signal R
E. The phase of the enable signal EN is shifted, for example, in units of one vertical section.

In this way, five consecutive 5
Reset so that the digital watermark information can be detected in the vertical section, that is, a PN code for despreading is generated and despreading can be performed from the beginning of 5 vertical sections, which is a unit for superimposing digital watermark information. The generation of the signal RE and the enable signal can be controlled.

In this embodiment, the copy control information sequence FS from the despreading unit 263 is supplied to the WM judging unit 264, and the enable signal EN and the PN
A clock signal PNCLK, and a switching timing signal for switching a plurality of thresholds to be described later are also supplied. The switching timing signal for switching the threshold is generated by the timing signal generator 623 of the timing controller 261. Then, in the WM determination unit 264 of the playback device of this embodiment, the enable signal EN is used to determine the superimposition / non-superimposition section of the digital watermark information.

In this way, after the phases of the reset signal RE and the enable signal EN are adjusted so as to provide the video signal with the same timing as when the spectrum of the copy control information is spread, the WM determination is performed. The part 264
Based on the detection output from the despreading unit 263, it is detected whether the superimposition / non-superimposition pattern of the digital watermark information is a predetermined pattern. In the case of this embodiment,
As shown in FIG. 8, the digital watermark information includes five vertical sections (5
Frame), superimposed every other 5 frames (5 frames)
Every non-overlapping section of the digital watermark information exists.

For this reason, in the WM determination section 264,
By detecting whether or not digital watermark information has been detected every five frames from the value of the extracted output from the despreading unit 263, the digital watermark information is added to the video signal supplied to the playback apparatus of this embodiment. It is detected whether or not they are superimposed.

That is, despite the section where the digital watermark information should be superimposed, the level of the detection output obtained as a result of despreading is low, or the section where the digital watermark information should not be superimposed. However, by detecting whether the superimposition / non-superimposition pattern of the digital watermark information is different from that at the time of superimposition, for example, the level of the detection output when the digital watermark information is superimposed is high. And whether or not digital watermark information is superimposed on the video signal.

When the WM judging section 264 detects that the superimposition / non-superimposition pattern of the digital watermark information is a predetermined pattern and the digital watermark information is superimposed, the copy control from the despreading section 264 is performed. Information sequence F
The copy control state indicated by S is determined.

In this embodiment, the WM judging section 264 uses a plurality of thresholds (thresholds) to extract the copy control information superimposed as digital watermark information. In this embodiment, as shown in FIG. 9, a detection value D obtained as a result of despreading theoretically obtained, a half value D / 2, a negative value of these values, That is, four values of -D and -D / 2 are set as thresholds.

As described above, since the digital watermark information and the video signal on which the digital watermark information is not superimposed have a correlation, the detection obtained as a result of despreading the video signal on which the digital watermark information is not superimposed is obtained. As shown by the waveform WB in FIG. 9, the value may exceed the set threshold, resulting in erroneous detection.

Therefore, the WM determination unit 26 of this embodiment
4 are these four thresholds + D, + D / 2,
By detecting digital watermark information using −D / 2 and −D, the most appropriate threshold is selected, and the digital watermark information is extracted using the selected threshold. I'm trying to do it. These four thresholds are stored, for example, in the memory of the control unit 30 of the playback device, and are supplied to the WM determination unit 264.

In this embodiment, based on the timing signal from the timing control unit 261,
For example, the threshold is changed for each vertical section. Then, a threshold most suitable for detecting digital watermark information is selected. For example, the despreading unit 26
A threshold most suitable for detecting digital watermark information is selected by, for example, selecting a threshold at which the difference between the detected value from No. 3 and the threshold is equal to or greater than a predetermined value.

For example, in the example shown in FIG. 9, since the digital watermark information and the video signal have a correlation, when the video signal on which the digital watermark information is not superimposed is despread, , Exceeds the value of D / 2, as shown by the waveform WB of the detected value. Therefore, by using the value + D as the threshold, the digital watermark information can be accurately detected.

When a threshold suitable for detecting digital watermark information is selected, information indicating that the threshold has been selected is supplied from the WM determination unit 264 to the timing control unit 261. Therefore, the timing signal for switching the threshold is temporarily stopped. Thereafter, for example, when the digital watermark information cannot be normally detected, a signal notifying this is transmitted to the WM.
Since the determination unit 264 supplies the timing control unit 261, the timing signal for switching the threshold is again supplied to the WM determination unit 264, and the threshold is changed.

Then, as shown by the waveform WA in FIG. 9, when the video signal on which the digital watermark information is superimposed every five vertical sections is subjected to despreading, in the section where the digital watermark information is superimposed, The level of the detection value from the despreading unit 263 is high, and the level of the detection value from the despreading unit 263 is low in the section where the digital watermark information is not superimposed. ,
A superimposition / non-superimposition pattern of the digital watermark information is detected, and it is accurately determined whether or not the digital watermark information is superimposed on the video signal. It can be determined.

The WM determining section 264 determines whether or not digital watermark information is superimposed on the video signal.
In addition to simply detecting the superimposed / non-superimposed pattern, of the detection output from the despreading unit 263, the average of the detection values determined as plus (+) and the minus (-) with respect to the threshold are determined. When the difference from the average of the detected values is equal to or greater than a predetermined value S, it may be determined that the digital watermark information is superimposed on the video signal.

That is, the average of the detected values in the section where the digital watermark information is superimposed and the average of the detected values in the non-superimposed section where the digital watermark information is not superimposed are obtained. When the value is equal to or larger than the predetermined value S, it is determined that the digital watermark information is superimposed on the video signal.

Thus, even if the digital watermark information and the video signal have a correlation, it is possible to more reliably determine whether the digital watermark information is superimposed on the video signal. Note that the predetermined value S, which is a comparison value with the difference between the average values, is set as, for example, a value equal to or more than half the detection value D obtained as a result of despreading theoretically obtained.

In this way, the WM determining section 264 determines that the digital watermark information is superimposed on the video signal, and indicates the copy control state indicated by the copy control information superimposed on the video signal as the digital watermark information. Is determined, and the determination output is supplied to the control unit 30.

