WO2005076617A1

WO2005076617A1 - Multimedia terminal

Info

Publication number: WO2005076617A1
Application number: PCT/CN2004/001375
Authority: WO
Inventors: Dahai Zhai; Zhibo Wang; Yanhui Yang; Xiaohu Gao
Original assignee: Datang Telecom Technology Co., Ltd Optical Communication Branch; Datang Microelectronics Technology Co., Ltd.
Priority date: 2004-01-19
Filing date: 2004-11-29
Publication date: 2005-08-18
Also published as: CN1294755C; CN1558674A

Abstract

The present invention relates to a multimedia terminal for connecting the TV terminal to the data communication network. It comprises a network interface unit, a data processing unit which is connected to the network interface unit, a control unit which is connected to the network interface unit, the data processor unit, and the following respective units, a storage unit which is connected to the data processing unit and is used for storing the multimedia information separated by the data processing unit, a decoder unit which is connected to the data processing unit and the storage unit, an display output unit which is connected to the decoder unit and the TV terminal, and an external control input unit which is connected to the control unit. The multimedia terminal of the invention is capable of previously downloading and storing the multimedia information demanded by the subscribers in the case that the existing data communication network can not entirely ensure the bands accessed by the subscribers, so as to perform a non-real time broadcasting, and enable the subscribers to view the programs continuously and uninterruptedly.

Description

Multimedia terminal

Technical field

The present invention relates to the field of multimedia technology, and in particular, to a multimedia terminal applied in the field of multimedia technology.

Background technique

With the continuous development of modern network technology and multimedia communication technology, set-top-box (STB) products based on user-interactive video-on-demand (VOD) technology have gradually entered millions of households. This type of set-top box device has changed the way users can only passively watch a limited number of fixed radio and television channels. It allows users to flexibly and conveniently choose to play multimedia resources on the network according to their needs, which is more suitable for the needs of home entertainment. The application of the existing video-on-demand set-top box devices basically only stays in the small network range of the community level. In this type of network, the server will store certain multimedia data resources to provide a limited number of users. Video on demand service. In order to meet the user's video-on-demand requirements, the network must guarantee a stable data bandwidth for each online user. For example, when users request multimedia data in the MPEG2 format, the network must guarantee to provide 3 Mbps to 8 Mbps data traffic. Due to the small number of users in a cell-level network, as long as the server is configured properly, it can better meet the needs of users.

However, when the video-on-demand service is further extended to a large-scale metropolitan area network, due to the sharp increase in the number of users, the network may not be able to guarantee that sufficient access bandwidth is allocated to each set-top box device, resulting in a set-top box that cannot be continuous. When receiving multimedia information, users cannot watch continuous broadcast programs through the set-top box; it may even cause serious consequences such as the set-top box being disconnected, unable to access the network, and network paralysis.

At the same time, due to the interconnected and open nature of data communication networks, it will be difficult to guarantee the security and legality of data circulating on the network. Dissemination of illegal speech through the Internet and illegal acts such as piracy through the Internet have also repeatedly appeared on the current Internet. Therefore, when connecting a TV to a data communication network through a set-top box device, how to flexibly and effectively verify the legitimacy of a user ’s identity and prevent an illegal network-side device from sending illegal media information to the user, And effective knowledge copyright protection of multimedia data resources interactive on the network, etc., are all problems that need to be solved urgently in the promotion process of interactive video on demand services.

Summary of the invention

The present invention provides a multimedia terminal with a storage function, so as to realize that in the case that the existing data communication network cannot completely guarantee the user's access bandwidth, it can download and store the multimedia information requested by the user in advance, so that subsequent non-real-time playback is performed. So that the user can watch the continuously playing programs.

To solve the above problems, the present invention provides a multimedia terminal for connecting a television terminal to a data communication network, including:

A network interface unit connected to the data communication network and configured to send and receive data information from the data communication network;

A data processing unit connected to the network interface unit and configured to process various uploaded information input by the multimedia terminal into data information conforming to a corresponding protocol of the data communication network and send the data information to the data communication network through the network interface unit; The data information received from the network interface unit is processed to separate multimedia information and control information;

A control unit, which is respectively connected to the network interface unit, the data processing unit, and each subsequent unit, and is configured to receive control information sent by the data processing unit and control interaction between the units;

A storage unit connected to the data processing unit and configured to store multimedia information separated by the data processing unit;

A decoding unit, respectively connected to the data processing unit and the storage unit, and configured to decode and process multimedia information separated by the data processing unit or multimedia information stored in the storage unit;

A playback output unit, which is respectively connected to the decoding unit and the television terminal, and is configured to convert the decoded multimedia information sent by the decoding unit into an analog or digital signal suitable for playing by the television terminal, and send it to the television terminal for playing;

An external control input unit connected to the control unit and configured to input user operation information to the control unit, so that the control unit converts the operation information input by the user into the multimedia Upload information entered by the mobile terminal.

