JP3020953B2 - Apparatus with digital interface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an apparatus having a digital interface having a copy protection function.

[0002]

2. Description of the Related Art In recent years, digital processing of images and sounds has become widespread.
VC (digital video cassette recorder) has also been developed. The digitization can prevent noise from being mixed in transmission and recording, and can improve signal quality. In such a digital record, the same copy as the original can be made,
The need to protect the copyright of information recorded on recording media has increased.

In particular, with regard to copyright protection of moving image data including audio data, VHRA (Video Home Recording A) has been proposed in Japan and is currently being discussed mainly in the United States.
ct) Regulations are being promoted by related organizations. This V
In HRA, in the case of analog connection using analog equipment as a source, the macro vision method or CGMS (COPYGE
NERATION MANAGEMENT SYSTEM)-The adoption of the A method is stipulated. The analog connection using a digital device as the source is stipulated to employ the macrovision method. The digital connection using the digital device as the source is specified. , CGMS-A (COPY GENERATION MA
NAGEMENT SYSTEM -ANALOG) or CGMS-D (COPY GE
NERATION MANAGEMENT SYSTEM-DIGITAL).

The macro vision method used for analog connection makes it difficult to perform normal recording by superimposing a copy guard signal during a vertical blanking period of a video signal. That is, in this method, the level of the synchronization signal of the image is changed to disable the sync detection in the recording device, and the color phase of the recording device is made difficult by changing the burst phase. With respect to the image signal on which the copy guard signal is superimposed, normal recording is prevented without the recording device taking any special action.

In the CGMS-A system, a flag indicating whether or not copying is possible in a predetermined horizontal period of a vertical blanking period of a video signal is inserted. The device controls the recording.

CGM used in digital connection
SD is in a recording format unique to each device such as a digital VCR and a DVD or a digital interface format (data format at the time of transmission).
In this, 2-bit copy generation management information is added. The reproducing device always inserts the copy generation management information into the output signal, and the recording device detects the copy generation management information from the input signal and controls the recording.

In the copy generation management information, "11" indicates that copying is prohibited, "10" indicates that copying is permitted once, and "00" indicates that copying is free. The recording device determines that the copy generation management information included in the input signal is “1”.
If it is "0", the input signal is recorded, and at the time of recording, the copy generation management information is changed to "11" (copy prohibited).

[0008] Digital VCRs (hereinafter also referred to as DVCs) have been approved by the Consumer Digital VCR Council in Japan to comply with the NTSC or PAL standards.
(Standard Definition) standard and HD (High Definition) standard corresponding to high definition are standardized. In these SD and HD standards (hereinafter referred to as DVC standards), a recording format and a digital interface format for copy generation management information in DVC have been defined. That is, in both the recording format and the digital interface format, the copy generation management information is inserted into a source control (SOURCE CONTROL) packet in a VAUX area described later.

[0009] In addition to the DVC standard, the provision of copy generation management information in the header of an MPEG2 transport stream is substantially specified. However, standards other than these standards do not take CGMS-D into consideration, and copy management information is stored in various digital signals,
It is not specified whether to insert the packet or the I / F format in various digital devices.

At present, IEC (International Electrotec)
According to the standard being discussed by the hnical Committee), it is specified that copy generation management information be recorded in recorded digital data of equipment that handles various images, and that a digital interface output including copy generation management information be output during playback. Have been. In the recording device that records the digital interface output,
It is defined that copy generation management information is detected and recording is performed in accordance with the rules.

In recent years, network systems have become widespread with the development of multimedia. In multimedia, it is necessary not only to transmit and receive data between personal computers but also to transmit and receive data to and from audio equipment and video equipment (hereinafter, referred to as AV equipment).

Therefore, a unified standard of a digital interface system for transmitting and receiving data between a computer and a digital image device is being studied. Low-cost peripheral interfaces suitable for multimedia applications include the IEEE (The Institute of Electrical
d Electronics Engineers, Inc.) 1394 is promising.

IEEE 1394 is capable of multiplex transfer of a plurality of channels. IEEE 1394 has an isochronous transfer function that guarantees that video and audio data and the like are transferred within a certain period of time, so that it is a digital interface suitable for image transmission.

At present, IEEE1394 is a digital V
CRB DVB (European Digital Broadcasting) -W
G discusses US DTV (Digital TV) decoder
IA R4.1 and IEEE 1394T. A. Detailed commands are negotiated in (Trade Association). This IEEE 1394 is originally based on computer technology, but since synchronous communication is possible, AV equipment manufacturers are also participating in the standardization work, and proposals by the Digital VCR Council are being discussed at 1394 TA. .

[0015] The IEEE 1394 is described in Nikkei Electronics 1994.7.4 (No. 612), "Comparison of three new interfaces for exploring post-SCSI design concept" (page 1), pages 152 to 163, and the like. Is described in detail. Japanese Patent Application Laid-Open No. Hei 8-279818, which is a related technique of the present applicant, also describes IEEE 1394 in detail.

In IEEE 1394, multiplex transmission of a plurality of channels is possible, and image data from a plurality of devices can be transmitted through a plurality of channels assigned to isochronous packets. But I
Regarding the digital interface of EEE1394, no rules regarding copy protection are defined. In IEEE 1394, data in a digital interface format of various devices, such as data in a DVC transmission format (hereinafter, referred to as a D / I format) and data in an MPEG2 transport packet, are simply converted and transmitted.

[0017] Therefore, in order to copy an image, IEEE
When data is transmitted using 1394, the recording device takes in data for itself from the data flowing on the IEEE 1394 bus and returns the captured data to a digital interface format specific to the playback device. , The inserted copy generation management information must be extracted. That is, in the recording / reproducing data processing unit such as the digital interface processing unit or the error correction circuit, the insertion position of the copy generation management information is detected to obtain the copy generation management information. For example, if the transmitted data is DVC data, the SOURCE in VAUX
Copying is controlled depending on whether predetermined two bits in the CONTROL packet are “11”, “10”, or “00”.

FIG. 31 is a block diagram showing a related art of an apparatus having a digital interface conforming to the IEEE 1394 standard. FIGS. 32 and 33 are explanatory diagrams for explaining the D-I / F format and the MPEG2 transport stream.

The reproducing (transmitting) devices 1 and 2 are DVC and DVD, respectively. The playback-side devices 1 and 2 and the recording (reception) -side device 3 are connected to a bus conforming to the IEEE 1394 standard.
Connected by 25. The reproduction-side device 1 performs predetermined signal processing on the reproduction data by the reproduction processing circuit 4, and then performs the D / I / F format output processing circuit 5
The playback data is converted into a D / I / F format.

FIG. 32 shows the format of the data from the DI / F format output processing circuit 5. In the D-I / F format, which is a digital VCR standard, data for one recording track of the VCR is converted into 150 packets, and data is transmitted in units of 150 packets.

At the beginning of the 150 packets, a header packet H is arranged, and then two subcode packets S
C, three video auxiliary packets VA are arranged. Next, 9 audio packets A0 to A8 corresponding to 9 sync blocks and 1 audio packet corresponding to 135 sync blocks.
35 video packets V0 to V134 are arranged. The copy generation management information includes a video auxiliary packet V indicated by hatching.
Inserted in the SOURCE CONTROL packet in A. Furthermore,
The reproduction data is supplied to the 1394 I / F6,
After being converted into a 1394 packet, it is transmitted to the bus 25.

In the reproducing device 2, the reproduction processing circuit 7
Thus, predetermined signal processing is performed on the reproduced data. The data from the reproduction processing circuit 7 is supplied to the MPEG TS output processing circuit 8 and converted into a transport stream of the MPEG2 standard.

FIG. 33 shows this transport stream. The transport stream corresponds to a multi-program (channel), and a packet of a desired program can be selected from a plurality of programs transmitted in a time-division manner at the time of decoding. For this selection, as shown in FIG. 33, the transport stream includes a link level header (Link Level Header) indicated by oblique lines before a payload (Payload) for transmitting information.
) Is transmitted. Transport packet 1
Four bytes out of 88 bytes are a link level header. Then, copy generation management information is inserted into this header. The transport stream of MPEG2 is compliant with IEEE 1394 I / F9 and IEEE13.
After being converted into 94 packets, it is transmitted to the bus 25.

The 1394 I / F 10 of the recording device 3 is a bus
IEEE139 from playback-side devices 1 and 2 flowing to 25
4 packets are taken in and depacketized. 1394
The I / F 10 outputs various data depacketized to the corresponding decoder. That is, the received data based on the data from the reproducing device 1 is supplied to the DVC D / I / F decoder 11, and the received data based on the data from the reproducing device 2 is supplied to the MPEG2 TS decoder 12. Note that other types of data are similarly supplied to the corresponding decoders. In FIG. 31, decoding corresponding to other types of data is represented by the D / I decoder 13 for other data.

The decoders 11, 12, and 13 decode the input data. The decoding result is sent to the flag detection circuits 14, 15,
The signal is supplied to the format conversion circuit 17 via the circuit 16. The format conversion circuit 17 converts the input data into its own recording format and supplies it to the recording processing circuit 18.

The flag detection circuits 14, 15, and 16 are decoders, respectively.
The copy generation management information is detected from the outputs of 11, 12, and 13 and output to the recording control circuit 19. The recording control circuit 19 controls the recording (copy) of the recording processing circuit 18 based on the detected copy generation management information.

In IEEE 1394, a maximum of 63 nodes can be connected to the bus 25. The recording-side device needs to recognize the copy interface management information and detect the digital interface format unique to the received data as well. That is, when receiving and recording a plurality of types of data, it is necessary to correspond to all data to be received, and the circuit scale of the recording-side device increases. In addition, it is possible to correspond to the digital interface format for which the standard has already been determined,
It cannot support digital interface formats for which no standard has been established.

By the way, it is conceivable to copy image data by a data streamer which does not have an image decoding circuit and only records image data. At present, such a data streamer does not correspond to a device to which the copy generation management information rule is applied, but may be subject to regulation in the future. However, as described above, in order to detect copy generation management information from data received via the IEEE 1394 bus, a decoder corresponding to each received data is required. There is also a problem that a decoding circuit is required only for detecting the generation management information.

In IEEE 1394, 63 is used for the bus.
Since six nodes can be connected, 63 copies can be created at the same time. Such copying is allowed under current rules, but is problematic from a copyright protection standpoint.

