JP3178507B2 - Signal receiving device and magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal receiving apparatus and a magnetic recording / reproducing apparatus for recording / reproducing a bit stream of a digital information signal including copyright information.

[0002]

2. Description of the Related Art With recent advances in digital technology, digital television broadcasting (for example, DSS (Digital Sat
ellite System), European DVB (Digital Video Broadca)
sting)) have been put to practical use. This DSS converts digital information signals into proprietary packets, DVB
MPEG2 (MPEG is Moving Picture Experts Group
) Is a transport packet in which a plurality of programs are time-division multiplexed and broadcast.

At this time, transport packets of a plurality of programs (multi-programs) transmitted from a transmitting side (encoder) such as a broadcasting station (a large number of individual encoded data are time-division multiplexed in a relatively short transmission unit). Of these, each program contains packets representing various kinds of content identification information, and the receiving side (decoding means) decodes these packets to correctly receive the transmitted program and decodes the content identification information. Detect and decrypt this program.

There is a magnetic recording / reproducing apparatus which records a digital information signal output from a decoding means in a predetermined recording unit called a "sync block". This magnetic recording / reproducing apparatus converts a desired program extracted from a transmitted digital information signal into data (data in a sync block unit) different from that at the time of transmission and records the data.

As an example of a digital information signal to be transmitted, the transport packet of the above-mentioned MPEG2 is a byte stream with a fixed length of 188 bytes, and one program has a head of 32 bits. Starts with the start code of the pack header and ends with the end code. Further, the head pack includes parameter information which is called a system header and indicates the outline of the entire stream.

The parameter information includes identification information indicating whether the stream bit rate is variable or fixed, parameter restriction information for realizing decoder compatibility, the number and length of programs, and whether the stream is original or copied. The information includes various types of information, such as information indicating copyright, copyright information for controlling copy / write, and scramble control information. The decoder can identify the content of the digital information signal to be received based on the parameter information.

Here, in the recording and reproduction of digital signals, especially in dubbing, the above copyright information is provided especially in consideration of the influence on the copyright problem since the signal hardly deteriorates. By controlling the recording operation of the magnetic recording / reproducing apparatus by detecting the copyright information on the receiving side, digital recording can be restricted (for example, copying of a copyright protected program is prohibited). ).

[0008]

However, there is no guarantee that the above-mentioned parameter information, especially the copyright information, which is only a part of the parameter information, is accurately reproduced in the recording operation of the magnetic recording / reproducing apparatus. As described above, the content identification information added on the transmission side is information for identifying the content of all digital information signals to be transmitted, and the reception side selects a desired program from this digital information signal. In this case, the content identification information corresponding to the program is not necessarily extracted corresponding to the selected program. If all of the supplied digital information signals are recorded in the magnetic recording / reproducing apparatus, the above-mentioned inconvenience does not occur, but recording all information is not a practical method.

Therefore, in the above-described magnetic recording / reproducing apparatus, when the supplied digital information signal is converted into data in a form different from that at the time of transmission and recorded, the copyright information is surely changed according to the change in the form of the data. It was necessary to perform recording processing so that it could be managed.

That is, according to the present invention, a desired program is selected from digital information signals of a plurality of programs by adding the above-mentioned parameter information, in particular, copyright information in association with each sync block. Provided is a magnetic recording / reproducing apparatus capable of always reproducing copyright information accurately even when recorded as data.

[0011]