The multimedia terminal further includes a first descrambler, and the data processing unit and the storage unit are further connected through the first descrambler and the decoding unit, and the first descrambler is configured to scramble the data processing unit. The multimedia information or the scrambled multimedia information stored in the storage unit is descrambled.

The multimedia terminal further includes a smart card interface connected to the control unit for reading user information stored in the smart card, so that the control unit uses the read user information to perform corresponding arithmetic processing, and controls the first A descrambler performs descrambling processing on the scrambled multimedia information sent by the data processing unit or the scrambled multimedia information stored in the storage unit.

The multimedia terminal further includes:

A multimedia information input interface for reading multimedia information input by a multimedia information input device;

The encoding unit is respectively connected to the multimedia information input interface and the data processing unit, and is configured to perform encoding processing on the multimedia information read by the multimedia information input interface, and use the encoded multimedia information as upload information input by the multimedia terminal. Send to the data processing unit for data processing.

The encoding unit is further connected to the data processing unit through the storage unit, and the encoding unit stores the encoded multimedia information in the storage unit, so that the subsequent data processing unit reads the stored encoding in the storage unit. The multimedia information is processed or directly played by the multimedia terminal.

The multimedia terminal further includes a scrambler, and the encoding unit is further connected to the data processing unit through the scrambler, and the scrambler is configured to perform scrambling processing on multimedia information that has been encoded and processed by the encoding unit, and The scrambled multimedia information is sent as input information of the multimedia terminal to a data processing unit for data processing.

The multimedia terminal further includes:

Cable television network interface, connected to the cable television network, and used to receive radio frequency digital television signals from the cable television network;

A tuner connected to the cable television network interface and configured to send RF digital TV signals are tuned to IF digital TV signals;

A demodulator connected to the tuner and configured to demodulate the intermediate frequency digital television signal sent from the tuner into a transport stream mainly including digital audio signals and digital video signals; and

A demultiplexer, which is respectively connected to the demodulator and the decoding unit, and is configured to extract a transport stream of a program from the transport stream sent from the demodulator, and send the extracted transport stream to the decoding unit for decoding operation .

The multimedia terminal further includes a second descrambler, and the demultiplexer is further connected to the decoding unit through the second descrambler, and the second descrambler is used for scrambled transmission for the demultiplexer to extract programs After the stream is descrambled, it is sent to the decoding unit for decoding.

The data processing unit further includes:

An authentication subunit connected to the network interface unit and configured to perform a legality authentication operation on the data information sent by the network interface unit;

A data separation subunit, which is respectively connected to the authentication subunit and the decoding unit, and is configured to separate multimedia information and control information from the legal data information after the authentication subunit is authenticated; and

A data sending subunit, which is respectively connected to the control unit and the network interface unit, and is configured to process the uploaded information input by the multimedia terminal into data information conforming to a corresponding protocol of the data communication network, and then send the corresponding data communication through the network interface unit network.

The invention can achieve the following beneficial effects:

The multimedia terminal provided by the present invention can download multimedia information in advance when the data communication network cannot guarantee that each user has sufficient access bandwidth to receive data information, so that the user cannot continuously watch multimedia programs, and download the multimedia information in advance. The multimedia information is stored in the storage unit, so that the stored multimedia information can be read from the storage unit at a later time for non-real-time playback and viewing. Therefore, it can solve the problem that the data communication network cannot provide sufficient access bandwidth. Allows users to watch continuous program information.

The multimedia terminal of the present invention can descramble and watch the scrambled multimedia information by setting a first descrambler and a smart card interface, thereby improving the security of the multimedia information.

The multimedia terminal of the present invention further adds an authentication subunit to the data processing unit, which can Authenticate the data information sent by the data communication network, so as to ensure that users can only receive legal data information.

