JP2000152196A - Transmission method for additional information of video signal, output device for video signal, reproducing device, recorder and signal converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method where illegal forgery is difficult and that has conformity for even a high vision signal for a method to superimpose CGMS (copy generation management system)-A (analog video signal) information on an analog video signal. SOLUTION: One-bit information is represented by a pulse that is inserted to a horizontal period before or after a vertical synchronizing signal in a vertical blanking period of a video signal, and additional information is transmitted by using a plurality of bits of the one-bit information as one packet. The additional information in one packet includes at least CGMS-A information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transmitting additional information such as CGMS information for limiting the generation of a copy of an analog video signal, and a video signal output apparatus, a reproduction apparatus, and a recording apparatus to which the transmission method is applied. The present invention relates to a device and a signal conversion device.

[0002]

2. Description of the Related Art In recent years, with the spread of digital contents such as the Internet and digital video discs, there has been a problem of copyright infringement due to unauthorized duplication (copy) of the digital contents. In order to cope with this problem, it has been considered to add information for copy control to the digital content, and to prevent unauthorized duplication by using the additional information.

[0003] The control for preventing the duplication includes a case where the duplication is not permitted at all according to the information source and a case where the duplication is permitted once but the duplication from the one-time duplication is prohibited ( Generation control). The former is the case of original software created and sold by a content maker, such as a DVD-ROM. The latter generation-limited copy control method is applied to, for example, broadcast information in broadcast media.

[0004] In the latter case of the copy control system with generation limitation, a system capable of effectively controlling the copy generation is desired. As a method of the copy control information capable of managing the copy generation, CGMS (Copy Generation) is used.
2. Description of the Related Art A management system (copy generation management system) has been proposed.

In the CGMS system, if an analog video signal (referred to as CGMS-A) is used, a specific one horizontal section within a vertical blanking period of the luminance signal, for example, N
In the case of the TSC signal, two bits of the 20-bit additional information to be superimposed on the effective video portion in the twentieth horizontal section are superimposed as duplication control information, and a digital video signal (referred to as CGMS-D). If this is the case, the transmission method includes 2-bit information for duplication control as additional information to be inserted and added to digital video data.

In the vertical blanking period of the analog video signal, for example, information on the aspect ratio is superimposed on the first two bits (word 0) of the 20-bit additional information in the twentieth horizontal section. The next 4 bits (word 1) are a header. When these 4 bits are “0000”, the next 8 bits (word 2) indicate a copy control signal. The last 6 bits are a CRCC (Error Detection Code).

The information of the CGMS-A is two bits of the first two bits of the word 2 (the seventh and eighth bits of the 20-bit additional information). The meaning of the 2-bit information for CGMS-A duplication control (hereinafter referred to as CGMS-A information) is [00]... Duplicatable [10]... Duplicatable once (only one generation can be duplicated) [11]... Duplication is prohibited (absolute duplication is prohibited).

[0008] When the CGMS-A information added to the video information is [10], the CGMS-compatible recording device determines that the video information can be copied and recorded, and executes the recording. The CGMS-A information rewritten to [11] is added to the recorded video signal. The CGMS- added to the video information to be recorded
When the A information is [11], the CGMS-compatible recording apparatus prohibits the duplication recording of the video signal and prohibits the execution of the recording.

The third and fourth bits of word 2
In the bit (the ninth and tenth bits of the 20-bit additional information), APS (Analog Protection System) information is defined. This is for controlling the insertion of a pseudo sync pulse for AGC control and for controlling the inversion burst for color stripe to prevent duplication of an analog video signal.

[0010] The CGMS-A system is standardized, and is actually used as a copy control signal at the time of analog connection between digital devices in the NTSC signal.

In the case of a 525P video signal, that is, a 525-scanning-line, 60-frame sequential scanning signal, the 41st of the vertical blanking period of the luminance signal is used.
It is set as a standard that the same 20-bit additional information as described above is superimposed on the effective video portion of the horizontal section. However, there is no 525P-compatible recording device at present, so the standard exists. Only. How to apply the CGMS-A method to a high-definition signal has not yet been set even in the standard.

[0012]

SUMMARY OF THE INVENTION As described above, CG
Conventionally, the MS-A information is transmitted as a part of a plurality of bits of additional information that is superimposed on one specific horizontal section (in the case of an NTSC signal, the 20th horizontal section) of a vertical blanking period. For this reason, for example, in the case of the NTSC signal, duplication is prohibited only by extracting the information of the twentieth horizontal section on which the additional information is superimposed, and rewriting the 2-bit duplication control information portion. There is a problem that the video information can be falsified so that it can be copied, and falsification is relatively easy.

[0013] Further, the current system for transmitting CGMS-A information is an NTSC signal and a so-called 525P signal.
Only a video signal of (a sequential scanning method having 525 scanning lines) is defined. For a high-definition signal of a higher resolution, there is a fixed method for superimposing a CGMS signal. do not do.

Since this type of Hi-Vision signal is a high-resolution signal, it is considered that there is an increasing demand for preventing illegal duplication.

In view of the above, the present invention provides a method for superimposing CGMS-A information on an analog video signal.
It is an object of the present invention to provide a method that is difficult to be tampered with illegally and that can handle a high-definition signal.

[0016]

In order to solve the above-mentioned problems, a method of transmitting additional information of a video signal according to the present invention includes the steps of:
Depending on whether a pulse is inserted in a horizontal section before or after the vertical synchronization signal, 1-bit information is represented, and a plurality of bits of the 1-bit information is transmitted as one packet to transmit additional information. The additional information of one packet includes at least CGMS-A information.

According to the present invention having the above configuration, one bit of information is inserted in each vertical blanking period instead of superimposing additional information consisting of a plurality of bits in one horizontal section in the vertical blanking period. , Are collected for a plurality of bits, and the additional information is transmitted as one packet. That is, the data of one packet covers a section of a plurality of fields (frames). Then, at least CGMS-A information is included in the one packet.

As described above, the additional information is not superimposed on one specific horizontal section in the vertical blanking period, but is superimposed on a section extending over a plurality of fields or a plurality of frames. -It becomes difficult to falsify A information. When all the additional information of a plurality of bits are superimposed on one horizontal section, the number of superimposed bits is limited because one horizontal section is a fixed section.
In the case of the present invention, the number of bits constituting a packet is
It is possible to set according to the amount of additional information to be transmitted. Therefore, the amount of information that can be transmitted is increased.

There is also an advantage that the present invention can be easily applied to a video signal having a resolution of 525P or more.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for transmitting additional information of a video signal according to the present invention will be described below with reference to the drawings.

