JP2003009078A - Method and device for receiving digital signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the reproduction of digitally compressed information after recording the information. SOLUTION: An enciphered signal, viewing right information and guide information of a recorded program are recorded and charging is processed for each reproduction. Or a decoded signal after enciphering, viewing right information and guide information of the recorded program are recorded and reproduction is permitted only during a prescribed period based on viewing right information. Thus, reproduction is easily and surely restricted so that the information copying without limitation is prevented. Then the right of the owner of the copyright and that of a service provider are protected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for receiving, recording and reproducing digital information signals such as movies and programs transmitted by transmission means such as coaxial cables, optical cables, telephone lines and satellite broadcasting. More particularly, it relates to a digital signal receiving method and apparatus for limiting reproduction of a recorded digital information signal.

[0002]

2. Description of the Related Art As a method for inhibiting copying of a video signal in a recording / reproducing apparatus, for example, Japanese Patent Laid-Open No. 61-288582 (hereinafter referred to as the first publication) is known. In the technology described in this first publication, the signal is added immediately after the synchronizing signal of the video signal so that the television receiver does not malfunction and the video cassette recorder (hereinafter referred to as VTR) deteriorates in image quality. It is designed to record signals.

Further, Japanese Patent Laid-Open No. 4-360068 (hereinafter referred to as the second publication) discloses a technique relating to a data recording / reproducing apparatus which restricts copying and prevents browsing.

As a method for digitally compressing a video signal with high efficiency, for example, MPEG-2 (Moving Picture Exper).
ts Group) is known as the ITU-T Draft Rec. H.262 standard. As a transmission standard for video signals and audio signals compressed by MPEG-2, the MPEG-2 Systems Working
Draft is known.

[0005]

The above-mentioned standard describes a technique for compressing a program and digitally broadcasting it. When this compression method is used, a large compression rate can be obtained, and therefore, in the same transmission channel, 4 ~
Eight times as many programs can be broadcast. For this reason, for example, a service called near video on demand, which repeatedly broadcasts the same two-hour movie by shifting the time by 30 minutes, has already been started. However, since not all programs can be broadcast on-demand near video all day long, there is a demand to record the broadcast signal, shift the time, and play back at the time convenient for you, as in the past. There is.

As a method of recording and reproducing the digitally compressed and digitally broadcasted program, a method of decompressing the received digital signal, converting it into an analog signal, and recording it in a conventional analog VTR can be considered. However, converting to an analog signal and recording with an analog VTR would impair the good S / N of the digital signal.

Although it is desired to digitally record the digitally broadcasted signal as it is, the above-mentioned MPEG, for example, is used.
There is still no disclosure of a technique for recording a digital signal which is compressed by a standard and transmitted. Usually, when recording / reproducing a digital signal, since error correction is sufficiently performed, there is an advantage that the same tape can be repeatedly viewed without deterioration in image quality. On the other hand, on the other hand, if the same tape can be viewed repeatedly without degrading the image quality, a cell video (cassette sold out for recording movies etc.) can be easily created and the copyright holder's rights are protected. Becomes difficult. In the case of the conventional analog VTR, the technology to protect the rights of the copyright holder is the first
In the official gazette. Further, the second publication discloses a technique relating to a data recording / reproducing apparatus that restricts copying and prevents browsing.

[0008] However, the above-mentioned technique of recording the digital signal as transmitted by compressing it according to the MPEG standard,
And, no technique for limiting the reproduction of such a recorded signal is shown.

The object of the present invention is to compress, for example, the MPEG standard,
It is an object of the present invention to provide a method and an apparatus capable of efficiently recording a transmitted signal and limiting reproduction.

[0010]

In order to solve the above problems, the following means were used. That is, the program of a plurality of channels that has been bit-compressed, and the guide information of the plurality of programs, which is the guide information of the plurality of programs and that includes at least the information of the date and time when the information is received, are transmitted. , And guide information for a plurality of programs, select one program from the plurality of received programs, record the selected program with a recording / reproducing device, reproduce the reproduced program, and bit-decompress the reproduced program. In the system for restoring and viewing, the guide information of the selected program is selected from the received guide information of the plurality of programs, and means for creating new guide information, and the selected program and new information are created. Means for simultaneously outputting different guide information to the recording / reproducing apparatus, means for setting the current time using the date and time information contained in the received guide information of a plurality of programs, and new reproduced information. Means for comparing the date information and the current time included in id information, if the comparison result is only a predetermined period and a means for inhibiting the bit extension of the reproduced program.

[0011]

The present time can be surely set from the received guide information of a plurality of programs, and the present time cannot be artificially changed because the time is set from the received information. Also, new guide information is created from the guide information received when recording the selected program, and the new guide information includes date and time information when the program was received, so it is compared with the current time at the time of playback. Therefore, the elapsed time during reproduction can be surely known. When the elapsed time exceeds the predetermined time, it is possible to restrict the reproduction of the recording tape by prohibiting the bit expansion.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the present invention, a video distribution service using satellites will be described with reference to FIG. In FIG. 1, 10 is a software supply company, 20 is an operation center, 30 is a program distribution center, 31 is a transmission device, and 35.
Is a current broadcasting station, 36 is a transmitting device, 40 is a satellite for distributing signals, 50 is a subscribing household, 51 is a receiving device, 52
Is a receiver decoder, 53 is a VTR, 54 is a television receiver, 55 is a telephone, and 56 is a receiving device.

