JP2000125272A - Message transmission method in broadcast system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a message transmission method in a broadcast system that transmits diversified messages with a small data transmission quantity. SOLUTION: In the case of transmitting a message in the broadcast system, a message storage section 33 at a receiver side stores a table on which a plurality of kinds of message patterns are described, and a transmitter side transmits the number to specify the message pattern in this table and a parameter than specifies part of character strings in the message pattern to the receiver side by means of an EMM. A message decoding section 32 at the receiver side inserts a parameter to the specified message pattern to decode the message. Thus, diversified message can be transmitted with a small data transmission quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting a message in a broadcasting system for transmitting a message from a broadcasting transmitting side to a receiving side, and more particularly to a method for displaying various messages with a small data transmission amount. .

[0002]

2. Description of the Related Art In digital broadcasting, program information (ECM: Entitlement Control Message) is added to video and audio data of a program.
And individual information (EMM: Entitlement Management Messag
e) is multiplexed and broadcast.

[0003] The ECM includes a scramble key (Ks) obtained by scrambling video and audio data of a program, determination information for determining a contract enabling viewing of the program, and the like. Contains information for each receiving device, such as contract information of each receiving device and information on a work key (Kw) obtained by encrypting Ks.

[0004] In the conventional broadcasting system, the EMM is used to notify each receiving device of a contract renewal or a fee for viewing, for example, "Thank you for contracting,""The last month's viewing fee has not been paid." Sending a message about has been done.

FIG. 11 shows a configuration of a conventional transmitting side for transmitting a message using an EMM. The transmitting side includes a scrambler 11 for scrambling video and audio data of a program using Ks, a Ks encryptor 12 for encrypting an ECM including the Ks with Kw, and a message encoder 14 for encoding a message. And Kw for encrypting an EMM containing Kw or an encoded message with a master key Km
It comprises an encryption unit 13, a Km management unit 15 for managing Km, and a multiplexing unit 16 for multiplexing and transmitting data output from each unit.

On the other hand, the receiving side is, as shown in FIG. 13, separated by a separating unit 21 for separating the multiplexed received signal, a Km managing unit 26 for managing the master key Km, and encrypted using the Km. A Kw decoding unit 25 for decoding the existing EMM;
A Ks decryption unit 24 for decrypting the encrypted ECM using the Kw decrypted by the decryption unit 25; a program information management unit 27 for managing the ECM decrypted by the Ks decryption unit 24;
The individual information management unit 28 that manages the EMM decrypted by the w decryption unit 25 compares the contract information included in the EMM with the determination information included in the ECM to determine whether the user has the viewing right to the program. Using the Ks output control unit 29, which outputs the Ks decoded by the Ks decoding unit 24 when the user has the viewing right, and the Ks output from the Ks output control unit 29. A descrambling unit 22 for descrambling the video and audio of the program, a message decoding unit 32 for decoding the message output from the individual information management unit 28, a message presenting unit 31 for adjusting the display time of the message, a program and a message And a display control unit 34 for performing control for displaying on the screen.

A Km management unit 26, a Kw decoding unit 25, and a Ks
Decoding unit 24, program information management unit 27, individual information management unit 28, viewing right determination unit 30, Ks output control unit 29, and message decoding unit 32
Are provided in the security module 23 composed of an IC card or the like.

In this broadcasting system, video and audio of a program are encrypted with Ks, and the Ks is encrypted with Kw.
Is encrypted with Km and transmitted. Also, a message addressed to an individual is encoded, then included in the EMM, encrypted with Km, and transmitted.

On the receiving side, Kw is decoded by Km, and Kw is decoded.
To decode Ks and convert the video and audio of the program for which
s to descramble and display on the screen. Also, EMM
The message sent by is also decrypted and displayed on the screen.

In some cases, a message is not encrypted. At this time, as shown in FIG. 12, the encrypted Kw and the non-
The message transmitted by the MM and included in the separated EMM is directly input to the message decoding unit 32 on the receiving side.

[0011]

However, in a conventional system for transmitting an individual message using an EMM,
The following problems exist.

[0012] Since EMMs are sent on an individual basis,
In the case of sending a message, the data including the destination and the message character string must be transmitted by the number of destinations. Therefore, when the message volume is large, EM
Much bandwidth is used for M transmission. EM
Since M is basically transmitted in the same band as the program, EMM
When the number of bytes of the program becomes longer, the transmission band of the program is correspondingly reduced, and transmission of the program is hindered.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a message transmission method in a broadcasting system capable of transmitting various messages with a small data transmission amount.

