DE102006016875B4 - Method for transmitting and reproducing audio and video data - Google Patents

Abstract

Method for transmitting audio / video (A / V) data with a transmitter and for reproducing an associated A / V data content with at least one DVB receiver and a corresponding CI module, wherein said at least one DVB receiver has a CI to which the CI module is connected, and wherein the transmitter sends the A / V data in an A / V data format, which the at least one DVB receiver can not interpret, and wherein the associated CI module in the Able to convert said A / V data format into an A / V data format that the DVB receiver can interpret, characterized in that this CI module registers with the DVB receiver with a simulated CAS-ID, wherein the broadcaster, within the framework of the DVB standard, modifies the appropriate service information (SI) tables, in particular the program map table (PMT) and / or the conditional access table (CAT), for transmission in such a way that they are included for those in the transport stream Program me, whose reproduction by the DVB receiver requires conversion of the A / V data format to which said simulated CAS ID of the CI module refers.

Description

The invention relates to a method for transmitting and reproducing audio and video data.

The abbreviation "A / V" in the following is the term "audio / video" to understand.

The term "A / V data content" refers to the sound and image information of the A / V data to be transmitted and reproduced.

The form in which the A / V data is available in each case is defined in the corresponding standards and should be referred to here by the term "A / V data format". For example, MPEG-2, MPEG-4, AVI, WAV and mp3 are to be regarded as A / V data formats.

In the following, the term "transmission protocol" shall refer to the form of the packetization and interleaving of the A / V data present in certain A / V data formats for transmission and the form of the additional information required for this (for example the so-called "header"). Also, certain compression and encryption techniques may be part of the transmission protocol. For example, the so-called "IP" (Internet Protocol) should be referred to as a transmission protocol.

The term "framework of the DVB standard" is understood to mean the transmitter-side processing of the data to be transmitted in accordance with the DVB standard, which is necessary in the prior art for the transmission of A / V data contents to DVB receivers. The scope of the DVB standard includes, among other things, the so-called "SI" (Service Information) tables.

Thus, various transfer protocols are known in the art which may include A / V data in arbitrary A / V data formats.

The prior art discloses a variety of DVB receivers capable of reproducing the A / V data content of data transmissions conforming to ISO / IEC 13818-1 / 2/3 standard.

Further, in the prior art, DVB receivers are known which can reproduce the A / V data content of A / V data which is in an A / V data format conforming to the MPEG-4 standard.

Furthermore, many transmission protocols exist in the prior art which, even if they are transmitted within the framework of the DVB standard, can not be interpreted by the DVB receivers known in the prior art.

It is known, for example, that within the framework of the DVB standard, data transmissions can take place in accordance with the ISO / IEC 13818-6 standard via the so-called "IP" (Internet Protocol). Furthermore, it is known that A / V data can be transmitted over the IP. However, there are no known DVB receivers in the prior art which are capable of reproducing the A / V data content of an A / V data transmission which is in accordance with the ISO / IEC 13818-6 standard.

Out DE 20 2005 003 176 an arrangement is known in which "the data-reduced AV signals which can not be evaluated by the radio receiver with CI interface are transmitted via the interface to a converter which converts the signals into a format that can be evaluated by the receiver and sends them back to the receiver via the interface Evaluation provides. "

However, a large number of DVB receivers exist on the market, which do not use the transport stream they receive from their CI when playing unencrypted programs, but which tap their internal transport stream for the reproduction of unencrypted programs before the CI. These DVB receivers can be enabled in the known state of the art only with a corresponding specific modification of their system software by their respective manufacturer for the use of a CI module, as in DE 20 2005 003 176 is described.

WO 2004/040910 A1 discloses an apparatus for transcoding a digital audio / video stream for the purpose of adapting to existing television equipment.

ETSI TS 101 699 V1.1.1 (1999-11). Digital Video Broadcasting (DVB); Extensions to the Common Interface Specification. ETSI, F-06921 Sophia Antipolis Cedex, 1999, pp. 1-14, 75-83 describes a number of extensions to the command interface protocols of the Common Interface (CI) standardized in EN50221, particularly with respect to a command interface and CI compliance profiles.