The present invention provides the following (1) to (4).
The above-mentioned problem is solved by the configuration of ( 4 ). (1) The first invention is a packet forming a plurality of programs.
A data receiving device that detects a predetermined packet including copyright information from the transmitted packet data, extracts a desired program, and outputs the extracted program as a digital information signal through a predetermined interface. The packet data (a
a) first detecting means (12) for detecting management information for managing and identifying the content from a), second detecting means (13) for detecting copyright information from the management information, based on the detection means (12) of the detection result, allocation means for outputting from the supplied plurality of programs was by distributing the desired program (11), a desired program to output of said distributing means (11)
The arm, appends the copyright information from said second detection means (13), further comprising a copyright information of the added desired outside <br/> output interfaces means a program (16) The present invention provides a signal receiving apparatus characterized by the following. (2) The second invention is directed to the interface according to the first invention.
-A program supplied from outside through the interface means (16)
Or a desired program output from the distribution means (11).
Decoding means (1) for decoding the RAM into an analog information signal.
It is intended to provide a signal receiving device characterized by further comprising 5) . (3) The third invention is a packet forming a plurality of programs.
Packet data is transmitted and the transmitted packet data
A predetermined packet containing copyright information from the
Extract the desired program and specify the extracted program
Digital information signal through the interface of
Record digital information signal from output signal receiver
A magnetic recording / reproducing apparatus for reproducing, wherein the digital information is reproduced.
From the broadcast signal as packet data for each predetermined recording unit
Detecting management information for managing and identifying the contents
And copyright information from the management information.
A second detecting means (13) for outputting the first detecting means (12);
Multiple supplied programs based on the detection results of
Means (11) for distributing and outputting a desired program from
And the desired program output by the distribution means (11),
The copyright information from the second detection means (13) is added,
Output the desired program with the copyright information added to the outside
A signal receiving device comprising an interface means (16)
The information signal is used together with the data signal for each predetermined recording unit.
Data and the data of this recording unit
It is another object of the present invention to provide a magnetic recording / reproducing apparatus characterized in that the right information is added and recorded . (4) The fourth invention is a packet forming a plurality of programs.
Packet data is transmitted and the transmitted packet data
A predetermined packet containing copyright information from the
Extract the desired program and specify the extracted program
Digital information signal through the interface of
Record digital information signal from output signal receiver
A magnetic recording / reproducing apparatus for reproducing, the signal receiving apparatus
Information signal supplied through a given interface of
And copyright information detected by the signal receiving device.
, Respectively, and the information signal is converted into data for each predetermined recording unit.
Data and the data of this recording unit
Characterized by recording and assigning rights information respectively
Recording and playback device.

[0012]

FIG. 1 is a block diagram for explaining an embodiment of a signal receiving apparatus and a magnetic recording / reproducing apparatus according to the present invention. FIG. 2 is another embodiment of the signal receiving apparatus and a magnetic recording / reproducing apparatus according to the present invention. FIG. 3 is a block diagram illustrating an example of an MPEG track format, FIG. 4 is a diagram illustrating an example of a DSS track format, and FIG. 5 is a block diagram illustrating a magnetic recording / reproducing apparatus according to the present invention. . Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the signal receiving apparatus 10 according to the present invention includes a first detecting means ("") for detecting management information from a digital information signal aa transmitted as transport packets of a plurality of programs. Management information detecting means "), distribution means 11 for extracting desired program data from digital information signal aa as information signal bb based on management information detecting means 12, and writing of information signal bb based on management information detecting means 12. Second detecting means ("copyright information detecting means") 13 for detecting the right information, and switching between the information signal bb and the reproduced information signal 20a reproduced by the recording / reproducing means 20 via the interface means 16 described later. It comprises switching means 14 for outputting, and a decoder 15 for decoding the output signal 14b of the switching means 14 into a predetermined analog information signal cc.

Here, the interface means 16 described above is used.
Is for exchanging signals between the signal receiving apparatus and a recording / reproducing apparatus to be described later. The copyright information 13a extracted by the second detecting means 13 is converted into a digital information signal from the switching means 14. In addition, input and output of a signal are performed as a signal of a predetermined transmission form. As will be described later, the magnetic recording / reproducing apparatus 20 includes means 21 having the same configuration as the interface means 16, and receives the signal 16a supplied as a signal in a predetermined transmission form or reproduces the signal 16a with the present magnetic recording / reproducing apparatus. The transmitted signal 21a is transmitted. The signal 16a received by the present magnetic recording / reproducing apparatus is distributed to a predetermined recording unit, subjected to predetermined signal processing, recorded on a recording medium 23 such as a magnetic tape, and reproduced from the recording medium 24. The transmitted signal is transmitted from the means 21 as a signal 21a of a predetermined transmission form.

