JP3561599B2 - Digital signal receiver - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital signal receiver, and more particularly, to a digital signal receiver that receives digital satellite broadcasts and outputs corresponding image and sound signals.
[0002]
[Prior art]
2. Description of the Related Art Digital satellite broadcasting has been put to practical use, and the number of channels is larger than any conventional broadcasting such as terrestrial broadcasting, analog satellite broadcasting, and cable television broadcasting.
[0003]
Such multi-channel broadcasting is realized by a combination of MPEG2 (Moving Picture Experts Group phase2), which is an international standard for moving picture compression technology (high-efficiency coding scheme), and a digital transmission scheme.
[0004]
When one transponder of 27 MHz, for example, mounted on satellite broadcasting is used, only one channel of television broadcasting can be provided by the conventional analog system. In digital broadcasting, for example, if the encoding speed of video for one channel is 6 Mbit / sec, broadcasting for four channels is possible.
[0005]
Here, when pay broadcasting is performed, a scrambling process for transmission data and a conditional access system for performing a descrambling process on the receiver side are essential.
[0006]
FIG. 10 is a diagram for describing an outline of an example of such an image broadcasting system using satellite broadcasting.
[0007]
Various programs from program suppliers are compressed and digitized by an MPEG encoder and converted to a packet stream of MPEG2 transport packets in units of 188 bytes. Since these program data are basically pay broadcasts, image and audio packets are encrypted (scrambled) for each packet. The key for descrambling is transmitted as related information as one of the packets together with the video / audio signal.
[0008]
However, as will be described later, the transmitted key itself is also encrypted so that the scramble is not illegally released, and the individual key for decrypting the key is inserted into each receiver. Each is stored secretly in the IC card. For example, for a broadcast from a specific program supplier, which of the broadcast programs can be descrambled can be selected from the transmitting side based on the contract information of each receiver. Has become.
[0009]
Usually, a viewer contract is made for each channel, and programs on the contracted channel are always viewable, but there is also a contract form called pay-per-view (hereinafter, PPV). That is, for example, this is a contract form in which only a certain movie program of two hours can be viewed for a fee each time. By operating the remote control of the receiver, the PPV program can be viewed. For example, at the end of the month, information on the PPV program watched in the month is automatically transmitted to the customer management system and charged.
[0010]
[Problems to be solved by the invention]
FIG. 11 is a schematic block diagram showing a configuration of a conventional digital signal receiving apparatus 2000 for receiving digital satellite broadcasting.
[0011]
The digital signal receiving apparatus 2000 receives a satellite wave received by the antenna 100, switches a receiving transponder, demodulates and decodes a received signal, corrects an error, and outputs an MPEG2 transport stream. Upon receiving the stream, the descrambling LSI 104 performs descrambling processing using the descrambling key data Ks supplied from the IC card 124, and receives data transferred from the descrambling LSI 104, and performs a channel selection operation by the viewer. A transport stream that receives a PSI (program specification information) based on the data stream, extracts packets corresponding to necessary video data and audio data from the transport stream, and outputs the packets to the corresponding decoding LSIs 108 and 118, respectively. place And a LSI106.
[0012]
The digital signal receiving apparatus 2000 further receives an output from the transport / stream processing LSI 106 and receives an MPEG2 video decoding LSI 108 for converting the output into video data before compression processing, and a decoded signal from the MPEG2 video decoding LSI 108. , An NTSC conversion LSI 110 for converting the signal into an NTSC signal (composite signal) and outputting the converted signal. Here, for example, a terminal for outputting a component signal (a signal obtained by separating a luminance (Y) signal and a color signal (C)) is also provided.
[0013]
The digital signal receiving apparatus 2000 further receives an output from the transport / stream processing LSI 106, converts the output into audio data before data compression and outputs the audio data, and a decoding from the MPEG1 audio decoding LSI 118. A DA conversion LSI 120 for receiving the signal, DA converting the signal, and outputting the signal.
[0014]
Signals from the NTSC conversion LSI 110 and the DA conversion LSI 120 are input to a display device (for example, a television receiver) 126, and corresponding images and sounds are output.