[Embodiment of Method of Transmitting Additional Information] [First Embodiment] FIG. 1 is a diagram for explaining a first embodiment of a method of transmitting additional information of a video signal according to the present invention. This is an example in which the present invention is applied to an NTSC video signal. In this embodiment, 1
One bit of additional information is superimposed on a video signal and transmitted during one vertical blanking period. Then, additional information of one packet consisting of a plurality of bits is transmitted by being superimposed on the video signal by a plurality of vertical blanking periods.

FIGS. 1A and 1B show the state of a section near a vertical synchronizing signal in a vertical blanking period of an NTSC video signal in this embodiment.
In this embodiment, immediately before the vertical synchronization signal section,
In one of the sections immediately after, one pulse P having a predetermined pulse height
Is superimposed so that 1-bit additional information is superimposed on the video signal.

For example, as shown in FIG. 1A, when a pulse P is inserted in a horizontal section immediately after a vertical synchronization signal section, the additional information bit to be superimposed is set to "1". As shown in B), when the pulse P is inserted in the horizontal section immediately before the vertical synchronization signal section, the superimposed additional information bit is set to “0”.

In this embodiment, the pulse P is inserted on the white level side in the pedestal level section immediately after the equalization pulse. This generally corresponds to a pulse section where a pedestal clamp is performed in a television receiver.

Therefore, within the vertical blanking period,
The pulse P having the predetermined height is detected depending on whether or not a predetermined threshold value is exceeded, and one bit within one vertical blanking period is determined based on the relationship between the detected position and the vertical synchronization signal. Can be transmitted and detected.

As described above, one bit is transmitted during one vertical blanking period, a plurality of bits are transmitted during the plurality of vertical blanking periods, and one packet is constituted by the predetermined number of the plurality of bits.

FIG. 1C shows an example of the data structure of the additional information of one packet. That is, a predetermined plurality of bits, for example, 4 bits at the head of one packet are used as a header, and CGMS-A information and APS information are included in, for example, 8 bits following the header. Finally, for example, an 8-bit terminator indicating the end of the packet is inserted. In addition,
When the size of one packet, that is, the data amount of one packet is fixed to a predetermined value, the terminator is not required.

FIG. 1D shows CGMS-A information and APS.
A correspondence table regarding ON / OFF control of insertion of an AGC pseudo sync pulse for a combination with information and burst inversion control for a color stripe is shown.

In the description of the first embodiment, one packet includes AP information in addition to CGMS-A information.
Although the S information is included, the APS information need not be included.

FIG. 1 has described the case of the NTSC video signal. However, even in the case of the 525P video signal, the synchronization signal has a similar shape.
The same applies to 5P video signals.

[Second Embodiment] The second embodiment differs from the first embodiment in the packet structure.

As a method for controlling the copy generation of the video signal, a method using a digital watermarking process is known in addition to the CGMS method.

The digital watermarking process is a process of embedding information as noise in a part of the video data that is not important for human perception, that is, a part that is not redundant to the video. The additional information embedded in the image data by such a digital watermarking process is not easily removed from the image data. On the other hand, even after filtering and data compression are performed on image data, it is possible to detect additional information embedded in the image data from the image data.

In the case of the copy control method using the digital watermarking process, “copy free (Copy Free)” and “copy once (only one generation is possible) (One C
opt) "" No more copying allowed (No More Cop)
y) ”and“ Never Copy ”indicate the copy generation and copy restriction status of the image data on which the digital watermark information is superimposed.

"Copy Free"
Indicates that image data can be freely copied.
"One time duplication possible (one generation duplication possible) (One C
opt) "indicates that the image data can be copied only once. "No more duplication (No More
“Copy)” indicates that the image data is a copy of the image data that can be copied once, and that further copy is prohibited. “Absolute duplication prohibited (Never Copy)” indicates that duplication is completely prohibited.

As the digital watermarking process, PN (Pseu
A method of spread-spectruming copy control information using a code of a random noise (pseudo-noise code) sequence (hereinafter referred to as a PN code) and superimposing the spectrum-spread copy control information as digital watermark information WM on image information is known. is there.

In this method, since the digital watermark information is superimposed in the same time domain and frequency domain as the video signal, it is difficult to completely delete the superimposed digital watermark information. Therefore, there is a remarkable effect that unauthorized tampering is difficult.

However, for example, when rewriting from "one copy possible (one copy possible) (One Copy) (One Copy)" to "no more copy prohibited (No More Copy)", the previous electronic The watermark information remains without being completely erased. So, without erasing,
For example, a method has been considered in which both of the spread spectrum signals are detected by superimposing and superimposing using different series of PN codes, and the one whose copy generation is closer to the copy prohibition is selected.

However, when a plurality of spread spectrum signals are superimposed on the video signal, there is a problem that the spread spectrum signal becomes easily visible on the screen. For this reason, for example, in the case of enabling one-time copying, the digital watermark information is not rewritten from the state of “one-time copying (only one generation can be copied) (One Copy)”, and the additional information is added during the vertical blanking period. It is considered that the ticket information is transmitted in a superimposed manner, and the ticket information indicates whether or not the copying has been performed. That is, the electronic watermark information is not rewritten, but the ticket information is rewritten.

In the case of the second embodiment, as shown in FIG. 2, the ticket information is included in the information of one packet as the additional information. That is, in the example of FIG. 2, the header information and the CGMS-A / AP
The ticket information is inserted between the S information.

According to the second embodiment, CGMS
It is possible to control the generation limit of the duplication of the video signal by the information, and the generation restriction control of the duplication of the video signal by the digital watermark information can be realized with less deterioration of the video signal, thereby more strongly preventing the occurrence of illegal duplication. be able to. That is, for example, even if the CGMS information is falsified, it is considered that the digital watermark information, which is very difficult to falsify, is correctly transmitted, and the illegal duplication can be strongly prevented.

[Third Embodiment] The insertion position of the pulse P shown in FIG. 1 of the above-described embodiment is a pedestal level portion immediately after a synchronization pulse, and this position is a direct current in a television receiver. This is the position where the pedestal clamp for regeneration is performed. Therefore, when the clamp level is pulse P
May fluctuate.

Therefore, in the third embodiment, as shown in FIGS. 3A and 3B, the superposition position of the pulse P is set to the interval immediately after the synchronization pulse where the pedestal clamp is performed. Is shifted so as to be a section excluding.

The detection of the pulse P and the detection of the additional information bit in the case of the third embodiment can be performed in the same manner as in the first embodiment.

According to the third embodiment, the superposition of the pulse P during the vertical blanking period can prevent an adverse effect on the operation of the pedestal clamp in the television receiver.

In the third embodiment, not only the NTSC video signal but also the synchronization signal has a similar shape to the 525P signal.
It is needless to say that the present invention can be applied to the video signal of

[Fourth Embodiment] In the above embodiment, an NTSC color video signal or a 525P video signal has been described. However, a video signal having a resolution of 525P or more, for example, a high definition signal such as 1080I is also applicable. The present invention is applicable.