The video distribution service is provided by an operator who operates the operation center 20. The operator contracts with the software supply company 10, and the required software is supplied from the software supply company 10 to the program distribution center 30.
Although only one software supply company 10 is shown in the embodiment shown in FIG. 1, software is normally supplied from a plurality of software supply companies.

The program distribution center 30 launches a radio wave toward a satellite 40 by means of a transmitter 31 provided in the center. The satellite 40 receives the radio wave and transmits the radio wave to the subscriber 50. The transmitted radio wave is received by the receiver 51. Although only one subscriber 50 is shown in the embodiment shown in FIG. 1, there are actually multiple subscribers.

The radio wave received by the receiver 51 is input to the receiver decoder 52, and the software of the channel selected by the receiver decoder 52 is selected. The selected software is recorded in the VTR 53 as needed. The signal recorded in the VTR 53 and reproduced at any time is the receiver / decoder 5
After being returned to 2, the original video signal is restored, and then output to the television receiver 54. When it is desired to view the image as it is without recording it, the image signal is restored to the original video signal without passing through the VTR 53 and then output to the television receiver 54.

The subscriber uses the telephone 55 to select the software he or she wants to see.
It is also possible to request transmission from the operation center 20. In addition, the operation center 20 can check the reception / viewing status of the subscriber 30 via the telephone line from the receiver / decoder 52, and can also charge according to the viewing / listening status.

In addition, from the current broadcasting station 35 to the transmission device 36.
The radio wave broadcast by is received by the receiving device 56, and the received signal is input and recorded in the VTR 53. The signal reproduced by the VTR 53 is input to the television receiver 54 and can be viewed. Of course, if the VTR 53 does not need to be recorded, the signal from the receiving device 56 is input to the television receiver 54 and can be viewed as it is.

FIG. 2 is a block diagram of an embodiment showing details of the program distribution center 30. In FIG. 2, 100 is an input means of software sent from the software supply company 1, 1
Reference numeral 01 is an input means for inputting a control signal such as a program transmitted from the operation center 20, 115 is a storage medium supply device, 16
0 to 163 are storage media, 170 to 173 are bit compression devices, 180 is a transmission processing device, 190 is a program control device, and 191 is a program guide generation device.

The embodiment shown in FIG. 2 shows a case where the software is supplied from the software supply company 10 shown in FIG. In this case, the terminal 100 merely indicates the receiving point of the storage medium to the program distribution center 30. The received storage medium is stored in the storage medium supply device 115, and the storage media 160 to 163 are controlled by the program control device 190.
Supply the storage medium to. The signals reproduced on the storage media 160 to 163 are bit compression devices 170 to 17 respectively.
3 and bit-compressed according to the MPEG-2 standard or the like, and the output signal is input to the transmission processing device 180.

Further, a control signal such as a transmitted program is inputted from the operation center 20 to the program control device 190 via the input means 101. A program transmission control signal from the program control device 190 is input to the storage medium supply device 115, the storage media 160 to 163, and the transmission processing device 140. According to this control signal, as described above, the storage medium in the storage medium supply device 115 is supplied to the storage media 160 to 163, and the software of the storage media 160 to 163 is reproduced.
Stop etc. is controlled.

Also, from the program distribution center 30 to the subscribing household 5
The guide information of the program distributed to
It is generated by the program guide generation device 191 according to the information from 0 and input to the transmission processing device 180. Transmission processing device 1
At 80, for example, signal processing for transmission according to the above-mentioned MPEG transmission standard is performed. The transmission processed signal is transmitted by the transmission device 3
1 is output to the satellite 40 from the transmission device 31.

FIG. 3 is a block diagram showing an example of signal processing in the transmission processing device 180. In FIG. 3, 170
a to 173a, 190a, 191a are input terminals,
170b to 173b and 31a are output terminals and 181 respectively.
184 is an encryption device, 185 is a time division multiplexing device, 1
86 is an error correction code addition device, and 187 is a modulation device.

In FIG. 3, the signals from the bit compression devices 170 to 173 are input to the encryption devices 181 to 184 via the input terminals 170a to 173a, respectively. Encryption device 1
At 81 to 184, each input program is encrypted as necessary. This encryption may be performed on the video signal only, the audio signal only, or both the video signal and the audio signal. The encrypted signal is input to the time division multiplexer 185. The terminal 190a is an input terminal for a signal from the program control device 190, and a viewing right control signal of each program is input to the time division multiplexing device 185. This signal consists of a signal indicating whether each subscriber has the right to view the broadcasted signal. Further, the program guide information from the program guide generator 191 is also input to the time division multiplexer 185. Then, each signal is packetized into a predetermined format, compressed in the time axis direction and multiplexed. In the present embodiment, the viewing right control signal and the program guide information are shown without the encryption device, but these may also be encrypted.