[0015]
The IC card 124 performs charging / communication related control such as descrambling of the scramble key Ks transmitted in an encrypted state, primary storage of the PPV viewing record, and instructing the receiver to call the modem.
[0016]
Key data (work key Kw and master key Km) necessary for decrypting the scramble key Ks is separated by the transport stream processing LSI 106 and transferred to the IC card 124.
[0017]
The control CPU 112 controls all the above processes. The control CPU 112 receives program table (EPG: Electric Program Guide) data, stores the data in the memory 114, and performs various functions such as software processing for realizing output of the program table to the display device 126, IC processing, and the like. It also performs processing on the card, communication processing related to the modem, and the like.
[0018]
The instruction from the viewer is performed by receiving a signal emitted from the remote controller 122 by the user interface circuit 116 and giving the signal to the control CPU 112.
[0019]
FIG. 12 is a schematic diagram showing a configuration of a system for performing scrambling processing performed on the transmission side and a conditional access system for performing descrambling on the reception side.
[0020]
The scrambling process and the descrambling process are performed using three types of keys based on a common key cryptosystem.
[0021]
On the transmission side, a scramble key Ks is used to scramble transmission data such as video. The scramble key Ks is encrypted by using the work key Kw, multiplexed with a satellite wave, and delivered. The work key Kw is also encrypted by using the master key Km, multiplexed with a satellite wave, and delivered.
[0022]
On the receiving side, the work key Kw separated from the satellite wave is decrypted by the master key Km in the IC card. The scramble key Ks separated from the satellite wave is decrypted by the decrypted work key Kw and output from the IC card. Using this key Ks, a descrambling process for a video signal or the like is performed.
[0023]
FIG. 13 is a flowchart for explaining the operation of digital signal receiving apparatus 2000 in a state in which a broadcast from a single program supplier is being received, that is, in a state in which a broadcast from a single network is being received. It is.
[0024]
First, when the main power supply is in the ON state (step S100), the control CPU 112 determines whether or not the initialization of the device, for example, the initialization of the IC card has been completed (step S102). If has not been completed, an initialization process is performed (step S104).
[0025]
On the other hand, when the initialization processing is completed, the control CPU 112 performs processing in a standby state, that is, processing such as acquisition of time data, acquisition of data of a reserved program, acquisition of mail, and transfer of viewing / recording (step S1). S106).
[0026]
Subsequently, an uplink to the network is determined (step S108). If the uplink is present, the viewing record is transferred (step S110), and the process returns to step S106 (step S124).
[0027]
If there is no uplink instruction, the control CPU 112 determines whether or not the power is on (step S112).
[0028]
If the power is not on, the control CPU 112 determines whether it is the start time of the reserved program (step S114). If not, the process returns to step S106 (step S124). Then, an execution process of the reserved program is performed (step S116).
[0029]
Subsequently, based on an instruction from the viewer, the control CPU 112 selectively performs processing such as presentation of a selected program (step 118), presentation of a program guide (step S120), and menu display (S122).
[0030]
After the above processing, the control CPU 112 determines whether or not there is an instruction to turn off the power (step S122). If there is no instruction, the processing returns to step S106. Execute (step S124), and the process returns to step S106.
[0031]
The conventional digital signal receiving apparatus 2000 performs the above configuration and operation, and thus has the following problems.
[0032]
Here, in order to receive digital broadcasting from a plurality of satellites (networks), it is necessary to have an antenna for receiving radio waves from a plurality of satellites and switch the receiving network. Therefore, it is generally not possible for one receiver to simultaneously receive images of a plurality of networks. In the case of simultaneous reception, a plurality of tuners, a transport stream processing LSI, an MPEG decoding LSI, and the like are required, which is impractical due to the system configuration and cost.
[0033]
That is, in order for one receiver to receive a plurality of satellites or a plurality of networks in the same satellite, it is necessary to switch between networks and an IC card corresponding to the network.