[0030]

As described above, conventionally, I
When performing copying in receiving data via an EEE1394 bus, there is a problem that the receiving side needs to be compatible with the data format, and sufficient protection is not given to the copyright.

The present invention has been made in view of such a problem, and enables recording based on copy generation management information irrespective of the format of data to be recorded in a recording device, thereby enabling the recording to be performed in a format other than an existing format. It is an object of the present invention to provide a device which has a digital interface that can cope with the above-mentioned format and reduce the circuit scale.

Another object of the present invention is to provide a device having a digital interface which can eliminate the need for a decoding circuit even when recording is performed based on copy generation management information in a recording device.

Another object of the present invention is to provide a device having a digital interface capable of simultaneously making only one or a predetermined number of copies even when a plurality of nodes can be connected. .

Further, the present invention provides a method for controlling copy control information even if the number of types of digital image equipment connected to IEEE 1394 is increased or a new digital image equipment having a new digital interface format is newly connected to IEEE 1394. It is an object of the present invention to provide an apparatus having a digital interface capable of performing copy generation management based on a digital interface without any problem.

[0035]

According to the present invention, there is provided an apparatus having a digital interface to which an original signal of one or more data formats is input, and which transmits the original signal of one or more data formats to a network bus. Transmitting interface means for inserting format generation management information into a predetermined position of the packet format of the signal after format conversion by the format converting means and transmitting the copy generation management information to the network bus; Receiving interface means for receiving, via the network bus, a transmission signal transmitted by the transmitting interface means, and returning the received signal from the packet format of the network bus to the original data format of the original signal and outputting the original signal; A common detection unit that detects the copy generation management information that is compatible with the packet format of the network bus and that is inserted in the signal format of the network bus into a signal received by the reception-side interface unit. An apparatus having a digital interface, comprising:

In the present invention, on the transmitting side, the individual detecting means detects copy generation management information included in the input original signal of one or more types of data formats, respectively. The original signal is converted into a common data format of the network bus by the format conversion means, and copy generation management information based on the detection result of the individual detection means or copy generation management based on the type of device which is a signal supply source to the individual detection means Information is inserted into the signal after format conversion by the format conversion means in a data format corresponding to the data format of the network bus, and is transmitted to the network bus. The receiving side receives the transmitted transmission signal via the network bus, and returns the data format of the received signal from the data format of the network bus to the original data format of the original signal. The common detecting means detects copy generation management information inserted in the signal received by the receiving interface means.

[0037]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a device having a digital interface according to the present invention. This embodiment is based on IEEE1.
394. Each device is IEEE139
In addition to having an interface of four standards, detection of copy generation management information and the like need only be compatible with the digital format of its own device.

In FIG. 1, devices 21 to 23 are, for example,
It is connected via a bus 24 of a digital interface capable of synchronously transmitting a plurality of synchronous data such as IEEE1394. Each of the devices 21 to 23 is, for example, a DVC,
DVD or recording device. Devices 21 and 22 transmit (play)
In the following description, it is assumed that the device 23 is a receiving (recording) device.

The device 21 is 139 instead of the 1394 I / F6.
This embodiment differs from the reproduction-side device 1 shown in FIG. The reproduction processing circuit 4 performs predetermined signal processing on reproduction data from a reproduction device (not shown) and outputs the data to a D-I / F format output processing circuit 5. For example, the reproduction processing circuit 4
Performs demodulation processing and error correction processing on reproduction data of a magnetic tape, and obtains original audio data and video data by decompression processing.

D / I format output processing circuit 5
Converts input data into a DI / F format. That is, the DI / F format output processing circuit 5 converts between the recording format of the magnetic tape and the DVC standard transmission format, and outputs the result to the 1394 I / F27.

FIGS. 2 to 7 are explanatory diagrams showing the recording format of the device 21 which is a DVC. FIG. 2 shows recording tracks formed on a magnetic tape, FIG. 3 shows a recording format on each recording track, FIG. 4 specifically shows a configuration of an audio area and an audio Q area, and FIG. FIG. 6 shows the format of VAUX0 and VAUX1 in FIG. 3, and FIG. 7 shows the format of SOURCE CONTROL PACK in FIG.

As shown in FIG. 2, in the DVC standard, data for one frame is recorded on a plurality of recording tracks (ten tracks) on the magnetic tape 51. As shown in FIG. 3, each recording track has a plurality of areas corresponding to the type of data, that is, ITI, audio area (Audio), audio Q area (AudioQ),
Video auxiliary areas (VAUX0, VAUX1), video area (Video), video auxiliary area (VAUX2), video Q area (VideoQ), and subcode area (Su)
bcode), and these areas are sequentially arranged from the lower end to the upper end of the tape 51. These areas are sequentially recorded / reproduced by a head trace (not shown).

In the SD format of the DVC standard, data is recorded on each track in units of one sync block as a recording unit. Each sync block is 90 bytes long as shown in FIGS. 4 and 5, a 2-byte synchronization signal (SYNC) is arranged at the head, and
A byte ID is provided, followed by 77 bytes of data, and finally a parity consisting of an inner code and an outer code. That is, by the error correction coding process, for example, for video data, an outer code for error correction is arranged in the 157th to 167th sync blocks for the vertical data as shown in FIG. In contrast, an inner code for error correction is arranged in the 82nd to 89th bytes of the 19th to 167th sync blocks.

FIG. 6 shows video auxiliary areas (VAUX0, VAUX1, VAUX1, VAUX1, VAUX1, VAUX1,
VAUX2). The video auxiliary area corresponds to the 19th, 20th, and 156th sync blocks.

As described above, SYNC and ID are arranged at the head of each sync block, and then 77 bytes of data are arranged. In the video auxiliary area, 15 packs each having a length of 5 bytes are arranged in this portion, and 2 bytes are a reserve area. As shown in FIG. 6, the 0th to 14th packs are arranged in VAUX0 of the 19th sync block, and the 1st pack is arranged in VAUX1 of the 20th sync block.
Packs 5 to 29 are arranged, and packs 30 to 44 are arranged in VAUX2 of the 156th sync block. Each pack is composed of a 1-byte pack header PC0 and 4-byte pack data PC1 to PC4.

In the DVC format, for odd tracks, the first pack of VAUX0 indicated by hatching in FIG.
URCE CONTROL PACK. For even tracks, the 40th pack of VAUX2 shown by hatching in FIG.
ACK.

FIG. 7 shows the SOURCE CON of the first or 40th pack.
This shows the specific configuration of TROL PACK. SOURCE CONTR
In the first byte PC0 of OL PACK, "01100001" is arranged as a pack header. 2nd byte P
CGMS (Copy gen
eration management system), ISR (Input source)
of just previous recording), CMP (The number
of times of compression) and SS (Source and reco)
rded situations) are sequentially arranged. CGM of these
In S, 2-bit copy generation management information is arranged.

In FIG. 1, the reproduction processing circuit 4
7 is supplied to the DI / F format output processing circuit 5. The copy flag detecting circuit 28 detects CGMS copy generation management information from the output of the DI / F format output processing circuit 5, and supplies the detection result to the 1394 I / F 27.

In the DVC format, video data is recorded in a video area of 135 sync blocks per track, and audio data is recorded in an audio area of 9 sync blocks. The DI / F format output processing circuit 5 converts one track into one packet while converting one sync block into one packet, and inputs and outputs data in units of 150 packets.

FIG. 8 is an explanatory diagram showing packet data corresponding to one track. As shown in FIG. 8, a header packet H0 is arranged at the head of 150 packets,
One subcode packet SC0, SC1 and three video auxiliary packets VA0 to VA2 are arranged. Then 9
9 audio packets A corresponding to the sync block
0 to A8 and 135 video packets V0 to V134 corresponding to 135 sync blocks are arranged.

FIG. 9 shows the data structure of the output from the DI / F format output processing circuit 5 in FIG. As shown in FIG. 9, each block (DIF block) has an ID arranged at the top, and various data arranged next.
The block in FIG. 9 corresponds to the packet in FIG. That is, blocks 0 to 149 correspond to data of 150 packets of one track. Block 0 to Block 14
9 transfers the header, subcode, video auxiliary data, audio and video data for one track. Then, one frame is restored by the data of n tracks.

The 1394 I / F 27 converts the input packet data into an IEEE 1394 packet format and outputs it. According to the SD standard of the digital VCR, 1
Since data for one frame is recorded on ten tracks, data for one track may be transmitted in a 1/10 frame period, that is, 3.33 msec. That is, a total of 150 blocks (DIF, 135 blocks of video, 9 blocks of audio, 3 blocks of VAUX, 2 blocks of subcode, and 1 block of header in 3.33 ms)
Block) must be transmitted.

In IEEE 1394, image data is transferred in isochronous cycles every 125 μsec. 3.33 ms corresponds to a 26.6 isochronous cycle. Therefore, data for one track of the digital VTR, that is, 150 DIF blocks may be transmitted in 26.6 isochronous cycles. 1
In the isochronous cycle, only 5 or 6 DIF blocks are transmitted.

FIG. 10 is an explanatory diagram showing an isochronous packet created by the 1394 I / F 27 in FIG.

A header is arranged at the head of the packet, and a header CRC for error correction is arranged next. Next, CI
The P header is arranged, and then the synchronization data of the 5 or 6 DIF block is arranged. Finally, error correction data C
RCs are arranged. In the present embodiment, 1394
The I / F 27 inserts 2-bit copy generation management information based on the detection result of the copy flag detection circuit 28 into the CIP header.

In the current standard in IEEE 1394, C
SID, DBS, FN, QPC, S as IP header
PH, DBC, FMT, 50/60, STYPE, SY
T and the like are provided, and a 2-bit reserved area is further provided. For example, 1394I /
F27 inserts copy generation management information into this reserved area.

The 1394 I / F 27 transmits an isochronous packet having the format shown in FIG. This isochronous packet flows on the bus 24 in an isochronous cycle every 125 μsec as described above.

The device 22 uses a demodulation and FEC circuit 20 instead of the reproduction processing circuit 7, and 139 instead of the 1394 I / F9.
This embodiment differs from the related-art apparatus 2 shown in FIG. 31 in that a 4I / F 33 is used and a copy flag detection circuit 34 is provided. The demodulation and FEC circuit 20 performs predetermined signal processing on reproduced data from a reproducing device (not shown) and outputs the processed data to the MPEG TS output processing circuit 8. For example, demodulation and FEC circuits
Numeral 20 performs error correction processing and the like on the MPEG2 standard compressed data reproduced from the disk. The MPEG TS output processing circuit 8 converts the input data into a 188 byte MPE.
G2 transport packets are converted to 1394I /
Output to F33.