Also, rate control information of each program is input from the terminal 190a. This is because, for example, the program input from the bit compression device 170 is bit-compressed in the range of 4 to 8 Mbps, and the program input from the bit compression device 171 is 2 bits.
It is information such as bit compression in the range of up to 6 Mbps. Based on this information, the time division multiplexer 185 controls the bit rates of the bit compressors 170 to 173. Output terminals 170b to 173b from the time division multiplexer 185.
A control signal is output to the bit compression devices 170 to 173 via. With this, the bit rate of each program is controlled so that the signal rate after time division multiplexing becomes equal to or lower than a certain rate.

The output signal of the time division multiplexer 185 is input to the error correction code adding device 186. Here, for example, an error correction code for correcting a transmission error caused by noise in a satellite line, a CATV line, etc. is added. The output signal of the error correction coding device is input to the modulation device 187,
In the case of the embodiment shown in FIG. 3, the programs of four channels are modulated into a single carrier to form one transmission channel. The signal modulated into the single carrier is output to the transmitting device 31 via the terminal 31a.

In the embodiment shown in FIG. 2, four storage media are provided, and four programs can be input to the transmission processing device 180. However, many storage media are provided and more programs are time-division multiplexed. May be.

In the embodiment shown in FIG. 2, the processing for one transmission channel is shown, but the storage media 160 to 163,
It is also possible to send signals of a plurality of transmission channels by having a plurality of combinations of the bit compression devices 170 to 173 and the transmission processing device 180.

Here, the transmission channel means a signal in which a plurality of programs are time-division multiplexed and modulated with a single carrier as described above, and each of the plurality of programs is simply called a channel.

FIG. 4 shows a specific example of the configuration of the receiver / decoder in the subscribing household 50. In FIG. 4, 200 is an input terminal for a signal from the receiving device 51, 201 is a signal for requesting software to the operation center,
A signal input / output terminal for exchanging signals for knowing the reception status of pay broadcasting, 202 is a restored signal output terminal, 203 is a VTR signal input / output terminal, and 205 is the receiving apparatus shown in FIG. Input terminal of signal from 56, 210 is tuner, 220 is error correction circuit, 230 is program division circuit, 240 is switching circuit, 250 is encryption / decryption circuit, 2
Reference numeral 60 is a decoding circuit for decompressing bits, 270 is a signal output processing circuit, 280 is a control circuit, and 290 is an interface circuit.

Receiving device 5 which receives the signal from the satellite 40
1 inputs a reception signal to the tuner 210 via the terminal 200. The tuner 210 selects the signal of the transmission channel of the desired program from the received signal according to the control signal from the control circuit 280, demodulates the signal modulated by the modulator 187, and outputs the demodulated signal to the error correction circuit 220. The error correction circuit 220 mainly corrects the error generated in the line according to the error correction code added by the error correction code addition device 186. The error-corrected signal is input to the program division circuit 230. The program division circuit 230 selects and outputs a desired program from a plurality of programs time-division multiplexed by the time-division multiplexer 185 on one transmission channel in accordance with a control signal from the control circuit 280.

The output signal of the program division circuit 230 is input to the switching circuit 240 and the interface circuit 290, and further input to the VTR 53 via the output terminal 203. VTR
At 53, the input digital bit stream is recorded, and at the time of reproduction, the interface circuit 290 is input through the input terminal 203 in the same form as the input bit stream.
Entered in. The output signal of the interface circuit 290 is input to the switching circuit 240. Switching circuit 240
In response to the control signal from the control circuit 280, the signal from the program division circuit 230 is selected and output when the received signal is restored, and the interface circuit when the reproduction output signal of the VTR 53 is selected and output. The signal from 290 is selected and output.

The output signal of the switching circuit 240 is input to the encryption / decryption circuit 250. The encryption / decryption circuit 250 decrypts the signals encrypted by the encryption devices 181 to 184. The decrypted signal output from the encryption / decryption circuit 250 is input to the decryption circuit 260 to decrypt and expand the bit compression performed by the bit compression devices 160 to 163 shown in FIG.

The signal decompressed by the decoding circuit 260 is input to the output processing circuit 270 as a component signal composed of a luminance signal and two color difference signals. Output processing circuit 27
At 0, the two input color difference signals are subjected to quadrature two-phase modulation and converted into a carrier color signal, and the obtained carrier color signal and luminance signal are output. The output signal is input to the television receiver 54 via the output terminal 202. Since the television receiver 54 has only a composite input terminal, the output processing circuit 270
May output the composite signal by adding the luminance signal and the carrier color signal. Further, all of the signal including the luminance signal and the carrier color signal and the composite signal may be output.

The signal from the receiving device 56 input from the input terminal 205 is recorded by the VTR 53 as necessary,
When no reproduction signal or recording is performed, an input signal or a signal equivalent to the input is output to the television receiver 54. In the embodiment shown in FIG. 4, the signal before encryption / decryption is VTR53.
Since it is recorded in the VTR 53, it is not always necessary to perform the decryption at the time of recording in the VTR 53, and therefore, the recording process is free at the time of recording, and the charging process can be performed every time it is reproduced.

FIG. 5 shows another embodiment of the receiver decoder shown in FIG. FIG. 5 is partially common to the embodiment shown in FIG. 4, and the common parts are given the same reference numerals and detailed description thereof is omitted.