The multimedia terminal of the present invention is also provided with a multimedia information input interface and an encoding unit, which can encode and save multimedia information input by an external multimedia input device, so that subsequent multimedia terminals can directly decode and play the saved multimedia information for viewing or sending to data communication. network.

The multimedia terminal of the present invention can access the data communication network, and further adds a cable television network interface, a tuner, a demodulator and a demultiplexer, so that the television terminal can not only communicate with the data through the multimedia terminal of the present invention. The communication network performs interactive communication and can simultaneously receive digital television signals from the cable television network.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing the structure and composition of a first embodiment of a multimedia terminal according to the present invention;

FIG. 2 is a block diagram showing a structure of a second embodiment of a multimedia terminal according to the present invention; FIG.

Figure 3 is a block diagram showing the structure of a third embodiment of the multimedia terminal of the present invention;

Fig. 4 is a block diagram of the specific structural components inside the data processing unit in the multimedia terminal of the present invention; Fig. 5 is a diagram of the specific structural components inside the playback output unit of the multimedia terminal of the present invention; Fig. 6 is the multimedia terminal and the digital cable television network of the present invention. A block diagram of a simple network structure composed of a communication network;

FIG. 7 is a schematic diagram of a process of video communication between data terminals using a data communication network according to the present invention.

detailed description

1, this figure is a block diagram of a first embodiment of a multimedia terminal according to the present invention. The multimedia terminal in the figure mainly includes a network interface unit S1, a data processing unit S2, a first descrambler S3, a decoding unit S4, and a playback output unit S5. The control unit S7, the storage unit S8, the smart card interface S9, and the external control input unit S10; the functions of each unit and its connection relationship are as follows: The network interface unit S1 is connected to the data communication network and is used from the data communication network! ^ Data packet; The data communication network described herein may be an Internet network, an IP metropolitan area network, or the like. The network interface unit S1 corresponds to different data access modes, and different interface modules can be selected, such as an Ethernet card, an Asymmetric Digital Subscriber Line (ADSL) access card, and the like. The network interface unit SI has a transmission rate from 512Kbps according to different access methods. To 10Mbps. Communication between a multimedia terminal and an external data communication network is a two-way interactive process. The network interface unit S1 initiates a request to a server of the data communication network according to a user's operation control (such as downloading, video on demand, etc.); and receives data information sent by the server of the data communication network.

The data processing unit S2 is connected to the network interface unit S1 and is configured to process various input uploaded information of the multimedia terminal into data information conforming to a corresponding protocol of the data communication network, and then send the data information to the data communication network through the network interface unit S1. The input information of the multimedia terminal includes operation information input by a user and multimedia information input by using a multimedia information input device such as a camera and a microphone;

At the same time, the data processing unit S2 is also used to separate the multimedia information and the control information from the data information sent by the network interface unit S1. The data information returned from the data communication network generally includes multimedia information and control information. Among them, the multimedia information For the demand information requested by the user, the separated multimedia information can be further sent to the subsequent first descrambler S3 or sent to the storage unit S4; the control information mainly reflects the status of the data communication network, the server status, and whether the user operation is successful, etc. The data information is separated from the control information and forwarded to the control unit S7.

The control unit S7 is respectively connected to the network interface unit S1, the data processing unit S2, and each subsequent unit, and is configured to receive the control information sent by the data processing unit S2 and control the interaction between the various units. At the same time, the control unit S7 must also Real-time control of subsequent descrambling processes.

The first descrambler S3 is connected to the data processing unit S2, and is configured to perform descrambling processing on the scrambled multimedia information separated by the data processing unit S2 under the control of the control unit S7. Since the multimedia information sent from the data communication network may be scrambled multimedia information after being scrambled, or may be unscrambled multimedia information without being scrambled, when the multimedia information separated by the data processing unit S2 is When the multimedia information is scrambled, the first descrambler S3 needs to perform descrambling processing, and when the multimedia information separated by the data processing unit S2 is unscrambled multimedia information, the first descrambler S3 does not need to perform descrambling. Processing; instead, the subsequent decoding processing is performed directly.