FIG. 11 is an explanatory diagram showing a transport packet from the MPEG TS output processing circuit 8. FIG.
As shown in FIG. 1, the transport packet includes a Link Level Heade indicated by a diagonal line before a payload for transmitting information.
r is added and transmitted. Transport packet 1
Four bytes out of 88 bytes are a link level header. Copy generation management information is inserted into this header.

The copy flag detection circuit 34 detects copy generation management information in the header of the transport packet,
The detection result is output to the 1394 I / F33. The configuration of the 1394 I / F 33 is the same as that of the 1394 I / F 27, and the 1394 I / F 33 converts an MPEG2 transport stream into an IEEE 1394 packet shown in FIG. In this case, the 1394 I / F 33 inserts 2-bit copy generation management information based on the detection result of the copy flag detection circuit 34 into the CIP header. The 1394 I / F 33 sends an isochronous packet onto the bus 24.

The 1394 I / F 41 of the device 23 takes in the packet flowing on the bus 24 and depackets it, and outputs the data of the original format to the format conversion circuit 43. In the present embodiment, the 1394 I / F 41 has a copy flag detector 42. Copy flag detector 42
Detects copy generation management information inserted in the CIP header of the packet, and outputs it to the copy generation management circuit 44 and the recording control circuit 19.

The format conversion circuit 43 converts the format of the input data into its own recording format. For example, when the device 23 performs the recording of the MPEG2 standard, the data from the device 22 is output to the recording processing circuit 18 without format conversion, and
D-I / F format for data from
The data is converted into the EG2 format and output to the recording processing circuit 18.

When the format conversion is performed by the format conversion circuit 43, the copy generation management circuit 44 inserts copy generation management information based on the detection result of the copy flag detector 42 into a position corresponding to the converted format. It has become. For example, in a case where recording is performed based on data from the device 22 in a case where the recording format of the own device corresponds to the D-I / F format,
Copy generation management information based on the detection result of the copy flag detector 42 is inserted into the CGMS of the SOURCE CONTROL PACK. If the copy generation management information detected by the copy flag detector 42 is “10” permitting only one-time recording, the copy generation management circuit 44 indicates “11” indicating copy prohibition as copy generation management information. "Is inserted.

When the device 23 is an image streamer or a data streamer and records the depacketized data as it is, the format conversion process by the format conversion circuit 43 is not necessary. The conversion circuit 43 can be omitted.

The recording processing circuit 18 has a format conversion circuit 43
Is subjected to predetermined recording signal processing and recorded by a recording device (not shown). The recording process of the recording processing circuit 18 is controlled by the recording control circuit 19. When the copy generation management information detected by the copy flag detector 42 is “11” indicating copy prohibition, the recording control circuit 19 prohibits the recording process of the recording processing circuit 18 and permits only one-time recording. If the value is "10" or "00" indicating copy free, the recording processing of the recording processing circuit 18 is permitted.

Although the device 23 has been described as a recording device, the device 23 may be a television receiver. In this case, the device 23 needs to be capable of analog output and digital output.
Macrovision, CGMS-
Copy control information such as A or CGMS-D standard may be inserted.

Next, the operation of the embodiment configured as described above will be described with reference to the explanatory diagram of FIG. FIG.
Reference numeral 2 denotes data in a predetermined digital format, data recording units, DIF blocks, and isochronous packets on the bus 24. FIG. 12 shows a general digital format.
It is slightly different from the C format or the MPEG2 digital format.

The devices 21, 22, and 23 are DVC, DVD, or a recording device of a predetermined recording format, respectively, and the reproduction data of the device 21 is recorded by the device 23. The reproduction data is subjected to demodulation processing and error correction processing by the reproduction processing circuit 4 and output. The D / I format output processing circuit 5 converts the input data of the DVC format into the D / I format and outputs it.

The first row in FIG. 12 shows a digital format unique to the transmitting device, and shows the output of the DI / F format output processing circuit 5. In addition, DI
A specific digital format of the / F format output processing circuit 5 is shown in FIG. That is, the recording unit of this data is 150 packets. FIG. 12 only shows that a recording unit having a header packet at the beginning is composed of a plurality of packets, and the number of packets and the like are ignored.

The copy flag detection circuit 28 controls the SOURCE CONTROL P in the video auxiliary packet VA in the DVC format.
The copy generation management information inserted in the ACK is detected, and the detection result is output to the 1394 I / F27.

The output of the D-I / F format output processing circuit 5 is supplied to the 1394 I / F 27, and the IEEE 139
4 format. DI
The / F format output processing circuit 5 transmits a plurality of DIF blocks input every isochronous cycle in one isochronous packet. 12 is the DIF
Blocks are shown, and the fourth row in FIG. 12 indicates that 3 or 2 DIF blocks are transmitted in one isochronous cycle.

As described above, in the case of conforming to the DVC standard, the DI / F format output processing circuit 5 outputs 5 or 6 DIs per isochronous cycle.
An F block is transmitted. The 1394 I / F 27 inserts copy generation management information based on the detection result from the copy flag detection circuit 28 into the CIP header of the isochronous packet. Thus, the DI / F format output processing circuit 5 outputs an isochronous packet having the format shown in FIG.

The isochronous packet from the device 21 is sent to the bus 24. The 1394 I / F 41 of the device 23 is the bus 24
An isochronous packet whose own device is specified as a destination is taken from the data flowing above and depacketized. The 1394 I / F 41 outputs packet data in the DI / F format.

The copy flag detector 42 detects copy generation management information inserted in the CIP header of the isochronous packet. The detection result of the copy flag detector 42 is given to the copy generation management circuit 44 and the recording control circuit 19. It is now assumed that the copy generation management information detected by the copy flag detector 42 is "11" indicating that copying is prohibited. In this case, the recording control circuit 19 controls the recording processing circuit 18 to prohibit recording. For example, the recording processing circuit 18 does not perform recording by controlling the operation of a system control or a servo circuit (not shown). In this case, the format conversion process of the format conversion circuit 43 may be prohibited.

It is assumed that the copy generation management information detected by the copy flag detector 42 is "00" indicating copy free. In this case, free recording is possible. 139
The packet data from the 4 I / F 41 is supplied to a format conversion circuit 43, where the format is converted into a recording format of the device 23.

For example, if the transmitting device is a DVC and the device 23 performs recording in accordance with the DVC format, the format conversion circuit 43 converts the input D-I / F format data into the DVC format. And outputs it to the recording processing circuit 18. In this case, when the device 23 performs recording corresponding to the MPEG2 format, the format conversion circuit 43
Converts D-I / F format data compatible with VC to MP
It is converted to the transport stream of EG2. In this case, the copy generation management circuit 44 inserts “00” into the header of the MPEG-2 transport stream as copy generation management information.

When the transmitting device is a DVD and the device 23 performs recording in accordance with the DVC format, the format conversion circuit 43 converts the MPEG2 transport stream into data in the DVC format. In this case, the copy generation management circuit 44
Inserts "00" as copy generation management information into the CGMS area of the SOURCE CONTROL PACK of the VAUX. Data from the format conversion circuit 43 is supplied to the recording processing circuit 18 and recorded on a recording medium (not shown).

If the copy generation management information detected by the copy flag detector 42 is “10” permitting copying only once, the copy generation management circuit 44 includes the data included in the data input to the format conversion circuit 43. The copy generation management information ("10") is rewritten to be copy generation management information ("11") indicating copy prohibition. Note that this copy generation management information is naturally inserted at a position corresponding to the recording format.

Thus, in the device 23, recording based on the copy generation management information is possible.

The same applies to the case where the transmitting device is a set-top box that outputs MPEG2-TS. The demodulated data of the device 22 and the reproduced data from the FEC circuit 20 are converted by the MPEG TS output processing circuit 8 into transport packets in units of 188 bytes. In this case, copy generation management information is detected from the header of the transport packet by the copy flag detection circuit 43 and supplied to the 1394 I / F 33. The 1394 I / F 33 converts a transport packet into a 1394 packet. In this case, the 1394 I / F 33 inserts the copy generation management information detected by the copy flag detection circuit 34 into the CIP header.

Also, if the transmitting device is DVC and MPEG2
It is apparent that copy generation management information can be inserted into transmission data in the same manner even in the case of a device that conforms to a standard other than the standard.

As described above, it is easy for the transmitting device to recognize its own data format and detect the copy generation management information. 1394I of the sending device
/ F inserts the detected copy generation management information into the CIP header of the 1394 packet and sends it out. On the other hand, in the receiving device, the CI of the transmitted isochronous packet is
The copy generation management information contained in the P header is detected. That is, the receiving device can detect the copy generation management information without decoding the received data regardless of the type of the received data. Therefore, in the receiving device,
There is no need to provide a decoder to detect the copy generation management information. Further, even when data in a format other than the existing format is received, copy generation management information can be detected. Since there is no need to decode the received data, control for permitting or prohibiting recording is performed in a short time.

FIG. 13 is a block diagram showing another embodiment of the present invention.

In the embodiment of FIG. 1, an example has been described in which CGMS is used as copy generation management information and copy control of video equipment is performed. As copy generation management information, C
Not only GMS but also SCMS (Serial Copy Management System) for controlling copy of audio data is defined. However, SCMS is basically intended to permit digital-to-digital copying of audio for only one generation, and is handled differently from CGMS. Therefore, it may be necessary to perform copy control using these two types of copy generation management information. This embodiment shows an example in which the present invention is applied to an apparatus that realizes copy control when using two types of copy generation management information of CGMS and SCMS.

Device with Digital Interface
201 is provided in a predetermined device. Various devices can be considered as devices to which the device 201 is attached.For example, devices that can record and reproduce video and audio data, devices that can record and reproduce only audio data, and other types of data can be recorded and reproduced. A device for performing the operation can be considered. Specifically, it includes a VCR, a DAT, a DVD, a digital broadcast receiving apparatus, a data streamer, and the like.