In the embodiment shown in FIG. 5, the switching circuit 240 is moved after the encryption / decryption circuit 250 as compared with the embodiment shown in FIG. That is, the output signal of the encryption / decryption circuit 250 is VTR5.
3 and the switching circuit 240, and the output signal of the VTR 53 is input to the switching circuit 240. Then, the output signal of the switching circuit 240 is input to the decoding circuit 260.

In the embodiment shown in FIG. 5, the encryption / decryption circuit 25
This is a case of recording a signal which is encrypted and decrypted by 0. In this case, since the encrypted and decrypted signal is recorded in the VTR 53, the billing process for the decryption is performed at the time of recording, and at the time of reproduction, the reproduction can be performed without being charged.

In the embodiment shown in FIG. 5, the encryption / decryption circuit 250 is provided after the program division circuit 230, but the program division processing may be performed after the encryption / decryption is performed first.

FIG. 6 is a block diagram showing an embodiment of the VTR 53. 6, 300 is an input / output terminal of a signal from the receiver decoder 52 shown in FIG. 1, 302 is an input terminal of a signal from the receiver 56 shown in FIG. 1, 303 is an output terminal thereof, 305 is an interface circuit, and 311 is an interface circuit. Parity addition circuit, 312 modulation circuit, 320 tape transport system, 330 demodulation circuit, 331 error correction circuit, 340 analog video signal recording processing circuit, 350 analog video signal reproduction processing circuit, 360 analog audio signal The recording processing circuit 370 is an analog audio signal reproduction processing circuit.

The signal input from the input terminal 300 is supplied to the parity adding circuit 311 via the interface circuit 305.
Entered in. The parity adding circuit 311 adds a parity code for correcting an error generated in the tape transport system 320. The output signal of the parity addition circuit 311 is input to the modulation circuit 312. The modulation circuit 312 modulates the digital signal into a form suitable for the tape transport system 320. Examples of modulation methods are NRZ, NRZI, 8
-10 conversion, MFM, M2 and other methods are known. The modulated signal is input to the tape transport system 320 and recorded on the magnetic tape.

During reproduction, the reproduced signal is the demodulation circuit 3
The signal is input to 30, and demodulation corresponding to the modulation circuit 312 is performed. The output signal of the demodulation circuit 330 is an error correction circuit 331.
The error generated in the tape transport system 320 is corrected on the basis of the parity code input to the parity adder 311 and added to the parity adder 311. The output signal of the error correction circuit 331 is input to the interface circuit 305, and the input terminal 300
After being converted into a signal of the same format as the signal input from, it is output from the terminal 300. The signal output from the terminal 300 is input to the receiver decoder 52 shown in FIG.

As shown in the embodiment of FIG. 6, the bit compression devices 170 to 173 as shown in FIG. 2 are not required inside the VTR 53, and a digital signal recording VTR having a small circuit scale can be realized. Further, since it is not necessary to have a bit compression device inside each VTR, and it is sufficient to have it in the program distribution center 30, a high-performance bit compression device can be used although the circuit scale becomes large and the price increases. Since the bit compression rate can be relatively large, the data rate of the digital signal to be transmitted can be reduced. Therefore, the VTR 53 used by the subscriber is capable of high image quality, low price, and long-time recording.

Further, the analog signal from the receiving device 56 is input from the terminal 302, and is input to the analog video signal recording processing circuit 340 and the analog audio signal recording processing circuit 360. Here, for example, VHS standard, β standard, 8 mm V
Signal processing such as TR standard is performed. The processed signal is input to the tape transport system 320. In the tape transport system 320, signals are recorded according to each format as in the conventional VTR.

At the time of reproduction, the tape transport system 32
The signal reproduced by 0 is the analog video signal reproduction processing circuit 3
50 and an analog audio signal reproduction processing circuit 370, and reproduction signal processing corresponding to the analog video signal recording processing circuit 340 and the analog audio signal recording processing circuit 360 is performed. The reproduced signal is appropriately output terminal 303
Is input to the television receiver 54 shown in FIG. As a result, digital broadcasting and conventional analog broadcasting can be recorded using the same tape transport system.

FIG. 7 shows the embodiment shown in FIG.
Output from the output terminal (or the output terminal 31 shown in FIG. 3).
It is a schematic diagram which shows an example of the output signal of a. The embodiment shown in FIG. 7 shows a case where four programs are transmitted by one transmission channel, in addition to the embodiment shown in FIG. Also, the transmission channels are shown for the case of n transmission channels (1) to (n). In FIG. 7, V1, V2, V3, and V4 are video signals of four programs, A1, A2, A3, and A4 are audio signals of four programs, PG is a signal indicating program guide information, and VECM and AECM are respectively. It is a control signal indicating a viewing right relationship. And each shall represent the signal of one packet.

In the embodiment shown in FIG. 2, the four programs generally have different transmission rates. In addition, when viewed instantaneously, the amount of data increases or decreases.
In order to control this efficiently, each information is packetized and time-division multiplexed as shown in FIG. The details of the signals in the packet are described in the transmission standards mentioned above. Although not shown in detail in the schematic diagram shown in FIG. 7, as described with reference to FIG. 3, the signals in each packet are encrypted by the encryption devices 181 to 184 as necessary, and error correction is performed. The error correction code is added by the code addition device 186,
Header information such as a synchronization signal is added to the time division multiplexer 185.

