KR20000066843A - Method for recording the digital data stream selectively - Google Patents

Abstract

PURPOSE: A selective recording method of a digital datastream selects only a datastream having the requested attribute, and records it on an optical recording medium. CONSTITUTION: A method for recording an input digital stream on a recording medium comprises the steps of: identifying a selective recording request in accordance with an attribute of the input digital stream; and extracting and recording the datastream having the selected attribute from the input digital stream. The step further comprises recording an information about the attribute of the selected and recorded digital stream. A system for applying the method comprises a set top box, a communication interface(IEEE1394), and a streamer. The set top box receives a transport stream with a plurality of broadcast program coded by a system encoder multiplexed from a broadcasting station, and reversely multiplexes the transport stream.

Description

Method for recording the digital data stream selectively}

The present invention relates to a recording method of a digital stream, and more particularly, to a selective recording method of a digital data stream for selecting and extracting only a data stream having a selected attribute from a transmitted digital broadcasting stream and recording the same on a recording medium. will be.

In the conventional analog television broadcasting, a video signal to be transmitted is modulated by AM or FM and transmitted through radio waves or cables. Recently, with the development of digital technologies such as digital image compression and digital modulation and demodulation, the standardization of digital television broadcasting is rapidly progressing, and existing terrestrial, satellite, and cable broadcasting are based on MPEG (Moving Picture Experts Group) method. It is digitizing.

According to the development of digital video / audio compression technology and digital transmission technology, the digital broadcasting can provide a higher quality service than the analog service, and can transmit a plurality of broadcast programs in the same bandwidth, and use digital communication media and digital storage media. Has the advantage of increasing interoperability.

In such digital broadcasting, a plurality of broadcast programs encoded on the basis of the MPEG scheme are multiplexed and transmitted in a transport stream (TS), which is received by a set top box installed on the receiving side. The multiple broadcast programs included in the transport stream are demultiplexed so that only one desired broadcast program is selected, and the original audio and video signal is decoded by a decoder built into the set-top box for the selected broadcast program. To the same A / V output device.

As described above, researches on a system for receiving a digital broadcast signal and outputting it to an A / V output device such as a television, as well as storing, editing, and playing the received broadcast signal in a storage medium, After receiving a digital data stream such as a digital broadcast signal from a set-top box, and storing it in a streamer such as a digital video disc (DVD) recording / reproducing apparatus through a communication interface such as an IEEE1394 serial bus, the stored digital Research on a system capable of reproducing digital audio and video through an AV output device such as a television by editing and reproducing a data stream and delivering the communication interface to a set-top box is being conducted. The streamer converts the received digital broadcast data into a recording format. And, to generate control information necessary for reproduction and the same time adopting a method of recording the disc recording medium.

However, a DVD-RAM used as a recording medium in a streamer has a limited recording capacity, and therefore, it is not only possible to record a long time of moving image data, but also in some cases, to use the recording medium. Therefore, video or audio is unnecessarily recorded.

In other words, when recording a broadcast program and reproducing it for music or painting in a passenger car, the recorded image becomes unnecessary, which causes a problem that the limited recording medium cannot be efficiently used.

Accordingly, the present invention has been made in view of the above circumstances, and provides a selective recording method of a digital data stream which can select and record only a data stream having a requested attribute among the transmitted digital data streams on an optical recording medium. The purpose is to provide.

1 illustrates a configuration of a received digital broadcast program stream.

FIG. 2 shows the format of moving picture recording stream stream information M_VOB_STI recorded on a specific area of an optical recording medium;

3 schematically illustrates a system to which a selective recording method of a digital data stream according to the present invention is applied,

Fig. 4 shows the flow of a preferred embodiment of the selective recording method of a digital data stream according to the present invention.

FIG. 5 shows a format of information indicating whether data (video, audio, data) streams selectively recorded according to a user's recording request are recorded.

6 shows a format of information indicating whether or not an audio stream is selectively recorded according to a user's recording request.

FIG. 7 illustrates a detailed format of program play connection (PGC) program information including reproduction order information (Cell) in which information as shown in FIG. 6 is recorded.

※ Explanation of code for main part of drawing

100: set-top box 110: station selection processing unit

120: decoder 130210: communication interface

140,250: control unit 150,260: memory

200: streamer 220: storage stream processing unit

230: optical recording medium (DVD) 240: read stream processing unit

According to an aspect of the present invention, there is provided a method of selectively recording a digital data stream, the method including: identifying a selective recording request according to an attribute of the digital stream; And a second step of extracting and recording the data stream having the selected attribute from the digital stream.

Hereinafter, preferred embodiments of the selective recording method of a digital data stream according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 schematically shows an embodiment of a system to which the selective recording method of a digital data stream according to the present invention can be applied, the system comprising: a set-top box 100, a communication interface (IEEE 1394) and a streamer; 200).