However, the synchronization signal HD of the HDTV signal
Has three values as shown in FIG. That is, the synchronization pulse HD of the HDTV signal includes a synchronization pulse HDa (hereinafter referred to as a negative direction pulse) lower than the pedestal level and a synchronization pulse HDb (hereinafter referred to as the positive direction pulse) higher than the pedestal level. ). For this reason, the back porch portion of the synchronization signal as shown in FIG. 1 overlaps with the forward pulse HDb, and the pulse P as described above cannot be superimposed.
The fourth embodiment provides a method of superimposing pulses in consideration of this point.

FIG. 5 shows a method of superimposing pulses according to the fourth embodiment. In the synchronization signal portion shown in FIG. 5A, the negative direction pulse HDa and the positive direction pulse HDb of the synchronization signal HD are the same, which is a state in which 1-bit data is not superimposed.

On the other hand, FIG. 5B shows a synchronization signal portion when 1-bit data is superimposed. The height of the negative direction pulse HDa does not change, but the height of the positive direction pulse HDb changes. Thus, the positive pulse HDc has a pulse height that is high enough to be distinguished from the pulse HDb.

As shown in FIG. 6A, when the synchronization signal HD in which the forward pulse is changed from the pulse HDb to the pulse HDc is inserted in the horizontal section after the vertical synchronization signal, , The superimposed 1-bit data is
It is set to “1”, and as shown in FIG. 6B, the synchronization signal HD in which the positive direction pulse has been changed from the pulse HDb to the pulse HDc is inserted in the horizontal section before the vertical synchronization signal. In this case, the superimposed 1-bit data is
It is set to “0”.

In the case of the fourth embodiment, a threshold value of an intermediate level between the height of the pulse HDb and the height of the pulse HDc is prepared, and the threshold value is set within the vertical blanking period. A pulse exceeding the threshold value is detected as a pulse HDc to detect the presence of 1-bit superimposed data. Then, by detecting whether the detection point of the pulse HDc in the vertical blanking period is before or after the vertical synchronizing signal, it is detected whether the detected 1-bit data is "1" or "0". I do. In this manner, 1-bit data can be detected in one vertical blanking period in the same manner as in the above-described embodiment.

[Fifth Embodiment] In the above embodiment, one bit “1” is added before and after the vertical synchronization signal of the inserted pulse in the vertical blanking period.
Represented as "0". On the other hand, in the fifth embodiment, in a specific horizontal section in the vertical blanking period, a pulse in the positive direction (white level direction) is inserted into the pedestal level portion after the horizontal synchronization signal. However, 1-bit data "1" and "0" are represented by changing attributes such as the width, height or position of the pulse.

FIG. 7 shows a case where the fifth embodiment is applied to a Hi-Vision signal. There are three cases of Examples 1 to 3 depending on the attribute of the insertion pulse to be changed. FIG. 7 shows a pulse in which the pulse Phd is inserted.

FIG. 7A shows the synchronization signal HD portion of the Hi-Vision signal, in which there is no data, and the pulse Phd is superimposed on the pedestal level portion after the synchronization signal HD. It has not been done.

In the first embodiment of the fifth embodiment, the pulse width of the positive direction (white level direction) pulse Phd superimposed on the pedestal level portion after the synchronizing pulse HD is changed to change 1 bit. Express information.

That is, as shown in, for example, FIG. 7B, in the first embodiment, the pulse Phd is superimposed on the position after the synchronization signal HD by d, and the pulse width W1 is wide. Sometimes, 1-bit data "1"
And when the pulse width is W0, which is narrow, 1
It is determined so as to represent "0" of the bit data.

In the case of the first embodiment, it is determined whether or not the pulse Phd exists at the position of d immediately after the synchronization signal HD, and whether or not 1-bit data is superimposed is determined. When Phd is superimposed, for example, depending on whether the pulse width is larger than a threshold value Wth set as W0 <Wth <W1, "1", "0" of the superimposed 1-bit data is determined. Is determined.

In the case of the first embodiment, as shown in FIG. 7B, the height of the pulse Phd is set to be higher than the positive direction pulse HDb of the synchronization signal HD like the pulse height of the pulse HDc. By detecting a pulse having a pulse height higher than the pulse HDb, the presence or absence of the pulse Phd can be detected, and when the pulse Phd is detected, the pulse width can be detected.

In the first embodiment, the pulse Phd
In the case where the former method is used as the method for detecting the pulse, the pulse height of the pulse Phd need not be higher than the positive direction pulse HDb.

Next, in Example 2 of the fifth embodiment, the pulse height of the positive direction (white level direction) pulse Phd superimposed on the pedestal level portion after the synchronization pulse HD is changed. 1-bit information.

That is, as shown in FIG. 7C, in the second embodiment, the pulse Phd is superimposed at a position d after the synchronizing signal HD, but the pulse height H1 is high. , The 1-bit data "1" is defined, and when the pulse height is H0, the 1-bit data "0" is defined.

In the case of the second embodiment, for example, it is determined whether or not the pulse Phd exists at the position of d immediately after the synchronization signal HD to determine whether or not 1-bit data is superimposed. When the pulse Phd is superimposed, for example, whether the height of the pulse is greater than a threshold value Hth set to H0 <Hth <H1 is determined by whether or not the pulse Phd is "1". , “0” is determined.

Further, Example 3 of the fifth embodiment
In, the pulse position of the pulse Phd in the positive direction (white level direction) superimposed on the pedestal level portion after the synchronization pulse HD is changed to express 1-bit information.

That is, as shown in FIG. 7D, in the third embodiment, a pulse Phd whose pulse height is higher than the positive pulse HDb of the synchronization signal HD is at a position at a distance d1 far from the synchronization signal HD. Is determined to represent 1-bit data "1" when the data is superimposed on the synchronization signal HD.

In the case of the third embodiment, for example, by detecting a pulse having a pulse height higher than the pulse HDb, the presence or absence of the pulse Phd is detected to determine whether or not 1-bit data is superimposed. , And the pulse Phd is detected, the pulse position with respect to the synchronization signal HD is detected to determine "1" and "0" of the superimposed 1-bit data.

As described above, according to the fifth embodiment, it is possible to transmit 1-bit information by using the attribute of the pulse Phd superimposed after the synchronization signal HD. As information of a packet consisting of a plurality of bits, CGMS-A information and APS information, and further, as in the first and second embodiments described above,
This enables transmission of ticket information.

Although the fifth embodiment of the method for transmitting additional information has been applied to a Hi-Vision signal, the fifth embodiment is not limited to a Hi-Vision signal, and may be an NTSC video signal or a PAL signal. The present invention is also applicable to SD (standard) signals such as video signals.

