JP2001094930A - Video signal transmission method, video signal recording medium, video signal recorder and video signal reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video signal transmission method that can effectively prevent a video signal from being copied illegally. SOLUTION: Copyright information S1 and generation information S2 are superimposed on an image signal for periods other than effective video periods of the image signal displayed on a screen and the superimposed information is transmitted with the image signal. A receiver side subjects it to limit on the generation of the copy on the basis of the copyright information S1 and the generation information S2 of the received image signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal transmission method, a video signal recording medium, a video signal recording device, and a video signal reproducing device capable of effectively preventing illegal copying of a video signal. .

[0002]

2. Description of the Related Art With the spread of recording / reproducing apparatuses, recorded video tapes on which movies and the like are recorded are generally sold. Making a copy of such a recorded videotape is prohibited by law, but if two recording and playback devices are ready, the recorded videotape can be copied (dubbed) and copied easily. Can be created.

In order to prevent such illegal copying of a video tape, a 1-bit dubbing prevention signal is inserted in a state separable from a video signal as disclosed in, for example, Japanese Patent Application Laid-Open No. 52-132811. The applicant has previously proposed a recorded recording medium.

[0004]

In the conventional method of preventing unauthorized copying by inserting a 1-bit dubbing prevention signal, the copy permission / prohibition, that is, the presence or absence of a copyright is determined by the 1-bit dubbing prevention signal. The generation limit (SCMS: Serial C
opy Management System).

Accordingly, the present invention has been made in view of the conventional circumstances as described above, and has as its object to enable not only the existence of a copyright but also the restriction of generations, and to copy copyright information and generation information to images. An object of the present invention is to provide a video signal transmission method for transmitting a video signal together with a signal.

It is another object of the present invention to provide a video signal recording device capable of recording copyright information and generation information together with a video signal on a recording medium.

It is another object of the present invention to provide a video signal recording apparatus capable of prohibiting recording on a recording medium together with a video signal based on copyright information and generation information.

It is a further object of the present invention to provide a video signal reproducing apparatus capable of outputting copyright information and generation information together with a reproduced video signal.

[0009]

According to a video signal transmission method according to the present invention, a 20-bit digital signal is added to a twentieth line or a 283th line which is a video section other than an effective video section to be displayed on a screen. The 7th bit of the data in the digital signal is a 1-bit or 1-bit copyright information indicating whether or not there is a copyright. Based on the value of the 7th bit, the 8th bit is The seventh bit is 1 so that copying is prohibited by the generation information of
In addition, a video signal for prohibiting copying when the eighth bit is 1 is transmitted.

Further, the video signal recording medium according to the present invention comprises:
The video signal reproduced from the recording medium is a video section other than the effective video section displayed on the screen, ie, the 20th line or the 28th line.
A 20-bit digital signal is superimposed on three lines, and the seventh bit of the data in the digital signal is copyrighted.
This is 1-bit copyright information of 1 or 0 indicating none, and the seventh bit is 1 based on the value of the 7th bit so that copying is prohibited by the generation information of the 8th bit.
And the video signal for prohibiting copying when the eighth bit is 1 is recorded.

[0011] The video signal recording apparatus according to the present invention comprises:
A video signal recorded and reproduced on a recording medium is obtained by superimposing a 20-bit digital signal on a twentieth line or a 283th line which is a video section other than an effective video section to be displayed on a screen. The seventh bit is 1-bit copyright information of 1 or 0 indicating whether or not there is a copyright. Based on the value of the seventh bit, copy is prohibited by generation information of the eighth bit. When the seventh bit is 1 and the eighth bit is 1, a video signal for prohibiting copying is recorded.

Further, in the video signal reproducing apparatus according to the present invention, the video signal reproduced from the recording medium is added to the 20th line or the 283rd line, which is a video section other than the effective video section displayed on the screen, by 20 bits. The digital signal is superimposed, and the seventh bit of the data in the digital signal is copyright information of 1 bit of 1 or 0 indicating that there is a copyright, and based on the value of the 7th bit, In order to prohibit copying by the generation information of the bit, when the seventh bit is 1 and the eighth bit is 1, a video signal prohibiting copying is reproduced.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

A video signal transmission method according to the present invention is characterized in that copyright information and generation information are superimposed on a section other than an effective video section displayed on a screen of a video signal and transmitted together with the video signal. a is to transmit for example as in the first embodiment shown in FIG. 1, a copyright information S ₁ and generation information S ₂ together with the video signal of the NTSC alternately every field.

In the first embodiment, the presence / absence of a copyright is indicated by "1/0" with respect to an NTSC video signal.
1-bit copyright information S ₁ superimposed on the 20th line (20th line in the odd field), such as, also, the 1-bit as in FIG. 3 showing the copiable number of generations "0/1" Generation The information S ₂ is stored in the 283rd line (the 2nd of the even field)
Superimposed on 0 line), is transmitted with the video signal of the NTSC system are alternately copyright information S ₁ and generation information S ₂ for each field.