As shown in FIG. 5, the interface means
The information signal 16a output in 16 is the magnetic recording / reproducing means 2
The copyright information 13a distributed to predetermined sync blocks in the means 21 constituting 0 and supplied at the same time is added to the information of each sync block. Then, the recording / reproducing processing means 22 records / reproduces the sync block thus obtained on a recording medium 23 such as a magnetic tape.

For example, the digital information signal aa transmitted as the above-described MPEG2 transport packet
Is connected to the signal receiving apparatus 10 via a receiving unit (not shown).
(Referred to as a “set top box (STB; a portion indicated by a dotted line in FIG. 1)”). In the STB, the digital information signal aa is supplied to the distribution means 11, and a desired program is selectively extracted. The information signal bb extracted by the distribution means 11 is supplied to the first detection means 12 and the switching means.
Supplied to 14 respectively.

At this time, for example, the supplied digital information signal aa is supplied to the first detecting means 12 once in a through state. Among the parameter information included in the transport packet of the digital information signal aa in the first detecting means 12, the synchronization byte, error indication, unit start indication, transport packet priority (priority information),
Program management information such as PID (identification information) and scramble control is detected. Then, the first detection unit 12 supplies, for example, identification information of a program specified by the user to the distribution unit 11, and the distribution unit 11 obtains an information signal bb obtained by extracting the specified program from the digital information signal aa. To the switching means 14.

The second detecting means 13 detects copyright information 13a corresponding to the designated program from the detection result of the first detecting means 12. Copyright information 13a detected at this time
Is supplied to a control unit (not shown) included in the magnetic recording / reproducing device 20, and the control unit controls the operation of the recording / reproducing device 20 based on the copyright information 13a. For example, when the copyright information 13a indicates that the content is "copyright impossible",
The control means stops the recording operation of the recording / reproducing device 20. Further, for example, when the copyright information 13a indicates the content “copyright permitted”, the control unit starts the recording operation of the recording / reproducing device 20. The content of the copyright information 13a detected by the second detecting means 13 is updated if necessary, and is supplied to the recording / reproducing means 20.

In the magnetic recording / reproducing apparatus 20, as shown in FIG. 5, a signal from the interface means 16 is received by the means 21 and is divided into data of a predetermined recording unit. The sorted data is supplied to the recording / reproducing processing means 22 and, after being subjected to a predetermined recording process, is recorded on a recording medium 23 such as a magnetic tape. The signal recorded on the recording medium 23 is reproduced and demodulated by the recording / reproducing processing means 22, and is transmitted from the means 21 after performing processing complementary to that at the time of recording.

At this time, for example, the copyright information of the digital information signal includes a serial copy management system (SCMS) as employed in a DAT (Digital Audio Tape Recorder). This permits digital copying of one generation and inhibits digital copying from the second generation. For example, when an attempt is made to record a digital information signal employing this system (when it is the first digital copy), the contents of the copyright information described above are copied to prohibit the second and subsequent digital copies. It is necessary to rewrite it as "writable" (update copyright information).

In the copyright information adopting the SCMS described above,
For example, the SCMS is identified by the second detecting means 13 described above, and the copyright information is rewritten or updated based on the identified content, and then the content is supplied to the recording / reproducing means 20.

The information signal 16a supplied to the recording / reproducing means 20
Are allocated to predetermined sync blocks by means 21 constituting the recording / reproducing apparatus 20, and the recording / reproducing processing means 22
Is subjected to predetermined signal processing, and is recorded on a magnetic tape 23 or the like by a rotating head (not shown). For example, FIG.
As shown in the figure, this sync block includes a synchronization signal (Sync) area for reproduction, an address information area, a data storage area,
The parity area for error correction has a byte configuration synthesized in a time-series manner, and is configured as a track format adapted to the scanning of the rotary head constituting the recording / reproducing apparatus 20. At this time, one recording unit is constituted by two sync blocks SB # n and SB # n + 1, and a digital signal (the above-described information signal) is recorded and reproduced in this recording unit (the track data 22 of SB # n is 92). Bytes, S
The track data 23 of B # n + 1 forms 96 bytes,
This corresponds to the above-described information of the size of the transport packet of MPEG2 of 188 bytes).