[0034]
If the digital broadcast receiver is configured to selectively receive data only from a single network, the digital broadcast receiver can receive data such as mails, program guides, and uplink instructions even when the power is off (main power is on) and no video is received. Therefore, if only information from one network is received in the standby state, program guides for multiple networks can be displayed at the same time, or while viewing images of one network, etc. It is impossible to see the program guide display of the other network.
[0035]
The present invention has been made to solve the above problems, and an object of the present invention is to obtain various information from each network in a standby state even when receiving broadcasts from a plurality of networks. It is to provide a digital signal receiving device capable of performing the following.
[0036]
[Means for Solving the Problems]
2. The digital signal receiving apparatus according to claim 1, wherein a plurality of scrambled program data and attribute data corresponding to a scrambling method of a network to which each of the program data belongs are simultaneously transmitted as a packet stream in a communication system. A device,
Control means for controlling the operation of the digital signal receiving apparatus, and a plurality of storage means for holding key data for descrambling different according to the attribute data of the program data, and for outputting data driven externally A plurality of storage means can be mounted at the same time, an information reading means for selecting a storage means corresponding to program data being received, and key data corresponding to program data received from the information reading means, Means for descrambling the received program data, wherein the storage means requires predetermined initialization processing at power-on, the control means includes a memory means for holding data, and the information reading means When the main power supply of the apparatus is in the ON state, power is supplied to all storage means to maintain the initialized state, and a standby state in which no program is received. In state, it acquires predetermined update data from each of the network at predetermined time intervals, and storing, in said memory means.
[0037]
3. The digital signal receiving apparatus according to claim 2, wherein each of the plurality of program data is divided into a plurality of packets, scrambled and transmitted, and attribute data corresponding to a scrambling method of a network to which each of the program data belongs is simultaneously transmitted. A digital signal receiving apparatus in a communication system, wherein the control means controls the operation of the digital signal receiving apparatus according to an external control signal, and a carrier for transmitting a signal including the program data and the attribute data. Receiving and demodulating means, a plurality of storage means for holding key data for descrambling processing different according to the attribute data of the program data, and driving data from the outside to output data, and a plurality of storage means Can be attached at the same time, the information reading means for selecting a storage means corresponding to the program data being received, Means for receiving the output from the keying means and descrambling the received program data in accordance with the key data corresponding to the received program data from the information reading means; and Decoding means for extracting an image sound signal from a signal, wherein the storage means requires a predetermined initialization process when power is turned on, the control means includes a memory means for holding data, and the information reading means When the main power supply of the apparatus is in the ON state, power is supplied to all the storage means to maintain the initialized state, and in the standby state in which no program is received, each of the above described means is provided at predetermined time intervals. It is characterized in that predetermined update data is obtained from a network and stored in the memory means.
[0038]
4. The digital signal receiving apparatus according to claim 3, wherein the storage unit is an IC card, and the information reading unit is controlled by a power supply potential supply unit that supplies a power supply potential to each of the IC cards; Clock signal supply means for supplying a clock signal to a corresponding IC card.
[0039]
5. The digital signal receiving device according to claim 4, wherein the predetermined update data is program guide data, and the control unit is configured to, among the program guide data corresponding to the plurality of networks, according to an external instruction. It outputs program guide data corresponding to an arbitrary number of networks.
[0040]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic block diagram showing a configuration of a digital signal receiving device 1000 according to an embodiment of the present invention, and is a diagram compared with FIG.
[0041]
The difference from the configuration of the conventional digital signal receiving apparatus 2000 of FIG. 11 is that an IC card slot 130 capable of simultaneously receiving a plurality of IC cards is provided. The other points are basically the same as the configuration of digital signal receiving apparatus 2000, and the same portions are denoted by the same reference characters and description thereof will not be repeated.
[0042]
That is, the digital signal receiving apparatus 1000 can simultaneously receive data from a plurality of IC cards and can descramble satellite waves from a plurality of networks. , A tuner module 102, a descrambling LSI 104, a transport stream processing LSI 106, an MPEG2 video decoding LSI 108, an MPEG1 audio decoding LSI 118, and the like.
