KR100538856B1 - Digital data stream recording and mapping information generation / recording method accordingly - Google Patents

Abstract

The present invention divides a received digital data stream, in particular, a data stream transmitted at a low speed, into a recording unit by dividing the data stream on a recording medium into a predetermined recording size or a predetermined recording time, and generates attribute information for identifying the attributes of the recording unit. Or selecting and recording digital data streams recorded on a recording medium together with mapping information for searching and managing the recording unit, and a method of generating / recording the mapping information. The received digital data stream is divided into recording units and recorded. Step 1 to do; Generating mapping information of the partitioned recording unit and attributes of the mapping information; And determining the attribute of the generated mapping information and recording the same with the mapping information. The received digital data stream, in particular, the digital data stream received at a low transmission rate, has a predetermined recording size or a predetermined recording time. The recording unit is partitioned / recorded, and the attribute information for identifying the attribute of the recording unit is generated or selected, and recorded together with the mapping information for searching and managing the recording unit, thereby enabling the low speed transmission of the digital data stream. This prevents the recording unit from exceeding the recording unit time or the recording unit size, and also makes it possible to use the recording area of the recording medium more efficiently.

Description

Digital data stream recording and mapping information generation / recording method accordingly

The present invention divides a received digital data stream, in particular, a data stream transmitted at a low speed, into a recording unit by dividing the data stream on a recording medium into a predetermined recording size or a predetermined recording time, and generates attribute information for identifying the attributes of the recording unit. Or a digital data stream recording method for selecting and recording on a recording medium together with mapping information for searching for and managing the recording unit.

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 advancing at a rapid pace, and digitalization based on MPEG (Moving Picture Experts Group) is also used in conventional terrestrial, satellite, and cable broadcasting. Doing.

According to the development of digital video / audio compression technology and digital transmission technology, the digital broadcasting can provide higher quality service than 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 MPEG are multiplexed and transmitted in the form of a transport stream (TS), which is received by a set top box or the like installed on the receiving side. A plurality of broadcast programs included in the transport stream are demultiplexed so that only one desired broadcast program is selected. The selected broadcast program is decoded by a decoder built into the set-top box to decode the original audio and video signal such as a television. It is delivered to A / V output device.

FIG. 1 schematically illustrates a conventional digital data stream recording system. The system includes a set top box 100, a communication interface (IEEE 1394), and a streamer 200. The set top box 100 Receives and demultiplexes a transport stream (TS) multiplexed by a system encoder multiplexed by a system encoder from a broadcasting station, and tunes in the channel selection unit 110 by the control unit 140 at the user's request. The stream stream for the broadcast program is decoded by the system decoder 120 to be output through an AV set such as a television, or the broadcaster tuned at the request of the user through the IEEE 1394 communication interface 130 or 210 as a streamer 200. To record the broadcast program to a recording medium 230 such as a digital video disc (DVD). have.

In addition, the set-top box 100 receives a broadcast program read from the recording medium 230 by the streamer 200 in response to a user's request via the IEEE1394 communication interface 210 or 130 and decodes it in the decoder 120. The broadcast program can be reproduced by outputting to a television set.

As described above, the system for receiving digital broadcast signals and outputting them to an A / V output device such as a television, as well as storing, editing, and playing the received broadcast signals on a storage medium is currently under development. The recording unit segmentation method is still standardized on how to partition and record a stream recording unit (SOBU, or Mapping Unit: MABU, hereinafter referred to as SOBU) which is a minimum recording unit for a digital data stream on a recording medium. Since they are not in the state, methods that have been independently researched and developed for the method of partitioning the recording unit (SOBU) are being proposed one after another by related companies.

Hereinafter, the method of dividing the recording unit proposed by the relevant companies will be briefly described.