As described above, the copyright information and the generation information are alternately transmitted for each field together with the NTSC video signal, so that the receiving side receives the horizontal synchronization signal and the vertical synchronization signal of the received NTSC video signal. To determine the 20th of the odd field.
The copyright information is detected from the line, and the second
Generation information can be detected from the 0 line, and generation restriction can be performed using the copyright information and the generation information.

In the video signal transmission method according to the invention,
As in the second embodiment shown in FIG. 4, copyright information and generation information may be alternately transmitted for each field as a specific bit of a video ID together with an NTSC video signal.

In the second embodiment, for a video signal of the NTSC system, as a specific bit of a video ID as shown in FIG. The rights information S ₁ is superimposed on the 20th line (the 20th line of the odd field), and the number of generations “0” that can be copied as a specific bit of the video ID as shown in FIG.
/ 1 bit indicating 1 "generation information S ₂ superimposed on the 283 line (20th line of the even field), NTS
Copyright information together with the video signal of the C system S ₁ and the generation information S
₂ is transmitted alternately for each field.

As described above, by transmitting the copyright information and the generation information alternately for each field as a specific bit of the video ID together with the NTSC video signal, the receiving side transmits the NTSC video signal. ,
By performing field determination based on the horizontal synchronization signal and the vertical synchronization signal, the video I
The copyright information can be detected as a specific bit of D, and the generation information can be detected as a specific bit of the video ID from the 20th line of the even field. The copy information can be detected using the copyright information and the generation information. Generation restriction can be performed.

Further, in the video signal transmission method according to the invention,
As in the third embodiment shown in FIG. 7, together with the video signal of the NTSC system may be every field transmits copyright information S ₁ and generation information S _2.

In the third embodiment, as shown in FIG. 8, the presence / absence of a copyright is set to "1/1" for an NTSC video signal.
As a 1-bit copyright information S ₁ and the copy number of possible generations "0/1 1 bit indicating" generation information S ₂ of one line data indicated by 0 ", the 20th line of the 20 lines (odd field ) and superimposed respectively to the 283 line (20th line of the even field), and each field transmits copyright information S ₁ and generation information S ₂ together with the video signal of the NTSC system.

As described above, by transmitting the copyright information and the generation information together with the NTSC video signal in each field, the receiving side transmits the copyright information and the generation information to the received NTSC video signal in each field. It is possible to detect and limit the generation of the copy.

In the video signal transmission method according to the invention,
As in the fourth embodiment shown in FIG. 9, copyright information and generation information may be transmitted in each field as two specific bits of a video ID together with an NTSC video signal.

In the fourth embodiment, as shown in FIG. 10, for example, as shown in FIG. 10, the 1-bit copyright information S ₁ indicating whether or not the copyright exists is copied to the NTSC video signal by 1/0. possible number of generations "0/1" video ID assigned one bit generation information S ₂ in particular 2 bits indicating the line of data, the first 20 lines (20th line in the odd field) 283 superimposed respectively to the line (20th line of the even field), and each field transmits copyright information S ₁ and generation information S ₂ together with the video signal of the NTSC system.

In the video ID, the header bits may be omitted as shown in FIG. 11, or the reference bits may be omitted as shown in FIG.

As described above, by transmitting the copyright information and the generation information as the specific two bits of the video ID together with the NTSC video signal in each field, the receiving side converts the received NTSC video signal into each field. The generation information is detected for each field as a specific 2 bits of the video ID of the twentieth line, and the copy generation can be restricted using the copyright information and the generation information.

Further, in the video signal transmission method according to the invention,
As in the fifth embodiment shown in FIG. 13, may be copyright information S ₁ and generation information S ₂ as two lines of data of the video signal of the NTSC system so as to transmit every field.

In the fifth embodiment, as shown in FIG. 14, the presence or absence of the copyright is determined by "1/1" for the video signal of the NTSC system.
The 1-bit copyright information S ₁ indicated by “0” is set as data for one line, superimposed on the 19th line (the 19th line of the odd field) and the 282nd line (the 19th line of the even field), and copied. possible number of generations 1 bit generation information S ₂ indicating "0/1" as the next line of data, the 20 lines of the first 20 lines (20th line in the odd field) 283 lines (even field ), And the copyright information S ₁ and the generation information S ₂ are transmitted along with the NTSC video signal in each field.

As described above, along with the video signal of the NTSC system, the 2nd of the 19th line and the 20th line of each field are
Copyright information S ₁ and generation information S ₂ as line data
Is transmitted on a field-by-field basis, the receiving side can detect the copyright information and the generation information on a field-by-field basis with respect to the received video signal of the NTSC system and restrict the generation of the copy.

Further, in the video signal transmission method according to the present invention, as in the sixth embodiment shown in FIG. 15, together with the video signal of the NTSC system, the copyright information and the specific information of the video ID for two lines are set as each one bit. Generation information may be transmitted every field.