[0043]
FIG. 2 is a conceptual diagram showing a configuration of a packet stream of digital satellite broadcasting. The packet stream includes time-division multiplexed video data, audio data, and additional information added to a program.
[0044]
The video and audio data and the additional information are each divided into small pieces (188 bytes) of a fixed size called TS packets (Transport Stream Packets), and they are mixed in a time-division manner, that is, multiplexed and broadcast. You.
[0045]
Each TS packet is assigned a number called a PID (Packet ID) for identifying the TS packet.
[0046]
The same PID is assigned to the same type of data. In FIG. 2, first, there are video data with PIDs v1 and v2, and audio data with o1 and o2. Further, video data having a PID of v5 and audio data having an o5 follow the PID.
[0047]
The additional information data includes, for example, the following three types of data. That is, first, data indicating PID information of a PMT, which will be described later, called PAT (Program Association Table), information data of a currently broadcast channel called PMT (Program Map Table), and EIT (Event Information Table) And information of a program scheduled to be broadcast.
[0048]
PIDs are also assigned to PAT, PMT, and EIT. The PID of PAT is 0000 in hexadecimal notation, and the PID of EIT is hex in hexadecimal 0012. The PID of the PMT is described in the PAT.
[0049]
The receiver first receives the PAT, searches for the PMT corresponding to the channel selected by the viewer, and obtains the channel information.
[0050]
Further, the receiver displays the program guide on the TV screen using the information of the EIT and makes a recording reservation.
[0051]
When a program is reserved for recording, the PMT is continuously observed, and when a designated program code comes, processing for the reserved program such as output or recording of the program is executed. Thereafter, when the program code number changes, the processing is terminated. I do.
[0052]
FIG. 3 is a conceptual diagram showing the configuration of the PAT. As shown in FIG. 3, the PAT is a table in which the PID of the PMT in which information of each channel currently being broadcast is recorded.
[0053]
That is, the PAT includes the channel number and the PID of the PMT as a pair and includes the number of channels.
[0054]
The receiver first receives the PAT, finds the PMT corresponding to the selected channel, and obtains channel information. For example, when the channel n is selected, the PMT whose PID is pn is acquired. The PAT is repeatedly transmitted at a time interval of 0.1 second or less.
[0055]
FIG. 4 is a conceptual diagram showing the configuration of the PMT. As shown in FIG. 4, the PMT is a table in which information of each channel currently being broadcast is recorded.
[0056]
That is, the PMT includes, in the area designated by the PID, the channel number, encryption information, copy permission information, the program code currently being broadcast, the PID number of the video data, the PID number of the audio data, and the like by the number of channels. ing.
[0057]
The receiver observes the program code reserved for the program, and starts a corresponding process when the specified program code is received. The PAT is repeatedly transmitted at a time interval of 0.1 second or less.
[0058]
FIG. 5 is a conceptual diagram showing the configuration of the EIT. As shown in FIG. 5, EIT is a table in which program information to be broadcast is recorded.
[0059]
That is, the EIT includes a channel number, a broadcast date, and the like in an area designated by the PID, and subsequently, a program number, a start time, a program name, program description information, a program code, and the like corresponding to each program. Only as many programs are included.
[0060]
For example, when the program with the program code c1 is reserved for the program, the receiver observes the PMT, and when the specified program code is received, starts the corresponding processing. The PAT is repeatedly transmitted at a time interval of about one second.
[0061]
When receiving with one tuner, taking a certain point in time, one of the first and second IC cards 1302 and 1310 corresponding to the receiving program provider operates.
[0062]
That is, it is possible to respond to reception from a plurality of networks by switching one serial channel as needed.
[0063]
FIG. 6 is a flowchart for explaining the operation of digital signal receiving apparatus 1000 in a state in which broadcasts from two program suppliers are being received, that is, in a state in which broadcasts from two networks are being received. .
[0064]
First, when the main power supply is in the ON state (step S200), the control CPU 112 determines whether or not the initialization of the device, for example, the initialization of the IC card or the like has been completed (step S202). If has not been completed, an initialization process is performed (step S204).