The storage unit S8 is connected to the data processing unit S2 and is used to store the multimedia information separated by the data processing unit S2. Because in some cases, it may be There are too many users of the on-demand server in the information network, and each user accesses the on-demand server in the data communication network. The bandwidth of the on-demand server is too narrow, so that users cannot continuously watch high-speed and dynamically changing multimedia programs. In this case, The multimedia terminal of the present invention may further download and store the separated multimedia information into the storage unit S8 after the multimedia data received from the network interface unit S1 is separated and processed by the data processing unit S2, and then wait for the multimedia required by the user. After all the information is stored in the storage unit S8, subsequent operations are performed. If the stored multimedia information is scrambled multimedia information, the multimedia and body information stored in the storage unit S8 is sent to the first descrambler S3 for descrambling processing, and the multimedia information sent by the data communication network has not been scrambled. In the case of interference, it does not need to be sent to the first descrambler S3 for descrambling processing, but is directly sent to the decoding unit S4 for direct decoding processing. For example, this storage unit S8 may be a mobile storage medium such as a mobile hard disk or a magnetic disk, Fixed storage media such as magnetic tape.

The decoding unit S4 is connected to the first descrambler S3 or directly connected to the storage unit S8, and is configured to decode the multimedia information descrambled by the first descrambler S3, or read the storage unit S8 to download the stored multimedia in advance Information is decoded; if the multimedia information is unscrambled multimedia information, the first descrambler S3 will not perform any processing on the multimedia information separated by the data processing unit S2 or the multimedia information stored by the storage unit S8, but directly Decoding processing is performed by the decoding unit S4;

The playback output unit S5 is respectively connected to the decoding unit S4 and the television terminal S6, and is configured to perform all or part of the digital-to-analog conversion processing on the decoded multimedia information sent by the decoding unit S4, so as to convert it into analog or digital video. After the audio signal is sent to the TV terminal for playback;

The external control input unit S1 Q is connected to the control unit S7. The external control input unit S10 is mainly used to input the user's selection information or operation information to the control unit S7. The external control input unit S10 may be a commonly used infrared remote control, or a keyboard / mouse device, etc. The operation process is similar to the current TV program selection or computer information input process.

The smart card interface S9 is also connected to the control unit S7, and is used to read user information stored in the smart card (in general, in order to realize the viewing of scrambled multimedia information, the network side will request the user's on-demand programs according to the information of a user. Multimedia information is scrambled, so in On the multimedia terminal side, the scrambled multimedia information can be descrambled by recording these user information in a smart card held by the user, so that the control unit S7 uses the read user information to perform corresponding calculation processing, and through the calculation The processed data controls the first descrambler S 3 to perform descrambling processing on the scrambled multimedia information sent by the data processing unit S ² .

Referring to FIG. 2, this figure is a block diagram showing the structure and composition of a second embodiment of the multimedia terminal of the present invention. In this embodiment, on the basis of the above-mentioned first embodiment, a multimedia information input interface S13, a coding unit S12, and a scrambler S11 are further added, so that when the multimedia terminal can perform interactive communication with a data communication network, Furthermore, the multimedia information received by the multimedia terminal can be encoded into data information that complies with the corresponding protocol of the data communication network and sent to the data communication network, or can be stored for subsequent direct playback and viewing. The functions of the newly added units are: multimedia The information input interface S 1 3 is used to read the multimedia information input by the multimedia information input device S14. The multimedia information input device S14 can be an existing multimedia device such as a video camera, a camera, and a microphone. The multimedia information input interface S13 is an external device. A socket, which can be connected to multimedia information input devices S14 such as cameras, cameras, and microphones, for reading in the multimedia information collected by these multimedia information input devices S14;

The encoding unit S12 is respectively connected to the multimedia information input interface S13 and the data processing unit S2, and is configured to encode the multimedia information read by the multimedia information input interface S13, and use the encoded multimedia information as the multimedia terminal input. The uploaded information is sent to the data processing unit S 2 for data processing, and is processed into a data information format of a corresponding protocol, and then sent to the data communication network. Thereby, the interactive function of multimedia information between different multimedia terminals is realized.

Of course, the encoding unit S12 may further be connected to the data processing unit S2 through the scrambler S11, so that the multimedia information encoded by the encoding unit S12 is subjected to the scrambling processing of the scrambler S11 and then sent to the data processing. The unit S2 performs data information conversion processing of the corresponding protocol and sends it to the data communication network.