First, FIG. 2A illustrates the proposed SOBU partitioning method (hereinafter, referred to as A method). The method A includes a method for receiving a received data stream at a predetermined time interval (e.g., X = 20 ms), and the amount of data streams recorded during a predetermined time, that is, the number of sectors to be recorded is included in the reference sector number range (for example, 26 to 38 sectors) having a predetermined range (for example, N = 6). When the time coincides with an integer multiple of a predetermined time interval (aX: a = integer), the sectors recorded up to that time are divided into one recording unit SOBU, and mapping information for searching and managing the divided recording units (MAPL) This is a method of creating a mapping list and recording it on a recording medium.

In addition, FIG. 2B illustrates another proposed SOBU partitioning method (hereinafter referred to as B method), wherein the B method performs a predetermined time interval (eg, X) on a received data stream. = 25.1 ms), and when the amount of data streams recorded during a predetermined time, that is, the number of sectors to be recorded, reaches a certain number of sectors (eg, 32 sectors), the sectors recorded up to that time are divided into one recording unit SOBU. And generating mapping information (MAPL: Mapping List) for searching and managing the partitioned recording units and recording them on the recording medium. For reference, the constant time interval X in the method B is variable to a value while a certain number of sectors (for example, 32 sectors) is recorded.

On the other hand, the method A can partition / record the normal recording unit with respect to the data stream received at a transmission rate of 5.8 Kbps to 13.1 Mbps, and the method B can receive data at a transmission rate of 2.8 Kbps to 11 Mbps. Normal recording units can be partitioned / recorded with respect to.

However, the data stream transmission rate of the recently proposed digital broadcasting system (DBS) is a low transmission rate corresponding to a minimum of 2.4 kbps for a synchronous signal and a minimum of 1.9 kbps for an asynchronous signal. Therefore, there is a problem that the normal recording unit division / recording becomes impossible with the A and B methods.

Accordingly, in order to solve the above problem, the method of partitioning a recording unit (SOBU), which has been recently proposed again (hereinafter, referred to as the C method) will be described with reference to FIG.

First, the description of the method C will be described with reference to solving the problem occurring in the method B as an embodiment. As described above, the data stream transmission rate of the digital broadcasting system (DBS) is a synchronous signal. In case of asynchronous signal, it is a low speed transfer rate corresponding to a minimum of 1.9kbps. Therefore, a predetermined time that can count the received data stream at regular intervals (for example, X = 25.1ms). For example, the number of write sectors, which is the amount of data streams recorded during the maximum time that can be counted to 12 bits, becomes considerably less, e.g., if the number of sectors recorded for the maximum time that counted to 12 bits is only 4 sectors, B In order to fit 32 sectors, which is the number of reference sectors of the recording unit defined in the method, 28 sectors are padded with unnecessary data, thereby providing a size having a size of 32 sectors. It proposes to divide the record units.

In the case of the method A as well, the insufficient number of sectors is padded with unnecessary data as described above to restrict the recording units having the normal recording size (26 to 38 sectors) defined by the method A.

However, in the case of the proposed method C, as shown in Fig. 2C, an unnecessary data area, that is, a padding area that has been padded, is continuously recorded on the recording medium. There is a problem that results in using the recording area of the recording medium extremely inefficiently.

Accordingly, the present invention was created to solve the above problems, and divides the received digital data stream into a recording unit by dividing the received digital data stream into a predetermined recording size or a predetermined recording time on a recording medium, and identifies the attributes of the recording unit. By generating or selecting attribute information for recording, and recording with the mapping information (MAPL) for searching and managing the recording unit, intermittent continuous padding on the recording medium due to the data stream received at a low transmission rate. It is an object of the present invention to provide a digital data stream recording and a mapping information generation / recording method for preventing generation of a padding area to be processed.

Digital data stream recording and mapping information generation / recording method according to the present invention for achieving the above object comprises the steps of partitioning and recording the received digital data stream into a recording unit; Generating mapping information of the partitioned recording unit and attributes of the mapping information; And determining the attribute of the generated mapping information and recording it together with the mapping information.

In addition, the digital data stream recording and mapping information generation / recording method according to the present invention comprises the steps of: recording the received digital data stream on a recording medium for a predetermined time; Dividing the data stream recorded in the predetermined time into recording units; And determining a recording type of the size information according to the size of the partitioned recording unit.