In the present embodiment, the device 201 transmits the transmission data in an isochronous packet of the IEEE 1394 standard in the transmission system,
GMS and SCMS are inserted. In the receiving system, CGMS and SC
The MS is extracted and the copy of the received data is controlled.

In the transmission system, a reproduction signal from, for example, a reproducing means (not shown) is given to the transmission data processing circuit 202 of the device 201. The transmission data processing circuit 202 outputs data corresponding to a data format to be processed by itself, and is similar to, for example, the DI / F format output processing circuit 5 and the MPEG TS output processing circuit 8 in FIG. It has a configuration of The transmission data processing circuit 202 performs predetermined signal processing on the reproduced signal and outputs the reproduced signal to the 1394 transmission processing circuit 211 as transmission data.

On the other hand, the output of the transmission data processing circuit 202 is C
GMS detection circuit 204, SCMS detection circuit 205, APS detection circuit 206, and DSB detection circuit 207 are also provided. C
The GMS detection circuit 204 and the SCMS detection circuit 205 detect CGMS and SCMS contained in the output of the transmission data processing circuit 202, respectively, and detect the isochronous packet insertion circuit 21.
Output to 0.

Further, in the transmission system, not only CGMS and SCMS, which are copy generation management information, but also APS (Analog Protection System) and D which indicate whether or not a PSP (Macrovision AGC pseudo pulse) is inserted.
DSB that regulates copy prohibition of VD-ROM disk
(Digital Source Bit) can also be transmitted. The APS detection circuit 206 and the DSB detection circuit 207 detect the APS and DSB included in the output of the transmission data processing circuit 202 and output them to the isochronous packet insertion circuit 210.

The values of APS and DSB are as follows.

APS 00 PSP off, color stripe off 01 PSP on, color stripe off 10 PSP on, color stripe 2 line system on 11 PSP on, color stripe 4 line system on DSB 1 DVD-ROM disc encoded with copy prohibited 0 Other than the above The isochronous packet insertion circuit 210 uses CGMS, S
Copy generation management information of CMS and copy control information (CCI (Copy Control Informatio
n)) is inserted into the isochronous packet. FIG. 14 shows an isochronous packet insertion circuit 210.
FIG. 7 is an explanatory diagram for explaining an arrangement of copy control information in an isochronous packet according to the first embodiment.

As shown in FIG. 12, the isochronous packet includes a packet header (packet header) composed of a header and a header CRC, and a CIP header (C
IP_header) (shaded area), a data block composed of synchronous data (Data_field) and data CRC (data_CRC). The CIP header includes SID, DBS, FN, QP as shown in FIG.
C, SPH, reserved area (res) (shaded area), DB
C, FMT, and FDF are arranged. In the present embodiment, as in the embodiment of FIG. 1, copy control information is inserted into a reserved area (shaded area) of the CIP header. That is, in the present embodiment, not only CGMS but also SCMS, AP
S and DSB are also inserted.

The data transmitted from the transmission system of the device 201 may include, for example, video data and audio data, or may include only audio data. Therefore, not all of the copy control information inserted in the isochronous packet is always valid. Therefore, in the transmission system, CGMS, SCM inserted in the reserved area
Information indicating whether S is valid or invalid is inserted.

That is, the CGMS detection circuit 203 and the SCMS
The detection result of the detection circuit 204 is also supplied to a CGMS / SCMS valid / invalid determination circuit 208. The CGMS / SCMS valid / invalid determination circuit 208 determines whether CGMS / SCMS is valid or invalid from the detection results of CGMS / SCMS, and outputs the result of determination to the CGMS / SCMS valid / invalid flag insertion circuit 209. Has become.

This embodiment shows an example in which the validity / invalidity of CGMS / SCMS is defined using, for example, the tcode value of the header of an isochronous packet as the CGMS / SCMS validity / invalidity flag. This is because the tcode value is currently undefined. It is not necessary to separately limit to the tcode value.

The CGMS / SCMS valid / invalid flag insertion circuit 209 determines a tcode value indicating validity / invalidity of CGMS / SCMS based on the determination result of the CGMS / SCMS valid / invalidity determination circuit 208 and sends it to the isochronous packet insertion circuit 210. Output.

As shown in FIG. 14, the header has a data length (data_length), a tag (tag), and a channel (channe).
l) 4-bit tCode (hatched portion) and sy are arranged. The isochronous packet insertion circuit 210
The tcode value from the CGMS / SCMS valid / invalid flag insertion circuit 209 is arranged in the tCode portion of the header. FIG. 15 is a chart for explaining the tcode value. As shown in FIG.
In the current standard, the tCode is set to Ah to indicate that the packet is an isochronous packet. In the present embodiment, as shown in FIG.
By setting the code value to Ah, it indicates that the packet is an isochronous packet and that the copy control information is invalid (no information is included). The tcode value of Ch indicates that copy generation management information for audio data is invalid, and the tcode value of Dh indicates that copy generation management information for audio data is also valid.

Note that CGMS is actually invalid and SCM
Since it is unlikely that only S is effective,
Although this state is not represented by tCode in FIG. 15, this state may be set by another value of tCode.

The copy control information inserted by the isochronous packet insertion circuit 210 includes CGMS, S which is copy control information currently defined by each organization.
Four types of CMS, APS, and DSB can be considered. On the other hand, the reserved area of the CIP header used for transmitting the copy control information is 2 bits. Therefore, the isochronous packet insertion circuit 210 may transmit these four types of copy control information in a plurality of cycles, and may insert the copy control information cyclically, for example, in eight isochronous cycle periods. FIG.
6 and 17 are an explanatory diagram and a table for explaining a method of cyclically inserting copy control information.

As shown by the hatched portion in FIG. 16, the reserved area of the CIP header into which the copy control information is inserted has 8
Copy control information is inserted in the isochronous cycle. The isochronous packet insertion circuit 210 sets “01” in the reserved area for the video information in the first to third isochronous cycles of the eight isochronous cycles, and sets the reserved area in the reserved area in the fourth isochronous cycle. Insert CGMS. Similarly, the isochronous packet insertion circuit 210 inserts APS and DBS in the reserve areas in the fifth and sixth isochronous cycles, respectively. Further, a value other than “01” is inserted as a reserved area in the reserved areas in the seventh and eighth isochronous cycles. That is, the value of the next cycle in which “01” is detected three times (a value other than “01”) is C
It can be identified as GMS.

The audio information includes the first to sixth audio information.
The setting of the reserve area in the isochronous cycle and the eighth isochronous cycle is the same as that for the video information. For audio information, the isochronous packet insertion circuit 21
0 inserts SCMS into the reserved area in the seventh isochronous cycle.

The 1394 transmission processing circuits 211 and 1394I
/ F212 is the 1394I / F27 and 1394I / F27 of FIG.
It has the same effect as F33. That is, the data in the predetermined format from the transmission data processing circuit 202 is transmitted to the IEEE 1394 transmission processing circuit 211 and the 1394 I / F 212 according to IEEE.
The packet is converted into an E1394 standard packet and transmitted to a transmission path (not shown).

The isochronous packet insertion circuit 210
By controlling the 1394 transmission processing circuit 211, the above-described copy control information and tcode value are set for the transmission data output from the transmission data processing circuit 202 to the 1394 transmission processing circuit 211.

In IEEE 1394, device authentication (Authentication) is performed prior to data transmission. The transmitter authentication circuit 213 recognizes that the other party is the correct transmitter when the own apparatus is the receiver, and the receiver authentication circuit 214 recognizes the other party as the correct receiver when the own apparatus is the transmitter. You can recognize that there is. The authentication key from the receiver authentication circuit 214 is supplied to the 1394 transmission processing circuit 211, and the authentication key from the transmitter authentication circuit 213 is supplied to the 1394 reception processing circuit 21.
5 is supplied.

By the way, it is conceivable to further enhance the protection of the copyright holder by encrypting the transmission data whose copying is prohibited. In the present embodiment,
If the detection result of the CGMS detection circuit 203 and the SCMS detection circuit 204 indicates that copy is prohibited or copy is permitted only once, the encryption circuit 207 outputs
The transmission processing circuit 211 is controlled to perform encryption processing on transmission data.

When the encryption processing is performed, the encryption circuit 207 inserts an encryption flag indicating that the encryption processing has been performed into the isochronous packet. As shown in FIG.
The y area is an empty area, and in the present embodiment, the encryption circuit 207 sets the encryption flag to the LSB of the sy area.
The encryption flag, for example, “1” indicates that the data is encrypted, and “0” indicates that the data is not encrypted.

On the other hand, in the receiving system, the 1394 I / F
The 212 and 1394 reception processing circuits 215 correspond to 139 in FIG.
It exhibits the same action as 4I / F10. 1394 I / F212
And the received data received by the 1394 reception processing circuit 215 are supplied to a decryption circuit 216 and an isochronous packet extraction circuit 217. Decryption circuit
Reference numeral 216 is such that when the received data is encrypted, the data is decrypted and the original data is output to the received data processing circuit 223.

The isochronous packet extraction circuit 217
Extracting copy control information inserted in the reserved area of the CIP header of the received isochronous packet,
The detection results of APS and DSB are output to the reception data processing circuit 223, and CGMS and SCMS are output to the CGMS detection circuit 21 respectively.
8 and the SCMS detection circuit 219.

The CGMS detection circuit 218 detects a CGMS value from the CIP header of the isochronous packet,
The MS detection circuit 219 detects the value of SCMS from the CIP header of the isochronous packet. C
The detection results of the GMS detection circuit 218 and the SCMS detection circuit 219 are supplied to the reception data control circuit 222 via the terminals a and b of the switch 224, respectively. The reception data control circuit 222 outputs a recording control signal for controlling recording based on the input copy generation management information.

When the receiver is a recording device, the reception data processing circuit 223 converts the reception data from the decryption circuit 216 into a recording format of a recording system (not shown) of the own device, and makes it correspond to the recording format. , C
GMS and SCMS are inserted at predetermined data positions. In this case, the reception data control circuit 222
Is changed from copy generation management information that permits copying only once to copy generation management information that prohibits copying, and is inserted. The reception data from the reception data processing circuit 223 is supplied to a recording system.