FIG. 4 shows a digital information signal transmitted as 140-byte data obtained by adding a 10-byte dummy (or additional information) to a 130-byte packet size (DSS described above; US digital television broadcasting).
Indicates a sync block for recording and reproducing. At this time, SB #
n, SB # n + 1 and SB # n + 2 constitute one recording unit, and a digital signal is recorded and reproduced in this recording unit (for example, 4-byte additional information 31 for the first packet, data 32, 33, 10-byte dummy data 34, 4-byte additional information 35 for the second packet, data 36, 37, 10-byte dummy data 38).

By the way, for example, when the digital information signal aa is supplied, the distributing means 11 constituting the STB adds a time stamp indicating the arrival time of the packet to the data, and performs time management of reproduction output or decoding. . That is,
In distributing the sync blocks, the time stamp is added to the packet header areas (4 bytes) 21, 31, and 35. At this time, this packet header area 21, 31,
Since 35 has an empty area for storing not only the time stamp but also other information, the copyright information is written there. Means 21 distributes the information signal 14a from the switching means 14 to the above-mentioned sync block when the copyright information from the detection means 13 is distributed.
13a is written into a predetermined packet header 21. At this time, the information signal bb and the information signal 14a have the same contents.

In the recording / reproducing apparatus 20, the information signal 21a distributed to the sync block is subjected to a predetermined recording signal processing by the recording / reproducing processing means 22, and then, for example, a rotating head similar to a helical scan type VTR is driven by magnetic tape. By scanning over a magnetic recording medium such as that described above, signals are recorded while forming a track pattern such as SB # 1,..., SB # n + 2. The recording / reproducing processing means 22 reproduces a signal from the magnetic tape 23 by signal processing complementary to that at the time of recording at the time of recording, reproduces the same data as the information signal 16a received at the time of recording, and interface means via the means 21. This is supplied to 16 and output to the switching means 14. At this time, the copyright information read at the time of reproduction is added, for example, to the header at the head of the reproduced program, decoded into the same state as the transport packet at the time of transmission, and supplied to the switching means 14.

Here, the recording / reproducing processing means 22 reads out the time stamp and the copyright information from the sync block reproduced by the processing complementary to the recording. The information in sync block units is reproduced and output according to the time stamp, and supplied to the switching means 14 as a reproduced information signal 16b in the form of a transport packet when transmitted.
The switching means 14 supplies the reproduced information signal 16b to the decoder 15 as an information signal 14b, and the decoder 15 decodes the reproduced information signal 16b to obtain an analog signal (for example, an analog information signal corresponding to a current system such as a current television signal) cc. To a transmission line (not shown). At this time, an image transmitted as a digital information signal can be monitored by supplying an analog signal to a current television receiver or the like (not shown). Also, for example, a separate magnetic recording / reproducing device may be provided in this transmission path to dub digital information signals. At this time, if the above copyright information indicates "copy / write disabled", no recording is made,
Dubbing is performed to indicate "copy / write permitted".

For example, if a time stamp has already been added to the digital information signal aa on the transmitting side, the rewriting of the time stamp by the distribution means 11 is not performed, and the second The time stamp is detected together with the above-mentioned copyright information by the detecting means 12, and only the copyright information is detected to determine the operation of the recording / reproducing apparatus. If necessary, the copyright information is updated as described above. .

In the above-described signal receiving apparatus, the digital information signal aa passes through the distribution means 11 once and passes through the first detection means 12.
However, as shown in FIG. 2, the digital information signal aa may be simultaneously supplied to the distribution means 11 and the first detection means 12 as shown in FIG.

The switching means 14 changes the information signal bb to the information signal cc.
As a matter of course, it is also possible to simply output the desired program without recording the desired program.