ISO / IEC 13818-1. Information technology - Generic coding of moving pictures and associated audio information: Systems. ISO, CH-1211 Geneva 20, Second edition, 2000, p. I-xvii, 1-8, 43-50, 69, 70, 107, 108 describes merging multiple audio, video or other data streams into one or more Currents suitable for transmission or storage.

US 2006/0053457 A1 discloses a module, system and method for processing digital signals.

DE 10333252 A1 describes an apparatus and method for transcoding compressed data.

The object of the present invention is to develop a method according to which all DVB receivers that have a CI, even without changing their system software, the A / V data content transmitted A / V data can play, if this in the context of the DVB standard in an A / V data format, which can not be interpreted by these DVB receivers in the current state of the art.

This object is achieved by the method according to independent claim 1.

• 1.) Das aus DE 20 2005 003 176 bekannte CI-Modul wird in seiner Software derart modifiziert, dass es sich bei einem daran angeschlossenen DVB-Receiver sowohl als CI-CAM als auch mit einer erfindungsgemäßen sogenannten „simulierten CAS-ID” anmeldet. Dabei steht der Begriff „simulierte CAS-ID” für eine Identifikationsbezeichnung, welche von der DVB-Receiversoftware als derart entschlüsselungssystemspezifisch interpretiert wird, als diene sie der Identifikation und dem Betrieb eines bestimmten Entschlüsselungssystems, die aber tatsächlich nicht zum Betrieb eines bestimmten Entschlüsselungssystems eingesetzt wird, sondern lediglich dazu dient, ein dementsprechendes Verhalten der DVB-Receiversoftware auszulösen. Im vorliegenden Fall wird durch die Verwendung der simulierten CAS-ID der als dazugehörig identifizierte Transportstrom vom DVB-Receiver über sein CI geleitet.
• 2.) Vom Sender werden im Rahmen des DVB-Standards die sogenannte „PMT” (Program Map Table) und die sogenannte „CAT” (Conditional Access Table) derart modifiziert, dass sie für diejenigen im Transportstrom vorhandenen Programme, für deren Wiedergabe eine erfindungsgemäße Formatwandlung notwendig ist, auf die besagte simulierte CAS-ID des CI-Moduls verweisen.
• 3.) Der Sender trägt in jede relevante PMT einen Hinweis auf die PID des übertragenen Datenstroms ein.
• 4.) Der Sender modifiziert weiterhin die „PAT” (Program Association Table), die PMT und die „SDT” (Service Description Table) dahingehend, dass sie für die im IP-Strom vorhandenen Programme die sogenannte „DVB-konforme Signalisierung” beinhalten. Diese DVB-konforme Signalisierung beinhaltet die Informationen, die nötig sind, um aus dem übertragenen Datenstrom einen DVB-Kompatiblen Transportstrom aufzubauen, insbesondere die unterschiedlichen reservierten PIDs der verschiedenen Audio- und Videokomponenten der einzelnen Programme.
• 5.) Der DVB-Receiver empfängt über den Sendeweg den Transportstrom, welcher unter anderem die A/V-Daten und die modifizierten SI-Tabellen beinhaltet.
• 6.) Die PMT und/oder die CAT signalisieren dem DVB-Receiver eine Verschlüsselung gemäß der simulierten CAS-ID des CI-Moduls.
• 7.) Die A/V-Daten, welche der Programmwahl des Benutzers entsprechen, werden von dem ihrem Übertragungsprotokoll entsprechenden CI-Modul zerlegt, in sogenannte „PES” (paketierte Elementardatenströme) gepackt und auf den ihnen vom Sender zugeordneten PIDs in einen DVB-konformen Transportstrom eingefügt, dessen A/V-Dateninhalt von dem an das CI-Modul angeschlossenen DVB-Receiver wiedergegeben werden kann.
• 8.) Dieser Transportstrom wird vom CI-Modul über das CI an den DVB-Receiver übertragen und der A/V-Dateninhalt dieses Transportstroms wird daraufhin von dem DVB-Receiver wiedergegeben.