The output data of the descrambling unit 22 is supplied to the encrypting unit 27, and under the control of the control unit 30, the compressed video data is subjected to encryption based on a different encryption key for each communication. The encrypted data from the encrypting unit 27 is supplied to the output destination electronic device through the IEEE1394 interface 28 and the output terminal 28d. IEEE 1394 interface 2
8 performs data conversion and outputs data so as to conform to the IEEE 1394 interface standard.

At this time, the control unit 30 sets the IEEE
The device communicates with the output destination device through the E1394 interface 28, and determines whether the output destination device is a compliant device or, if the device is a compliant device, a recording device.

Then, the control unit 30 performs the CGMS
From the discrimination output of the copy control information from each of the decoding unit 25 and the WM decoding unit 26, and the discrimination information of the output destination device through the IEEE 1394 interface 28, the encryption key information for decrypting the encryption by the encryption unit 27 is obtained. Determines whether to send to the output destination.

For example, when the output destination is a non-compliant device, the encryption key information is not passed to the output destination device. Even when the output destination is a compliant device, if it is a recording device, the CGMS
When the information is [11] indicating "copy prohibited", or
When the digital watermark information indicates "copy prohibited", the encryption key information is not passed to the output destination device.

As described above, in the reproducing apparatus of this embodiment, the digital watermark information as the copy control information is superimposed, and the CGMS information as another copy control information is superimposed and recorded on the DVD 100. Reads the signal and performs necessary processing such as descrambling (decryption processing), decompression of data-compressed digital video signals, and formation of output video signals, as described above. , And a digital video signal to be output through a digital interface.

When a digital video signal is output through a digital interface, as described above, it is ensured that illegal duplication is prevented by the function of the digital interface IEEE 1394 and based on digital watermark information and CGMS information. It is planned.

In this case, in the digital watermark information, a section to be superimposed and a section not to be superimposed are generated with respect to the video signal. In this case, the superimposition / non-superposition pattern of the digital watermark information is set to a predetermined pattern. To be.
By detecting the superimposed / non-superimposed pattern, it is possible to reliably detect whether or not the digital watermark information is superimposed on the video signal, so that erroneous detection of the digital watermark information is prevented, and the video signal is reliably and accurately detected. Digital watermark information superimposed on a signal can be extracted.

In the above-described embodiment, in the reproducing apparatus, the WM determination unit 264 detects digital watermark information using a plurality of thresholds. However, the present invention is not limited to this. For example, if the video signal on which the digital watermark information is to be superimposed has little conversion and is known to have no correlation with the digital watermark information, the threshold value used in the WM determination unit 264 is used. Can, of course, use one threshold that is theoretically required.

In the above embodiment, the digital watermark information is superimposed every five vertical sections. That is, the superimposition / non-superimposition pattern of the electronic watermark information is made a regular pattern. However, the present invention is not limited to this, and the superimposed / non-superimposed pattern may be an irregular pattern.

As shown in FIG. 10, for example, a reset signal RE (FIG. 10 (B)) having a 60 vertical cycle is formed based on a vertical synchronization timing signal (FIG. 10 (A)). During this, an enable signal EN (FIG. 10C) for generating a PN code in a random pattern is generated. Further, based on the horizontal synchronization timing signal H,
A PN clock signal PNCLK (FIG. 10D) is generated.

Then, the reset signal RE, enable signal EN, and PN clock signal P
By using NCLK, as shown in FIG. 10E, when the enable signal EN is at a low level,
PN code strings PN (1), PN constituting the PN code string PS
(2), PN (3), PN (4),...

In this case, PN (2) and PN generated in the low level section of the enable signal EN are used.
(3), PN (4),... Generate a PN code sequence following the PN code sequence based on the PN clock signal PNCLK even in the non-generating section of the immediately preceding PN code sequence. I do.

That is, the PN code generation section 41 continues the PN code generation in the section where the enable signal EN is at the low level, even in the non-generation section of the PN code series immediately before that, when the PN code series is generated. In order to generate a column, a preset value to be preset is held in each shift register included in the PN generating unit 41, and this preset value is stored in each shift register of the PN generating unit 41 when the enable signal EN becomes low level. Preset in register. As a result, a PN code string is assigned even in a section where no PN code is generated.

The PN code string PS thus generated
By superimposing the digital watermark information formed by spread-spectrum-copying the control information on the video signal, the digital watermark information is superimposed on the first three vertical sections of the 60 vertical sections, and the next two vertical sections are superposed. In the section, the digital watermark information is not superimposed. In the next two vertical sections, the digital watermark information is superimposed. In the next three vertical sections, the digital watermark information is not superimposed.
Thus, the superimposed / non-superimposed pattern of the digital watermark information can be made an irregular pattern.

At the time of extracting the digital watermark information, a reset signal RE and a PN clock signal PNCLK for providing the same timing as when the digital watermark information is formed by spectrum-spreading the copy control information are formed. In the 60 vertical periods corresponding to the reset period, the enable signal EN for continuously generating the PN code is formed.

Using these signals, a PN code for despreading of the same sequence is generated at the same timing as in the spread spectrum, and despreading is performed using this. As described above with reference to FIGS. 6 and 7, the reset signal RE and the enable signal EN provide the video signal with the same timing as each signal used for the spread spectrum of the copy control information. The phases are adjusted.

As a result, the detection value obtained as a result of the despreading is determined in the section where the digital watermark information is superimposed.
Since a detection value at a higher level than that of a section in which digital watermark information is not superimposed is obtained, a superimposed / non-superimposed pattern of digital watermark information can be detected.

When the superimposition / non-superimposition pattern of the digital watermark information matches the predetermined irregular pattern, it can be determined that the digital watermark information is superimposed on the video signal. If the digital watermark information is superimposed on the video signal without causing erroneous detection, it can be reliably extracted and used.

By making the superimposition / non-superimposition pattern of the digital watermark information irregular, it is possible to make it more difficult to remove or falsify the digital watermark information. Can be further enhanced.