[0014]

Therefore, according to the message transmission method of the present invention, a plurality of types of messages are transmitted on the receiving side.
The pattern is stored, the transmitting side transmits a number specifying the message pattern and a parameter defining a character string of a part of the message pattern by EMM, and the receiving side inserts the parameter into the specified message pattern. To decrypt the message.

Therefore, various messages can be transmitted with a small data transmission amount.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, when transmitting a message in a broadcasting system, a receiving side holds a table describing a plurality of types of message patterns, and a transmitting side transmits the message pattern. A number specifying the message pattern in the table and a parameter defining a character string of a part of the message pattern are transmitted by EMM, and the receiving side inserts the parameter into the specified message pattern and decodes the message. And
Various messages can be transmitted with a small amount of data transmission.

According to a second aspect of the present invention, the receiving side holds a table in which a plurality of types of parameters are described, and the transmitting side specifies the parameters by the parameter numbers described in the table. , EMM
It is possible to reduce the amount of data transmission to be sent.

According to the third aspect of the present invention, the transmitting side transmits the specific value of the parameter by EMM, and can transmit a message having various contents.

According to a fourth aspect of the present invention, the description of the message pattern table or the parameter table held on the receiving side is updated by the transmitting side, so that the contents of the message can be diversified. Can be planned.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) In the broadcasting system of the first embodiment, as shown in FIG. 1, a message storage unit 33 is provided in the security module 23 on the receiving side. The other block configuration is the same as the conventional (FIG. 13).

As shown in FIG. 3, the message storage unit 33 includes a message table 41 in which various message patterns are described, and a setting parameter table 42 in which parameters inserted in the message are described. ing. As shown in FIG. 4, the message contents are described in the message table 41 in association with the message ID. The setting parameter table 42 contains
As shown in FIG. 5, corresponding to the setting parameter ID,
The value is described.

ID described in message table 41
In the message “Thank you very much for% V1, like% 2”, “% V1” indicates that the value of the setting parameter is inserted therein. ID100
In the message "The charge for this month is% P1,""%P1" indicates that the transmission parameter transmitted from the transmission side is inserted therein.

On the other hand, the same block configuration as in the prior art (FIG. 1)
The transmitting side having “1, FIG. 12) transmits the message table 41 stored in the message storing section 33 of the receiving side.
And the contents of the setting parameter table 42 are known, and by using the message ID and setting parameter ID of these tables, the data amount of the message to be transmitted is reduced.

As shown in FIG. 6, the data structure of an EMM for transmitting a message is composed of an EMM header and an EMM message indicating the message content. The EMM message specifies a message pattern as shown in FIG. Message ID, number of subsequent transmission parameters (n), value of first transmission parameter, value of second transmission parameter, ‥, value of nth transmission parameter, number of subsequent setting parameters (m), 1 It is composed of a data string of the value of the second setting parameter, the value of the second setting parameter, ‥, the value of the m-th setting parameter.

The EMM message to which the EMM header is added is encrypted with Kw or multiplexed with other data without being encrypted, and transmitted from the transmission side.

On the receiving side, the separating unit 21 converts the received data into
The video and audio data of the scrambled program, ECM and EMM are separated, the video and audio data of the scrambled program are descrambled by the descrambler 22, and the ECM is decoded by the Ks decoder 24.
And the EMM to the Kw decoding unit 25.

In the Kw decoding unit 25 input by the EMM, the Km
Using the Km managed by the management unit 26, the encrypted EMM is decrypted, and the decrypted EMM message is output to the individual information management unit 28. The individual information management unit 28 outputs the EMM message to the message decoding unit 32.

The message decoding unit 32 to which the EMM message is input stores the message pattern of the specified message ID in the message storage unit 33.
The values of the transmission parameters included in the EMM message are read out sequentially from the table 41 at the transmission parameter insertion point of the message pattern, and the EMM message is specified at the message pattern setting parameter insertion point. The message is decoded by reading the value corresponding to the setting parameter ID from the setting parameter table 42 and inserting it.

The decrypted message is output from the message presenting unit 31 in a timely manner, and under the control of the display control unit 34, is superimposed and displayed on the screen on which the video of the program is displayed.

FIG. 8 shows an EMM message and a message obtained by decoding the EMM message in comparison. FIG. 8 (a)
Then, the value of the transmission parameter “$ 1,000” transmitted in the EMM message is inserted into the transmission parameter insertion position of the message pattern of the message ID 100,
The message "This month's fee is $ 1,000" is decrypted. In FIG. 8B, the message I
The value “Nippon Taro” of the setting parameter ID 1 is inserted at the insertion position of the setting parameter of the message pattern of D 2, and the message “Thank you, Nippon Taro” is decoded.