[Embodiment of Output Apparatus for Video Signal] Next, as an embodiment of an output apparatus to which the method for transmitting additional information of a video signal according to the present invention described above is applied, a so-called set-top box is used. Will be described. In the following description, a recording device and a reproducing device that support the copy generation restriction process using the CGMS method are called compliant devices, and a device that does not support the copy generation restriction process is called a non-compliant device. I will.

FIG. 8 is a block diagram showing a configuration example of a set-top box. In the following description, a case will be described in which the first embodiment of the above-described additional information transmission method is applied to this set-top box.

As shown in FIG. 8, a tuning control signal corresponding to a user's tuning operation through a key operation unit (not shown) is supplied from the control unit 10 to the tuning unit 11, so that the tuning unit 11 selects a channel. The signal of the channel thus supplied is supplied to a descrambling unit 12, where a descrambling process for descrambling the broadcast signal is performed. Then, the signal of the descrambled channel is supplied to the demultiplex unit 13. In the demultiplex unit 13, since the output signal from the channel selection unit 11 includes a plurality of broadcast programs, the data of the broadcast program corresponding to the user's operation of selecting the broadcast program from the control unit 10. Is extracted.

The video data Di of the broadcast program from the demultiplex unit 13 is MPEG-compressed. Therefore, the data Di from the demultiplex unit 13 is supplied to the video data decoding unit 14 to supply the data Di to the display monitor device, for example.
It is PEG decoded and decompressed and decoded. This MPEG
The decoded data is converted into an analog video signal by a D / A converter 15 and then led out to an analog output terminal 17 through an additional information superimposing circuit 16 and supplied to, for example, a display monitor device.

In this embodiment, MPEG-compressed video data Di from the demultiplex unit 13 is digitally output through an IEEE 1394 interface bus. In this case, the IEEE
The 1394 secure bus is used to prevent duplication (copyright protection).

That is, the output data Di of the demultiplex unit 13 is supplied to the CGMS-D decoding unit 18 and the CGMS-D added to the broadcast program data.
Information is extracted.

The CGMS-D information is extracted as 2-bit information at a specific position separated from the video data, and the 2-bit information is supplied to the control unit 10.

The output data of the demultiplex unit 13 is also supplied to the encryption unit 19, and the control unit 1
Under the control from 0, encryption based on an encryption key that is different for each communication is performed on the compressed video data. This encryption unit 1
9 is supplied to the output destination electronic device through the output terminal 21 through the IEEE1394 interface 20. The IEEE 1394 interface 20 performs data conversion and outputs data so as to conform to the IEEE 1394 interface standard.

At this time, the control unit 10
The device communicates with the output destination device through the E1394 interface 20, 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 10 executes the CGMS
-D output of the copy control information of the D decoding unit 18 and IE
From the discrimination information of the device of the output destination through the EE1394 interface 20, it is determined whether or not the encryption key information to be decrypted by the encryption unit 19 is transmitted 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 -D information is [11], the encryption key information is not passed to the output destination device. In this way, regarding the transmission of the digital video signal, based on the CGMS-D information, the IEEE
The 1394 secure bus system prevents unauthorized duplication.

On the other hand, in this embodiment, for the analog video signal from the D / A converter 15, the additional information superimposing circuit 16 uses the first embodiment of the above-described additional information transmission method. Thus, the CGMS-A information and the APS information are superimposed. In this case, the packet structure of the additional information is as shown in FIG. 1C, and does not include the ticket information.

That is, the set-top box of this embodiment includes the CGMS-A / APS information generating unit 22. The CGMS-A / APS information generation unit 22 is supplied with an output bit timing signal TM and a generation information control signal CT from the control unit 10.

The generation information control signal CT is CGM
What kind of data is generated according to the CGMS-D information from the SD decoding unit 18 and is generated as one packet data of FIG. 1C generated from the CGMS-A / APS information generating unit 22 Control.

That is, the generation information control signal CT
CGMS-A / APS information generation unit 22
The same two-bit information as the two-bit information of MS-D is CG
Generated as MS-A information. Also, CGMS-A / A
The APS information from the PS information generation unit 22 is determined according to the CGMS information by the generation information control signal CT, but when the CGMS information is “11”,
It is 2 bits set in advance among the four types shown in FIG. 1 (D).

The output bit timing signal TM determines the reference of the generation timing of the data of each bit of the packet whose generation is controlled by the generation information control signal CT as described above.

When the generated bit is "1" based on the timing signal TM, the CGMS-A / APS information generating section 22 operates as shown in FIG. The pulse P is generated in the horizontal section immediately after the synchronization signal, and when the generated bit is "0", the pulse P is generated in the horizontal section immediately before the vertical synchronization signal as shown in FIG. I do. Then, in the additional information superimposing circuit 16, the CGMS-A / A
The pulse P from the PS information generation unit 22 is D / A
The video signal from the converter 15 is superimposed on the pedestal level section in the horizontal section before or after the vertical synchronization signal in the vertical blanking period.

As described above, according to the present embodiment, the analog video signal transmitted from the output terminal 17 is not superimposed on a specific horizontal section in the vertical blanking period, but is overlaid over a plurality of field sections. As CGMS
-A information and APS information are superimposed. Therefore, compared to the conventional technology in which falsification is possible by replacing all information of a specific horizontal section, C
Falsification of GMS-A information becomes difficult.

As will be described later, even if the CGMS-D information included in the digital video information disappears from the analog video signal output, the analog video signal output is added to the additional information superimposing circuit 16. Since the CGMS-A information is added by the superimposed pulse in the vertical blanking period, an appropriate copy generation restriction process is performed in a recording apparatus that supports the copy generation restriction process based on the CGMS information. .

The output data from the video data decoding unit 14 includes luminance data Dy, chrominance signal data Dr,
In the case of Db, the additional information superimposing circuit 16 is provided in a signal system of luminance data.

FIG. 9 is a block diagram of the main part in that case. The luminance data Dy and the color difference signal data Dr and Db from the video data decoding unit 14 are respectively supplied to the D / A converters 15y and 15r. , 15b are converted to analog signals. Then, the red color difference signal R- which is the output signal of the D / A converters 15r and 15b is output.
The Y and blue color difference signals BY are output to the output terminal 17 as they are.
It is led out through r and 17b.

The luminance signal Y, which is the output signal of the D / A converter 15y, is supplied to the additional information superimposing circuit 16 and, as described above, the CGMS-A / APS information generator 2
The pulse P from 2 is superimposed before or after the vertical synchronizing signal in the vertical blanking period, and superimposed on the CGMS-A information and APS information, and thereafter, is led out through the output terminal 17y.

[Other Embodiments of Video Signal Output Device]
This embodiment is based on the second method of transmitting the additional information described above.
This is an embodiment of an output device corresponding to the embodiment.
In the case of this embodiment, digital watermark information is superimposed on a target video signal. Then, the packet of the additional information includes the above-described ticket information as shown in FIG.