In the embodiment shown in FIGS. 4 and 5, the terminal 200
7 (1) ... (n) are input, and the tuner 210 selects the signal of one of the transmission channels. Here, it is assumed that FIG. 7A is selected.
The selected signal shown in FIG. 7A is the error correction circuit 220.
Is error-corrected and input to the program division circuit 230. It is assumed that the program shown in Appendix 1 is selected from the four programs which are time-division multiplexed in the program division circuit 230.
At this time, the program guide information PG and the viewing right control signals VECM and AECM are separately output at the same time as the video signal V1 and the audio signal A1. FIG. 8 (2) shows the signal obtained by dividing the program. Figure 8
(1) is a rewrite of FIG. 7 (1).

The switching circuit 2 in the embodiment shown in FIGS.
First, a case where the signal 40 from the tuner 210 is directly selected instead of the reproduced signal from the VTR 53 will be described. Figure 8
The program-divided signal shown in (2) is the decryption circuit 250.
Is encrypted and decrypted. This is performed based on the viewing right control signals VECM and AECM signals shown in FIG. 8 (2). That is, if the subscribing household has the right to view the selected program, the code is decrypted. If the household does not have the right to view, the code is not decrypted, and it is clearly stated that the right to view is not available. The information indicating how to obtain the right is output from the terminal 202. The output of this information is so-called OSD, and the output processing circuit 270 adds this information to the video signal and outputs it.

The encrypted and decrypted signal is input to the decryption circuit 260. The decoding circuit 260 corresponds to the bit compression devices 170 to 1773 shown in FIG. 2, and decodes an input signal according to the MPEG-2 standard, for example. The decoded signal is output from the terminal 202 via the output processing circuit 270.

In the embodiment shown in FIG. 4, the output signal of the program division circuit 230 and in the embodiment shown in FIG. 5 the output signal of the encryption / decryption circuit 250 is input to the VTR 53 via the interface circuit 290 and the terminal 203. . The signal shown in FIG. 8B is input to the interface circuit 290. VTR
At 53, the signal corresponding to FIG. 8 (2) is recorded as shown in the embodiment shown in FIG.

Next, the case where the switching circuit 240 is connected to the reproduction signal from 53 in the embodiment shown in FIGS. 4 and 5 will be described. The signal reproduced by the VTR 53 is reproduced according to the embodiment shown in FIG. 6, and is input to the switching circuit 240 via the terminal 203 and the interface circuit 290. This input signal is substantially the same as the signal input from the other input terminal of the switching circuit 240. Therefore, by inputting the output signal from the switching circuit 240 to the encryption / decryption circuit 250 in the case of the embodiment shown in FIG. 4 and the decryption circuit 260 in the case of the embodiment shown in FIG. 5, the signal received by the tuner 210 can be obtained. VTR53 as when restoring
The signal from can be restored.

Next, a method of limiting the reproduction of the signal recorded by the VTR 53 will be described. Table 1 shows an example of contents described in the program guide information PG shown in FIGS. 7 and 8.

[0053]

[Table 1]

As shown in Table 1, the program guide information PG includes information V PID for identifying a packet of a video signal corresponding to a channel and information A for identifying a packet of an audio signal.
PID, information for identifying viewing right information packet VE P
ID, AE PID, program title, program start time, program finish time, etc. are described. The date and time when the packet of program guide information is received by the subscriber 50 are also described. Since a plurality of programs are multiplexed and sent to one transmission channel as shown in FIG. 2, it is necessary to further select a program of a desired channel from the transmission channels selected by the tuner 210. Therefore, it is necessary to add different identification information to each channel. Further, different identification information PIDs are added to identify the video signal, the audio signal, the program guide information packet, and the viewing right information packet. Therefore, although different identification information PID is added to packets of different channels in the same transmission channel, the same packet identification information PID can exist in packets of channels between different transmission channels.

The program guide packet PG is decoded by the decoding circuit 260 and output to the TV receiver 54 via the output processing circuit 270 and the terminal 202 to select the channel of the program to be watched.

When recording and reproducing one program on the VTR 53, a channel is not selected from the program guide to restore the program recorded for the first time. If only one program is recorded, the program remains as it is. Should be regenerated. For that purpose, the program guide information is not recorded as it is at the time of recording, but is converted into program information according to the information of the program to be recorded and the program information packet is recorded. Figure 8
(3) shows an example of the recording signal in that case. In FIG. 8B, the program information packet PG is, for example, the interface circuit 290.
Then, as shown in Table 2, the recording is limited to the channel information of the program to be recorded. In FIG. 8C, the converted program information packet is represented by MPG.

[0057]

[Table 2]

FIG. 9 is a block diagram of an embodiment showing further details of the encryption / decryption circuit 250 and the decryption circuit 260 shown in FIG. In FIG. 9, 400 is a signal input terminal from the switching circuit 240, 401 is an output terminal, 404 is a control signal input / output terminal with the control circuit 280, 405 is a control signal input terminal from the control circuit 280, and 410 is Selection circuit,
Reference numeral 420 is a program guide information reading circuit, 421 is a program information decoding circuit, 440 is a viewing permission judging circuit, and 450 and 45.
1 is an encryption / decryption circuit, 460 is a video signal expansion circuit, 461
Is an audio signal expansion circuit and 470 is a selection circuit.