The irregular superimposition / non-superimposition pattern of the digital watermark information is stored in the memory of the control unit of the authoring device and the reproducing device, and is read out and used at the time of recording and reproducing the video signal. Or information about the irregular superimposed / non-superimposed pattern,
It is stored in a predetermined area of a DVD and used for recording or reproducing a video signal.

Further, in the reproducing apparatus, the superimposed / non-superimposed pattern of the digital watermark information can be determined to be an artificial pattern without holding the irregular superimposed / non-superimposed pattern itself of the digital watermark information. You can of course just keep it. For example, when the superimposed section and the non-superimposed section of the digital watermark information are repeated a plurality of times, it is of course possible to determine that the digital watermark information is superimposed on the video signal.

Further, in the authoring apparatus described above with reference to FIG. 1, by providing an interval for generating a PN code and an interval for not generating the PN code using the enable signal EN, Thus, a section in which digital watermark information is superimposed and a section in which digital watermark information is superimposed are provided. However, it is not limited to this.

For example, the PN code is reset at a predetermined cycle using the reset signal RE, but the PN code is generated in any video signal section. Then, a switch circuit is provided between the SS spreading section 42 and the level adjusting section 5 or between the level adjusting section 5 and the WM superimposing section 2, and a timing signal for forming this switch circuit using a video synchronization signal as a reference signal. , The superimposition section and the non-overlap section of the digital watermark information may be provided for the video signal.

In this case, for example, even if the superimposition / non-superimposition pattern of the digital watermark information is made irregular,
A stream without presetting a preset value to be prepared in advance in the shift register of the PN generating unit 41.
Also, in a device such as a playback device that extracts digital watermark information superimposed on a video signal, the same sequence of PNs is used at the same timing as when the spread control information is spread spectrum.
By generating a code and performing despreading using the PN code, digital watermark information can be extracted.

Also in this case, by detecting the superimposition / non-superposition pattern of the digital watermark information, it is possible to reliably determine whether the digital watermark information is superimposed on the video signal, and to perform erroneous detection. The digital watermark information can be extracted from only the video signal on which the digital watermark information is superimposed without performing the above.

Also, in this case, a plurality of thresholds are used for extracting the digital watermark information.
When the difference between the average of the detected values determined to be plus (+) and the average of the detected values determined to be negative (−) to the threshold to be used is equal to or larger than a predetermined value S, the image is displayed. If it is determined that digital watermark information is superimposed on a signal, erroneous detection of digital watermark information can be reliably prevented.

[Second Embodiment] Next, a video signal transmission system, a video signal output device, a video signal processing device, and a video signal transmission method used in the video signal transmission system according to the second embodiment of the present invention will be described. An embodiment will be described. Also in the second embodiment, the description will be made assuming that the video signal transmission system according to the present invention is composed of an authoring device that records a video signal on a DVD and a DVD playback device.

The authoring apparatus according to the second embodiment described below superimposes the digital watermark information on the video signal in such a manner that the phase of the digital watermark information is inverted in a predetermined pattern. That is, in the authoring apparatus according to the second embodiment, the digital watermark information having a positive value and the digital watermark information having a negative value are superimposed in a predetermined pattern.

[Regarding Authoring Apparatus] FIG.
It is a block diagram for explaining the authoring device (video signal recording device) of the second embodiment. This second
The authoring apparatus according to the second embodiment records a video signal on a DVD in the same manner as the authoring apparatus according to the first embodiment described above with reference to FIG.

For this reason, in the authoring apparatus of the second embodiment, parts similar to those of the authoring apparatus shown in FIG. 1 are included in the parts of the authoring apparatus of the first embodiment shown in FIG. The same reference numerals are given to the corresponding parts, and the description is omitted.

As shown in FIG. 11, the authoring apparatus of this embodiment comprises an input terminal 1 for a video signal, a WM superimposition unit 2, a timing control unit 3, a level adjustment unit 5, a data compression processing unit 6, a CGMS information addition It comprises a unit 7, a CGMS information generating unit 8, an encrypting unit 9, a recording processing unit 10, and a spread spectrum processing unit 12.

As shown in FIG. 11, the spectrum spreading section 12 includes a PN generating section 41, an SS spreading section 42, a copy control information generating section 43 and a PN inverting section 121. That is, except that the PN inverting unit 121 is provided between the PN generating unit 41 and the SS spreading unit 42, as in the case of the spectrum spreading processing unit 4 of the authoring apparatus of the first embodiment described above. It is composed.

The timing control unit 3 according to the second embodiment is the same as the timing control unit 3 in the authoring apparatus according to the first embodiment described with reference to FIG. In the second embodiment,
The timing signal generator 323 of the timing controller 3 forms an inversion timing signal HT, which will be described later, and supplies this to the PN inversion unit 121 of the spread spectrum processing unit 12.

In the authoring apparatus shown in FIG. 11, the video signal to be recorded on the DVD 100 is
The signal is supplied to the WM superimposition unit 2 and the synchronization detection unit 31 of the timing control unit 3 through the input terminal 1. Synchronization detector 31
Detects the vertical synchronizing timing signal V and the horizontal synchronizing timing signal H from the video signal, and supplies the detected output to each unit of the PN generation control unit 32.

The PN generation control unit 32 uses the vertical synchronizing timing signal V and the horizontal synchronizing timing signal H as reference signals, and sets a reset signal RE and an enable signal EN.
Alternatively, a clock signal PNCLK is generated. In the second embodiment, as in the case of the first embodiment described above, the PN generation timing signal generation unit 321 and the timing signal generation unit 323 include the horizontal synchronization timing signal from the synchronization detection unit 31. H and the vertical synchronization timing signal V are supplied, and the horizontal synchronization timing signal H from the synchronization detection unit 31 is supplied to the PN clock generation unit 322.

The PN generation timing signal generator 3
Reference numeral 21 denotes a vertical period reset signal RE (FIG. 12B) that determines a repetition period of a spreading PN code sequence used for spread spectrum using a vertical synchronization timing signal V (see FIG. 12A) as a reference signal. ) And a PN generation enable signal EN (FIG. 12C). This second
In the embodiment, the reset signal RE is a signal of five vertical periods falling at, for example, the leading edge of the vertical synchronization timing signal V, and the PN generation enable signal EN is low active.