FIG. 10 is a block diagram when this embodiment is applied to the same set-top box as described above. In the case of this example, the digital watermark information WM is superimposed on the received and selected video signal in the baseband region.

In the present embodiment, the digital watermark processing is PN (Pseudorandom Noi).
(se; pseudo-noise code) using a code of a sequence (hereinafter referred to as a PN code) to spread spectrum the copy control information, and superimpose the spectrum spread copy control information as digital watermark information WM on the image information. I have.

In this example, a PN code to be used as a spreading code is generated at a sufficiently early cycle, and is multiplied by the copy control information as additional information to spread the spectrum, thereby achieving a narrow band, high level The duplication control information of the broadband without affecting the video signal,
The signal is converted to a minute signal. Then, the spread spectrum copy control information is superimposed on the video data and transmitted.

In the case of this embodiment, as described above, the copy control information based on the digital watermark is changed from the state of “one copy” to “prohibition of further copy (No More Copy)” as described above. It is not rewritten. Therefore, the copy control information of the digital watermark superimposed on the video data includes "copy no more (N
o More Copy) ". Then, as described above, the ticket information is added to the video signal to indicate whether copying is permitted once or more is prohibited.

As shown in FIG. 10, in this embodiment of the output device, the video data decoder 14 is supplied to the WM decoder 23. Then, this WM decoding unit 2
At 3, the digital watermark information WM is detected, and the copy control information is determined by the control unit 10.

Further, in the embodiment of the output device shown in FIG. 10, a ticket information and CGMS-A / APS information generating section 24 is provided. This information generating unit 24
The generation of the MS-A / APS information is the same as that of the information generation unit 22 described above, and the CGMS-D decoding unit 1
8 generates CGMS-A information and APS information based on the CGMS-D information.

The information generating unit 24 further includes:
A packet as shown in FIG. 2 is generated. The control unit 10 instructs the information generation unit 24 whether to include the ticket information in the packet and, if so, which ticket information to include, based on the copy control information by the digital watermark from the WM decoding unit 23. I do. That is, when the copy control information based on the digital watermark is in a state of “one copy possible (One Copy)”, the control unit 10 instructs the information generation unit 24 to generate the ticket information.

In the case of this set-top box, the digital watermark information is “one copy possible (One Copy)”.
If so, the information has not yet been copied, so the information generating unit 24 includes in the packet ticket information indicating that the data is not copied. In this case, the CGMS-D information may be referred to confirm that it is “10”. Also, referring to the CGMS-D information, it is "1
If the value is "1", the packet includes ticket information indicating that the data has been copied. In addition,
When the copy control information is in another state, it is not necessary to include the ticket information in the packet.

FIG. 11 shows the digital watermark information WM in this case.
FIG. 4 is a block diagram for explaining a process of superimposing on an information signal. That is, in FIG. 11, for example, the video signal Vi
Are detected by the synchronization detecting section 31, and the detection output is supplied to the timing signal generating section 32. The timing signal generator 32 generates a timing signal synchronized with the vertical synchronization signal.

In this example, the PN generator 33 generates a PN code sequence that repeats in a vertical cycle in synchronization with the timing signal from the timing signal generator 32, and divides the PN code sequence into the SS spreading unit 33 (SS is This is an abbreviation of spread spectrum.

The copy control information generator 35 synchronizes with the timing signal from the timing signal generator 32 to
Copy control information to be superimposed on the video signal Vi as electronic watermark information is generated and supplied to the SS spreading unit 34. In this case, the copy control information to be superimposed is determined according to the information to be transmitted, and "copy permitted (CopyF)
ree), "one copy" and "absolute copy prohibition (Never Copy)" are generated.

The SS spreading section 34 multiplies the copy control information by the PN code sequence to generate a spread spectrum signal.
Then, the spread spectrum signal is supplied to the level adjusting unit 36.
To the electronic watermark information WM superimposing unit 37 through the, and superimposes it as electronic watermark information on the input video signal Vi. The level adjustment unit 36 adjusts the superimposition level to such an extent that the reproduced video is not deteriorated by the superimposition of the digital watermark information. In this case, the SS digital watermark information is superimposed at a level smaller than the dynamic range of the video signal.

FIG. 13 shows the relationship between the copy control information to be superimposed as digital watermark information and the video signal by spectrum. The copy control information contains a small amount of information and is a low bit rate signal.
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. 13B is obtained. At this time, the spread spectrum signal level decreases in inverse proportion to the band expansion ratio.

This spread spectrum signal, that is, S
The S replication control information is superimposed on the video signal Vi by the WM superimposition unit 37. In this case, as shown in FIG. 13C, the SS replication control information has a level smaller than the dynamic range of the video signal as the information signal. Copy control information is superimposed. By superimposing in this manner, deterioration of the video signal as the main information signal can hardly occur. Therefore, as described above, when the video signal on which the SS duplication control information is superimposed is supplied to the monitor receiver and the video is reproduced, the SS duplication control information has almost no effect, and a good reproduced video is obtained. It is something that can be done.

On the other hand, as will be described later, when the inverse spread spectrum is performed to detect the SS copy control information,
As shown in FIG. 3 (d), the SS duplication control 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, the SS copy control information superimposed on the video signal is not removed, and it is difficult to falsify the SS copy control information. Therefore, copy control that can reliably prevent unauthorized duplication becomes possible.

Further, in the above-described configuration, the spread spectrum is performed using the PN code string of the vertical cycle using the vertical synchronization signal as the reference signal. Therefore, when this spread spectrum signal is detected from the video signal, The required inverse PN code sequence for spread spectrum can be easily generated based on a signal synchronized with the vertical synchronization signal detected from the video signal.

The SS copy control information as the digital watermark information WM superimposed as described above is extracted and determined.
The M decoding unit 23 can be configured as shown in FIG. That is, as shown in FIG. 12, the video data from the video data decoding unit 14 is supplied to the despreading unit 234 and is also supplied to the synchronization detection unit 231. The synchronization detector 231 detects the vertical synchronization timing and supplies the detection output to the timing signal generator 232.

The timing signal generator 232 supplies a vertical synchronization timing signal to the PN generator 233. This P
The N generator 233 generates the same PN code sequence as the PN generator 33 on the superimposition side in FIG. 11, and generates a PN code string at the same vertical synchronization timing as the superimposition side. The PN code string from the PN generator 233 is transmitted to the despreader 23.
4 to obtain the copy control information which has been spread. This copy control information is supplied to the WM determining unit 235, and the copy control state is determined. Then, the determination output is supplied to the control unit 10.

According to this embodiment, digital watermark information is superimposed on the output analog video signal.
Since the ticket information is superimposed, it is possible to reliably realize a method in which the digital watermark information is not rewritten.

The above is the case of the video signal output apparatus to which the first and second embodiments of the method for transmitting the additional information are applied. It goes without saying that the fourth and fifth embodiments in the case of a high definition signal can be similarly applied.