In the sixth embodiment, as shown in FIG. 16, for example, as shown in FIG. 16, 1-bit copyright information S ₁ indicating the presence or absence of copyright is specified for an NTSC video signal. Is superimposed on the 19th line (the 19th line of the odd field) and the 283rd line (the 19th line of the even field) as the data of one line, and the number of generations that can be copied. The 20th line (the 20th line of the odd field) and the 283rd line (the even field) of the video ID in which the 1-bit generation information S ₂ indicating “0/1” is allocated to a specific 1 bit as data for one line. 20th line) in the superimposed respective copyright information S ₁ and to each field transmitted generation information S ₂ together with the video signal of the NTSC system.

As described above, the copyright information and the generation information are transmitted as a specific bit of each video ID of the 19th and 20th lines of each field together with the video signal of the NTSC system in each field, so that the receiving side can transmit the information. For the received NTSC video signal, copyright information and generation information are detected in each field as a specific bit of each video ID on the 19th and 20th lines of each field, and the copyright information and generation information are detected. Can be used to limit copy generation.

In the first to sixth embodiments, the copyright information and the generation information are superimposed on the 19th and 20th lines of each field on the NTSC video signal, and the and together with the video signal of the scheme to transmit the copyright information S ₁ and generation information S _2, but in the video signal transmission method according to the present invention, the line for superimposing the copyright information and the generation information of each field The line is not limited to the nineteenth line or the twentieth line, and may be any line that is substantially a section other than the effective video section displayed on the screen of the video signal. Also, the video signal transmission method according to the present invention is not only effective for NTSC video signals, but can also be applied to PAL or HD video signals.

[0034] For example, the video signal of the HD system, for example, as shown in Figure 17, the 1 bit indicating the presence or absence of copyright "1/0" copyright information S ₁ and photocopiable number of generations "0 A video ID in which 1-bit generation information S ₂ indicating “/ 1” is assigned to specific two bits is used as data for one line, and the 32nd line (the 32nd line of the odd field) and the 595th line (the 2nd line of the even field) 32 lines) and the copyright information S along with the HD video signal.
By transmitting ₁ and generation information S ₂ every field,
The receiving side detects the generation information for each field as the specific 2 bits of the video ID of the 32nd line of each field in the received HD video signal, and uses the copyright information and the generation information to generate the copy generation. Restrictions can be made.

In each embodiment of the video signal transmission method according to the present invention as described above, for example, copy generation restriction as shown in Table 1 can be performed using the above copyright information and generation information.

[0036]

[Table 1]

Here, in Table 1 above, the copyright information S
₁ Indicates whether or not there is a copyright. ₁ 0 = no copyright
And S₁ = 1 indicates that there is a copyright. Also generation
Information S_Two Indicates the number of copyable generations._Two = 0
Indicates that the number of copyable generations is [1]._Two =
Number of copyable generations at 1

[0].

When the copyright information S ₁ is “0”, for example, as shown in FIG. 18, the copyright information S ₁ superimposed on the analog video signal received by the television tuner ₁ is If “0”, generation information S ₂
Is either “0” or “1”, the recording of the analog video signal by the first video tape recorder 2 is permitted, and another video tape is recorded from the recorded video tape on which the analog video signal is recorded. Dubbing of the analog video signal, that is, copying of the video signal from the first video tape recorder 2 to the second video tape recorder 3 can be permitted.

For example, as shown in FIG. 19, the copyright information S ₁ superimposed on the analog video signal output from the television tuner (or video tape recorder) 4 is “1” and the generation information S ₂ Is "0", the recording of the analog video signal by the first video tape recorder 5 is permitted. In the first video tape recorder 5, copyright information S indicating that there is a copyright is provided.
₁ = 1 and the number of copyable generations

The generation information S ₂ = 1 indicating [0] is superimposed on the analog video signal, and the copyright information S ₁ and the generation information S ₂ are recorded on a video tape together with the analog video signal. When the analog video signal recorded by the first video tape recorder 5 is reproduced, the reproduced video signal includes copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations.

Since the generation information S ₂ = 1 indicating [0] is superimposed, dubbing of the analog video signal from a recorded video tape on which the analog video signal is recorded to another video tape, that is, the first video Copying of the video signal from the tape recorder 5 to the second video tape recorder 6 can be prohibited.

Further, copyright information S ₁ indicating that there is a copyright.
= 1 and the number of copyable generations

By recording the video signal on which the generation information S ₂ = 1 indicating [0] is superimposed on the recording medium, the video reproduced from the video disk by the video disk player 7 as shown in FIG. Recording of signals on a video tape by the video tape recorder 8 can be prohibited.

As described above, the copyright information S ₁ and the generation information S ₂
Is recorded on a video tape together with a video signal, for example, as shown in FIG.

The recording system of the video tape recorder shown in FIG. 21 uses the copyright information S ₁ and the generation information S
₂ is provided.
A recording signal is generated by a recording signal processing circuit 11 to which the input video signal is supplied via a recording head 12, and the recording signal is recorded on a video tape 13 via a recording head 12.