The set-top box 100 of the system configured as described above receives a transport stream (TS) multiplexed with a plurality of broadcast programs encoded by a system encoder from a broadcasting station and demultiplexes it. In accordance with this, the control unit (MCU) 140 decodes the transport stream for the broadcast program tuned by the channel selection unit 110 by the system decoder 120 and outputs it through an AV set such as a television.

In the set-top box 100, the decoder 120 decodes the broadcast program service information included in the transport stream for the broadcast program tuned by the channel selection processing unit 110 and transmits it to the control unit 140 by decoding the broadcast program service information. 140 stores the broadcast program service information in the broadcast program information area M1 of the memory 150. The broadcast program service information may include broadcast program information of all broadcast programs of all received channels. In the broadcast program service information (SI), a transmission channel number, a channel name, a broadcast program name, a schedule, each Program category information of a broadcast program, attribute information of streams constituting each broadcast program, and a viewing grade of each broadcast program may be included.

The control unit 140 of the set-top box 100 forms a broadcast program table having a time axis and a channel axis by using broadcast program service information stored in the broadcast program information area M1 of the memory 150 at the request of a user. Control to display on the screen.

The set-top box 100 transmits the broadcast program tuned at the request of the user to the streamer 200 via the IEEE1394 communication interface 130 or 210, and transmits the broadcast program by the streamer 200 to the digital video disc. Recording on an optical recording medium 230 such as a DVD.

In addition, the set-top box 100 receives a broadcast program read from the optical recording medium 230 by the streamer 200 through the IEEE1394 communication interface 210 or 130 at the request of the user, and then the decoder 120 receives the broadcast program. By decoding and outputting to a television set, a broadcast program can be reproduced.

As described above, the set-top box 100 and the streamer 200 need to know management control information of the broadcast programs recorded on the optical recording medium in order to play respective roles in recording and reproducing broadcast programs. Therefore, in the above system, "application management information" which is recording broadcast program management control information used only by the set-top box 100, "streamer management information" which is recording broadcast program management control information used only by the streamer 200, And dividing it into "common management information" which is recording and broadcasting program management control information which can be shared by the set-top box 100 and the streamer 200, and is used to manage broadcast programs recorded on an optical recording medium. These files are recorded on the optical record carrier 230 of the streamer 200.

On the other hand, application management information, streamer management information, and common management information, which are management control information of broadcast programs recorded on the optical recording medium, are divided into individual files and stored on the optical recording medium, or It may be stored in three divided areas ("application management information area", "streamer management information area", and "common management information area") in the file.

The application management information is read by the read stream processor 240 of the streamer 200 at the time of initial operation of the set-top box 100 or at the request of the set-top box, and is transmitted to the set-top box 100 via the IEEE 1394 communication interface. Management information about the broadcast program that is transmitted and stored in the management information area M2 of the memory 150 by the control unit 140 of the set-top box 100, and then newly recorded when the broadcast program is recorded by a user request. It is added by the controller 140 and updated. In addition, when the recorded broadcast program is reproduced by a user request, the controller 140 makes a request for playback to the streamer 200 using management information of application management information. The application management information stored in the memory 150 is read at the end of the recording operation or the power-off operation of the set-top box and transmitted to the streamer 200 via a communication interface to control the control unit 250 of the streamer 200. According to the control, the data is recorded on the optical recording medium 230 by the storage stream processor 220.

The streamer management information and the common management information are read by the read stream processing unit 240 of the set-top box 200 when the streamer 200 is initially driven, and the memory is controlled by the controller 250 of the streamer 200. The management information for the newly recorded broadcast program at the time of recording the broadcast program by the user request after being stored at 260 is added by the controller 250 and updated and recorded. In addition, when the recording broadcast program is reproduced at the user's request, the control unit 250 is stored in the optical recording medium 230 by using the management information of the streamer management information according to the reproduction request signal from the set-top box 100. Playback of the broadcast program is performed. The streamer management information and the common management information stored in the memory 260 are read out at the end of the write operation or the power-off operation of the streamer 200, and are read to the storage stream processor 220 under the control of the controller 250. Is recorded on the optical record carrier 230.

FIG. 4 shows the flow of a preferred embodiment of the selective recording method of the digital data stream according to the present invention. Hereinafter, the selective recording method of FIG. 4 according to the present invention will be described in detail with reference to FIG.

First, when a user request to record a digital data stream, such as a digital broadcast signal input and tuned by the channel selection processing unit 110, on an optical recording medium is input, the control unit 140 of the set-top box 100 is an IEEE1394 communication interface (130,210). By notifying the control unit 250 of the streamer 200 that the current recording mode is set, and transmitting the received data stream to the streamer 200 through the communication interfaces 130 and 210, The data is recorded on the optical recording medium 230 in the streamer 200.