In this case, however, CGMS-A information and APS information based on the control signal CT, and furthermore,
The generation control of the ticket information does not change, but CGMS-A
/ APS information generator 22, ticket information and CGMS
A difference from the above is that the generation of a pulse to be inserted or superimposed is controlled according to “1” or “0” of each 1-bit data by the timing signal TM supplied to the A / APS information generation unit 24 Things.

[Embodiment of Video Signal Recording Apparatus] FIG.
FIG. 4 is a block diagram of a configuration example of a compliant recording device 40 as an embodiment of the video signal recording device according to the present invention.

As shown in FIG. 14, the compliant recording apparatus 40 has a digital input terminal 41d for the IEEE1394 interface and an analog input terminal 4d.
1a. Digital input terminal 41d is IEEE1
394 interface 42. This IEEE
The E1394 interface 42 is used for the IEEE13
A process for restoring data that has been converted to conform to the 94 bus interface standard is performed.

This IEEE 1394 interface 4
2 is supplied to the decryption unit 43. As described above, for the information that is determined by the device connected to the digital input terminal 41d to be able to copy the information signal, the device sends encryption key information to decrypt the information. When the encryption key information is obtained, the encryption decryption unit 43 can decrypt the data from the IEEE 1394 interface 42 and restore the compressed video data. The restored compressed video data is supplied to the selector 44.

The video information input through the analog input terminal 41a is transmitted to the analog interface 45.
Is supplied to the compression encoder 46 through the
After being compressed, it is supplied to the selector 44.

The analog video signal from the analog interface 45 is supplied to a CGMS-A information detecting section 47. The CGMS-A information detection unit 47 collects one bit of the above-described additional information, which is superimposed in each vertical blanking period of the analog video signal from the analog interface 45, for a plurality of fields of the vertical blanking period and packetizes the collected information. , CGMS- in the packet
A information is detected. Then, the detected CGMS-A
The information is supplied to the control unit 50.

The selector 44 selects and outputs one of the data from the decryption unit 43 and the data from the encoding unit 46 according to a selector control signal according to the user's input selection.

The output data of this selector 44 is CGM
The data is supplied to the recording control unit 211 via the S rewriting unit 48.
The output data of the selector 44 is also supplied to a CGMS-D decoding unit 49 and a WM decoding unit 51, where CGMS-D information and digital watermark information are extracted and determined in the same manner as described above. The discrimination output of D information and digital watermark information is transmitted to
0 is supplied.

In this case, the CGMS-D decoding unit 49
Is the CGM from the digital data through the decryption unit 43
Extract SD information. Since the digital data from the encoding unit 46 does not include CGMS-D information or includes dummy data, the digital data is not subjected to an extraction operation.

On the other hand, the WM decoding unit 51 detects the digital watermark information WM from any digital data of the decryption unit 43 and the encoding unit 46.

When the input signal for recording is an analog video signal, the control unit 50 determines whether the input signal for recording is a digital compressed video signal based on the discrimination output of the CGMS-A information and the digital watermark information. In the case of a signal, it is determined whether or not recording (copying) of input information is possible, and it is determined that recording (copying) is possible, based on the discrimination output of CGMS-D information and digital watermark information. At this time, it is determined whether the CGMS-D information needs to be rewritten for copy control.

When the control unit 50 determines that the recording is prohibited, the control unit 50 controls the recording control unit 211 so as not to execute the recording.

When it is determined that recording is possible or that copying is possible once, the control unit 50 controls the recording control unit 52 to execute recording, and the recording data is recorded on the disk 53. To

If it is determined that copying is possible once,
The CGMS-D rewriting unit 4 rewrites the CGMS-D information.
Execute at 8. CGMS-D rewriting unit 4 in this case
8 indicates that the CGMS-D information is a specific position 2 in the data stream from the decryption unit 43 or the encoding unit 46.
Since it is bit data, the 2-bit data is [1
1].

As described above, according to the recording apparatus of FIG. 14, the digital video signal is protected by the IEEE 1394 secure bus interface, and
Recording control is performed based on the GMS-D and the digital watermark information WM, and rewriting of the CGMS-D information is performed, and copy generation restriction control is performed.

On the other hand, when the input analog video signal is converted into a digital signal and recorded on the disk 53, a CGM obtained by collecting a plurality of bits of 1-bit data by a pulse superimposed in a vertical blanking period and packetizing the data is obtained.
Copy generation restriction control is performed based on the SA information.
That is, the recording control is performed, and the CGMS-D information is rewritten based on the CGMS-A information.

Therefore, even if the input signal is an analog video signal, it is possible to record the correct CGMS-D information while including it in the digital video signal.

Although the above is the case of digital recording of a video signal, in the case of analog recording in which an analog video signal is recorded on a recording medium, when digital watermark information is superimposed on the video signal, As described above, the ticket information is included in the packet as additional information in addition to the CGMS-A information, and is superimposed on the video signal and transmitted. Therefore, rewriting of the digital watermark information becomes unnecessary.

[Embodiment of Video Signal Reproducing Apparatus] FIG.
FIG. 5 is a block diagram of a configuration example of a compliant playback device 60 as an embodiment of a video signal playback device according to the present invention. In this case, the video signal is compressed and digitally recorded on the disk 53, and the CGMS-D
The information is superimposed, and the digital watermark information WM is superimposed on the video signal.

As shown in FIG. 15, the playback device 6
The information recorded on the disk 53 loaded in “0” is
The data is read by the reading unit 61 and supplied to the CGMS-D decoding unit 62, the WM decoding unit 63, and the video data decoding unit 64.

The CGMS-D decoding unit 62 and the WM decoding unit 63 extract and discriminate the CGMS-D information and the digital watermark information WM, and output the discrimination between the CGMS-D information and the digital watermark information WM. 70.

In the video data decoding section 64, the MPE
The G-compressed data is decompressed and decoded. The decompressed data is supplied to a D / A converter 65, converted into an analog signal, and supplied to an additional information superimposing unit 66. The ticket information and the CGMS-A / APS information from the CGMS-A / APS information generating unit 68 are supplied to the additional information superimposing unit 66, and one packet consisting of a plurality of bits is supplied in the same manner as described above. Are superimposed and added as one bit at a time in the vertical blanking period of the analog video signal (the luminance signal thereof).

Ticket information and CGMS-A / APS
Ticket information and CGM generated from the information generation unit 68
The SA information and the APS information are stored in the CGMS-D decoding unit 6.
2 is generated and controlled by a control signal CT from a control unit 70 on the basis of the determination result of the CGMS-D information from the control unit 2 and the determination result of the digital watermark information WM from the WM decoding unit 63. The generation timing is controlled by the TM in the same manner as in the embodiment of the set-top box in FIG. 10 described above.