The PN clock generation unit 322 generates a PN clock PNCLK (FIG. 12D) synchronized with the horizontal synchronization timing signal H using a PLL. Further, the timing signal generator 323 outputs the vertical synchronization timing signal V
Various timing signals used in the authoring apparatus of FIG. 1 are generated based on the horizontal synchronizing timing signal H. In the second embodiment, as shown in FIG. A PN inverted signal HT whose phase is inverted is formed every (5 frames).

As shown in FIG. 11, the reset signal RE, the enable signal EN, and the PN clock signal PNCL among the signals generated in the timing control section 3 are shown.
K is supplied to the PN generator 41, and the enable signal EN and the PN clock signal PNCLK are also supplied to the copy control information generator 43. Also, the PN inverted signal HT,
The PN clock signal PNCLK is supplied to the PN inverting unit 121.

The PN generator 41 outputs a reset signal RE,
The PN code is generated according to the enable signal EN and the clock signal PNCLK. That is, the PN generator 41
Are reset by a reset signal RE in this example at five vertical periods, and generate a PN code sequence PN1 of a predetermined code pattern from the beginning. When the PN code generation unit 41 is set to the PN code generation enabled state (enable state) by the enable signal EN, the PN code generation unit 41 responds to the clock signal PNCLK as shown in FIG. A PN code sequence PS composed of a sequence PN1 is generated and supplied to the PN inversion unit 121.

The PN inverting section 121 inverts the phase of the PN code string PS from the PN generating section 41 in accordance with the PN inverted signal HT. That is, in the second embodiment, the phase of the PN code string PS is inverted every five vertical periods. As a result, as shown in FIG.
The phase of the PN code sequence PN1 reset at five vertical periods is inverted every five vertical intervals.

That is, in the PN inversion section 121,
Based on the PN inversion signal HT, as shown in FIG. 12G, the PN code string PN1 (+) having a positive value and a PN code string having a negative value in which the phase is inverted every five vertical sections. PN1
An inverted PN code string PSh in which (−) is alternately formed is formed, and this is supplied to the SS spreading section 42.

On the other hand, the copy control information generator 43 forms the copy control information sequence FS at the same timing as the PN code sequence PS based on the clock PNCLK at the timing of the enable signal EN from the timing controller 3. Are supplied to the SS diffusion unit 42.

Also in the second embodiment, the copy control information generating section 43 generates copy control information according to a video signal to be recorded on the DVD 100 under the control of a control section (not shown). In this case, low-bit-rate copy control information indicating which copy control state is possible, that is, duplication is impossible, duplication is not possible, and only one generation can be duplicated, is generated.

[0168] The SS spreading section 42 is
3 is spread using the PN code string PSh from the PN inverting unit 121 to form digital watermark information (SS copy control information) to be superimposed on the video signal input through the input terminal 1. .

The digital watermark information formed in the SS spreading section 42 is supplied to the WM superimposing section 2 through the level adjusting section 5. Then, the WM superimposing unit 2 superimposes the digital watermark information whose level has been adjusted by the level adjusting unit 5 on the video signal input through the input terminal 1.

[0170] The video signal on which the digital watermark information is superimposed is recorded on the DVD 100 through the data compression processing unit 6, the CGMS addition unit 7, the encryption unit 9, and the recording processing unit 10. In this case, on the video signal recorded on the DVD 100, as described above, digital watermark information formed by spectrum spreading with the PN code string PSh whose phase is inverted at 5 vertical periods is superimposed. .

For this reason, in a reproducing apparatus for reproducing a video signal recorded on a DVD,
Reset signal RE, enable signal EN, PN clock signal P providing the same timing as in spread spectrum
An NCLK is formed, a PN code sequence of the same sequence is generated at the same timing as in the spread spectrum, and despreading is performed using this PN code sequence. In this case, it is not necessary to reverse the phase of the PN code sequence for despreading in a predetermined pattern as in the case of spectrum spreading.

Therefore, a reproducing apparatus for reproducing a video signal from a DVD on which a video signal on which digital watermark information is superimposed is recorded by the authoring apparatus of the second embodiment is provided by the reproducing apparatus described with reference to FIG. The digital watermark information can be reproduced, and the digital watermark information superimposed on the video signal to be reproduced can be extracted and used.

That is, when the video signal on which the digital watermark information is superimposed is despread by using the same sequence of PN code strings generated at the same timing as in the spread spectrum, the detected output is as shown in FIG. As shown in (1), a detection value having a positive value and a detection value having a negative value appear alternately every five vertical intervals.

For this reason, in the WM judging section 264 of the reproducing apparatus, a detection value having a positive value and a detection value having a negative value are detected from the detection output from the despreading section 263 every five vertical intervals. By detecting whether or not they appear alternately, it is possible to detect whether or not digital watermark information is superimposed on the video signal.

Note that, also in this case, the reset signal RE and the enable signal EN formed in the reproducing device are provided.
As described above with reference to FIGS. 6 and 7, the phase of the video signal is adjusted so as to provide the same timing as each signal used for the spread spectrum of the copy control information.

In the second embodiment, of the detection values obtained as a result of despreading, a positive threshold (+ TH) for a detection value having a positive value and a negative value Negative threshold (-T
H), the copy control information can be extracted and the copy control state can be determined regardless of whether the detected value is positive or negative.

Of course, it is also possible to provide a plurality of thresholds and use them to detect the copy control information and determine the copy control state. Further, as in the case of the playback device of the first embodiment, of the detection output from the despreading unit 263, the average of the detection values determined as plus (+) and the minus ( When the difference from the average of the detected values determined as −) is equal to or greater than a predetermined value S, it is determined that the digital watermark information is superimposed on the video signal, so that more reliable electronic The presence or absence of watermark information can be determined.