The isochronous packet extraction circuit 21
7 extracts tCode data and performs CGMS / SCMS
The output is output to the validity / invalidity detection circuit 220. C
The GMS / SCMS valid / invalid detecting circuit 220 detects the tcode value from the input data and outputs it to the SCMS / CGMS valid / invalid determining circuit 221. The SCMS / CGMS valid / invalid determining circuit 221 receives the tcode value and the mode signal, determines whether SCMS and CGMS are valid or invalid, and switches based on the determined result.
224. Switch 224 is SC
Controlled by the MS / CGMS valid / invalid decision circuit 221,
One of the outputs of the GMS detection circuit 218 and the SCMS detection circuit 219 is supplied to the reception data control circuit 222.

Table 1 below describes the SCMS / CGMS valid / invalid decision circuit 221.

Table 1 Transmitter Receiver A Receiver B Receiver C (Audio equipment) (Audio equipment) (Audio equipment) = SCMS priority equipment = CGMS priority equipment = CGMS priority equipment (1) CGMS enabled CGMS according to SCMS SCMS valid according to CGMS according to CGMS Recording control Recording control Recording control (2) CGMS valid CGMS according to CGMS SCMS invalid according to CGMS SCMS invalid SCMS value Recording control Recording control Recording control (3) CGMS invalid According to SCMS The SCMS is valid for SCMS (Head 1). The SCMS is valid for SCMS (Head 1). The CGMS value is defined by the recording control. The CGMS value is defined and the recording control is defined. The recording control is performed. Prioritize copy control or CGMS
It is determined whether or not to give priority to copy control. For example, when the device 201 is provided in an audio device such as a DAT, the SCMS / CGMS valid / invalid determination circuit 221 determines that the device itself is the SCMS priority device. For example, when the device 201 is provided in a VCR, the SCMS / CGMS valid / invalid determination circuit
221 determines that the own device is a CGMS priority device.

If the device 201 is provided on a DVD or the like used for both audio equipment and video equipment, the SCMS / CGMS valid / invalid decision circuit 221 is used.
Determines whether the own device is the SCMS priority device or the CGMS priority device based on the mode signal. The mode signal is based on, for example, a recording mode determined by the user, and indicates whether the own device is used as an audio device or as a device other than the audio device. Therefore, when it is fixed whether the own device is used for an audio device or for a device other than the audio device, the mode signal is unnecessary.

As shown in Table 1 (1), S
The CMS / CGMS validity / invalidity determination circuit 221 determines, when the tcode value indicates that both CGMS and SCMS included in the transmission data from the transmitter are valid, determines that the own device is the SCMS priority device. SCM
Switch the decision result for copy control using S
When the self apparatus is determined to be a CGMS priority apparatus, a determination result for performing copy control using the CGMS is output to the switch 224.

Further, as shown in the case (2), when only the copy control information in the CGMS insertion period included in the transmission data from the transmitter is valid and the copy control information in the SCMS insertion period is invalid, The SCMS / CGMS validity / invalidity determination circuit 221 supplies the switch 224 with the determination result for performing the copy control based on the CGMS regardless of whether the own device is determined as the CGMS priority device or the SCMS priority device. Output. Then, in this case, when the own device is determined to be the SCMS priority device, the reception data control circuit 222 performs copy control on the assumption that the supplied CGMS value is the SCMS value.

Conversely, as shown in the case (3), when the copy control information in the CGMS insertion period included in the transmission data from the transmitter is invalid and only the copy control information in the SCMS insertion period is valid The SCMS / CGMS valid / invalid determination circuit 221 uses its own device as an SCMS priority device or CGM.
The decision result for performing the copy control based on the SCMS is output to the switch 224 regardless of which of the S priority devices is decided. In this case, the reception data control circuit 22
Reference numeral 2 defines a CGMS based on the input SCMS and performs copy control. For example, the reception data control circuit 222 determines that the SCMS value is “10” and that
If it indicates that copying is permitted only once, CGM
“10” or “11” is defined as the value of S.

Table 1 above shows the CGM included in the transmission data.
An example of copy control using S, SCMS is shown.
Other copy control methods may be employed. For example, if the receiving device is a personal computer that copies received data to a hard disk, the receiving device is simply a data streamer and cannot perform copy generation management. That is, in this case, (3) in Table 1 above
When the CGMS is redefined by the SCMS as in the above, for the SCMS of “10” or “11”, the CGMS
The MS may be regarded as “11”.

Note that SCMS may not be defined for video information.
S is transmitted as being invalid.

Next, the operation of the embodiment thus configured will be described with reference to the explanatory diagram of FIG.

Now, as shown in FIG. 18, one transmitter
231 and the three receivers 232 through 234 are IEEE 1394
It is assumed that the cables are connected in a daisy chain with a 1394 cable 235 conforming to the standard. For example, A receiver 23
2 is DAT, and B receiver 233 and C receiver 234
VC. Transmitter 231 and receiver 232 to
234 comprises the device 201 of FIG. The transmitter 23
1 may have only the transmission circuit of the device 201, and the receivers 232 to 234 may have only the reception circuit of the device 201.

Here, it is assumed that the transmission data transmitted by the transmitter 231 is received and copied by the receivers 232 to 234. First, device authentication is performed prior to data transmission. That is, the transmitter 231 recognizes that the receivers 232 to 234 are correct receivers by the receiver authentication circuit 214 in the device 201. Further, the receivers 232 to 234 recognize that the transmitter 231 is a correct transmitter by the transmitter authentication circuit 213 in the device 201. The authentication is performed by exchanging the device authentication key.

In this embodiment, the receivers 232 through 232
Each SCMS / CGMS validity / invalidity determination circuit 221 in each of the devices 234 determines, at the time of authentication, whether its own device is a CGMS priority device or an SCMS priority device.

The transmitter 231 is, for example, a VCR,
201 CGMS detection circuit 230, SCMS detection circuit 204,
By the APS detection circuit 205 and the DSB detection circuit 206,
Detect copy control information included in the reproduction data. The isochronous packet insertion circuit 210 of the transmitter 231 cyclically inserts the copy control information into the reserved area of the CIP header of the isochronous packet in eight isochronous cycles. Also, the isochronous packet insertion circuit 21
0 inserts a value indicating the validity / invalidity of SCMS and CGMS into the tcode of the header of the isochronous packet. If the CGMS or SCMS indicates that recording is prohibited or that copying is permitted only once, the encryption circuit 207 encrypts the transmission data.

Now, it is assumed that both CGMS and SGMS of the transmission data are valid. In this case, the transmitter
231 CGMS / SCMS valid / invalid flag insertion circuit 209
Determines Dh as the tcode value. The isochronous packet insertion circuit 210 sets the value of tCode of the header of the isochronous packet based on the output of the CGMS / SCMS valid / invalid flag insertion circuit 209.

An isochronous packet from the 1394 I / F 212 of the transmitter 231 is sent out on the 1394 cable 235. The A, B, and C receivers 232 to 234 take in data from the transmitter 231 flowing on the 1394 cable 235 via the 1394 I / F 212 of each device 201. Receiver 2
The 1394 reception processing circuits 215 to 234 receive the isochronous packet and output it to the decryption circuit 216. If the transmission data from the transmitter 231 has been encrypted, the decryption processing is performed by the decryption circuit 216 and the original data is supplied to the reception data processing circuit 223.

Each CGMS detection circuit of the receivers 232 to 234
Reference numeral 218 detects data during the CGMS insertion period from the reserved area of the CIP header of the isochronous packet extracted by the isochronous packet extracting circuit 217. For example, the CGMS detection circuit 218 determines that the value of the reserved area of the CIP header of the isochronous packet is “01”.
Is repeated three times, and the value of the cycle in which the value becomes a value other than “01” is detected as CGMS. Similarly, the SCMS detection circuit 219 detects data during the SCMS insertion period from the reserved area of the CIP header of the isochronous packet.

The CGMS and SCMS detected by the CGMS detection circuit 218 and the SCMS detection circuit
4 to the received data control circuit 222. The CGMS / SCMS valid / invalid detecting circuit 220 is tCo
The value of de is detected and the tcode value is set to SCMS / CGMS
Output to the valid / invalid determination circuit 221.

The DVC B and C receivers 233 and 234
The SCMS / CGMS valid / invalid decision circuit 221 outputs C
It is assumed that the GMS priority device has been determined. tcod
Since the value e is Dh, which indicates that both CGMS and SCMS are valid, as shown in (1) of Table 1 above, the SCMS / CGMS valid / invalid decision circuit of the receivers 233 and 234 221 controls the switch 224 to select CGMS. Thereby, the CGMS detection circuit 21
8 is supplied to the reception data control circuit 222, and the reception data control circuit 222 controls recording of a recording system (not shown) based on the input CGMS. That is, C
If GMS is “11”, recording is prohibited and “1”
If it is "0", the CGMS is changed to "11" for recording, and if it is "00", it is recorded freely.

On the other hand, the A receiver 232, which is a DAT,
The MS / CGMS validity / invalidity determination circuit 221 uses the SCM
It is assumed that the S priority device has been determined. Since the tcode value is Dh, which indicates that both CGMS and SCMS are valid, the SCMS / CGMS validity / invalidity determination circuit 221 of the receiver 232 is set as shown in (1) of Table 1 above. , Switch 224 to select SCMS. Thereby, S from the SCMS detection circuit 219
The CMS is supplied to the reception data control circuit 222, and the reception data control circuit 222 controls recording of a recording system (not shown) based on the input SCMS. That is, SCMS is "1"
If the value is "0", the SCMS is changed to "11" and recording is performed. If the value is "00", recording is performed freely.

Next, the CGMS / SCMS valid / invalid flag insertion circuit 209 of the transmitter 231 is enabled only for CGMS,
It is assumed that a tcode indicating that the MS is invalid is generated. In this case, the SCMS of the receivers 232 to 234
/ CGMS validity / invalidity determination circuit 221 outputs C
The output of the GMS detection circuit 218 is selected. This allows
The CGMS is supplied to the reception data control circuit 222.

The reception data control circuit 222 of the receivers 233 and 234, which are VCRs, performs copy control of a recording system based on CGMS. On the other hand, the reception data control circuit 222 of the receiver 232 which is a DAT uses the value of CGMS as the value of SCMS. That is, the reception data control circuit 222 of the receiver 232
When the input CGMS is “11”, the recording of the received data is prohibited, and when the input CGMS is “10”, the SCMS is changed to “11” and the recording is performed only once, and the recording of “00” is performed. In any case, record freely.