As described above, when the digital video signal which is compression-encoded and recorded on the disk 53 is decoded, converted to an analog video signal and output, the CGMS-D
Even if information is missing, CGMS-A information, ticket information,
Since the APS information is added, when this analog video signal is recorded by a compliant recording device as shown in FIG. 14, the copy generation is reliably restricted.

Also in the case of this recording apparatus, it goes without saying that all of the above-described first to fifth embodiments can be applied to the transmission method of the additional information.

[Embodiment of Signal Conversion Apparatus] As described above, according to the present invention, CGMS-A information is superimposed even when output as an analog video signal. Can be expected to take place.
This means that, as described above, in the case of the present invention, not only the NTS video signal and the 525P video signal but also 720P, 1080I,
It can also be applied to high definition video signals such as 1080P.

In order to display such a high-definition video signal on a television receiver for NTSC video signals, it is necessary to perform signal conversion such as conversion of the number of scanning lines and conversion of a frame rate. is there. In this case, the vertical blanking period is also converted.

Then, as described above, the CGMS-A information, ticket information, and APS information superimposed during the vertical blanking period disappear. However, in the case of the above-described embodiment, since the high-definition video signal includes the APS information, the NTSC signal after the signal conversion is based on the APS information when illegal duplication is performed. In addition, it is possible to insert a pseudo-synchronizing pulse so as not to be able to be correctly reproduced by a television receiver, and to perform color stripe control.

FIG. 16 is a block diagram showing an example of a down converter as this signal conversion device. This example
This is an example of a case where a high definition video signal including a luminance signal Y and color difference signals RY and BY is converted into an NTSC video signal.

That is, the luminance signal Y and the color difference signals RY and BY of the high-definition video signal input through the input terminals 71, 72 and 73 are supplied to the signal conversion section 74. It is converted to the format of the NTSC video signal. Then, the NTSC video signal from the signal conversion unit 74 is supplied to a pseudo sync pulse superimposition / color stripe processing control unit 75.

The luminance signal Y from the input terminal 71
Is also supplied to the CGMS-A / APS information detection unit 76. The CGMS-A / APS information detection unit 76 detects one bit of the additional information by detecting a pulse inserted in each vertical blanking period of the luminance signal Y.

In this case, when the form of the additional information transmission method shown in FIG. 6 is used, the pulse HDc is detected within the vertical blanking period, and whether the pulse HDc is before the vertical synchronization signal is detected. , 1-bit information "0" and "1" are determined depending on whether it is later. Further, when the form of the additional information transmission method shown in FIG. 7 is used, the pulse Phd in the vertical blanking period is detected, and
By detecting the pulse width, pulse height, and pulse position, 1-bit information "0" and "1" are determined.

The CGMS-A / APS information detecting section 76
The 1-bit information detected as described above is collected for a plurality of predetermined bits and packetized. Then, CGMS-A information and APS information are extracted from the packet data and sent to the pseudo sync pulse superimposition / color stripe control unit 75.

Based on the CGMS-A information and APS information supplied thereto, the pseudo sync pulse superimposition / color stripe processing control unit 75 determines the pseudo sync pulse (AGC pulse) based on the relationship shown in FIG. ) Is required (needed when ON), color stripe processing is required (OFF means unnecessary in FIG. 1D), and color stripe processing is required. It is determined whether burst inversion is performed every two horizontal lines or every four horizontal lines.

That is, if the CGMS-A information is “00”
Alternatively, when “10” is set and duplication is permitted or duplication is permitted once, it is determined that superimposition of a pseudo sync pulse and color stripe processing are not performed. When the CGMS-A information is "11" and the copy is prohibited, the pseudo sync pulse is superimposed and the color stripe processing is performed as indicated by the APS information with reference to the APS information. Is determined.

The pseudo sync pulse superimposition / color stripe processing control section 75 controls the superimposition of the pseudo sync pulse on the output NTSC video signal and the color stripe processing control based on the above determination. As described above, the NTSC video signal on which the superimposition control of the pseudo sync pulse and the color stripe processing control have been performed is output through the output terminal 77.

Therefore, the CGMS-A information of the high-definition video signal input to the down converter 70 is “1”.
In the case of "1" indicating that duplication is prohibited, a pseudo sync pulse or color stripe processing is performed on the NTSC video signal obtained at the output terminal 77 according to the setting of the APS information. Even if an analog video signal that has been subjected to a pseudo-sync pulse or color stripe processing is recorded by a recording device for an analog video signal, the reproduced video is disturbed and cannot be viewed, and copyright protection is realized. .

Although the above description is for the case where the output video signal is an NTSC signal, the same applies to the case where a high-definition video signal is converted into another SD (standard) signal such as a PAL signal.

The above description is directed to a down converter for converting a high-definition video signal into a normal-definition video signal such as an NTSC video signal as a signal conversion. It is needless to say that the present invention is similarly applied to a case where a signal format conversion is performed as in the case of a video signal and an output video signal such as a PAL signal or a SECAM signal. That is, this embodiment can be applied to all cases where the signals in the vertical blanking period are switched by signal conversion and the superimposed additional information is lost.

In the case where an analog video signal is recorded on a disk or the like, the recorded video signal contains C
When the GMS-A / APS information is superimposed, the CGMS-A information is "11" when reproduced by a reproducing apparatus and output as, for example, an NTSC signal,
In the case of indicating that copying is prohibited, the output NTSC video signal may be subjected to a pseudo sync pulse or color stripe processing according to the setting of the APS information.

[0154]

As described above, according to the present invention, instead of superimposing additional information on a specific horizontal section in a vertical blanking period, a packet structure is formed in a section extending over a plurality of fields or a plurality of frames. Since the additional information is superimposed, it is difficult to falsify the CGMS-A information among the additional information.

When all the additional information of a plurality of bits are superimposed on one horizontal section, the number of superimposed bits is limited because one horizontal section is a fixed section. The number of bits constituting a packet can be set according to the amount of additional information to be transmitted. For this reason, the amount of information that can be transmitted increases, and for example, it is possible to transmit ticket information when digital watermark information is superimposed on a video signal.

The conventional method of superimposing on a specific horizontal section in the vertical blanking period is a method which is determined only for the current SD signal such as the NTSC video signal or the 525P video signal. According to this, it is possible to apply the present invention not only to the SD signal but also to a high-definition video signal such as a Hi-Vision signal.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a first embodiment of a method for transmitting additional information according to the present invention.

FIG. 2 is a diagram for explaining a second embodiment of a method for transmitting additional information according to the present invention.

FIG. 3 is a diagram for explaining a third embodiment of a method for transmitting additional information according to the present invention.

FIG. 4 is a diagram for explaining a synchronizing signal of a Hi-Vision signal.

FIG. 5 is a diagram for explaining a fourth embodiment of a method for transmitting additional information according to the present invention.