The encoding unit S12 may also be connected to the storage unit S8 at the same time, so that the multimedia information encoded by the encoding unit S12 is directly stored in the storage unit S8 for direct playback and viewing at a later time. The following is a process of a user using the multimedia terminal and a data communication network to perform two-way interactive communication. Referring to FIG. 7, this figure is a schematic diagram of a process of video communication between multimedia terminals of the present invention using a data communication network. Specific processing The process is as follows,

A side (sender):

1) The cameras 260 are respectively connected to the multimedia information input interface S 13 of the multimedia terminal 220;

2) The multimedia information input interface S13 sends the received multimedia information such as multimedia images and audio data to the coding unit S4;

3) the encoding unit S4 compresses and encodes multimedia information such as multimedia images and audio information in a fixed format (such as MPEG1, 2, 4 and other encoding formats), and sends the compressed multimedia information to the scrambler S11;

4) If the user wishes to protect the private data information, the scrambler S11 will perform a scrambling operation to generate the scrambled multimedia information and key information respectively, and then send them to the data processing unit S2; if the user does not require the Data information is protected, the scrambler S11 performs a no-operation, and directly sends the compressed multimedia information to the data processing unit S2;

5) The data processing unit S2 processes the received multimedia information, converts it into a data information format conforming to the corresponding communication protocol of the data communication network, and sends it to the network end through the network interface unit S1.

B-side (receiver)

6) The network interface unit S1 of the receiving-end multimedia terminal receives the data information sent by the A-side user from the data communication network, and sends it to the data processing unit S2;

7) The data processing unit S2 separates the multimedia information in the data information and sends it to the first descrambler S3;

8) The first descrambler S3 first judges the received multimedia information, and if it is found that the multimedia information has been scrambled, it performs corresponding descrambling processing; if it is found that the multimedia information has not been scrambled, the first The descrambler S3 performs a null operation; the first descrambler S3 sends the processed multimedia information to the decoding unit S4;

9) The decoding unit S4 performs a decoding operation on the received multimedia information, and sends the generated digital audio and video information to the playback output unit S5;

10) the playback output unit S5 performs corresponding digital-to-analog conversion processing on the audio and video signals, Play it on a TV terminal.

Similarly, if the roles of A and B are switched, even if A is the receiving end and B is the sending end, the working process is as described above. If both ends of A and B work in duplex mode, both ends can be realized. User's multimedia session service.

Referring to FIG. 3, which is a block diagram showing the structure and composition of a third embodiment of a multimedia terminal according to the present invention. This embodiment is based on the first embodiment, and further adds a cable television network interface S15, a tuner S16, and a demodulator S17. The demultiplexer S18 and the second descrambler S19, so as to realize that the multimedia terminal of the present invention can receive digital television signals sent from the cable television network on the basis of interactive communication with the data communication network, and each unit thereof The specific functions are as follows: The cable television network interface S15 is connected to the cable television network and used to receive radio frequency digital television signals from the cable television network. In the multimedia terminal of the present invention, it is an external interface;

The tuner S16 is connected to the cable television network interface S15, and is configured to convert the radio frequency digital television signal sent from the cable television network interface into an intermediate frequency digital television signal;

The demodulator S17 is connected to the tuner S16 and is used for demodulating the intermediate frequency digital television signal sent from the tuner S16 into a transport stream mainly including digital audio signals and digital video signals; and

The demultiplexer S18 is respectively connected to the demodulator S17 and the decoding unit S4, and is configured to extract a transport stream of a program from the transport stream sent from the demodulator S17, and send the transport stream of the extracted program to the decoding unit S4. Perform decoding operations;

Of course, the demultiplexer S18 can be further connected to the decoding unit S4 through the second descrambler S19, because the TV signal transmission stream sent by the cable television network is also divided into two types: scrambled transport stream and unscrambled transport stream. In some cases, when a scrambled television signal transport stream is received, the second scrambler S19 is used to descramble the received scrambled transport stream and then sent to the decoding unit S4 for decoding processing. When the television signal transport stream is scrambled, it is not necessary to use the second descrambler S19 to perform descrambling processing on the received unscrambled transport stream, but directly to the decoding unit S4 for decoding processing.