[0065]
On the other hand, if the initialization processing has been completed, the control CPU 112 shifts the state of the device to the standby state (step S206). Subsequently, processing in the standby state, that is, processing such as acquisition of time data with respect to the network A, acquisition of data of a reserved program, acquisition of mail, and viewing / recording transfer is performed (step S208).
[0066]
Subsequently, an uplink to the network A is determined (step S210). If there is an uplink, the viewing record is transferred, and the process returns to step S206 (step S212).
[0067]
When there is no uplink to the network A, the control CPU 112 subsequently performs processing in a standby state, that is, processing such as acquisition of time data for the network B, acquisition of data of a reserved program, acquisition of mail, and transfer of viewing recording. Is performed (step S214).
[0068]
After the end of the above process, the control CPU 112 determines an uplink to the network B (step S216), transfers the viewing record if the uplink is established, and returns the process to step S206 (step S218). ).
[0069]
Subsequently, it is determined whether the power is on (step S220).
If the power is not on, the control CPU 112 determines whether it is the start time of the reserved program (step S222). If not, the process returns to step S206 (step 222). Then, execution processing of the reserved program is performed (step S224).
[0070]
Subsequently, based on an instruction from the viewer, the control CPU 112 selectively performs processing such as presentation of a selected program (step 226), presentation of a program guide (step S228), and menu display (S230).
[0071]
After the above processing, the control CPU 112 determines whether or not there is an instruction to turn off the power (step S232). If there is no instruction, the process returns to step S206. The process is executed (step S234), and the process returns to step S206.
[0072]
In the present invention, as described above, data can be obtained from two or more networks in the standby state. Moreover, it is not necessary to perform a reset sequence of the IC card every time the network is switched.
[0073]
In the standby state, data acquisition from a plurality of networks, i.e., determination of presence / absence of mail of each network, determination of a change in time and a reserved program, determination of a viewing history transfer instruction, determination of current broadcast program data ( By performing acquisition of the program guide data), it is possible to perform processing as described below.
[0074]
FIG. 7 is a diagram illustrating an example of a display screen of a program guide for a single network. The number of the channel currently being received, the broadcast time of the program being broadcast, whether it is paid or free, the name of the program, etc. are displayed from the top, and the bottom is the program broadcast schedule for each channel broadcast on the network. Is displayed.
[0075]
If only such a program guide display for a single network is used, it can be displayed even with a conventional digital signal receiving device.
[0076]
FIG. 8 is a diagram showing a display example in which program guides for two networks are displayed in parallel.
[0077]
Since digital signal receiving apparatus 1000 of the present embodiment has acquired program guide data of both network A and network B during the standby period, the other program guide is displayed in addition to the program guide of the receiving network when the power is turned on. It is possible to do.
[0078]
FIG. 9 is a diagram showing a display example in which the image of the network B being received is output on one half of the screen and the program guide of the other network A is displayed on the other half of the screen.
[0079]
Since the program guide for the network B other than the network A to be received is acquired during the standby period, such display can be performed.
[0080]
In addition, by acquiring data for each network during standby, it is possible to reserve programs for each network, including networks other than the one being tuned, to acquire mail on each network, and to view An effect is also obtained that it is possible to reduce the history transfer failure.
[0081]
In the above description, the case where reception is performed for two networks has been described. However, the present invention is not limited to such a case, and it is possible to receive more networks by changing the configuration of the IC card slot 130. Is also possible.
[0082]
【The invention's effect】
As described above, according to the present invention, when receiving scrambled program data from a plurality of networks, the receiving device acquires and holds additional information from each network in a standby state, so that a plurality of You can receive mail from the network and uplink. Furthermore, a program guide other than the currently receiving network is displayed simultaneously with a program guide for the currently receiving network, or the other program guide is displayed while displaying a video of a program of the currently receiving network. Becomes possible. Also, program reservation for a plurality of networks becomes possible.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram illustrating a configuration of a digital signal receiving device 1000 according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating a configuration of a packet stream of digital satellite broadcasting.
FIG. 3 is a schematic diagram illustrating a configuration of a PAT.