The superimposition processing section 10 adds a code to the input video signal.
Copyright information S superimposed as pe-protect information
₁ And generation information S_Two Copy protection information detection
A copy protection information detection unit 14
Copyright information S detected from ₁ And generation information S_Two Based on
The new copy protection information is written by the control unit 15.
Recording control signal and generate the new copy protection information.
To the copyright information S by the encoder 16₁ And generation information S_Two 
Into the copyright information S₁ And generation information S_TwoCopy
The input image is input to the superimposition circuit 17 as protection information.
It is designed to be superimposed on a signal.

The copy protection information detecting section 1
4 includes a synchronization separation circuit 18 for separating a vertical synchronization signal and a horizontal synchronization signal from an input video signal. Based on the vertical synchronization signal and the horizontal synchronization signal obtained by the synchronization separation circuit 18, a timing generator 19 A timing pulse indicating a position where the copy protection information of the video signal exists is generated, and the decoder 20 outputs the copyright information S ₁ from the input video signal based on the timing pulse generated by the timing generator 19.
It is adapted to detect the generation information S ₂ and.

Then, the control unit 15 executes the copy protection information and recording control based on the copyright information S ₁ and the generation information S ₂ detected by the copy protection information detection unit 14 in accordance with the procedure shown in the flowchart of FIG. The generation of the copy is controlled by generating the signal.

[0046] That is, the control unit 15, first, in step 1, and determines the presence or absence of copyright by the copyright information S _1. When the result of judgment in Step 1 without S ₁ = 0 i.e. copyright shifts to the step 2, copyright information S ₁ of S ₁ = 0 and S ₂ = 0 or S ₂ =
The first generation information S ₂ generates copy protection information to be outputted from the encoder 16, further generates a recording control signal indicating the copy permission in step 3.

If the result of the determination in step 1 is S ₁ = 1, that is, if there is a copyright, the process proceeds to step 4 and the copy generation is determined based on the generation information S ₂ . Then, the determination result in step 4 is S ₂ = 1, that is, the number of copyable generations is

If [0], the process proceeds to step 5 where a recording control signal indicating copy prohibition is generated.

Further, if the result of the determination in step 4 is S ₂ = 0, that is, if the number of copyable generations is 1, the process proceeds to step 6 where the copyright information S ₁ and S ₁ with S ₁ = 1 are set.
_The copy protection information for outputting the generation information S ₂ of ₂ = 1 from the encoder 16 is generated, and further, a recording control signal indicating copy permission is generated in step 7.

In the recording system of the video tape recorder, the recording signal processing circuit 11 performs a recording signal generation process in accordance with a recording control signal generated by the control unit 15, and indicates copy permission. If the recording control signal is supplied from the control unit 15, generates a recording signal of the input video signal copyright information S ₁ and generation information S ₂ by the superimposition processing unit 10 is superimposed. Also,
The recording signal processing circuit 11 stops the process of generating the recording signal when a recording control signal indicating copy prohibition is supplied from the control unit 15.

In the video tape recorder having such a recording system, the copyright information S ₁ and the generation information S ₂ are superimposed on the input video signal in a section other than the effective video section displayed on the screen. 10 superimposed with, the copyright information S ₁ and generation information S ₂ can be recorded on the video tape 13 together with the video signal. Further, on the basis of the copyright information S ₁ and generation information S ₂ detected from the input video signal by the copy protection information detecting unit 14 generates a recording control signal by the control unit 15, the response to the recording control signal Since the recording signal generation circuit 11 performs the recording signal generation processing, only the video signal permitted to be copied by the control unit 15 can be recorded on the video tape 13.

The process of superimposing the copyright information S ₁ and the generation information S ₂ on the video signal is performed, for example, as shown in FIG.
It may be performed in the reproduction system of the video tape recorder.

The playback system of the video tape recorder shown in FIG. 23 is a superimposition processing unit to which a playback video signal obtained by a playback signal processing circuit 23 to which a playback head 22 for scanning a recording track of a video tape 21 is connected is supplied. and 24, and outputs a reproduced video signal superimposed copyright information S ₁ and generation information S ₂ as the copy protection information by the superimposition processing unit 24.

The superposition processing section 24 includes a copy protection information detection section 25 for detecting copy protection information superimposed on the reproduced video signal obtained by the reproduction signal processing circuit 23.
5 based on the copy protection information detected by
The control unit 26 generates new copy protection information and transmits the new copy protection information to the encoder 27.
Is adapted to superimposed on the reproduced video signal by the copyright information S ₁ and generation information is converted into S _2, the copyright information S ₁ and generation information S ₂ superimposing circuit 28 as the copy protection information by.

The control unit 26 generates copy protection information based on the copy protection information detected by the copy protection information detection unit 25 in accordance with the procedure shown in the flowchart of FIG. It is supposed to do.

That is, the control unit 26 first determines in step 1 whether or not there is a copyright and the copy generation based on the copy protection information. When the result of judgment in Step 1 without copyright shifts to the step 2, copyright information S ₁ and S ₂ = 0 or S in S ₁ = 0
_The copy protection information that causes the encoder 27 to output the generation information S ₂ of ₂ = 1 is generated.