First, the case where the signal received by the tuner 210 is input will be described. A signal corresponding to FIG. 8B is input from the terminal 400. Since the program information packet PG has the same packet identification information regardless of the transmission channel, the program guide information packet PG having the information shown in Table 1 is selected by the selection circuit 410 based on this packet identification information. It is input to the information reading circuit 420. The program guide information as shown in Table 1 is input to the program guide decoding circuit 421, the program guide information is decoded and input to the selection circuit 470. A control signal from the control circuit 280 is input from the terminal 404 to the latitude reading circuit 420 and the selection circuit 470. When the program guide information is selected, the signal input from the program guide decoding circuit 421 is selected from the selection circuit 470 and output through the terminal 401, and further, the output processing circuit 27.
0, the program guide can be viewed on the television receiver 54 via terminal 202.

When the user selects which channel to watch the program while viewing the program guide information, the channel information is input from the control circuit 280 to the program guide reading circuit 420 via the terminal 404 and corresponds to the input channel. The packet identification information is read and input to the selection circuit 410. In the selection circuit 410, the video packet V1, the audio packet A1, the viewing right information packet VECM, and the AECM are respectively expanded according to the input packet identification information.
0, audio decompression circuit 461, and viewing permission determination circuit 440.

The viewing permission determination circuit 440 exchanges control signals with the control circuit 280 via the terminal 405. Based on the input viewing right information packets VECM and AECM, it is determined whether the encryption of the packets input to the encryption / decryption circuits 450 and 451 can be decrypted. If the recorded program indicates a pay program, a control signal indicating that the program is a pay program is sent to the control circuit 280 via the terminal 405. The control circuit 280 stores the amount of money corresponding to the program, and inputs the viewing permission control signal to the viewing permission determination circuit 440 via the terminal 405. The viewing permission determination circuit 440 uses the information from the viewing right information packets VECM and AECM as necessary to create information for decrypting the code, and inputs the information to the encryption / decryption circuits 450 and 451. Encryption / decryption circuit 450,
At 451 the encryption of the encrypted video packet V1 and audio packet A1 is decrypted based on the input signal from the viewing permission determination circuit 440. The decrypted video packet V1 and audio packet A1 are input to the video expansion circuit 460 and the audio expansion circuit 461, respectively.

Video decompression circuit 460, audio decompression circuit 461
The bit-compressed video signal and audio signal are decompressed and input to the selection circuit 470. The selection circuit 470 outputs the expanded video signal and audio signal via the terminal 401 in accordance with the control signal input from the terminal 404.

Next, when the signal reproduced by the VTR 53 is input, the signal corresponding to 8 (3) in this case is input from the terminal 400. The converted program guide information packet MPG is the program guide information packet PG before conversion.
Since it has the same packet identification information as the above, it is input from the selection circuit 410 to the program guide reading circuit 420. Terminal 4
When the signal for selecting the program guide information from 04 is input, it is processed in the same manner as when the signal is input from the tuner 210, and is reproduced by the VTR 53 on the television receiver 54 as shown in Table 2. You can see the program information.

When the program guide information is not selected from the terminal 404, the packet identification information of the video packet V1, the audio packet A1, the viewing right information packet VECM, and the AECM of the program being reproduced is selected from the program guide reading circuit 420. The packets are input to the circuit 410, and the respective packets are input to the encryption / decryption circuits 450 and 451 and the viewing permission determination circuit 440. As shown in Table 2, since the converted program guide information packet has only the information of the recorded program, the packet identification information may be input from the program guide reading circuit 420 to the selecting circuit 410 without the need to specify the channel. it can.

Also at the time of reproduction, it is possible to judge whether or not reproduction is possible on the basis of the viewing right information packets VECM and AECM by the viewing permission judgment circuit 440, and to carry out a billing process if necessary. Therefore, the recorded tape cannot be reproduced without limitation, and the rights of the copyright holder and the service provider can be protected.

Next, FIG. 10 shows an embodiment of a decoding circuit corresponding to the embodiment shown in FIG. FIG. 10 is partly common to the embodiment shown in FIG. 9, and common parts are assigned the same reference numerals and detailed explanations thereof are omitted. In FIG. 10, 430 is a time setting circuit, 431 is a comparison circuit, and 441 is a viewing permission determination circuit.

First, the case where the signal received by the tuner 210 is input will be described. A signal corresponding to FIG. 8B is input from the terminal 400. Since the program information packet PG has the same packet identification information regardless of the transmission channel, the program guide information packet PG having the information shown in Table 1 is selected by the selection circuit 410 based on this packet identification information. It is input to the information reading circuit 420. The date and time information when the program information packet PG is received from the program information reading circuit 420 is input to the time setting circuit 430. The time setting circuit 430 sets the current time based on the input date and time information.
Further, the program guide information as shown in Table 1 is input to the program guide decoding circuit 421, the program guide information is decoded and input to the selection circuit 470. When the control signal is input from the control circuit 280 via the terminal 404 and the program guide information is selected, the selection circuit 470 outputs the decoded program guide information.