The second detecting means 13 detects and updates the copyright information of the program extracted from the digital information signal aa. For example, the second detecting means 13 includes a copyright supplied from the outside. Of course, the copyright information of the program may be detected and updated based on the right management information.
For example, if there is a system in which only a signal receiving device owned by a designated member can receive a paid digital signal broadcast, the member inputs a password for reception from the outside, and based on this, a second password is received. May detect whether the digital information signal can be copied, or insert an information storage medium such as a prepaid card into the signal receiving device, and determine the second detecting means 13 according to the information of the card. The detection operation may be controlled to determine whether the digital broadcast signal can be copied. Of course, the number of times of reception, the number of times of copying, and the like may be managed by such a card. As described above, the copyright information 13a detected by the second detecting means 13 is added to the information signal 14a by the interface means 16 and supplied to the recording / reproducing apparatus 20. The means 13 supplies the detected copyright information directly to the recording / reproducing apparatus 20, adds the copyright information to the information signal supplied by the means 21, and transmits the information signal in a predetermined recording unit (the "sync block" described above). ) May be recorded.

[0031]

As described above, according to the present invention, copyright information of digital information signals of a plurality of programs to be transmitted can be detected and added to each predetermined recording unit. Even when digital information signals having different contents for each recording unit, such as a program, are sequentially recorded for each recording unit, there is an effect that copyright information can be recognized for each recording unit.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining an embodiment of a signal receiving device and a magnetic recording / reproducing device of the present invention.

FIG. 2 is a block diagram for explaining another embodiment of the signal receiving device and the magnetic recording / reproducing device of the present invention.

FIG. 3 is a diagram showing an example of an MPEG track format.

FIG. 4 is a diagram showing an example of a DSS track format.

FIG. 5 is a block diagram illustrating a magnetic recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Distributing means 12 ... First detecting means 13 ... Second detecting means 14 ... Switching means 15 ... Decoding means 20 ... Recording / reproducing means.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/76-5/956 G11B 20/10-20/12

Claims (4)

(57) [Claims] 1. Packet data constituting a plurality of programs is
Are transmitted at the desired extraction program, signal receiving apparatus which outputs the digital information signal the extracted program via a predetermined interface detects a predetermined packet including copyright information from the packet data to be this transmission, the First detecting means for detecting management information for managing and identifying the content from packet data; second detecting means for detecting copyright information from the management information; and a detection result of the first detecting means based on a sorting means for outputting the supplied plurality of programs was by distributing the desired program, the desired program to output of said distributing means, said second
It appends the copyright information from the detection means, with the copyright information
Signal receiving apparatus characterized by comprising an interface means for outputting a pressure has been desired program to the outside. 2. An external device through the interface means.
Program or the output of the distribution means
The desired program into an analog information signal
2. The apparatus according to claim 1, further comprising decoding means.
On-board signal receiving device. 3. Packet data forming a plurality of programs is
A digital signal from a signal receiving device which detects a predetermined packet including copyright information from the transmitted packet data and extracts a desired program, and outputs the extracted program as a digital information signal through a predetermined interface. A magnetic recording / reproducing apparatus for recording / reproducing an information signal, comprising: first detection means for detecting management information for managing / identifying the content from the digital information signal as packet data for each predetermined recording unit; second detecting means for detecting the copyright information from the management information, and the first on the basis of the detection result detecting means, sorting means for outputting the supplied plurality of programs was by distributing the desired program, The desired program output by the distribution means includes the second program
It appends the copyright information from the detection means, with the copyright information
Used with signal receiving device comprising an interface means for outputting a desired program that is pressurized externally, the copyright information respectively added to the data of the recording unit with distributing the information signal to the data for each predetermined recording unit A magnetic recording / reproducing apparatus characterized by performing recording . 4. Packet data forming a plurality of programs is
A digital signal from a signal receiving device which detects a predetermined packet including copyright information from the transmitted packet data and extracts a desired program, and outputs the extracted program as a digital information signal through a predetermined interface. a magnetic recording and reproducing apparatus for recording and reproducing information signals, the information signal supplied via a predetermined interface of the signal receiving apparatus, and a detected copyright information respectively received at the signal receiving apparatus, the information signal The given
Sorting into data for each recording unit and
A magnetic recording / reproducing apparatus characterized in that the copyright information is added to data and recorded.