If the result of determination in step 1 is that there is a copyright and the number of copyable generations is 1, the process proceeds to step 3 where copyright information S ₁ and S ₂ = 0, where S ₁ = 1.
Copy protection information for causing the encoder 27 to output the generation information S ₂ of

Further, if the result of the determination in step 1 is that there is a copyright and the number of copyable generations is 0,
Moving to step 4, the copyright information S ₁ and S ₂ = S ₁ = 1
The copy protection information for outputting the first generation information S ₂ from the encoder 27 is generated.

In a video tape recorder having such a reproduction system, the reproduction video signal reproduced from the video tape 21 is added to the copyright information in a section other than the effective video section displayed on the screen by the superposition processing section 24. S ₁ and generation information S ₂ can output the reproduced image signal obtained by superimposing, it is possible to perform the generation restriction of recording the reproduced video signal in a video tape recorder having the above-described recording system.

Further, in each of the above-described embodiments, the generation information S _{2 is set} to 1 on the assumption that the SCMS restricts copying for only one generation.
Was a bit, it is also possible to perform the generation restriction such as to enable copying over multiple generations the generation information S ₂ as a multi-bit.

For example, as in the eighth embodiment shown in FIG. 25, the 20th line (the 20th line of the odd field) and the 283th line (the 20th line of the even field) of the NTSC video signal are superimposed respectively. Video ID
1 bit of copyright information S ₁ using the specified three bits
And 2 bits of generation information S ₂ may be transmitted.

The video ID is, as shown in FIG.
Wide ID (2-bit data A), mode number (4-bit data B), data or flag (8-bit data C)
And an error check code (6-bit data D).

The wide ID (2-bit data A) is identification information relating to the transmission format of the video signal, and has a transmission aspect ratio of 16:
The first bit indicates whether the image display format is 9 or 4: 3, and the second bit indicates whether the image display format is the letter box format or the standard format.

[0063]

[Table 2]

The mode number (4-bit data B) is identification information for sorting the data or flag (8-bit data C) into 16 types of data, and as shown in Table 3 below, Defined as flags and date / time data.

[0065]

[Table 3]

That is, the mode number is [000
0] indicates that the 8-bit data C is a system flag, and when [0001], indicates that the 8-bit data C is the year value of the date at the time of shooting. Show. Similarly, [1100] indicates the start of a character string, [1101] indicates that the 8-bit data C is character data, and [1110] indicates the end of the character string. Thereby, character information such as a program title can be recorded and transmitted.

The mode number

Defined as [0000]
8-bit data C, ie, system flag
Indicates the status of the image, as shown in Table 4 below.
Bit 0 is copyright information S₁ Assigned to
1 and bit 2 are generation information S _Two Assigned to
Is assigned to information indicating whether or not 3 is a stereoscopic (3D) image.
And bit 7 is subtitled in the black area of the letterbox
Is assigned to information indicating whether or not there is.

[0068]

[Table 4]

Here, the information allocated to the bit 3 is obtained by recording an image having left and right parallax in an odd field and an even field, and switching the odd field and the even field by a liquid crystal shutter or the like during reproduction. It is used to control the 3D mode to be viewed. Also, the information assigned to bit 7 is that if the subtitle is in the black area of the letterbox, the subtitle disappears when zooming on a screen with a wide aspect ratio, so that the zoom is not performed or the subtitle in the black area is sliced. , For example, to display in other areas.

The copyright information S ₁ assigned to the bit 0 indicates the presence or absence of the copyright by “1/0”. Further, as shown in Table 5, the generation information S ₂ allocated to the bit 1 and the bit 2 indicates the number of generations [3] that can be copied when S ₂ = 11, and when S ₂ = 10 Indicates the number of copyable generations [2], S ₂ = 01 indicates the number of copyable generations [1], and S ₂ = 00
Indicates the number of generations “0” that can be copied.

[0071]

[Table 5]

In the eighth embodiment, copy generation restriction as shown in Table 6 can be performed using the 1-bit copyright information S ₁ and the 2-bit generation information S ₂ .

[0073]

[Table 6]

That is, as shown in FIG. 27, for example, when the copyright information S ₁ = 0 indicating that there is no copyright is superimposed on the video signal supplied from the video source 30, the generation information S ₂ is set to 00. , 01, 10, and 11, the recording of the video signal by the first video tape recorder 31 is permitted, and the video from the recorded video tape on which the video signal is recorded is transferred to another video tape. Signal dubbing, i.e., copying of the video signal from the first video tape recorder 31 to the second video tape recorder 32 or the second video tape recorder 32
Can also be permitted to copy the video signal to the third video tape recorder 33.

As shown in FIG. 28, for example, the copyright information S ₁ = 1 indicating that the video signal supplied from the video source 30 has a copyright and the number of copyable generations are

When the generation information S ₂ = 00 indicating [0] is superimposed, the recording of the video signal on the video tape by the first video tape recorder 31 is prohibited.