Similar to the embodiment shown in FIG. 9, when a control signal for selecting a desired channel is input from the terminal 404, the packet identification information is input from the program guide reading circuit 420 to the selection circuit 410 and the selection circuit. The video packet and the audio packet are input to the video expansion circuit 460 and the audio expansion circuit 461, respectively. The bit-compressed signals are decompressed, input to the selection circuit 470, and output from the terminal 400 according to the control signal input from the terminal 404.

When the reproduction signal is input from the VTR 53, the converted program guide information packet MPG as shown in Table 2 is input to the program guide information reading circuit 420 as in the embodiment shown in FIG. From inside, date and time information is input to the comparison circuit 431. The date and time information input at this time is the information when recorded on the VTR 53. On the other hand, the current date and time are input from the time setting circuit 430 to the comparison circuit 431. Where the current date and time
The date and time when recorded on the VTR 53 are compared. Also,
The viewing right information packets VECM and AECM of the reproduced program are selected and input from the selection circuit 410 to the viewing permission judging circuit 441, and it is judged whether the program has a reproduction restriction or a program without reproduction restriction, and the judgment result Is input to the comparison circuit 431. The comparison circuit 431 does not output a control signal for limiting the expansion to the video expansion circuit 460 and the audio expansion circuit 461 in the case of a program having no reproduction restriction. In the case of a program with reproduction restrictions, the condition is input to the comparison circuit 431. The reproduction restriction condition is, for example, only on the recording day, 3 after recording.
The reproduction is permitted by deciding a deadline such that it can be viewed for one day or one week. According to this condition, the comparison circuit 43
Whether or not the reproduction is possible is determined by taking the difference between the current date and time and the recorded date and time compared in 1. According to the availability of this playback,
If reproduction is not possible, a signal for limiting expansion is input to the video expansion circuit 460 and the audio expansion circuit 461. This allows
The recorded tape can no longer be played back indefinitely, and the rights of the copyright holder and service provider can be protected.

According to the present invention, for example, even if a recorded tape is duplicated, only a tape under the same conditions can be produced. Therefore, even if a copyrighted person or a service provider makes a duplicate of the tape without permission, the limited viewing is possible. Only you can do it, and you can not make so-called pirated tapes.

Further, since the present time is set according to the received signal, the present time does not shift and the present time cannot be artificially shifted. Further, for the same reason, the elapsed time after recording can be accurately and shown, and further, it cannot be artificially changed, so that the above right can be surely protected.

[0072]

According to the present invention, the input digital information can be efficiently recorded, and the reproduction restriction can be performed easily and surely.

[Brief description of drawings]

FIG. 1 is a block diagram showing a digital broadcasting and analog broadcasting system according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a program distribution center according to the present invention.

FIG. 3 is a block diagram showing an embodiment of a transmission processing device according to the present invention.

FIG. 4 is a block diagram showing an embodiment of a receiver decoder according to the present invention.

FIG. 5 is a block diagram showing an embodiment of a receiver decoder according to the present invention.

FIG. 6 is a block diagram showing an embodiment of a VTR according to the present invention.

FIG. 7 is a waveform diagram of signals in the present invention.

FIG. 8 is a waveform diagram of signals in the present invention.

FIG. 9 is a block diagram showing an embodiment of the present invention.

FIG. 10 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

52 ... Receiver decoder 53 ... VTR 171 to 173 ... Bit compression device 180 ... Transmission processing device 181 to 184 ... Encryption device 185 ... Time Division Multiplexer 186 ... Error correction code addition device 187 ... Modulator 220, 331 ... Error correction circuit 230 ... Program division circuit 250 ... Encryption / decryption circuit 260 ... Decoding circuit 311 ... Parity addition circuit 410, 470 ... Selection circuit 420 ... Program guide reading circuit 430 ... Time setting circuit 431 ... Comparison circuit 440, 441 ... Viewing permission determination circuit

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 22, 2002 (2002.5.2)
2)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for receiving, recording and reproducing digital information signals such as movies and programs transmitted by transmission means such as coaxial cables, optical cables, telephone lines, and satellite broadcasting. , Especially Dizzy
The present invention relates to a device for efficiently recording and reproducing a digital information signal .

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Delete

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Delete

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

2. Description of the Related Art As a method for highly efficiently digitally compressing a video signal, for example, MPEG-2 (Moving Picture Experts G
ITU-T Draft Rec. H.262 standard called roup) is known. As a transmission standard for video signals and audio signals compressed by MPEG-2, the MPEG-2 Systems Working Dra
ft is known.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Although it is desired to digitally record the digitally broadcasted signal as it is, the above-mentioned MPEG, for example, is used.
There is still no disclosure of a technique for recording a digital signal which is compressed by a standard and transmitted. Usually, when recording / reproducing a digital signal, since error correction is sufficiently performed, there is an advantage that the same tape can be repeatedly viewed without deterioration in image quality. Also, one program
If you want to watch
The program is restored only after selecting it, but one program is recorded
If you want to play, select a channel from the program guide.
First time, instead of restoring the recorded program,
If only the set is recorded, the program will be played as it is
It should be.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Delete