The method according to the invention comprises several parts:

• 1.) That off DE 20 2005 003 176 known CI module is modified in its software so that it logs on at a connected DVB receiver both as CI-CAM and with a so-called "simulated CAS-ID" according to the invention. The term "simulated CAS-ID" stands for an identification designation which is interpreted by the DVB receiver software as being specific to a decryption system, as if it serves to identify and operate a particular decryption system, but which is not actually used to operate a particular decryption system. but only serves to trigger a corresponding behavior of the DVB receiver software. In the present case, by using the simulated CAS-ID, the transport stream identified as belonging to it is conducted by the DVB receiver via its CI.
• 2.) Within the framework of the DVB standard, the transmitter modifies the so-called "PMT" (Program Map Table) and the so-called "CAT" (Conditional Access Table) in such a way that it provides for those programs present in the transport stream for their reproduction Format conversion, refer to the said simulated CAS ID of the CI module.
• 3.) The transmitter enters in each relevant PMT an indication of the PID of the transmitted data stream.
• 4.) The transmitter also modifies the "PAT" (Program Association Table), the PMT and the "SDT" (Service Description Table) in such a way that they contain the so-called "DVB-compliant signaling" for the programs present in the IP stream , This DVB-compliant signaling includes the information necessary to build a DVB-compatible transport stream from the transmitted data stream, in particular the different reserved PIDs of the various audio and video components of the individual programs.
• 5.) The DVB receiver receives the transport stream via the transmission path, which contains among other things the A / V data and the modified SI tables.
• 6.) The PMT and / or the CAT signal to the DVB receiver an encryption according to the simulated CAS-ID of the CI module.
• 7.) The A / V data corresponding to the program selection of the user are decomposed by the CI module corresponding to their transmission protocol, packaged in so-called "PES" (Packet Elementary Streams) and converted into a DVB on the PIDs assigned to them by the transmitter. inserted conforming transport stream whose A / V data content can be reproduced by the DVB receiver connected to the CI module.
• 8.) This transport stream is transmitted from the CI module via the CI to the DVB receiver and the A / V data content of this transport stream is then reproduced by the DVB receiver.

This invention provides advantages over the prior art, which will be explained below.

With this invention, the possibility is created to reproduce an A / V data content transmitted in the course of the DVB standard in any transmission protocol with all the prior art DVB receivers having a CI without the software of this DVB Receiver must be changed.

In particular, the compatibility between A / V data transmitted in the IP and commercially available DVB receivers is thereby also established, which creates a further interface between DVB receivers and the Internet. This also creates the possibility for the user to receive television programs transmitted over the IP with any DVB receiver known in the art which has a CI.

Another advantage of the invention is that the CI module is additionally capable of transcoding the A / V data format of the A / V data. A program provider can thus choose his A / V data formats independently of the corresponding DVB standards. For example, a program provider who is interested in achieving the best possible quality at low transmission rates can, for example, select the mp3 format for transmitting a radio broadcast. The playback of the A / V data content by the DVB receiver may take place after the conversion of the A / V Data formats in a high-quality DVB standard (MPEG 1 - Layer 2 with the highest possible data rate) are carried out without burdening the transmission path with this high data rate. Thus, a program provider in cooperation with a receiver manufacturer can equip certain DVB receivers with the ability to interpret the mp3 format and at the same time to the owners of all other DVB receivers having a CI via a CI module modified according to the invention also provide the ability to play the A / V data content of these broadcasts in the best possible DVB format of each DVB receiver.

In principle, so the audio broadcasting in a non-data-reduced audio format is possible, for example, the transmission of a classical concert by a cultural station, although this option probably will not be used due to the associated high data rate in the foreseeable future. With such specified CI modules, any such DVB receivers that have a CI will be capable of playing back the associated A / V data content, with maximum playback quality still limited by the best possible DVB receiver data reduction standards. In addition, however, this transmission protocol can also be received by other receiving and reproducing devices, optionally stored and reproduced, for example, from a PC that receives Internet via satellite or from a special DVB receiver whose software is the reproduction of the transmitted A / V data formats allowed.

An advantageous development of the invention consists in that the CI module additionally has at least one decoding system. This at least one decoding system additionally registers with the DVB receiver under its corresponding CAS-ID. Thus, those transmitted A / V data from the CI module can be decrypted, which can be displayed by the DVB receiver without format conversion, without the DVB receiver to have another CI or a corresponding internal decoding system must have. Also, the A / V data to be converted by the CI module can be transmitted encrypted and both decrypted and converted by the CI module.