In addition, the digital data stream recording and the mapping information generation / recording method according to the present invention comprises the steps of: recording the received digital data stream on a recording medium for a predetermined time; Dividing the recorded data stream of a predetermined size into recording units; And determining a recording type of time interval information according to the time interval of the partitioned recording unit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, preferred embodiments of a digital data stream recording and mapping information generation / recording method according to the present invention will be described in detail with reference to the accompanying drawings.

3A and 3B show an operation flowchart of the first embodiment of the digital data stream recording and the mapping information generation / recording method according to the present invention, and the method A described with reference to FIG. The operation flowchart for the recording unit partition and mapping information generation / recording method according to the present invention, which is applied to.

First, the control unit 250 of the streamer 200 shown in FIG. 1 sets a recording mode to record a data stream received from the set-top box 100 on a recording medium such as a DVD (S10). The data stream is recorded on the recording medium (S11), and the amount of the recorded data stream, that is, the number of sectors and the recording time of the data stream are counted as 20ms (S12). Then, when 1/2 of the maximum count time that can be counted to 12 bits has elapsed, the recording state detection (S13) operation for detecting the number of sectors recorded so far is performed, and the detected number of sectors is the minimum sector defined by the method A. In other words, it is detected whether the number is 13 sectors or 13 sectors or more, which is 1/2 of 26 sectors, and whether the recording state is normal is determined (S14).

As a result of the determination, in the normal recording state (over 13 sectors of abnormal recording), after the recording operation is continued, a time point (aX: a = integer) that is an integer multiple of 20 ms (X) and the recorded data stream are 26 to 38 sectors. The value included in the sector is detected (S15), and one recording unit SOBU is partitioned (S16).

On the other hand, if the determination result (S14) is not in the normal recording state (less than 13 sectors), if the number of sectors recorded so far is less than 8 sectors is again determined (S22), the recording operation is continued as described above. When the counted time TC reaches the maximum count time TCs that can be counted as 12 bits (S23), the data stream recorded so far, that is, the data stream not exceeding at least 15 sectors, is recorded in one recording unit ( SOBU) and the determination result (S14, S22), and if the number of sectors recorded so far is not more than 13 sectors or less than 8 sectors, the recording operation continues to be 15 sectors. The value is detected (S24), and the data stream, i.e., 15 sectors recorded up to this point, is divided into one recording unit SOBU (S24).

Thereafter, the recording size of the partitioned recording unit, that is, the number of sectors is detected (S17), wherein the number of sectors detected is the number of sectors corresponding to one of 26 to 38 sectors or 15 sectors or less through the series of processes. Will be. On the other hand, if the detected number of sectors corresponds to 26 to 38 sectors (S18), the difference between the flag 0 and the reference sector number (32 sectors) of the recording unit is set to attribute information indicating that the recording unit is divided into normal. If it is generated as a value (S19) and the number of sectors detected is equal to or less than 15 sectors (S18), attribute information indicating that the recording unit is divided abnormally is set to flag 1 and the actual size of the recording unit (actually recorded sectors). And recording (S21) on the recording medium together with mapping information (MAPL) for searching and managing the recording unit (S20), the actual size of the recording unit or the number of reference sectors of the recording unit (32). The information on the Diff value from the sector is recorded in the 4-bit recording unit size field SOBU_SZ preset in the mapping information.

4A and 4B illustrate an operational flow diagram of a second embodiment of the method for recording digital data streams and the mapping information generation / recording method according to the present invention, which has been described with reference to FIG. It is an operational flowchart of a recording unit partition and mapping information generation / recording method applied to the method.