FIG. 6 is a diagram for explaining a fourth embodiment of a method for transmitting additional information according to the present invention.

FIG. 7 is a diagram for explaining a fifth embodiment of the method for transmitting additional information according to the present invention.

FIG. 8 is a block diagram showing an embodiment of a video signal output device according to the present invention.

9 is a diagram illustrating another example of the configuration of some of the blocks in FIG. 8;

FIG. 10 is a block diagram showing another embodiment of the video signal output device according to the present invention.

FIG. 11 is a block diagram for explaining an example of a method for superimposing digital watermark information.

FIG. 12 is a block diagram illustrating an example of a method for detecting digital watermark information.

FIG. 13 is a diagram for describing superimposition on a video signal by digital watermarking processing.

FIG. 14 is a block diagram of an embodiment of a video signal recording device according to the present invention.

FIG. 15 is a block diagram of an embodiment of a video signal reproducing apparatus according to the present invention.

FIG. 16 is a block diagram of an embodiment of a signal conversion device according to the present invention.

[Explanation of Symbols] 10: control unit, 16: additional information superimposing circuit, 18
... CGMS-D decoding unit, 19 ... Encryption unit, 20 ... I
EEE1394 interface, 22 ... CGMS-A
/ APS information generating unit, 23: digital watermark information WM decoding unit, 24: ticket information and CGMS-A / APS
Information generator, 47 ... CGMS-A detector, 49 ... CGM
SD rewriting section, 50 control section, 52 recording control section, 68 ticket information and CGMS-A / APS information generation section, 74 signal conversion section, 75 pseudo-sync pulse superimposition / color stripe processing control section, 76 ... CGMS-A
/ APS information detector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) H04N 7/088 // H04N 7/015 (72) Inventor Ikuko Horikawa 6-7 Kita Shinagawa, Shinagawa-ku, Tokyo No. 35 Sony Corporation F term (reference) 5C053 FA13 FA23 GA11 GB21 GB40 HA40 JA21 5C063 AA02 AA11 BA20 CA03 CA09 CA12 CA14 CA23 CA40 DA13 DB02

Claims (15)

[Claims] 1. A 1-bit information is represented by whether a pulse is inserted in a horizontal section before or after a vertical synchronization signal in a vertical blanking period of a video signal, and a plurality of bits of the 1-bit information are represented. As one packet
A method for transmitting additional information of a video signal for transmitting additional information. 2. The apparatus according to claim 1, wherein said additional information is at least CGMS (copy generation management system).
The method for transmitting additional information of a video signal according to claim 1, wherein the additional information includes information. 3. The additional information of a video signal according to claim 1, wherein the additional information includes at least a pseudo-synchronous signal for controlling normal reproduction in the television receiver and information on color stripe processing. Transmission method. 4. The pulse according to claim 1, wherein said pulse is inserted in a section other than a section immediately after a synchronization signal in which a pedestal clamp is performed in a television receiver.
4. The method for transmitting additional information of a video signal according to claim 3. 5. The digital watermark information for copy generation restriction is superimposed on the video signal, and the digital watermark information superimposed on the video signal is added to the additional information of one packet once. 4. The copying machine according to claim 2, wherein when the copying is permitted, the status includes identification information indicating whether the copying is performed before the copying is performed or after the copying is performed. 3. The method for transmitting additional information of a video signal according to item 1. 6. The method for transmitting additional information of a video signal according to claim 1, wherein the video signal has 525 scanning lines, and the scanning method is a progressive scanning method. A method of transmitting additional information of a video signal, the resolution of which is equal to or higher than the resolution of the 525P video signal. 7. A method according to claim 6, wherein said pulse inserted in a vertical blanking period is a period other than a period immediately after a synchronization signal in which pedestal clamping is performed in a television receiver. A method of transmitting additional information of a video signal, wherein the additional information is inserted into a section of the video signal. 8. The method for transmitting additional information of a video signal according to claim 1, wherein the additional information of the one packet is encrypted. Transmission method of additional information. 9. A pedestal clamp for a television receiver in a vertical blanking period of a video signal having 525 scanning lines and a resolution equal to or higher than the resolution of a 525P video signal of a progressive scanning method. A method of transmitting additional information of a video signal by inserting a pulse in a section other than a section immediately after a synchronization signal to be performed, and performing data modulation by changing a position where the pulse is inserted. Characteristic transmission method of additional information of video signal. 10. A pedestal clamp in a television receiver in a vertical blanking period of a video signal having 525 scanning lines and a resolution equal to or higher than the resolution of a 525P video signal of a progressive scanning method. A method of transmitting additional information of a video signal by inserting a pulse in a section other than a section immediately after a synchronization signal to be performed, and performing data modulation by changing a height of the pulse. Characteristic transmission method of additional information of video signal. 11. A pedestal clamp for a television receiver in a vertical blanking period of a video signal having 525 scanning lines and a resolution equal to or higher than the resolution of a 525P video signal of a progressive scanning method. A method of transmitting additional information of a video signal by inserting a pulse in a section other than a section immediately after a synchronization signal to be performed, wherein data modulation is performed by changing a width of the pulse. Transmission method of additional information of the video signal. 12. A video signal output device having a terminal for outputting a video signal in the form of an analog signal, wherein each bit information of additional information composed of a plurality of bits including at least CGMS (copy generation management system) information. In the vertical blanking period of the output analog video signal output from the terminal, depending on whether a pulse is inserted in a horizontal section before or after a vertical synchronization signal, thereby adding the additional information to the output analog video signal. An output device for a video signal, comprising a superimposing means for superimposing on a video signal. 13. A video signal output device according to claim 12, wherein a read unit from a recording medium on which the video signal is converted into a digital signal and recorded is decoded, and the read digital video signal is decoded. Means for converting and outputting the analog video signal; means for detecting CGMS information from the read signal from the recording medium; and, based on the detected CGMS information, the additional information superimposed on the output analog video signal. CGMS to include
Means for generating information; and a video signal output device. 14. A method for collecting a plurality of bits of bit information inserted in a vertical blanking period of an input analog video signal to form a packet and at least CGM
Extracting S (copy generation management system) information and recording the input analog video signal on a recording medium or converting the analog video signal into a digital signal and recording it on a recording medium using the extracted CGMS information A video signal recording device for controlling the video signal. 15. An SD signal such as an NTSC signal or a PAL signal by converting a video signal having 525 scanning lines and a resolution equal to or higher than the resolution of a 525P video signal of a progressive scanning method. In a signal conversion device that obtains, a plurality of bits of bit information inserted in a vertical blanking period of an input analog video signal are collected to form a packet and control at least normal reproduction in a television receiver. A signal conversion device for extracting a pseudo-synchronization signal and information related to color stripe processing, and superimposing the pseudo-synchronization signal and color stripe information on the SD signal based on the extracted information.