As described above, in this broadcasting system, various messages can be displayed by using the message ID, the setting parameters, and the transmission parameters, even though the data amount of the EMM message is small.

In FIG. 1, the message decryption section 32 and the message storage section 33 are provided in the security module 23. However, they can be provided outside the security module 23 as shown in FIG. is there.

(Second Embodiment) In the broadcasting system of the second embodiment, as shown in FIG. 9, a security module 23 on the receiving side sends a message for managing updating of data stored in the message storage unit 33. An update management unit 35 is provided. Other configurations are the same as those of the first embodiment (FIG. 1).

In this system, the message table 41 of the message storage unit 33 and the setting parameter table
The initial data described in 42 is transmitted from the transmitting side by EMM, is decoded by the Kw decoding section 25 on the receiving side, and is passed from the individual information managing section 28 to the message updating managing section 35.
In response to this, the message update management unit 35 writes this data in the message table 41 and the setting parameter table 42 of the message storage unit 33.

Further, the transmission side transmits update data of the message table 41 and the setting parameter table 42 as needed, and accordingly, the message update management unit 35 sets the message table 41 of the message storage unit 33 and the The description in the parameter table 42 is updated.

As described above, in this broadcasting system, the message table 41 and the setting parameter table 42 of the message storage unit 33 on the receiving side can be rewritten at any time according to the intention of the transmitting side. Various messages can be sent to the side.

In FIG. 9, the message decryption unit 32, the message storage unit 33, and the message update management unit 35 are provided in the security module 23. However, as shown in FIG. Can also be provided.

[0039]

As is apparent from the above description, the message transmission method of the present invention can transmit various messages despite the small amount of EMM data transmission. Therefore, without squeezing the transmission band of the program,
Various messages can be displayed.

Further, since messages can be transmitted only by the EMM, various messages can be transmitted without greatly changing the current broadcasting system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a receiving side according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing another configuration on the receiving side according to the first embodiment of the present invention;

FIG. 3 is a diagram illustrating a configuration of a message storage unit according to the first embodiment;

FIG. 4 is a diagram showing a data configuration of a message table according to the first embodiment;

FIG. 5 is a diagram showing a data configuration of a setting parameter table according to the first embodiment;

FIG. 6 is a diagram illustrating an EM transmitted by the broadcast system according to the first embodiment;
A diagram showing a data structure of M,

FIG. 7 is an EM transmitted by the broadcast system according to the first embodiment;
A diagram showing an example of an M message,

FIG. 8 shows an EM transmitted by the broadcast system according to the first embodiment;
The figure which shows the correspondence of the M message and the decrypted message,

FIG. 9 is a block diagram showing a configuration of a receiving side according to a second embodiment of the present invention;

FIG. 10 is a block diagram showing another configuration on the receiving side according to the second embodiment of the present invention;

FIG. 11 is a block diagram showing a configuration of a transmission side.

FIG. 12 is a block diagram showing another configuration on the transmission side.

FIG. 13 is a block diagram showing a configuration of a conventional receiving side.

[Explanation of symbols]

 11 Scramble section 12 Ks encryption section 13 Kw encryption section 14 Message encoding section 15 Km management section 16 Multiplex section 21 Separation section 22 Descramble section 23 Security module 24 Ks decryption section 25 Kw decryption section 26 Km management section 27 Program information management section 28 Individual information management unit 29 Ks output control unit 30 Viewing right judgment unit 31 Message presentation unit 32 Message decoding unit 33 Message storage unit 34 Display control unit 41 Message table 42 Setting parameter table

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hironori Murakami 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Tsuyoshi Sawasawa 1006 Kadoma Kadoma, Osaka Pref. Matsushita Information System Co., Ltd. (72) Inventor Kazuhiro Machida 1006 Kadoma, Kadoma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 5C063 AA01 DA07 EB37 EB50 5C064 BA01 BB05 BC10 BC23 BD13

Claims (4)

[Claims] 1. A parameter storing a table describing a plurality of types of message patterns on a receiving side, and a parameter specifying a number specifying a message pattern of the table and a character string of a part of the message pattern on a transmitting side. Is transmitted in EMM, and the receiving side
A message transmission method in a broadcasting system, comprising: decoding a message by inserting a parameter into a pattern. 2. The message according to claim 1, wherein the receiving side holds a table in which a plurality of types of parameters are described, and the transmitting side specifies the parameters by parameter numbers described in the table. Transmission method. 3. The transmitting side sets a specific value of the parameter to E
The message transmission method according to claim 1, wherein the transmission is performed by MM. 4. The message transmission method according to claim 1, wherein the description of the table of the message pattern or the table of the parameter held by the receiving side is updated by the transmitting side.