For example, as shown in FIG. 29, the copyright information S ₁ = 1 indicating that the video signal supplied from the video source 30 has a copyright, and the generation indicating that the number of copyable generations is [1]. When the information S ₂ = 01 is superimposed, the recording of the video signal on the video tape by the first video tape recorder 31 is permitted.

In the first video tape recorder 31, the copyright information S ₁ = 1 indicating the existence of the copyright and the number of copyable generations are decremented to obtain the number of copyable generations.

The generation information S ₂ = 00 indicating [0] is superimposed on the video signal, and the copyright information S ₁ and the generation information S ₂ are recorded on a video tape together with the video signal. When the video signal recorded by the first video tape recorder 31 is reproduced, the reproduced video signal includes copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations.

Since generation information S ₂ = 00 indicating [0] is superimposed, dubbing of the video signal from a recorded video tape on which the video signal is recorded to another video tape, that is, the first video tape recorder Copying of the video signal from 31 to the second video tape recorder 32 is prohibited.

That is, by superimposing copyright information S ₁ = 1 indicating that there is a copyright and generation information S ₂ = 01 indicating that the number of copyable generations is [1] on the video signal, It is possible to restrict generations by permitting copying of only one generation and prohibiting copying of two or more generations.

For example, as shown in FIG. 30, the copyright information S ₁ = 1 indicating that the video signal supplied from the video source 30 has a copyright, and the generation indicating that the number of copyable generations is [2]. When the information S ₂ = 10 is superimposed, the recording of the video signal on the video tape by the first video tape recorder 31 is permitted.

In the first video tape recorder 31, the copyright information S ₁ = 1 indicating the existence of the copyright and the number of copyable generations are decremented, and the generation information S indicating that the number of copyable generations is [1]. ₂ [01] superimposed on the video signal, is recorded on a video tape the copyright information S ₁ and generation information S ₂ together with the video signal. When the video signal recorded by the first video tape recorder 31 is reproduced, the reproduced video signal has copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations is [1]. Since the generation information S ₂ = 01 indicating that the video signal is present is superimposed, dubbing of the video signal from the recorded video tape on which the video signal is recorded to another video tape, that is, from the first video tape recorder 31 to the second The copying of the video signal to the video tape recorder 32 is permitted.

In the second video tape recorder 32, the copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations are decremented to obtain the number of copyable generations.

Generation information S ₂ indicating [0]

The [00] superimposed on the video signal, is recorded on a video tape the copyright information S ₁ and generation information S ₂ together with the video signal. When the video signal recorded by the second video tape recorder 32 is reproduced, the reproduced video signal includes copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations.

Since generation information S ₂ = 00 indicating [0] is superimposed, dubbing of the video signal from a recorded video tape on which the video signal is recorded to another video tape, that is, the second video tape recorder 32, the copying of the video signal to the third video tape recorder 33 is prohibited.

That is, by superimposing the copyright information S ₁ = 1 indicating that there is a copyright and the generation information S ₂ = 10 indicating that the number of copyable generations is [2] on the video signal, It is possible to restrict generations by permitting copying of up to two generations and prohibiting copying of three or more generations.

Further, as shown in FIG. 31, for example, the copyright information S ₁ = 1 indicating that the video signal supplied from the video source 30 has a copyright, and the generation indicating that the number of copyable generations is [3]. When the information S ₂ = 11 is superimposed, the video signal is converted to the first video tape recorder 31.
Allows recording on videotape.

In the first video tape recorder 31, the copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations are decremented, and the generation information S indicating that the number of copyable generations is [2]. ₂ [10] superimposed on the video signal, is recorded on a video tape the copyright information S ₁ and generation information S ₂ together with the video signal. When the video signal recorded by the first video tape recorder 31 is reproduced, the reproduced video signal has the copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations is [2]. Since the generation information S ₂ = 10 indicating that the video signal is present is superimposed, dubbing of the video signal from the recorded video tape on which the video signal is recorded to another video tape, that is, from the first video tape recorder 31, The copying of the video signal to the video tape recorder 32 is permitted.

In the second video tape recorder 32, the copyright information S ₁ = 1 indicating the existence of the copyright and the number of copyable generations are decremented, and the generation information S indicating that the number of copyable generations is [1]. ₂ [01] superimposed on the video signal, is recorded on a video tape the copyright information S ₁ and generation information S ₂ together with the video signal. When the video signal recorded by the second video tape recorder 32 is reproduced, the reproduced video signal has copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations is [1]. Since the generation information S ₂ = 01 indicating that the video signal is present is superimposed, dubbing of the video signal from the recorded video tape on which the video signal is recorded to another video tape, that is, from the second video tape recorder 32 to the third video tape is performed. Of the video signal to the video tape recorder 33 is permitted.

In the third video tape recorder 33, the copyright information S ₁ = 1 indicating the existence of the copyright and the number of copyable generations are decremented to obtain the number of copyable generations.