FIG. 4 is a schematic diagram showing a configuration of a PMT.
FIG. 5 is a schematic diagram showing a configuration of an EIT.
FIG. 6 is a flowchart showing an operation of the digital signal receiving device 1000.
FIG. 7 is a diagram showing a display example of a program guide.
FIG. 8 is a diagram illustrating a display example in which program guides of two networks are simultaneously displayed.
FIG. 9 is a schematic diagram showing a display example in which an image being received and a program guide of a non-receiving network are simultaneously displayed.
FIG. 10 is a conceptual diagram showing a configuration of a digital satellite broadcasting system.
FIG. 11 is a schematic block diagram showing a configuration of a conventional digital signal receiving device 2000.
FIG. 12 is a schematic diagram showing a configuration of a system for performing scrambling and a system for performing descrambling.
FIG. 13 is a flowchart illustrating an operation of the conventional digital signal receiving apparatus 2000.
[Explanation of symbols]
100 antenna
102 Tuner module
104 Descramble LSI
106 Transport Stream Processing LSI
108 MPEG2 Video Decoding LSI
110 NTSC conversion LSI
112 Control CPU
114 memory
116 User interface circuit
118 MPEG1 audio decoding LSI
120 DA conversion LSI
122 remote control
124 IC card
126 display device
1000, 2000 digital signal receiver

Claims (4)

A plurality of program data is scrambled, the attribute data corresponding to the scrambling method for each program data belong network is a digital signal receiving apparatus in a communication system is transmitted as a packet stream simultaneously,
Control means for controlling the operation of the digital signal receiving device,
A plurality of storage means for holding key data for different descrambling processing according to the attribute data of the program data, and for outputting data driven externally ;
The a plurality of attachable storage means simultaneously, an information reading means for selecting the storage means corresponding to the program data being received,
Means for descrambling the received program data according to the key data corresponding to the received program data from the information reading means ,
The storage means requires a predetermined initialization process at power-on,
The control means,
Including memory means for holding data,
By controlling the information reading means, when the main power supply of the apparatus is in the ON state, power is supplied to all the storage means to maintain the initialized state, and in the standby state in which no program is received , for a predetermined time. acquires predetermined update data from the previous SL each network at intervals, the digital signal receiving apparatus characterized by storing in said memory means. Each of the plurality of program data is divided into a plurality of packets, and is transmitted in a scrambled, there in the digital signal receiving apparatus in a communication system attribute data corresponding to the scrambling method for each program data belong network are transmitted simultaneously hand,
Control means for controlling the operation of the digital signal receiving device according to a control signal from the outside,
Means for receiving a carrier wave transmitting a signal including the program data and the attribute data, and demodulating the carrier wave;
A plurality of storage means for holding key data for different descrambling processing according to the attribute data of the program data, and for outputting data driven externally ;
The a plurality of attachable storage means simultaneously, an information reading means for selecting the storage means corresponding to the program data being received,
Means for receiving an output from the demodulation means and descrambling the received program data according to key data corresponding to the received program data from the information reading means ;
Decoding means which is controlled by the control means and extracts an image sound signal from the descrambled signal,
The storage means requires a predetermined initialization process at power-on,
The control means,
Including memory means for holding data,
By controlling the information reading means, when the main power supply of the apparatus is in the ON state, power is supplied to all the storage means to maintain the initialized state, and in the standby state in which no program is received , for a predetermined time. acquires predetermined update data from the previous SL each network at intervals, the digital signal receiving apparatus characterized by storing in said memory means. The storage unit, Ri Oh in the IC card,
A power supply potential supply unit configured to supply a power supply potential to each of the IC cards;
3. The digital signal receiving device according to claim 2 , further comprising a clock signal supply unit controlled by said control unit and supplying a clock signal to a corresponding IC card . The predetermined update data is program guide data,
4. The digital signal receiving apparatus according to claim 3, wherein the control unit outputs program guide data corresponding to an arbitrary number of networks among the program guide data corresponding to the plurality of networks in response to an instruction from the outside. .

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