Next, the transmission data from the transmitter is SCMS.
It is assumed that only CGMS is valid and CGMS is invalid. In this case, the SCMS / CGMS valid / invalid decision circuit 221 of the receivers 232 to 234 is connected to the switch 224 by the SCMS detection circuit.
Select 218 outputs. Thus, the SCMS is supplied to the reception data control circuit 222.

The reception data control circuit 222 of the receiver 232 which is a DAT performs copy control of a recording system based on SCMS. On the other hand, the reception data control circuit 222 of the DVC receivers 233 and 234 defines a new CGMS value based on the input SCMS value. For example, the receiver 233,
The received data control circuit 222 of 234 receives the input SCMS.
Is “11” and “10”, CGMS is set to “11” to prohibit copying by the recording system,
In the case of "0", CGMS is set to "00" to permit free copying by the recording system.

It should be noted that recording may be prohibited when the APS is other than "00", and may be prohibited when the DSB is 1.

As described above, in the present embodiment, the same effects as those of the embodiment of FIG.
Copy control using SCMS as well as S is possible.

In this embodiment, when the copy generation management information to be used by the receiver is invalid, the copy generation management information corresponding to the copy generation management information on the receiving side is transmitted based on the valid copy generation management information transmitted. Although an example in which the management information is created has been described, when the copy generation management information detected on the transmission side is invalid, the corresponding valid copy generation management information may be created and transmitted on the transmission side. .

FIG. 19 is a block diagram showing another embodiment of the present invention. In FIG. 19, the same components as those in FIG.

In IEEE 1394, as shown in FIG. 19, a topology of a daisy chain connection and a tree connection can be adopted. In FIG. 19, the device 47 is connected to another device (not shown) in a daisy chain via the bus 24.
A child device (also referred to as a child device) 48 and a device (hereinafter, also referred to as a grandchild device) 49 are connected in a tree shape. For one transmission device,
Synchronous data can be transmitted by designating a plurality of devices including a grandchild device as well as a child device as a receiving device. Equipment 47
Is described as a transmitting device, and the devices 48 and 49 are described as a child device and a grandchild device, respectively.

In this embodiment, the transmitting device 47 adopts the 1394 I / F 51 instead of the 1394 I / F 27,
The receiving devices 48 and 49 are 1394 instead of the 1394 I / F 41.
The difference from the embodiment of FIG. 1 is that an I / F 52 is employed. The receiving devices 48 and 49 have the same configuration.

In IEEE 1394, bus arbitration is performed prior to data transfer. The device that performs data transfer generates a bus use right request command. On the other hand, when the master unit grants the right to use the bus, data transmission becomes possible. IEEE 1394
The bus structure is automatically constructed by the bus reset,
Each node is assigned a node ID. In the automatic construction of the bus structure, each device can recognize the device name of each device. This allows the transmitting device to recognize the recordable device among the connected devices.
For example, the transmitting device recognizes, for example, DVC, DVD, HDD (hard disk device) or the like among the connected devices as a recordable device.

The 1394 I / F 51 of the transmitting device is 139
Similarly to the 4I / F 27, the input data is converted into a 1394 packet, and the copy generation management information based on the detection result of the copy flag detection circuit 28 is inserted into the CIP header in the 1394 packet.

In the present embodiment, the 1394 I / F
When the copy flag detection circuit 28 detects copy generation management information (“10”) indicating that copying is permitted only once, it determines whether there are a plurality of recordable devices. When detecting that there are a plurality of recordable devices, the 1394 I / F 51 transmits copy generation information for permitting copying only once to only a predetermined device by using an asynchronous command, and prohibits copying to other devices. Copy generation information to be transmitted. For example, 1394I
/ F51 transmits copy generation information instructing copy prohibition to the recordable device 49 connected to the grandchild.

The 1394 I / F 52 of the receiving devices 48 and 49 is
Like the 1394 I / F 41, the 1394 I / F 41 includes a copy flag detector 42, which depackets an input 1394 packet and detects copy generation management information inserted in a CIP header. Further, in the present embodiment,
The 1394 I / F 52 detects copy generation information transmitted by an asynchronous command. When copy generation information is detected by an asynchronous command, the 1394 I / F 52
The detection result of the copy generation information is output to the copy generation management circuit 44 and the recording control circuit 19 prior to the copy generation management information inserted in the IP header.
In this way, the receiving devices 48 and 49 perform recording based on the copy generation information.

In the embodiment configured as described above, the device name of each device is recognized by each device by the bus reset. In the transmitting device, the copy generation management information included in the reproduction data indicates "1" indicating that copying is prohibited.
If it is "1" or "00" indicating copy free,
The same operation as in the embodiment of FIG. 1 is performed. That is, in this case, the copy generation management information detected by the copy flag detection circuit 28 of the transmitting device is inserted into the CIP header by the 1394 I / F 51.

The 1394 packet is transmitted via the bus 24 and is taken in by the 1394 I / F 52 of the receiving devices 48 and 49. The 1394 I / F 52 depacketizes the 1394 packet, and the copy flag detector 42
The copy generation management information in the IP header is detected. The copy generation management circuit 44 and the recording control circuit 19 are controlled based on the copy generation management information, and recording is performed according to the copy generation management information.

On the other hand, if the copy generation management information included in the reproduction data is “10” permitting only one copy, the 1394 I / F 51 sets “1” in the CIP header.
Copy generation management information of "0" is inserted, copy generation information for permitting copying only once is transmitted by an asynchronous command with the destination set to the slave unit 48, and copy inhibition is performed by an asynchronous command with the destination set to the grandchild unit 49. The indicated copy generation information is transmitted.

When the 1394 I / F 52 of the slave unit 48 detects copy generation information permitting only one copy from the asynchronous command, it outputs this detection result to the copy generation management circuit 44 and the recording control circuit 19. Thereby, the data from the device 47 can be recorded in the child device 48. In addition,
The copy generation management circuit 44 sets the copy generation management information to “11”
Is similar to the embodiment of FIG.

On the other hand, the 1394 I / F 52 of the grandchild device 49 detects copy generation information indicating copy prohibition from the asynchronous command. The detection result of the copy generation information is transmitted to the recording control circuit 19.
The recording is not performed in the grandchild machine 49.

As described above, in the present embodiment, the same effects as those of the embodiment of FIG. 1 can be obtained, and even when there are a plurality of recordable devices, recording can be performed only on predetermined devices. By doing so, it is possible to increase the protection of the copyright holder, and this is particularly effective in preventing the recording of grandchildren.

FIGS. 20 to 23 and FIGS. 24 to 26 relate to another embodiment of the present invention. FIG. 20 is a block diagram showing another embodiment, and FIG. It is. FIG. 22 is a flowchart showing the procedure of the copy control method in the embodiment of FIG.
FIG. 23 is an explanatory diagram showing an example of transmission / reception processing of an isochronous packet and an asynchronous packet flowing over an IEEE 1394 cable in a time series. FIGS. 24 to 26 are explanatory diagrams showing an isochronous packet and an asynchronous command.

In the present embodiment, copy generation management of a plurality of network-connected devices is performed by one device by using asynchronous data. In the present embodiment, as for the copy generation management information, only the parent device of each device needs to correspond to the digital format of each device, and the other devices only need to have an interface of the IEEE 1394 standard. .

In FIG. 20, a set-top box (hereinafter referred to as STB) 101 is connected to a device 11 via a bus 100.
0 to 113 are connected. The STB 101 has, for example, four channels cha, chb, chc, and chd.
Are multiplexed, and a digital multi-CH broadcast signal is input. This multi-CH broadcast signal is, for example, QPS
It is K-modulated, packetized, and transmitted. STB101
Can display the program transmitted by the input multi-CH broadcast signal on the display device 109,
The multi-CH broadcast signal can be converted into a digital format corresponding to the devices 110 to 113 and transferred to the bus 100.

That is, the multi-CH broadcast signal is transmitted from the STB 101
Is supplied to the demodulation circuit 102. Demodulation circuit 102 is multi-C
A demodulation process corresponding to the H broadcast signal, for example, QPSK demodulation is performed and output to an error correction circuit (hereinafter, referred to as ECC) 103. The ECC 103 performs a code error correction process or the like at the time of transmission, and outputs a multi-CH broadcast signal to the decoder 104 and the data format conversion circuit 105. The decoder 104 decodes the multi-CH broadcast signal and outputs the decoded signal to the display device 109. The display device 109 performs display based on the decoded signal from the decoder 104.

The data format conversion means 5 has an ECC10
3 is converted into a predetermined digital data format, and the copy flag detection circuit 106 and the 1394 control circuit 10
Output to 8. The copy flag detection circuit 106 outputs the ECC3
A copy flag (for example, CGMS-D: COPY) for each channel from the digital multi-CH broadcast signal supplied from
GENERATION MANAGEMENT SYSTEM-DIGITAL) and outputs it to the 1394 control circuit 108. 1394 control circuit
The converter 108 converts the output of the data format converter 105 into a data format for performing, for example, isochronous transfer according to the IEEE 1394 standard, outputs the converted data to the decoder 104, and sends the data to the bus 100.

The bus 100 is, for example, an IEEE 1394 cable, and has a 139 configuration similar to that of the 1394 control circuit 108.
Equipment 110 to 113 having four control circuits 108a to 108d
It is connected to the. The devices 110 to 113 are, for example, a television receiver (TV), DVC, DVD_RAM, and HDD, respectively.

Next, the operation of the embodiment configured as described above will be described with reference to FIGS. 20 to 23 and FIGS. 24 to 26.

STB1 in FIG. 20 is a digital multi-C
H broadcast signal is received and the data format is changed to IEEE13.
94 format, and buses such as IEEE 1394 cable
The data is transmitted to the devices 110 to 113 via 100. And
Each of the devices 110 to 113 receives only the channel desired by itself from among the channels supplied from the STB 101 via the bus 100. In the present embodiment, each device 110
When the devices capable of recording the transmission data try to record the desired channel, the
It is characterized in that copy control is performed using a function such as a command set of E1394.

Hereinafter, the application processing of this embodiment will be described.
This will be described with reference to FIG. The description will be made on the assumption that the STB 101 is a transmitting device and the devices 110 to 113 are receiving devices. In addition, in IEEE 1394, since the transmitting device is generally the parent device, the description will be made assuming that the STB 101 is the parent device.