Referring to FIG. 6, this figure is a simple block diagram of the network structure of the multimedia terminal, cable television network, and data communication network of the present invention. As can be seen from the figure, the multimedia terminal 220 of the present invention can receive the broadcast television center 200 by accessing the cable television network 210 The distributed digital television program signal is further processed and sent to the television terminal S6 for playback. Meanwhile, the multimedia terminal of the present invention 220 can also access the data communication network 250, and then perform interactive communication with the multimedia server 240, and request some TV program information according to the user's request, and then the multimedia terminal 220 processes the on-demand TV program information in the TV terminal. Play on S6. 4, this figure is a block diagram of the specific internal structure of the data processing unit in the multimedia terminal of the present invention. The data processing unit S2 mainly includes: an authentication subunit S200, a data separation subunit S210 and a data sending subunit S220, and each subunit The specific role is as follows:

The data sending sub-unit S220 is connected to the network interface unit S1, the control unit S7, the encoding unit S12, and the storage unit S8 at the same time, and is used to correspondingly process the upload information input by the multimedia terminal generated by the control unit through the encoding unit S12 to the data communication network After the data format of the protocol is sent, it is sent to the corresponding data communication network through the network interface unit S1. At the same time, it is also used to convert the uploaded multimedia information stored in the storage unit S8 after the encoding process into the data format of the corresponding protocol and then through the network interface The unit S1 is sent to the corresponding data communication network; it is also used to perform protocol conversion processing on the upload information input by the external control input unit S10, and then send it to the corresponding data communication network through the network interface unit S1.

The authentication subunit S200 is connected to the network interface unit S1, the control unit S7, and the data separation subunit S210, respectively, and is configured to control the data sent from the data communication network received by the network interface unit S1 under the control of the control unit S7. Information for authentication analysis.

The specific authentication process is:

1. The authentication subunit S200 receives the data information sent by the network interface unit S1; 2. The control unit S7 reads the authentication information in the smart card and sends it to the authentication subunit

S200;

3. The authentication subunit S200 performs an authentication operation on the data information received from the data communication network according to the authentication information provided by the smart card to determine the validity of the data information. If the data information is valid, the authentication subunit S200 sends the data information to the data separation subunit S210; if the data information is invalid, the authentication subunit S200 discards the data information and sends an error prompt message to the control unit S7.

The data separation subunit S210 is respectively connected to the authentication subunit S200 and the storage unit S8, or to the first descrambler S3, and is configured to classify and forward the data information returned by the data communication network. The data information returned by the data communication network is generally composed of two parts: multimedia information and control information. The multimedia information is data information required by the user. After distinguishing the multimedia information, the data separation sub-unit SO will forward the multimedia information to the first one according to whether the multimedia terminal is in a real-time on-demand or non-real-time downloading operation state. The descrambler S3 performs descrambling operation or forwards it to the storage unit S8 for pre-downloading and storing. The control information mainly reflects data information such as the network status, server status, and whether the user operation is successful. After the data separation module distinguishes the control information, it will It is forwarded to the control unit S7.

Referring to FIG. 5, this figure is a block diagram of specific modules inside a playback output unit in a multimedia terminal according to the present invention. As shown in the figure, the playback output unit S5 is under the control of the control unit S7, and is respectively connected to the audio interface of the decoding unit S4 and the television terminal and The video interface connection is used to perform digital-to-analog conversion processing on the digital audio and digital video information decoded by the decoding unit S4, so that it can be output to the audio interface and video interface of the analog television terminal or digital television terminal, respectively. The output unit S5 further includes an audio digital-to-analog conversion sub-unit S50 and a video digital-to-analog conversion sub-unit S51. The specific functions of each component are as follows:

After the playback output unit S5 receives the decoded digital audio signals and digital video signals from the decoding unit S4, the television terminal connected to the multimedia terminal of the present invention can be a common analog television terminal or a digital television terminal, and the analog Video and audio interfaces are provided on both the TV terminal and the digital TV terminal.

For an analog TV terminal, the playback output unit S5 needs to convert the digital audio signal into an analog audio signal that can be received by the analog TV terminal through the audio digital-to-analog conversion sub-unit S50 before sending it to the audio interface of the analog TV terminal for playback; At the same time, the video digital-to-analog conversion subunit S51 needs to be converted into an analog video signal that can be received by an analog television terminal before it can be sent to the video interface of the analog television terminal for playback, that is, the video digital-to-analog conversion subunit S51 After the conversion process, the digital video signal is converted into a line and field scan analog signal for playback by an analog television terminal.