In addition, the control unit 140 of the set-top box 100 may include a program association table (PAT), a program correspondence table (PMT), a network information table (NIT), and a conditional reception table (CAT). Program configuration information (PSI) consisting of four tables, which are Conditional Access Tables, is recorded on the application management information or common management information. In the program correspondence table (PMT), a transmission packet of the broadcast program stream is a PID. For example, if the value of the packet identification information (PID) is 'XV', the attribute of the data stream is video, and the value of the packet identification information (PID) is 'XA'. Indicates that the attribute of the data stream is audio, and if the value of the packet identification information (PID) is 'XD', the attribute of the data stream is data, and If the value of the identification information (PID) of 'XC' has is that each exhibit the properties of the data stream, the data clock.

In this state, in recording the digital broadcast program transmitted as described above on the optical recording medium 230, a user reproduces and uses the optical recording medium 230 on which the digital broadcast program is to be recorded through a portable player. In the case of requesting to record only the audio stream among the data streams constituting the digital broadcast program (S10), the streamer 200, the control unit 250 configures each of the digital broadcast programs to be transmitted. Among the data streams, only an audio stream excluding video and a data stream is recorded on the optical recording medium 230. To this end, the streamer 200 controller 250 controls the optical recording medium 230 on the optical recording medium 230. The program correspondence table (PMT) is detected from the application management information or the common management information recorded by the set-top box 100, and the contents of each data stream. And PID is determined (S11). For example, if the transmitted broadcast program has a unique number '10', it can be seen that the PID of the audio stream of the broadcast program is '101' in the program correspondence table (PMT), and the PID of the video stream is '102'. It can be seen from the above that the program 10 is composed of one audio and one video stream. That is, all the transmission packets constituting Program 10 can be found using the PID value.

Therefore, the streamer 200 controller 250 determines that the PID of the audio stream recorded from the user is 101, and from this, the transport packet including '101' as the PID value in the transmitted transport packet. A setting request is made to the storage stream processor 220 to detect and record the data (S12).

Accordingly, the storage stream processing unit 220 detects only the transmission packet including '101' as the PID value, and records it on the optical recording medium 230 in the streamer 200.

At the same time, the streamer 200 controller 250 configures 'Type of Stream' information indicating whether each digital data stream is recorded on the optical recording medium 230 in the form shown in FIG. Since only the stream whose stream attribute is audio is selected and recorded according to the request of, the information representing the recording of the audio stream is composed of a value of '010 ₍₂₎ ' as shown in FIG. 6, as shown in FIG. The recording data is inserted and recorded in a specific field (Type of Stream) of the reproduction order information (Cell) of the recording data stream (S14).

By repeating the above operation until the recording mode is terminated by the user (S20), only the audio stream of each data stream constituting the transmitted digital broadcast program is recorded on the optical recording medium 230. When the recording end request is received by the user, the recording operation is terminated.

On the other hand, when the user is recording on the optical recording medium 230 of the digital broadcast program to be transmitted, to use the optical recording medium 230 on which the digital broadcast program is to be recorded for language learning, In case of requesting to record an audio stream and a data (for example, sub-picture data) stream except for the video stream, the streamer 200 controller 250 performs the same process as described above. After that, only the audio stream and the data stream are recorded on the optical recording medium 230, and together with the 'Type of Stream' information indicating the recording of the audio stream and the data stream, as described above, '00000110 ₍₂₎ To be inserted and recorded in a predetermined field (Type of Stream) of reproduction order information (Cell).

In the above-described embodiment, as well as any one of each data stream constituting the digital broadcast program is selected. Selective recording of selected data streams is possible.

In addition, the present invention is not limited to the system described with reference to FIG. A digital broadcasting program is also provided in a system configured to perform a function such as the set-top box and a device that perform a function such as the streamer in a set, and to communicate with each other via an internal bus. The present invention can also be applied when receiving and storing.

In the selective recording method of the digital data stream according to the present invention as described above, only the data stream having the attribute requested by the user can be selectively recorded among the respective data streams constituting the transmitted digital broadcast program. Since only desired data can be selectively recorded on a recording medium having a capacity, only data of a desired attribute can be recorded over a longer period of time, which is a very useful invention that can use the recording medium more efficiently.

Claims (2)

In the method for recording the input digital stream on the recording medium, A first step of confirming a selective recording request according to the attribute of the digital stream; And And a second step of extracting and recording a data stream having the selected attribute from the digital stream. The method of claim 1, The second step further comprises the step of additionally recording information on the attribute of the selectively recorded digital stream.