The STB 101 always uses the isochronous transfer function, which is a synchronous transfer, to receive the multi-CH broadcast signal via the IEEE 1394 bus 100 while receiving the multi-CH broadcast signal.
A broadcast signal is transmitted, and copy control is performed by asynchronous communication with each device using an asynchronous transfer function that is an asynchronous transfer function.

In IEEE 1394, the topology is automatically set at the timing when the power is turned on or when the device is connected or disconnected. This is performed by a controller circuit (not shown) in the physical layer of the 1394 control circuits 108, 108a to 108d. The automatic setting of the topology is performed in three stages. That is, first, the bus is reset, then the connection structure is checked, and finally, each node notifies its own node number to the other nodes.

When the automatic setting of the topology is completed, the IEEE
E1394 performs bus arbitration in the same manner as SCSI. This bus arbitration is always performed before each device performs data transfer. Then, the master unit STB101 determined by the automatic setting of the topology is:
An inquiry is made to each device (child device) connected to the IEEE 1394 bus 100 to identify the device name. The STB 101 is connected to the connected devices 110 to 113.
Is, for example, TV, DVC, DVD_RAM, and HD
D from each of the devices 110 to 113 (FIG. 23)
(a)) (Step S1).

Thus, the master unit (STB 101) prepares, for example, in the memory space of the master unit, the correspondence table for each of the device names and whether or not the device is a recordable device. It is determined that the device 110 is a non-recordable device, and the devices 111 to 113, which are DVC, DVD_RAM, and HDD, are recordable devices (step S2). When the bus arbitration is completed, the STB 101 converts the digital multi-C data converted into an IEEE 1394 packet (FIG. 23 (f)).
H broadcast signal is transmitted through an IEEE 1394 bus 100
The data is transferred to each of the devices 111 to 113 using the isochronous transfer function of EEE1394 (step S3).

Next, when the user attempts to display or record a digital multi-CH broadcast using each device (child device), for example, the device 11 whose user is a TV
In order to view the two programs of channel A and channel B on two screens 0, the channels for two channels are set, and the recording switch of the device 111 is attempted to record the two programs of channel A and channel B on the device 111 which is a DVC. Is set, the recording switch of the device 112 is set to record the program of the channel C in the device 112 which is the DVD_RAM, and the device 113 is set to record the data of all four channels in the device 113 which is the HDD. Then, each of the devices 110 to 113 sends a reception channel request (FIG. 23 (b)) to the STB 101 according to the IEEE.
It is transferred as an asynchronous command by the asynchronous transfer function of E1394 (step S4). In addition, there are various operation methods for receiving, recording, recording, and the like of digital multi-CH broadcasting in each device, and the present embodiment is not particular. Also, in FIG. 23, the asynchronous command transmitted from each of the devices 110 to 113 to the STB 101 is represented (abbreviated) as one packet. Has been sent. Furthermore, the asynchronous command from the receiving device to the STB is configured as a packet as shown in FIG.

On the other hand, in the present embodiment, the isochronous data transmitted from STB 101 is such that digital multi-CH broadcasts for four channels are always transmitted to each receiving device by the ICH.
Although the channel is transmitted via the bus 100 of EEE1394, the receivable channel of each receiving device is specified by an asynchronous command transmitted by the transmitting device transmitting isochronous data to each receiving device. Is determined by the receivable channel. That is, STB101
Receives the request for the receiving channel from each of the receiving devices in step S4, the receiving device, which is the transmission source of the receiving channel request, receives the request from each of the four channels of A, B, C, and D, respectively. A receivable channel is designated (step S5). The asynchronous command transmitted from the STB 101 for each receiving device is configured as a packet as shown in FIG. An isochronous packet, which is a digital multi-CH broadcast for the four channels, is:
It is configured as a packet as shown in FIG.

Here, step S4 can be omitted. That is, for example, when the STB 101 is already in the ON state and then the IEEE 1394 is turned on, the transmitting device transmits an isochronous packet corresponding to one or a plurality of channel numbers to each of the receiving devices. If it is detected in advance that the copy prohibition signal is inserted, the receiving device does not transmit the reception channel request to the transmitting device, and after the transmitting device automatically sets the network topology, the receiving device does not transmit the copy prohibition signal. The designation of the receivable channel number from which the inserted channel number has been deleted (step S5) may be unilaterally transmitted to each receiving device.

Now, assuming that all channels of the currently transmitted digital multi-CH broadcast for four channels are copy-free, the STB 101 transmits the following asynchronous command to each receiving device. That is, as shown in FIG. 23C, chA / chB is designated as a receivable channel for the device 110 which is a TV, and cD is designated as a receivable channel for the DVC 11.
Device that specifies hA / chB and is DVD_RAM
The channel 112 is designated as a receivable channel, and the device 113 which is an HDD is designated as chA / chB / chC / chD as a receivable channel. By receiving this, each receiving device can receive the broadcast signal of the desired channel.

By the way, as shown in FIG.
H broadcast signal is demodulated by STB101,
At this time, identification of image data, audio data, character data, and the like is performed based on the contents of the header of the multi-CH broadcast signal packet. Therefore, the STB 101 can recognize various information including copy generation management information added to the header of the multi-CH broadcast signal.

On the other hand, as described above, in the transport packet of the MPEG2 system, which is the most effective image compression system in digital broadcasting, the Link Level H is used.
The copy generation management information (CGMS-D) is inserted into the eader. The STB 101 can easily detect the copy generation management information included in the MPEG2 transport stream.

For example, at the timing shown in FIG. 23D, the copy generation management information (CGMS-D) of the channel b in the multi-CH broadcast signal contains the copy prohibition signal “11”.
Is detected, the 1394 control circuit of the STB 101
108 is the device 111 that has transmitted the channel B reception request.
Resetting of the receivable channel is carried out for 113 (steps S6, S7). That is, chA is designated as a receivable channel for the device 111 which is a DVC, and H
For the device 113 which is a DD, chA / chC / chD is designated as a receivable channel. The devices 111 and 113, which are the receiving devices receiving this, cannot receive chB of the broadcast signal of the desired channel (copy protection is possible).
Since the device 110 which is a TV is a non-recordable device, and the device 112 which is a DVD_RAM does not originally designate chB, there is no need to reset a receivable channel.

By the way, when the copy protection process is executed, if the recording is not possible despite the fact that the user has specified the recording channel for the recordable device, if the operation setting of the recordable device is wrong or the device is faulty, There is a risk that the user may be misunderstood as to whether or not there is. Therefore, a function for notifying the user of the reason why recording cannot be performed may be added. For example, if a reception request from a recordable device includes a channel number for which copy prohibition has been specified, the STB or other transmission-side device that has received the reception request determines that the copy prohibition is specified from the receivable channel number. Along with or separately from the asynchronous command for specifying the receivable channel number from which the channel number has been deleted, information indicating that the requested channel is copy-prohibited is transmitted to the receiving device or the IEEE 1394 network that transmitted the reception request. To any of the devices connected to the device, and the CRT, LED, or L
The user is notified via a display device such as a CD. Or
As another method, if the recording-capable device cannot obtain the reception permission for the channel for which the reception was requested, the reception device is provided with the reception device that the channel is copy-prohibited. What is necessary is just to notify a user via the display device which is present.

After that, when "10" or "00" is detected as copy generation management information of channel B in the multi-CH broadcast signal, the device 11 which is a DVC is used.
Then, the receivable channel is reset for the device 113 and the HDD 113 (steps S6 and S7). That is, chA / c is set as a receivable channel for the device 111.
hB is specified, and chA / chB / chC / chD is specified as a receivable channel for the device 113. As a result, the devices 111 and 113 can receive all the broadcast signals of the desired channels again. Note that all of the processes from step S3 to step S7 are realized by each device and the application layer of the 1394 control circuits 108, 108a to 108d of the STB 101. Further, the above processes including the processes of steps S1 and S2 are currently performed by IEEE 1394 and
It is all realized by communication protocols and commands specified in IEEE 1394T.A. (Trade association).

As means for copy-protecting the recordable device, in addition to the above-described method, information on recording permission / prohibition for each channel is directly written in the “receivable channel designation command” transmitted by the STB 101 as an asynchronous command. There is also a method of transmitting to the device. This method is based on the current IEEE 1394, as well as the IEEE 1394.
This is not a command specified in TA (trade association), and is a method of realizing by adding such a new command.

In the above description, the transmitting device is the STB101. However, any device may be the transmitting device according to the IEEE 1394 specification. For example, as a transmitting device other than the STB101, a multi-channel recorded image or the like may be used. Device 111 (DVC) for reproducing and outputting, device 110 112,
The above operation can be realized even if 113 or the like is a transmitting device. Further, a bus 100 such as IEEE1394
Is connected to a transmitter other than the transmitting device that transmits the multi-CH signals chA / chB / chC / chD,
For example, even when chE is transmitted together on the same bus, as in the case of two or more transmitting devices, c
The transmitting device that transmits the hE signal detects the copy generation management information when performing the packet data conversion, and performs the chA / ch
Similarly to the transmitting device transmitting B / chC / chD, the asynchronous command is transmitted and the receivable channel is specified to the receiving device, so that chA / chB / chC / ch
Copy control based on copy generation management information can be performed on all D / chE signals.

Further, when the device 112, which is a DVD_RAM, requests reception of only the channel C by an asynchronous command, the STB 101 sets the copy flag detection circuit 106
When the copy prohibition signal “11” is detected for channel C, the STB 101 that is the transmitting device is an asynchronous command to the device 112 that is a recordable device as a means to protect the device 112 that is a DVD_RAM. The receivable channel designation command is designated by specifying a number that cannot be a receivable channel number of the “receivable channel designation command”, that is, a number that does not exist as a channel of isochronous data, and transmitting the “receivable channel designation command”. Alternatively, the "receivable channel designation command" may not be returned. In the former case, the signal corresponding to the impossible channel number designated by the STB 101 is kept waiting, and as a result, it cannot be received. In the latter case, the STB 101
Since no receivable channel is specified from 101, no signal can be received. That is, as a result, the device 11
2 can be copy protected.

By the way, as described above, IEEE 1394
In this case, a tree-like topology as well as a daisy-chain-connected topology is possible. FIG. 27 is a block diagram showing an example of a daisy chain plus tree topology.