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

The object of the present invention is to compress, for example, the MPEG standard,
It is to provide a method and apparatus capable of efficiently record to Rukoto the transmitted signal.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

In order to solve the above problems, the following means were used. That is, packet of video signal, sound
Voice signal packets and program information packets are multiplexed.
Input a digital signal containing multiple programs
And a tuner for demodulating the input digital signal.
And a digital signal demodulated by the tuner means.
From the video signal of the specified program,
The packet of the audio signal of the specified program and the packet of the program information.
Extraction means for extracting a ket and extraction by the extraction means
The audio and video signals contained in the captured packets
Decrypting means for performing the program information extracted by the extracting means.
Rewrite information packet with information about specified program
Packet and the video signal extracted by the extraction means
And a packet of an audio signal, and an output unit for outputting the packet .

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

[Operation] Is the information received when recording the selected program?
Create new information from the
Record program information packets by converting to program information
it can.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0063

[Correction method] Change

[Correction content]

Next, it is a case where the signal reproduced by the VTR 53 is inputted . In this case, the signal corresponding to FIG. 8 (3) is inputted from the terminal 400. The converted program guide information packet MPG is the program guide information packet PG before conversion.
Since it has the same packet identification information as the above, it is input from the selection circuit 410 to the program guide reading circuit 420. Terminal 4
When the signal for selecting the program guide information from 04 is input, it is processed in the same manner as when the signal is input from the tuner 210, and is reproduced by the VTR 53 on the television receiver 54 as shown in Table 2. You can see the program information.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0064

[Correction method] Change

[Correction content]

When the program guide information is not selected from the terminal 404, the packet identification information of the video packet V1, the audio packet A1, the viewing right information packet VECM, and the AECM of the program being reproduced is selected from the program guide reading circuit 420. The packets are input to the circuit 410, and the respective packets are input to the encryption / decryption circuits 450 and 451 and the viewing permission determination circuit 440. As shown in Table 2, since the converted program guide information packet has only the information of the recorded program, it is possible to input the packet identification information from the program guide reading circuit 420 to the selection circuit 410 without specifying the channel. <br/> Yes.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Name of item to be corrected] 0072

[Correction method] Change

[Correction content]

[0072]

According to the present invention, Ru can be efficiently recording digital information inputted.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kyoichi Hosokawa             1410 Inada, Hitachinaka City, Ibaraki Prefecture             Hitachi, Ltd. Personal Media Equipment Division (72) Inventor Keiji Noguchi             1410 Inada, Hitachinaka City, Ibaraki Prefecture             Hitachi, Ltd. Personal Media Equipment Division F-term (reference) 5C053 FA20 FA22 GB37 JA30 LA06                       LA07 LA14                 5C063 AB07 AB11 DA13 EB33                 5C064 BA01 BB01 BB02 BC23 BC25                       BD02 BD08 BD09 CA14 CC04

Claims (4)

[Claims] 1. A bit-compressed program of a plurality of channels and guide information of the plurality of programs are transmitted, the transmitted plurality of programs and guide information of the plurality of programs are received, and the received information is received. In a system for selecting one program from a plurality of programs, recording and reproducing the selected program with a recording / reproducing device, decompressing and reproducing the reproduced program, The guide information of the selected program is selected from the guide information of the program to create new guide information, and the selected program and the new guide information are simultaneously output to the recording / reproducing apparatus. A method of receiving a digital signal, characterized in that the reproduced program is bit-decompressed and restored on the basis of new guide information reproduced from. 2. A plurality of programs according to claim 1, wherein at least two programs and guide information of the plurality of programs are packetized, time-division multiplexed and transmitted, and the guide information includes at least identification information of each packet. Receiving a digital signal characterized by reading packet identification information from the reproduced new guide information, selecting the packet of the reproduced program based on the read packet information, and decompressing the packet. Method. 3. The guide information of the plurality of programs according to claim 1 includes information on the date and time when the guide information of the plurality of programs is received, and the information on the date and time included in the guide information of the plurality of received programs is set. The current time is set using the new guide information including the date and time information included in the guide information of the plurality of received programs, the date and time information included in the reproduced new guide information, and the current time. A method of receiving a digital signal, comprising comparing times, and inhibiting bit expansion of the reproduced program when the comparison result exceeds a predetermined period. 4. Transmission of bit-compressed programs of a plurality of channels and guide information of a plurality of programs, which is guide information of the plurality of programs and includes at least information of date and time when the information is received, Receiving a plurality of transmitted programs and guide information of the plurality of programs, selecting one program from the plurality of received programs, recording and reproducing the selected program with a recording / reproducing device, In a system in which a reproduced program is bit-decompressed, restored, and viewed, guide information of the selected program and information of the date and time are selected from the received guide information of the plurality of programs to create new guide information. Means, means for outputting the selected program and the new guide information to the recording / reproducing apparatus at the same time, and the current time using the date and time information included in the guide information of the plurality of received programs. Means for setting the time, means for comparing the current time with the date and time information included in the reproduced new guide information, and the bit of the reproduced program when the comparison result exceeds a predetermined period. An apparatus for receiving a digital signal, comprising: means for inhibiting expansion.