The pattern of the phase inversion may be not only a regular pattern but also an irregular pattern. For example, as shown in FIG. 14, for example, based on a vertical synchronization timing signal (FIG. 14A), a reset signal RE of 60 vertical cycles (FIG. 14B) and an enable signal for generating a PN code. The signal EN (FIG. 14)
(C)). Further, based on the horizontal synchronization timing signal H, a PN clock signal PNCLK (FIG.
(D)).

Then, the reset signal RE, enable signal EN, and PN clock signal P
By using NCLK, a PN code string PS is formed as shown in FIG. Then, for example, a PN inverted signal HT formed based on the vertical synchronization timing signal V is formed, and the PN inverted signal HT is used to generate a PN inverted signal.
The phase of the code string PS is inverted in a predetermined pattern.

In this example, the PN code string PS is inverted in an irregular pattern by inverting the phase of the PN code string PS in a section in which the PN inverted signal HT is at a low level. This PN code string PS
By superimposing the digital watermark information formed by spread-spectrum duplication control information using h on the video signal, the first three vertical sections out of the 60 vertical sections include:
The digital watermark information of a positive value is superimposed, and the next two vertical sections are
The digital watermark information of a negative value is superimposed, the digital watermark information of a positive value is superimposed on the next two vertical sections, and the digital watermark information of a negative value is superimposed on the next three vertical sections. In addition, the pattern of the phase inversion of the digital watermark information can be made an irregular pattern.

As described above, by making the pattern of the phase inversion of the digital watermark information irregular, it becomes more difficult to remove or falsify the digital watermark information. Sex can be further enhanced.

Even if the phase inversion pattern of the digital watermark information is made an irregular pattern, the same timing as when the copy control information is spectrum-spread and the digital watermark information is formed at the time of extracting the digital watermark information. A reset signal RE, an enable signal EN, and a PN clock signal PNCLK to be provided are formed, and these signals are used to
By generating a despreading PN code of the same sequence at the same timing as in the spread spectrum, it is possible to extract and use the copy control information superimposed on the video signal as digital watermark information. .

The pattern of the phase inversion of the digital watermark information may be stored in the memory of the control unit of the authoring device or the reproducing device, or may be stored in a predetermined area of the DVD, and may be stored in the video signal. It can be used at the time of recording or reproduction.

Further, the timing control section 261 of the reproducing apparatus
The PN inversion signal HT formed in the WM determination unit 26
4 and the PN inversion signal HT allows the WM determination unit 264 to determine whether the detection output from the despreading unit 263 is a detection output from a section in which digital watermark information of any phase is superimposed. The determination can be made.

In the authoring apparatus described above with reference to FIG. 11, the PN inversion signal HT is used to
By inverting the phase of the code, the phase of the digital watermark information formed by multiplying the PN code is also inverted. However, it is not limited to this.
For example, in a stage before superimposing digital watermark information formed by multiplying a PN code on a video signal,
The polarity may be changed by inverting the phase.

In the first and second embodiments, the video signal output device according to the present invention is applied to an authoring device, and the video signal processing device is applied to a reproducing device. However, it is not limited to this.

A video signal output device according to the present invention can be used as a broadcast device for transmitting a broadcast signal from a broadcast station, a so-called DVD recording / reproducing device used at home, a video signal recording device such as a VTR (video tape recorder), or a video signal recording device. The present invention can be applied to a recording / reproducing device, etc. That is, the video signal output device of the present invention can be applied to various devices that superimpose digital watermark information on a video signal and output the resultant signal.

Further, the video signal processing device according to the present invention can be applied to, for example, a receiver called a set-top box which receives a digital broadcast and supplies it to a monitor receiver or a recording device. That is, the present invention can be applied to various video signal processing devices having a function of extracting a digital watermark information from the supplied video signal in response to the supply of the video signal on which the digital watermark information is superimposed.

When the video signal on which the digital watermark information is superimposed is a digital signal, the digital watermark information is superimposed on the digital signal before MPEG encoding, as described above. However, it can of course be superimposed on the digital video signal after MPEG encoding.

In the first and second embodiments described above, the enable signal EN and the inversion timing signal HT are supplied to the WM determination unit 264 of the playback device, so that the WM determination unit 264 Also, it is possible to know a superimposition / non-superposition pattern of electronic watermark information and a pattern of phase inversion, but the present invention is not limited to this. Of course, the duplication control information sequence FS from the despreading unit 263 may be counted to detect a superimposed / non-superimposed pattern of digital watermark information or a phase inversion pattern.

In the first and second embodiments, the superimposition / non-superposition pattern of the digital watermark information or the pattern of the phase inversion is determined using the vertical synchronization timing signal as the reference signal. However, it is not limited to this. Using a horizontal synchronization timing signal as a reference signal, a superimposition / non-superimposition pattern of digital watermark information,
Alternatively, the phase inversion pattern may be determined regularly or irregularly.

Further, even when the superimposition / non-superimposition pattern of the digital watermark information or the phase inversion pattern is a regular pattern, as in the first and second embodiments described above, 5 Instead of using the vertical cycle (5 frames) as a reference unit, digital watermark information is superimposed every other frame or every other frame, or the phase of the digital watermark information is inverted every frame or every plural frames. Of course, you can do it. In other words, the period serving as a reference for phase inversion of digital watermark information, with or without digital watermark information being superimposed, can be set arbitrarily.

Also, in the above-described embodiment, the recording medium on which the video signal is recorded by the authoring device is
Although described as VD, the present invention is not limited to this, and the present invention can also be applied to an authoring apparatus using a video tape, a magnetic disk, an optical disk, a magneto-optical disk, or the like as a recording medium.

The digital watermark information is not limited to copy control information, but may be, for example, copyright information. If the digital watermark information to be superimposed on the video signal is copyright information or the like, by detecting this, it is possible to use the information to track or detect illegal duplicators.

The spread code for spectrum-spreading the additional information is not limited to the PN code, and various spread codes can be used.

[0196]

As described above, according to the video signal transmission system of the first aspect of the present invention, the spread spectrum signal is superimposed on the video signal so as to generate a superimposed section and a non-superimposed section. By doing so, it becomes difficult to remove or falsify the spread spectrum signal, and the spread spectrum signal superimposed on the video signal can be transmitted more reliably.