FIG. 27 shows a modification of the embodiment shown in FIG. 20, in which the device 114 is replaced with the device 114 in the device 112 shown in FIG.
4 is additionally connected in a tree shape using the bus 100 of FIG. The device 114 is, for example, a TV. Even in this connection, since all the isochronous packets for four channels are transmitted on the IEEE 1394 bus 100, even if only the channel C is transmitted to the device 112, the A, B, C,
Any signal of D can be received. In this case, it is necessary to output a reception request command using an asynchronous command. Further, as shown in FIG. 27, for example, even if the channel B and the channel C are in the copy prohibited state, the device 114 can receive all the signals of the channels A, B, C and D. That is, the device 114 has a tree structure hanging from the device 112 which is a DVD_RAM in a topological view, but the STB in a logical view.
It is possible to replace the configuration with a configuration similar to that in the case of being connected to 101 by a daisy chain.

Next, as a copy control method based on copy generation management information, for example, a method of implementing copy control by scrambling by changing the transmission order of transmission packets on IEEE 1394 will be described.

FIG. 28 is a block diagram showing another embodiment of the present invention. FIGS. 29 and 30 show S in FIG.
FIG. 9 is an explanatory diagram showing an asynchronous command transmitted from the TB 119 to the receiving device. 28, the same components as those in FIG. 20 are denoted by the same reference numerals, and description thereof will be omitted.

The STB 119 in the present embodiment has 13
20 in that a 1394 control circuit 115 is used instead of the 94 control circuit 108. Also, bus 100
Are connected to devices 120 to 123 having 1394 control circuits 115a to 115d having the same configuration as the 1394 control circuit 115, respectively, and the STB 119. The devices 120 to 123 are, for example, TV, DVC, DVD_RAM, and HDD, respectively.

The 1394 control circuit 115 has a packet order changing / restoring circuit 116. The packet order changing / restoring circuit 116 scrambles the time-series arrangement of isochronous data on the IEEE 1394 for each channel. And restore the scrambled data. Also, the 1394 control circuit 115
Can transmit a descrambling key for descrambling by an asynchronous command.

On the other hand, the IEEE 1394 control circuits 115a to 115d provided in each of the receiving side devices 120 to 123 have
It has a function similar to that of the EEE1394 control circuit 115. By receiving the descrambling key, it is possible to cancel the scramble applied to the isochronous data.

The 1394 control circuit 115 having the above-described configuration performs digital multi-CH broadcasting (cha / ch).
b / chc / chd) is transferred to IEEE1
A buffer (FIFO memory) for storing packet data for several cycle periods required (used) at the time of format conversion at the time of format conversion of a data packet so as to be able to flow on the bus 394 is provided.

Therefore, digital multi-CH broadcasting (ch
a / chb / chc / chd), for a channel signal into which a copy prohibition signal is inserted, the buffer is controlled by a packet order rearranging / restoring circuit 116 at the time of format conversion of a data packet, and IEEE is performed.
The scramble is performed by exchanging the time-series arrangement of the E1394 packets, and the IEEE1394 packets are caused to flow on the bus 100 in the order in which the scramble processing is performed.

When there is a request from each of the receiving devices 120 to 123 for a channel into which a copy prohibition signal has been inserted in response to a reception request command based on an asynchronous command, a device as shown in FIG. A kiss descramble key indicating the correct packet order is returned together with a normal receivable channel number or a response by two separate asynchronous commands.

On the other hand, for the recordable device, whether only an ordinary receivable channel number as shown in FIG. 30 or an invalid descrambling key is returned together with the ordinary receivable channel number as a response by the asynchronous command. , Or no response.

As a result, the former (recordable device) can correctly restore the received isochronous packet in the original order based on the correct descrambling key, but the latter (recordable device) cannot Therefore, the received isochronous packet cannot be correctly restored to the original order, and copy protection can be realized.

Strictly speaking, a recordable device can perform recording, but when the recordable device reproduces recorded information, the original image cannot be correctly restored because the order of data packets has been changed. As a result, an effect equivalent to protecting the copy is obtained. Also,
This packet scrambling is performed within the range of the FIFO memory of the P1394 control circuit 115 shown in FIG.
If the order of 394 packets is scrambled, it can be easily realized.

Further, in the embodiment shown in FIG.
Although copy protection was achieved by scrambling the order of the IEEE 1394 packet and transmitting it, it was also possible to achieve copy protection by encrypting the data in the packet without scrambling the order of the packet. is there. For example, as an example of an encryption method, the order of data in a packet is scrambled, a descrambling key indicating the correct order of data in a packet is transmitted to a non-recordable device, and , And send an incorrect descrambling key. This allows the former (recordable device) to correctly restore the order of the data in the received isochronous packet to the original order based on the correct descrambling key, while the latter (recordable device) corrects the descrambling. Since the key cannot be obtained, the order of the data in the received isochronous packet cannot be correctly restored to the original order, and copy protection can be realized.

In the present invention, it will be apparent that a wide variety of different embodiments can be constructed based on the present invention without departing from the spirit and scope of the invention. The invention is not limited by the specific embodiments thereof, except as limited by the appended claims.

[0191]

As described above, according to the present invention, irrespective of the format of the data to be recorded in the recording device, the recording based on the copy generation management information is enabled, so that a format other than the existing format can be used. In addition, the circuit scale can be reduced, and even when recording based on copy generation management information in the recording device, a decoding circuit can be eliminated, and multiple nodes can be connected. In this case, only one or a predetermined number of copies can be made at the same time, and the number of digital imaging devices connected on IEEE 1394 can be increased, and a new digital interface having a new digital interface format can be used. Even if an image device is newly connected on IEEE1394,
This has the effect that copy generation management based on copy control information can be performed without any problem.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a device having a digital interface according to the present invention.

FIG. 2 is an explanatory diagram for explaining a DVC format.

FIG. 3 is an explanatory diagram for explaining a DVC format.

FIG. 4 is an explanatory diagram for explaining a DVC format.

FIG. 5 is an explanatory diagram for explaining a DVC format.

FIG. 6 is an explanatory diagram for explaining a DVC format.

FIG. 7 is an explanatory diagram for explaining a DVC format.

FIG. 8 is an explanatory diagram for explaining a DI / F format.

FIG. 9 is an explanatory diagram for explaining a DI / F format.

FIG. 10 is an explanatory diagram for explaining the format of an IEEE 1394 packet.

FIG. 11 is an explanatory diagram for explaining an MPEG2 transport stream.

FIG. 12 is a timing chart for explaining the operation of the embodiment in FIG. 1;

FIG. 13 is a block diagram showing another embodiment of the present invention.

FIG. 14 is an explanatory diagram for explaining an arrangement of copy control information in an isochronous packet by an isochronous packet insertion circuit 210;

FIG. 15 is a chart for explaining tcode values.

FIG. 16 is an explanatory diagram for explaining a method of cyclically inserting copy control information.

FIG. 17 is a chart for explaining a method of cyclically inserting copy control information.

FIG. 18 is an explanatory diagram for explaining the operation of the embodiment in FIG. 13;

FIG. 19 is a block diagram showing another embodiment of the present invention.

FIG. 20 is a block diagram showing another embodiment of the present invention.

FIG. 21 is an overview diagram showing an overview of the embodiment in FIG. 20;

FIG. 22 is an exemplary flowchart showing the procedure of the copy control method in the embodiment of FIG. 20;

23 is a diagram showing an example of transmission / reception processing of an isochronous packet and an asynchronous packet in the embodiment of FIG. 20 in chronological order.

FIG. 24 is an explanatory diagram showing an isochronous packet and an asynchronous command.

FIG. 25 is an explanatory diagram showing an isochronous packet and an asynchronous command.

FIG. 26 is an explanatory diagram showing an isochronous packet and an asynchronous command.

FIG. 27 is a block diagram showing a modification of FIG. 20;

FIG. 28 is a block diagram showing another embodiment of the present invention.

FIG. 29 is an explanatory diagram showing an asynchronous command transmitted from the STB 119 of FIG. 28.

FIG. 30 is an explanatory view showing an asynchronous command transmitted from the STB 119 in FIG. 28.

FIG. 31 is a block diagram showing a related technique of a device having a digital interface.

FIG. 32 is an explanatory diagram for explaining an insertion position of copy generation management information.

FIG. 33 is an explanatory diagram for explaining an insertion position of copy generation management information.

[Explanation of symbols]

4 reproduction processing circuit, 5 D / I / F format output processing circuit, 18 recording processing circuit, 19 recording control circuit, 2
1, 22, 23 ... equipment, 27, 33, 41 ... 1394I
/ F, 28, 34: copy flag detection circuit, 42: copy flag detector, 43: format conversion circuit, 44:
Copy generation management circuit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 20/10 H04L 12/28 H04N 5/92

Claims (3)

(57) [Claims] An original signal of one or a plurality of data formats is input, and an original signal of the one or a plurality of data formats is input to a common packet of a network bus.
Includes format conversion means for converting the preparative format, copy generation management information, the packet formers signal after format conversion by said format converting means Tsu
And transmitting-side interface unit is inserted into a predetermined position of the bets sent to the network bus, the transmission signal the transmission side interface unit has sent is received via the network bus, the received signal <br/> the network the network and the receiving-side interface unit, be those corresponding to the packet format of the network bus, in the signal which the reception side interface unit receives the output from the bus packet format back to the data format of the original of the original signal Bus Packet Four
An apparatus having a digital interface, comprising: common detection means for detecting the copy generation management information inserted in a mat . 2. An original signal of one or a plurality of data formats is respectively inputted, and an original signal of the one or a plurality of data formats is input to a common packet of a network bus.
Includes format conversion means for converting the preparative format, copy generation management information, the packet formers signal after format conversion by said format converting means Tsu
A transmission interface device for inserting the transmission interface into a predetermined position of the network bus and transmitting the transmission to the network bus. 3. An original signal of one or a plurality of data formats including copy generation management information is transmitted to a network bus.
A transmission signal obtained by converting the packet format, a packet of the network bus follower
The transmission signal in which the copy generation management information is inserted into a predetermined position of Matto received via the network bus, the data format of the received signals based on the original signal from the packet off <br/> formats of the network bus a receiving-side interface means for outputting back to the be those corresponding to the network bus packet format, said network bus packets Four in the signal which the receiving-side interface means receives
An apparatus having a digital interface, comprising: common detection means for detecting the copy generation management information inserted in a mat .