First, as described above, the controller 250 of the streamer 200 shown in FIG. 1 sets a recording mode to record a data stream received from the set-top box 100 on a recording medium such as a DVD (S30). Then, the received data stream is recorded on the recording medium (S31), and the amount of the recorded data stream, that is, the number of sectors and the recording time of the data stream are counted as 25.1 ms (S32). Then, when 1/2 of the maximum time that can be counted to 12 bits has elapsed, the recording state detection (S33) operation for detecting the number of sectors recorded so far is performed, and the number of detected sectors is the number of reference sectors defined by the method B. That is, it is detected whether or not it becomes 16 sectors or more, which is 1/2 of 32 sectors, and determines whether or not the recording state is normal (S34).

As a result of the determination, in the normal recording state (over 16 sectors of recording), after continuing the recording operation, it is detected whether or not the recorded data stream is 32 sectors (S35), so that one recording unit SOBU is divided ( S36), and selects attribute information for indicating attributes of the partitioned recording unit as attribute information 1 (0 0) from among a plurality of separately set attribute information (S37), while the determination result (S34) and the normal recording state ( 8 sectors (32/4) or more, that is, 8 to 15 sectors (S39), the recording operation is continued, and then 1/32 of the 32 sectors, which is the number of reference sectors prescribed by the method B, is continued. 2 That is, when 16 sectors are detected (S40), the 16 sectors recorded up to this time are partitioned into one recording unit (S41), and attribute information for indicating the attributes of the partitioned recording unit is divided into attribute information 2 (0 1). (S42).

In addition, in the case where the determination result (S34) is not a normal recording state (16 sectors or more) but 4 sectors (32/8) or more, that is, 4 to 7 sectors (S43), the method B is continued after the recording operation is continued. If one quarter of the 32 sectors, i.e., eight sectors, which is the standard number of sectors defined in Fig. 8 are detected (S44), eight sectors recorded up to this point are divided into one recording unit (S45), and attributes are divided into the divided recording units. If the attribute information to be displayed is selected as attribute information 3 (10) (S46), and the determination result (S34) is not 4 sectors (32/8) rather than the normal recording state (16 sectors or more) (S43). After the recording operation is continued, if one eighth of the number of 32 sectors, that is, four sectors, which is the number of reference sectors defined in the method B is detected (S47), one sector is recorded, that is, four sectors recorded up to this point. In step S48, attribute information indicating attributes of the partitioned recording unit is selected as attribute information 4 (10) (S46).

Thereafter, the selected attribute information is recorded on the recording medium together with mapping information for searching and managing the partitioned recording unit (S38). The attribute information indicates four types of attribute information using two bits. The selected attribute information is recorded in the recording unit size field SOBU_SZ or MAPU_SZ of the mapping information.

When the data stream is received at such a low speed, the recording size of the recording unit is variably partitioned, and the corresponding attribute is recorded together with the mapping information MAPL, thereby intermittently causing a padding area to be padded with unnecessary data on the recording medium. We don't have to keep recording.

In the above, the embodiment of the present invention for dividing the recording unit by varying the recording size of the data stream transmitted at low speed, and recording the attribute information together with the mapping information has been described. Hereinafter, the predetermined recording size of the recording unit is set. Another embodiment of the present invention will be described, wherein the information is divided into recording sizes, and the attribute information for the recording time or recording time intervals that are varied accordingly is recorded together with the mapping information.

FIG. 5 is a flowchart showing the operation of the third embodiment of the digital data stream recording and the mapping information generation / recording method according to the present invention, and the method A described with reference to FIG. It is an operation flowchart for the recording unit partition and mapping information generation / recording method according to the present invention to be applied.

First, as described above, the controller 250 of the streamer 200 shown in FIG. 1 sets a recording mode to record a data stream received from the set-top box 100 on a recording medium such as a DVD (S70). Then, the received data stream is recorded on the recording medium (S71), and the amount of the recorded data stream, that is, the number of sectors and the recording time of the data stream are counted as 20ms (S72). After 1/2 of the maximum time that can be counted to 12 bits has elapsed, the recording state detection (S73) operation for detecting the number of sectors recorded so far is performed, and the detected number of sectors is the minimum number of sectors defined by the method A. That is, it is judged whether or not 13 sectors or 13 sectors, which is 1/2 of 26 sectors, and whether the recording state is normal (S74).