Further advantageous embodiments and further developments are characterized in the subclaims.

In the following, a preferred embodiment of the invention will be explained with reference to a drawing.

1 describes the course of a method according to the invention. Mean

LIST OF REFERENCE NUMBERS

1

program providers

2

DVB Receivers

3

CI module

4

processor unit

5

storage unit

6

transmitter

7

transmission path

8th

transmitting antenna

9

TV satellite transmission

10

receiving antenna

11

transport stream

12

computer

13

CI slot

14

Leased line

15

CI

As in 1 represented, the subscriber of the program provider receives from the program provider ( 1 ) an IP standard according to the invention modified CI module ( 3 ). This CI module ( 3 ) is placed in the so-called "CI slot" ( 13 ) of the DVB receiver, it then contacts the DVB receiver ( 2 ) as CI-CAM as well as with the simulated CAS-ID and is transmitted by the DVB receiver ( 2 ) identified as a corresponding CI-CAM with a special decryption system.

Furthermore, the program provider ( 1 ) the A / V data of a program to be transmitted via a dedicated line ( 14 ) (for example, DSL) in the IP to the transmitter ( 6 ). The transmitter ( 6 ) puts the IP-stream containing the A / V data of this one program into the PID 100 within the framework of the DVB standard and enters this in the PMT of this program, so that the PMT of this program can access this IP Current refers. Furthermore, the PAT, the PMT and the SDT from the transmitter ( 6 ) are modified to include DVB-compliant signaling for the programs present in the IP stream.

In addition, the PMT as well as the CAT receives from the transmitter ( 6 ) the reference to the simulated CAS-ID of the CI module. The corresponding with a computer ( 12 ) is calculated by the transmitter ( 6 ) via the transmission path ( 7 ) to the DVB receiver ( 2 ) transfer.

After receiving such a conditioned signal via the transmission path ( 7 ) the DVB receiver ( 2 ) encodes this signal as having an encryption system corresponding to the simulated CAS-ID registered for data exchange via its CI. Accordingly, the transport stream ( 11 ) with appropriate program selection by the user via the to the CI ( 15 ) connected CI module ( 3 ).

• 1. Identifikation des IP-Stroms des gewählten Programms gemäß der PMT auf der PID 100
• 2. Extrahierung der A/V-Daten aus diesem IP-Strom
• 3. Erzeugung von PES aus diesen A/V-Daten
• 4. Aufteilen der Audio- und Videodaten des gewählten Programms auf die ihnen zugeordneten separaten PIDs
• 5. Erzeugung eines Transportstroms, welcher diese PES beinhaltet, und der zum angeschlossenen DVB-Receiver kompatibel ist
• 6. Übertragung dieses Transportstroms an den DVB-Receiver

In the CI module ( 3 ) find in the processor ( 4 ) the following events take place:

• 1. Identification of the IP current of the selected program according to the PMT on the PID 100
• 2. Extract the A / V data from this IP stream
• 3. Generation of PES from these A / V data
• 4. Split the audio and video data of the selected program into the separate PIDs assigned to them
• 5. Generation of a transport stream which includes this PES and which is compatible with the connected DVB receiver
• 6. Transmission of this transport stream to the DVB receiver

Claims (2)

Method for transmitting audio / video (A / V) data with a transmitter and for reproducing an associated A / V data content with at least one DVB receiver and a corresponding CI module, wherein said at least one DVB receiver has a CI to which the CI module is connected, and wherein the transmitter sends the A / V data in an A / V data format, which the at least one DVB receiver can not interpret, and wherein the associated CI module in the Able to convert said A / V data format into an A / V data format that the DVB receiver can interpret, characterized in that this CI module registers with the DVB receiver with a simulated CAS-ID, wherein the broadcaster, within the framework of the DVB standard, modifies the appropriate service information (SI) tables, in particular the program map table (PMT) and / or the conditional access table (CAT), for transmission in such a way that they are included for those in the transport stream Progra mme whose playback by the DVB receiver requires conversion of the A / V data format to which the simulated CAS ID of the CI module refers. A method according to claim 1, characterized in that the CI module additionally comprises one or more decryption systems, which additionally each register with their corresponding CAS-ID at the receiver.

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