Further, even when there is a relatively high correlation between the video signal and the spread spectrum signal (digital watermark information) to be superimposed on the video signal, the superimposition / non-superposition pattern of the spread spectrum signal is determined. By detecting, it is possible to reliably detect whether or not the spread spectrum signal is superimposed on the video signal, and without causing erroneous detection of the spread spectrum signal, the spread spectrum signal superimposed on the video signal is detected. It is possible to reliably detect the content, determine the content, and use the content.

According to the video signal transmission system of the second aspect of the present invention, a superimposed section and a non-superimposed section of a spread spectrum signal cannot be easily distinguished from each other. Falsification or removal of the signal becomes difficult, and the reliability of the transmission system that transmits the spread spectrum signal by superimposing it on the video signal can be further improved.

According to the video signal transmission system of the third aspect of the present invention, even if there is a relatively high correlation between the video signal and the spread spectrum signal superimposed on the video signal. In the case where a spread spectrum signal is superimposed on a video signal, additional information can be reliably detected by using a threshold (threshold) suitable for detection of additional information, and its content can be determined.

According to the video signal transmission system of the present invention, it is reliably detected whether or not a spread spectrum signal is superimposed on a video signal, and erroneous detection of a spread spectrum signal is reliably prevented. can do.

According to the video signal transmission system of the fifth aspect of the present invention, a section in which a spread spectrum signal is superimposed on a video signal as it is, and a phase of the spread spectrum signal are inverted and superimposed. Since the sections are superimposed so as to be generated, it is difficult to remove or falsify the spread spectrum signal, and the spread spectrum signal superimposed on the video signal can be transmitted more reliably.

Further, even if there is a relatively high correlation between the video signal and the spread spectrum signal (digital watermark information) superimposed on the video signal, the phase inversion pattern of the spread spectrum signal is detected. By doing so, it is reliably detected whether or not the spread spectrum signal is superimposed on the video signal, and the spread spectrum signal superimposed on the video signal can be reliably detected without causing erroneous detection of the spread spectrum signal. To determine the content and use it.

Further, according to the video signal transmission system of the present invention, a section in which the spread spectrum signal is superimposed as it is and a section in which the spread spectrum signal is inverted in phase and superposed. And makes it difficult to identify them easily, making it difficult to falsify or remove the spread spectrum signal, and improving the reliability of the transmission system that transmits the spread spectrum signal by superimposing it on the video signal. it can.

Further, according to the video signal transmission system of the present invention, even when there is a relatively high correlation between the video signal and the spread spectrum signal superimposed on the video signal. In the case where a spread spectrum signal is superimposed on a video signal, additional information can be reliably detected by using a threshold (threshold) suitable for detection of additional information, and its content can be determined.

Further, according to the video signal transmission system of the present invention, whether or not a spread spectrum signal is superimposed on the video signal is reliably detected, and erroneous detection of the spread spectrum signal is reliably prevented. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining an authoring device (video signal recording device) to which an embodiment of a video signal output device constituting a video signal transmission system according to the present invention is applied.

FIG. 2 is a block diagram for explaining a timing control unit 3 shown in FIG.

FIG. 3 is a diagram for explaining various timing signals formed by a timing control unit and a PN code string generated by using the signals.

FIG. 4 is a diagram for explaining a relationship among an information signal, copy control information, and spread-spectrum copy control information.

FIG. 5 is a block diagram for explaining a video signal reproducing device to which an embodiment of a video signal processing device constituting the video signal transmission system according to the present invention is applied;

FIG. 6 is a diagram for explaining the WM decoding unit 26 shown in FIG.

FIG. 7 is a diagram for explaining the timing control unit 261 shown in FIG.

FIG. 8 is a diagram for explaining detection output of digital watermark information obtained as a result of despreading.

FIG. 9 is a diagram for explaining detection output of digital watermark information obtained as a result of despreading and a plurality of thresholds used for detecting digital watermark information.

FIG. 10 is a diagram for explaining a case where a superimposed / non-superimposed pattern of digital watermark information is an irregular pattern.

FIG. 11 is a block diagram for explaining another example of an authoring device (video signal recording device) to which an embodiment of the video signal output device constituting the video signal transmission system according to the present invention is applied.

FIG. 12 shows various timing signals formed by a timing control unit and a PN generated by using these signals.
It is a figure for explaining a code sequence.

FIG. 13 is a diagram for explaining detection output of digital watermark information obtained as a result of despreading.

FIG. 14 is a diagram for explaining a case where a phase inversion pattern of digital watermark information is an irregular pattern.

FIG. 15 is a diagram for describing a detection value obtained by performing despreading on a video signal on which digital watermark information formed by spectrum spreading is superimposed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input terminal 1, 2 ... WM superposition part, 3 ... Timing control part, 4 ... Spread spectrum processing part, 5 ... Level adjustment part,
6 Data compression processing unit 7 CGMS information adding unit 8
CGMS information generation unit, 9 encryption unit, 10 recording processing unit, 41 PN generation unit, 42 SS spreading unit, 43 duplication control information generation unit, 31 synchronization detection unit, 32 PN generation control unit, 321... PN generation timing signal generator 322
.. PN clock signal generation section, 323 timing signal generation section 323, 21... Reading section, 22... Descrambling section, 23... Video data decoding section, 24... D / A conversion circuit, 24a. , 25 ...
CGMS decoding unit, 26WM decoding unit, 27 ... encryption unit, 28 ... IEEE1394 interface, 28
d: digital video signal output terminal, 30: control unit, 31: key operation unit, 261: timing control unit, 2
62 PN generating section, 263 despreading section, 264 WM determining section, 121 PN inverting section

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04L 9/36 (72) Inventor Takashi Kobashi 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72 ) Inventor Yuji Kimura 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo, Japan Sony Corporation (72) Inventor Hisayoshi Moriwaki 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 5C063 AB05 AC01 AC05 AC10 CA00 CA40 DA13 DB02 5J104 AA14 NA30 PA07 PA14 5K022 EE01 EE22 EE32 5K028 AA15 EE03 KK01 KK24 MM12 SS07 SS17