The generation information S ₂ = 00 indicating [0] is superimposed on the video signal, and the copyright information S ₁ and the generation information S ₂ are recorded on a video tape together with the video signal. And the third
When the video signal recorded by the video tape recorder 33 is reproduced, the reproduced video signal includes copyright information S ₁ = 1 indicating that there is a copyright and the number of copyable generations.

Since the generation information S ₂ = 00 indicating [0] is superimposed, dubbing of the video signal from a recorded video tape on which the video signal is recorded to another video tape, that is, the third video tape recorder Copying of the video signal from 33 to the fourth video tape recorder 34 is prohibited.

That is, by superimposing the copyright information S ₁ = 1 indicating that there is a copyright and the generation information S ₂ = 11 indicating that the number of copyable generations is [3] on the video signal, It is possible to restrict generations by permitting copying of up to three generations and prohibiting copying of four or more generations.

[0088] Thus, it is possible to perform the generation restriction to allow copying over a plurality of generations by the generation information S ₂ and multi-bit.

[0089]

According to the video signal transmission method of the present invention, a 20-bit digital signal is superimposed on a twentieth line or a 283th line which is a video section other than an effective video section to be displayed on a screen. The 7th bit of the data in the digital signal is 1 or 0 of 1 or 0 indicating that there is a copyright.
The 7th bit is 1 and the 8th bit is 1 so as to prohibit copying by the 8th bit generation information based on the value of the 7th bit. In this case, the video signal for prohibiting copying is transmitted, so that not only the permission / prohibition of copying but also the generation restriction of copying can be performed based on the presence or absence of copyright.

In the video signal recording medium according to the present invention, the video signal reproduced from the recording medium is added to the 20th line or the 283th line, which is a video section other than the effective video section displayed on the screen, by a 20-bit digital signal. Superimpose the signal,
The seventh bit of the data in the digital signal is 1-bit or 1-bit copyright information indicating whether or not there is a copyright, and based on the value of the seventh bit, the generation information of the eighth bit is used. When the seventh bit is 1 and the eighth bit is 1, a video signal for which copying is prohibited is recorded so that copying is prohibited. Instead, copy generation can be restricted.

In the video signal recording apparatus according to the present invention, the video signal recorded on the recording medium and reproduced is added to the 20th line or the 283rd line which is a video section other than the effective video section displayed on the screen. A 7-bit digital signal is superimposed, and the seventh bit of the data in the digital signal is 1-bit or 1-bit copyright information indicating whether or not there is a copyright, based on the value of the 7-bit. When the seventh bit is 1 and the eighth bit is 1, a video signal for which copying is prohibited is recorded so that copying is prohibited by the generation information of the eighth bit. Depending on the presence / absence, not only copy permission / prohibition but also copy generation restriction can be performed.

Further, in the video signal reproducing apparatus according to the present invention, the video signal reproduced from the recording medium is added to the 20th line or the 283th line, which is a video section other than the effective video section displayed on the screen, by 20 bits. The digital signal is superimposed, and the seventh bit of the data in the digital signal is copyright information of 1 bit of 1 or 0 indicating that there is a copyright, and based on the value of the 7th bit, When the seventh bit is 1 and the eighth bit is 1, a video signal whose copying is prohibited is reproduced so that copying is prohibited by the generation information of the bit. Not only copy permission / prohibition, but also copy generation restriction can be performed.

[Brief description of the drawings]

FIG. 1 is a waveform diagram of a video signal for describing a first embodiment of a video signal transmission method according to the present invention.

FIG. 2 is a waveform diagram showing a superimposed state of copyright information in the first embodiment.

FIG. 3 is a waveform chart showing a superimposed state of generation information in the first embodiment.

FIG. 4 is a waveform diagram of a video signal for explaining a second embodiment of the video signal transmission method according to the present invention.

FIG. 5 is a waveform diagram showing a superimposed state of copyright information in the second embodiment.

FIG. 6 is a waveform diagram showing a superimposed state of generation information in the second embodiment.

FIG. 7 is a waveform diagram of a video signal for explaining a third embodiment of the video signal transmission method according to the present invention.

FIG. 8 is a waveform diagram showing a superimposed state of copyright information and generation information in the third embodiment.

FIG. 9 is a waveform diagram of a video signal for explaining a fourth embodiment of the video signal transmission method according to the present invention.

FIG. 10 is a waveform diagram showing a superimposed state of copyright information and generation information in the fourth embodiment.

FIG. 11 is a waveform diagram showing another superimposed state of copyright information and generation information in the fourth embodiment.

FIG. 12 is a waveform diagram showing another superimposed state of copyright information and generation information in the fourth embodiment.

FIG. 13 is a waveform diagram of a video signal for explaining a fifth embodiment of the video signal transmission method according to the present invention.

FIG. 14 is a waveform diagram showing a superimposed state of copyright information and generation information in the fifth embodiment.

FIG. 15 is a waveform diagram of a video signal for explaining a sixth embodiment of the video signal transmission method according to the present invention.

FIG. 16 is a waveform diagram showing a superimposed state of copyright information and generation information in the sixth embodiment.

