JPH0730537A - Security device of receiver in data broadcast - Google Patents

Abstract

PURPOSE:To obtain the security equipment able to convert various bit streams into a normal signal by having only to replace an IC card without addition of a basic device. CONSTITUTION:The device is provided with an antenna 1 and a tuner 2 receiving a radio wave of plural data broadcasts, and a signal decoding section 3 comprising a scramble release device 4 releasing it from a bit stream when the bit stream outputted from the tuner 2 is scrambled and comprising a decoder 5 decoding the coded signal. The device is also provided with two storage devices storing data used for the signal decoding section 3, the one device is a stationary storage device and the other storage device is a portable IC card 9 and a reader 8, data for scramble release and data decoding in common to plural data broadcasts are stored in the stationary storage device 7 and specific data are written on the IC card 9 for each data broadcast.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security device that prevents unsubscribers from using media without permission in pay broadcasting in data broadcasting.

[0002]

2. Description of the Related Art In wireless broadcasting such as terrestrial broadcasting and satellite broadcasting, although broadcastability is excellent, if importance is placed on this broadcastability, any receiving device must be able to receive radio waves. However, there is a contradiction that the reception fee cannot be reliably collected. Therefore, especially in satellite broadcasting, at present, considering the balance between broadcast property and fee collection, a configuration that can receive radio waves as long as a tuner is provided and the broadcast property is set backward, scrambling the bit stream, There is a coexistence with a configuration in which a normal signal cannot be obtained by descrambling without a decoder.

[0003]

By the way, in the case of receiving a satellite broadcast, the receiving side first needs an antenna, then a tuner capable of catching the transmission frequency, and the radio waves are scrambled. It must be equipped with a plurality of devices such as a descrambler when it is a digital signal and a decoder when it is a digital signal. Moreover, if the scrambling method is different depending on the broadcasting station and the communication algorithm is different, it is necessary to add a descrambler and a decoder in order to capture a plurality of radio waves, and the device wiring is complicated. As soon as
This is often annoying to the receiving side.

The present invention solves the above-mentioned conventional problems, and a security device capable of converting various bit streams into normal signals by simply replacing the IC card without adding a basic device. It is intended to provide.

[0005]

In order to achieve the above object, the present invention comprises an antenna and a tuner for receiving radio waves of a plurality of data broadcasts, and scrambles the bit stream output from the tuner. When it is present, it has a descrambling unit for descrambling it and a signal decoding unit consisting of a decoder for decoding the coded signal, and further comprises two storage devices for storing the data used by this signal decoding unit. The storage device is a fixed storage device, the other storage device is a portable IC card and a reader, and data for descramble and data decoding common to the plurality of data broadcasts is stored in the fixed storage device. The means of storing and writing the unique data to the IC card for each data broadcast was used.

[0006]

The bit stream transmitted by the data broadcasting may or may not be scrambled, and there are a plurality of scramble systems depending on the information supply entity. Also, in all data broadcasting, the bit stream is encoded by each protocol,
Decoding also differs depending on the encoding method. Here, descrambling and decoding require data for decoding the algorithm, but the required data is stored in each of the two storage devices. The fixed-type storage device has a function of extracting a part common to all data broadcasts and storing general-purpose data used for descrambling and decoding in any bit stream. On the other hand, I
Decoded data unique to each data communication is stored in the C card, and the IC card is used after being changed according to the data.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The figure shows a block diagram of a data decoding portion necessary for the present invention in the receiving device, 1 is an antenna for data reception, 2 is a tuner capable of capturing each frequency of a plurality of data broadcasts, 3 is a tuner 2 If the bit stream of 1 is scrambled, it is descrambled, and it is a signal decoding unit for performing processing of decoding the encoded bit stream. This signal decoding unit is composed of a descrambler 4 and a decoder 5. The decoder 5 has a function of decoding the broadcast data into a normal bitstream when the encoder encodes the broadcast data, and of course, cancels the packetized packet of the data string and only the data body is decoded. It also has a function to restore to a stream. When the normal data is restored in this way, it is output to the data processing unit 6 in the subsequent stage, and the processing according to the content of the data is performed.

Next, 7 is a fixed storage device, 8 is a portable storage device reading device, and 9 is an IC card. Therefore, in this embodiment, the bit stream is decrypted using two storage devices. Here, the storage device 7 stores descrambling data and descrambling data that are commonly used by the descrambling unit 4 and the decoding unit 5 in the signal decoding unit 3, and the IC card 9 stores a plurality of data broadcasting data. Data necessary for unique processing other than the common part is written in each of a plurality of IC cards. For example, if all the data broadcasts adopted in the present invention perform packet transmission by a protocol compliant with CCITT recommendation, the data for packet restoration is stored in the storage device 7, and the decoder 5 is stored in the storage device 7.
The packet is canceled while reading the data from. On the other hand, if completely different algorithms are used for scrambling, since the release data are different, they are stored in different IC cards 9.

In such a structure, in order to receive data on a specific radio wave of the radio waves that can be received by the tuner 2, for example, an IC card 9 suitable for descrambling and decoding peculiar to the data is inserted into the reading device 8. Then, simply by matching the channel of the tuner 2 to the communication channel, the received bit stream is input to the signal decoding unit 3, and the descrambling unit 4 reads the data stored in the storage device 7 and / or the IC card 9 while reading the data. The data is descrambled, the data is subsequently decoded by the decoder 5, and the data is transmitted to the data processing unit 6 in the subsequent stage. The data processing unit 6 may have various modes. For example, if the data string is karaoke data, an electronic sound source and a video device are connected, and if it is a computer game, a game device is connected.
It is optional. Further, it is of course possible to connect a general computer device and use it as a publicly known data communication terminal.

[0010]

According to the present invention, a signal decoding unit having both a descrambling unit and a decoding unit is provided as a terminal device for data broadcasting, and the decoding unit separates the data required for signal processing into two types of storage devices. It is assumed that the signal decoding data commonly used for data broadcasting of a plurality of channels is stored in a fixed storage device, and the unique decoding data is separately stored in the IC card. Therefore, when the transmission protocol and the scramble system are different as in the conventional case, it is possible to decode all the signals that the tuner can receive by simply replacing the IC card, as compared with the case where the entire device is added. As a result, it is possible to reduce the size of the entire apparatus, and at the same time, even if there is a data broadcasting station that has joined after that, it can be received by simply replenishing the IC card, which is very efficient for the user. It was possible to provide a security device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Antenna for Data Reception 2 Tuner 3 Signal Decoding Section 4 Scrambler 5 Decoder 6 Data Processing Section 7 Storage Device 8 Reading Device 9 IC Card

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04N 7/16 Z 7251-5C

Claims (1)

[Claims] 1. A descrambling device provided with an antenna and a tuner for receiving radio waves of a plurality of data broadcasts, and a descrambling device for descrambling a scrambled bit stream output from the tuner when the scrambled signal is added. 2 is provided with a signal decoding unit composed of a decoder for decoding the generated signal, and further stores the data used in this signal decoding unit.
One storage device is a fixed type storage device, and the other storage device is a portable IC card and reader, and data for descrambling and data decoding common to a plurality of data broadcasts described above. Is stored in the fixed type storage device, and unique data is written in an IC card for each data broadcast.