Claims (24)

[Claims] An image comprising: a video signal output device for outputting a video signal on which additional information is superimposed; and a video signal processing device having a function of detecting the additional information from the video signal from the video signal output device. A signal transmission system, wherein the video signal output device includes: a spread spectrum unit configured to generate a spread spectrum signal in which additional information is spread spectrum by a spread code; and superimposing the spread spectrum signal from the spread spectrum unit on the video signal. Superimposing means, and controlling generation of the spread code in synchronization with a video synchronization signal, and controlling generation of the spread spectrum signal so as to generate a section to be superimposed and a section to be non-superimposed on the video signal. Wherein the superimposed / non-superimposed pattern of the spread spectrum signal is a predetermined pattern. The video signal processing device performs despreading using a spreading code for despreading, and is spectrum-spread to the video signal supplied from the video signal output device. Despreading means for extracting the superimposed additional information; timing control means on the processing device side for generating and controlling the spreading code for despreading in synchronization with a video synchronization signal; and A video signal transmission system comprising: an additional information determining unit that receives the detection output of (i) and determines the additional information that is spread spectrum and superimposed on the video signal. 2. The video signal transmission system according to claim 1, wherein said superimposed / non-superimposed pattern of said spread spectrum signal is an irregular pattern. 3. The video signal processing apparatus according to claim 2, wherein said additional information determination means includes N (N is an integer of 1 or more) threshold values for detecting additional information, and further comprises a detection output from said despreading means, The video according to claim 1 or 2, wherein the determination of the additional information, which is spectrum-spread and superimposed on the video signal, is performed using each of the N thresholds. Signal transmission system. 4. An apparatus according to claim 1, wherein said additional information discriminating means of said video signal processing device includes: an average value of detection outputs in a superimposition section of the spread spectrum signal, among the detection outputs from said despreading means; When the difference between the average value of the detection output in the section and the average value is equal to or more than a predetermined value, it is detected that the spread spectrum signal is superimposed on the supplied video signal. The video signal transmission system according to claim 1. 5. An image comprising: a video signal output device for outputting a video signal on which additional information is superimposed; and a video signal processing device having a function of detecting the additional information from the video signal from the video signal output device. A signal transmission system, wherein the video signal output device includes: a spread spectrum unit configured to generate a spread spectrum signal in which additional information is spread spectrum by a spread code; and superimposing the spread spectrum signal from the spread spectrum unit on a video signal. Superimposing means for controlling the generation of the spread code in synchronization with a video synchronization signal, and a section in which the spread spectrum signal is superimposed on the video signal as it is and a section in which the phase is inverted so as to invert the phase. And a pattern for phase inversion of the spread spectrum signal. The video signal processing device performs despreading using a spreading code for despreading, and supplies the video signal from the video signal output device. Despreading means for extracting the additional information superimposed on the video signal; timing control means on a processing device side for generating and controlling the despreading spread code in synchronization with a video synchronization signal; A video signal duplication control system comprising: an additional information determining unit that receives the detection output from the despreading unit and determines the additional information that is spectrally spread and superimposed on the video signal. 6. The video signal transmission system according to claim 5, wherein the phase inversion pattern of the spread spectrum signal is an irregular pattern. 7. The video signal processing apparatus, wherein the additional information discriminating means includes N (N is an integer of 1 or more) thresholds for detecting additional information, and a detection output from the despreading means, 7. The video signal transmission system according to claim 5, wherein the additional information that is spectrum-spread and superimposed on the video signal is determined using each of the N thresholds. 8. . 8. The video signal processing apparatus according to claim 1, wherein said additional information determination means includes: an average value of detection outputs in a section where the spread spectrum signal is superimposed as it is, among the detection outputs from the despreading means; A spread spectrum signal is superimposed on the supplied video signal when the difference between the average value of the detection outputs in a section in which the spread signal is inverted and superimposed is greater than or equal to a predetermined value. 6. The method according to claim 5, further comprising:
Or the video signal transmission system according to claim 6. 9. A spread spectrum means for generating a spread spectrum signal in which the additional information is spread spectrum by a spread code; a superimposing means for superimposing the spread spectrum signal from the spread spectrum means on a video signal; The generation control is performed in synchronization with the synchronization signal, and the generation control is performed so as to generate a section in which the spread spectrum signal is superimposed on the video signal and a section in which the spread spectrum signal is not superimposed. A video signal output device comprising: timing control means for controlling a superimposed / non-superimposed pattern to be a predetermined pattern. 10. The superposition / superimposition of the spread spectrum signal.
The video signal output device according to claim 9, wherein the non-overlapping pattern is an irregular pattern. 11. A spread spectrum means for generating a spread spectrum signal in which additional information is spread spectrum by a spread code, a superimposing means for superimposing the spread spectrum signal from the spread spectrum means on a video signal, and Generation control in synchronization with a synchronization signal, and generation control of generating a section in which the spread spectrum signal is superimposed on the video signal as it is and a section in which the phase is inverted so as to be inverted. A video signal output device, comprising: timing control means for controlling a phase inversion pattern of the spread spectrum signal to be a predetermined pattern. 12. The video signal output device according to claim 11, wherein the pattern of the phase inversion of the spread spectrum signal is an irregular pattern. 