For a digital TV terminal, the playback output unit S5 can directly send digital audio signals to the audio interface of the digital TV terminal without having to go through the conversion processing of the audio digital-to-analog conversion sub-unit S50; when processing digital video signals, it also passes The digital-to-analog conversion process of the video digital-to-analog conversion subunit S51 converts digital video signals into line and field scan analog signals for digital television terminals to play. Of course, the multimedia terminal of the present invention can also perform any combination of the embodiments on the basis of the above-mentioned embodiments to achieve different purposes.

What has been described above are only preferred embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

Rights request

1. A multimedia terminal for connecting a television terminal to a data communication network, characterized in that it includes:

The external control input unit is connected to the control unit and is configured to input user operation information to the control unit, so that the control unit converts the operation information input by the user into upload information input by the multimedia terminal.

2. The multimedia terminal according to claim 1, further comprising a first descrambler, wherein the data processing unit and the storage unit are further connected through the first descrambler and a decoding unit, and the first descrambler The scrambler is configured to perform descrambling processing on the scrambled multimedia information separated by the data processing unit or the scrambled multimedia information stored in the storage unit. .

3. The multimedia terminal according to claim 2, further comprising: The smart card interface connected to the control unit is configured to read user information stored in the smart card, so that the control unit uses the read user information to perform corresponding operation processing, and controls the first descrambler to process data through the operation processed data. The descrambling multimedia information sent by the processing unit or the scrambled multimedia information stored in the storage unit is descrambled.

4. The multimedia terminal according to claim 1, further comprising: a multimedia information input interface for reading multimedia information input by the multimedia information input device;

5. The multimedia terminal according to claim 4, wherein the encoding unit is further connected to the data processing unit through the storage unit, and the encoding unit stores the multimedia information after encoding processing in the storage unit, so that The subsequent data processing unit then reads and stores the encoded multimedia information in the storage unit for processing or direct playback by the multimedia terminal.

6. The multimedia terminal according to claim 4, further comprising a scrambler, wherein the encoding unit is further connected to the data processing unit through the scrambler, and the scrambler is configured to encode and process the encoded unit. The scrambled multimedia information is scrambled, and the scrambled multimedia information is sent as input information of the multimedia terminal to a data processing unit for data processing.

7. The multimedia terminal according to claim 1, further comprising: a cable television network interface connected to the cable television network for receiving radio frequency digital television signals transmitted from the cable television network;

A tuner connected to the cable television network interface for tuning a radio frequency digital television signal sent from the cable television network interface into an intermediate frequency digital television signal;

A demodulator connected to the tuner and configured to demodulate the intermediate frequency digital television signal sent from the tuner into a transport stream mainly including digital audio signals and digital video signals; and A demultiplexer, which is respectively connected to the demodulator and the decoding unit, and is configured to extract a transport stream of a program from the transport stream sent from the demodulator, and send the extracted transport stream to the decoding unit for decoding operation .

8. The multimedia terminal according to claim 7, further comprising a second descrambler, wherein the demultiplexer is further connected to the decoding unit through the second descrambler, and the second descrambler is used for After descrambling the scrambled transport stream extracted by the demultiplexer, the program is sent to the decoding unit for decoding.

9. The multimedia terminal according to claim 1, wherein the data processing unit further comprises:

A data sending subunit, which is respectively connected to the control unit and the network interface unit, and is configured to process the uploaded information input by the multimedia terminal into data information conforming to a corresponding protocol of the data communication network and then send the corresponding data communication through the network interface unit network.

10. The multimedia terminal according to claim 1, wherein the television terminal is a digital television terminal or an analog television terminal.

11. The multimedia terminal according to claim 10, wherein the playback output unit further comprises:

A video digital-to-analog converter, which is respectively connected to the decoding unit and the television terminal, and is configured to convert the decoded digital video signal sent by the decoding unit into an analog video signal, and send it to the television terminal for playing; and

An audio digital-to-analog converter is connected to the decoding unit and the analog television terminal, respectively, and is configured to convert the decoded digital audio signal sent from the decoding unit into an analog audio signal and send it to the analog television terminal for playback.

12. The multimedia terminal according to claim 1, wherein the external control The control input unit is an infrared remote control or a keyboard / mouse device.

13. The multimedia terminal according to claim 1, wherein the storage unit is a fixed storage medium and / or a mobile storage medium.