FIG. 17 is a waveform diagram showing an example of a state where copyright information and generation information are superimposed on an HD video signal in a seventh embodiment of the video signal transmission method according to the present invention.

FIG. 18 is a block diagram for explaining a usage mode of copyright information and generation information in the video signal transmission method according to the present invention.

FIG. 19 is a block diagram for explaining another mode of use of copyright information and generation information in the video signal transmission method according to the present invention.

FIG. 20 is a block diagram for explaining another mode of use of copyright information and generation information in the video signal transmission method according to the present invention.

FIG. 21 is a block diagram illustrating a configuration example of a video signal recording device according to the present invention.

FIG. 22 is a flowchart showing an operation of a control unit in the video signal recording device.

FIG. 23 is a block diagram showing an embodiment of a video signal reproducing device according to the present invention.

FIG. 24 is a flowchart showing an operation of a control unit in the video signal recording device.

FIG. 25 is a waveform diagram of a video signal for describing an eighth embodiment of the video signal transmission method according to the present invention.

FIG. 26 is a waveform diagram showing a superimposed state of copyright information and generation information in the eighth embodiment.

FIG. 27 is a block diagram for explaining a use mode of copyright information and generation information in the eighth embodiment.

FIG. 28 is a block diagram for explaining another mode of use of copyright information and generation information in the eighth embodiment.

FIG. 29 is a block diagram for explaining usage of copyright information and generation information in the eighth embodiment.

FIG. 30 is a block diagram for explaining another mode of use of copyright information and generation information in the eighth embodiment.

FIG. 31 is a block diagram for explaining another mode of use of copyright information and generation information in the eighth embodiment.

[Explanation of symbols]

1,4 Television tuner, 2,3,5,6,8
Video tape recorder, 7 video disc player,
10, 24 superposition processing unit, 11 recording signal processing circuit, 1
2 Recording head, 13, 21 Video tape, 14, 2
5 Copy protection information detection unit, 15, 26 control unit, 16, 27 encoder, 17, 28 superposition circuit, 1
8 Sync separation circuit, 19 Timing generator, 2
0 decoder, 22 playback head, 23 playback signal processing circuit, 30 video sources, 31, 32, 33 video tape recorder

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Teruhiko Gun, 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Satoshi Tsuchiya 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (8)

[Claims] 1. A 20-bit digital signal is superimposed on a twentieth line or a 283th line which is a video section other than an effective video section to be displayed on a screen in a video signal, and a seventh bit of data in the digital signal is The eye is 1-bit or 1-bit copyright information indicating whether or not there is a copyright.
When the seventh bit is 1 and the eighth bit is 1, a video signal for which copying is prohibited is prohibited so that copying is prohibited by the generation information of the eighth bit based on the value of the bit. Video signal transmission method to be transmitted. 2. The video according to claim 1, wherein the video signal is an NTSC video signal, and copyright information and generation information are transmitted for each odd field and even field of the video signal. Signal transmission method. 3. A 20-bit digital signal is superimposed on a twentieth line or a 283th line, which is a video section other than an effective video section displayed on a screen, in a video signal reproduced from a recording medium. The seventh bit of the data is 1-bit or 1-bit copyright information indicating whether or not there is a copyright. Based on the value of the seventh bit, the copy is prohibited by the generation information of the eighth bit. A video signal recording medium on which a video signal for prohibiting copying when the seventh bit is 1 and the eighth bit is 1 is recorded. 4. The video signal reproduced from the recording medium is N
4. The video signal recording medium according to claim 3, wherein the video signal is a TSC video signal, and copyright information and generation information are superimposed on each of odd and even fields of the video signal to be reproduced. 5. A 20-bit digital signal is superimposed on a twentieth line or a 283th line, which is a video section other than an effective video section displayed on a screen, in a video signal recorded and reproduced on a recording medium, 7th of data in signal
The bit is copyright information of 1 bit of 1 or 0 indicating whether or not there is a copyright. Based on the value of the 7th bit, the 8th bit generation information prohibits copying. A video signal recording device that records a video signal that inhibits copying when the seventh bit is 1 and the eighth bit is 1. 6. The video signal recorded and reproduced on the recording medium is an NTSC video signal, and copyright information and generation information are superimposed on each odd field and even field of the reproduced video signal. 6. The video signal recording device according to claim 5, wherein 7. A video signal reproduced from a recording medium is a video segment other than an effective video segment displayed on a screen.
A 20-bit digital signal is superimposed on the line or the 283rd line, and the seventh bit of the data in the digital signal is a 1-bit or 1-bit copyright information indicating whether or not there is a copyright. A video signal for which copying is prohibited when the seventh bit is 1 and the eighth bit is 1, so that copying is prohibited by the generation information of the eighth bit based on the value of the seventh bit. Video signal playback device that plays back video. 8. The video signal reproduced from the recording medium is an NTSC video signal, and copyright information and generation information are superimposed on each odd field and even field of the reproduced video signal. The video signal reproducing device according to claim 7.