13. A spread-spectrum signal, which has been subjected to spread-spectrum by a spreading code in which additional information is generated in synchronization with a video synchronizing signal, is superposed so as to generate a superimposed section and a non-superimposed section. A video signal processing device that receives the supply of a video signal and extracts the additional information that is spectrum-spread and superimposed on the video signal, performs despreading using a spreading code for despreading, and supplies Despreading means for extracting additional information superimposed on the video signal, timing control means for generating and controlling the spread code for despreading in synchronization with a video synchronization signal, and N (N: (Integer of 1 or more) thresholds for detecting additional information are set, and a spectrum spread is applied to the video signal using the detection output from the despreading means and each of the N thresholds. A video signal processing apparatus characterized by comprising an additional information determining means for discriminating the additional information superimposed Te. 14. A spread-spectrum signal obtained by subjecting additional information to a spread-spectrum code in synchronization with a video synchronizing signal, is superimposed so as to generate a superimposed section and a non-superimposed section. A video signal processing device that receives the supply of a video signal and extracts the additional information that is spectrum-spread and superimposed on the video signal, performs despreading using a spreading code for despreading, and supplies A despreading means for extracting additional information superimposed on the video signal, a timing control means for controlling generation of the despreading spread code in synchronization with a video synchronization signal, and Difference between the average value of the detection output in the superimposed section of the spread spectrum signal and the average value of the detection output in the non-superimposed section of the spread spectrum signal. When the value is equal to or more than a predetermined value, it is determined that the supplied spectrum signal is superimposed with the spread spectrum signal, and the determination of the additional information that is spread and superimposed on the video signal is performed. A video signal processing device comprising: 15. A section in which a spread spectrum signal that has been subjected to spectrum spreading by a spreading code in which additional information is generated in synchronization with a video synchronization signal is superimposed as it is, and a section in which the phase is inverted so as to be superimposed. A video signal processing apparatus for receiving the supply of a video signal superimposed so as to generate the additional information, which is spectrum-spread and superimposed on the video signal, using a spreading code for despreading. Despreading means for performing despreading and extracting additional information superimposed on the supplied video signal, and timing control for generating and controlling the despreading spread code in synchronization with a video synchronization signal Means, N (N is an integer of 1 or more) thresholds for detecting additional information are set, and a detection output from the despreading means and each of the N thresholds are used. A video signal processing apparatus characterized by comprising an additional information determining means for discriminating the additional information superimposed to the spectrally spread to the video signal. 16. A section in which a spread spectrum signal, which has been subjected to spectrum spreading by a spreading code in which additional information is generated in synchronization with a video synchronization signal, is superimposed as it is, and a section in which the phase is inverted so as to be superposed. A video signal processing apparatus for receiving the supply of a video signal superimposed so as to generate the additional information, which is spectrum-spread and superimposed on the video signal, using a spreading code for despreading. Despreading means for performing despreading and extracting additional information superimposed on the supplied video signal, and timing control for generating and controlling the despreading spread code in synchronization with a video synchronization signal Means, of the detection outputs from the despreading means, an average value of the detection outputs in a section where the spread spectrum signal is superimposed as it is, When the difference between the detected value and the average value of the detection output in the section where the phase spread signal is inverted and superimposed is greater than or equal to a predetermined value, the spread spectrum signal is superimposed on the supplied video signal. A video signal processing device comprising: an additional information determining unit that determines that the additional information has been spread and is superimposed on the video signal by spectrum spreading and superimposed. 17. A video signal in which additional information is superimposed and transmitted.
A video signal transmission method for extracting the additional information superimposed on the video signal on a receiving side of the supply of the video signal, wherein a spreading code for generating the additional information in synchronization with a video synchronization signal is provided. Spread spectrum using to form a spread spectrum signal, the spread spectrum signal is superimposed on the video signal so as to generate a superimposed section and a non-superimposed section, and transmitted. On the receiving side of the supply, the supplied video signal is despread using a spreading code for despreading generated in synchronization with a video synchronization signal, and is then spread and superimposed on the video signal. A video signal transmission method, wherein the additional information is extracted and the additional information is determined. 18. A method of superimposing / adding additional information formed by a section in which a spread spectrum signal is superimposed and a section in which a spread spectrum signal is not superimposed.
18. The video signal transmission method according to claim 17, wherein the non-overlapping pattern is an irregular pattern. 19. On the receiving side of the supply of the video signal, N (N is an integer of 1 or more) threshold values for detecting additional information are set in advance, and a detection value obtained as a result of despreading is set to a threshold value. 18. The method according to claim 17, wherein each of the N additional information detection thresholds is used to determine the additional information that has been spectrally spread and superimposed on the video signal. 19. The video signal transmission method according to 18. 20. On the receiving side of the supply of the video signal, of the detection values obtained as a result of the despreading, an average value of the detection values in a superimposed section of the spread spectrum signal;
When the difference between the average value of the detection values in the non-overlapping section of the spread spectrum signal and the average value is equal to or larger than a predetermined value, it is determined that the spread spectrum signal is superimposed on the supplied video signal. 18. The method of claim 17, wherein
19. The video signal transmission method according to claim 18, wherein: 21. A video signal with additional information superimposed thereon and transmitted.
A video signal transmission method for extracting the additional information superimposed on the video signal on a receiving side of the supply of the video signal, wherein the additional information is added using a spreading code generated in synchronization with a video synchronization signal. The information is spectrum-spread, and the spectrum-spread additional information is superimposed on the video signal so as to generate a section to be superimposed as it is and a section to be superimposed so as to invert the phase, and transmitted. On the receiving side of the signal supply, the supplied video signal is subjected to despreading using a despreading spreading code generated in synchronization with a video synchronization signal, and is subjected to spectrum spreading to the video signal. A video signal transmission method, wherein the additional information is superimposed and extracted, and the additional information is determined. 22. The spectrum-spread additional information,
22. The video signal transmission according to claim 21, wherein a phase inversion pattern of the additional information formed by the section that is superimposed as it is and the section that is superimposed by inverting the phase is an irregular pattern. Method. 23. A receiving side of the supply of the video signal, the supplied video signal is subjected to despreading using a spreading code for despreading generated in synchronization with a video synchronizing signal, Discrimination of additional information superimposed on the video signal is performed by using a detection value obtained as a result of despreading and N (N is an integer equal to or greater than 1) preset thresholds for detecting additional information. 23. The video signal transmission method according to claim 21, wherein the video signal transmission is performed. 24. On the receiving side of the supply of the video signal, among detection values obtained as a result of despreading, an average value of detection outputs in a section where the spread spectrum signal is superimposed as it is, and When the difference from the average value of the detection output in the section where the signal is inverted and superimposed is greater than or equal to a predetermined value,
23. The video signal transmission method according to claim 21, wherein it is determined that a spread spectrum signal is superimposed on the supplied video signal.