As a result of the determination, in the normal recording state (more than 13 sectors of recording), after continuing the recording operation, the data stream recorded at the point of time (aX: a = integer) of an integer multiple of 20 ms (X) is 26 to 38 sectors. Detecting whether it is included in the sector (S75), partitioning one recording unit (SOBU) (S76), flag 0, and attribute information for indicating that the recording unit is counted at a normal recording time interval (20 ms), and A 12-bit count value that is normally counted is generated (S77).

On the other hand, when the determination result (S74) is not in the normal recording state (less than 13 sectors), the count value counted up to 20 ms until now is divided by 16 to adjust the count value up to the present (S79), and the count time interval. The recording time is counted by varying (S80) at 16 times slower time intervals, that is, 320 ms intervals. Thereafter, it is detected whether the number of recorded sectors becomes the minimum number of sectors defined in Method A, that is, 26 sectors (S81). The recording unit is partitioned (S82), and the recording unit is counted at an abnormal recording time interval (320 ms). Attribute information for display is generated as a flag 1 and a count value of N (Example 27) bits counted at a time interval of 320 ms (S83).

Then, the attribute information generated as described above is recorded on the recording medium together with the mapping information for managing the recording unit (S78). The information on the flag and the 12-bit or 27-bit count value of the attribute information of the recording unit is In the recording unit time interval field SOBU_PD preset in the mapping information MPAL.

6 is a flowchart illustrating the operation of the fourth embodiment of the digital data stream recording and the mapping information generation / recording method according to the present invention, and the method B described with reference to FIG. Is an operational flowchart for another recording unit compartment and mapping information generation / recording method according to the present invention, which is applied to.

First, as described above, the controller 250 of the streamer 200 shown in FIG. 1 sets the recording mode to record the data stream received from the set-top box 100 on a recording medium such as a DVD (S90). Then, the received data stream is recorded on the recording medium (S91), and the amount of the recorded data stream, that is, the number of sectors and the recording time of the data stream, is counted as 25.1 ms (X) (S92). Subsequently, a recording state detection (S93) operation for detecting the number of sectors to be recorded is performed, and when the number of detected sectors is the reference sector number and 32 sectors (S94) defined by the B method, the 32 sectors are recorded in one recording unit. (SOBU), and the time required for the recording unit compartment, that is, whether the recording time exceeds the maximum count time that can be counted by 12 bits is detected (S96). If the maximum count time is not exceeded, attribute information for indicating that the recording unit is partitioned within the normal count time is flag 0, and a 12-bit count value counting the recording time with 25.1 ms is generated as attribute information (S98). do.

On the other hand, if the detection result (S96) exceeds the maximum time that can be counted in 12 bits, the attribute information for indicating that the recording unit is partitioned beyond the normal count time is flag 1 and the recording time is counted as 25.1 ms. A count value of one N (e.g., 27) bits is generated as attribute information (S97).

Thereafter, the attribute information generated as described above is recorded on the recording medium together with the mapping information for managing the recording unit (S99). The flag and the 12-bit or N (eg, 27-bit) count of the attribute information of the recording unit are recorded. The value information is recorded in the recording unit time interval field SOBU_PD set in the mapping information MAPL.

When the data stream thus received is transmitted at a low speed, it is unnecessary by dividing the recording size of the recording unit into a predetermined predetermined size, and recording an attribute of the recording time or recording time interval that is varied accordingly with the mapping information MAPL. The padding area padded with data does not need to be intermittently / continuously recorded on the recording medium.

Meanwhile, FIG. 7 schematically illustrates mapping information MAPL generated by the digital data stream recording and mapping information generation / recording method according to the present invention, wherein the mapping information MAPL represents data stream time map information. The data stream time map information STMAPI is divided into (STMAPI), and the data stream time map information STMAPI is composed of the mapping information MAPL and the stream time map general information STMAP_GI.

First, in the stream time map general information STMAP_GI, the minimum recording unit size field MAPU_SZ_MIN additionally set in the present invention is present, so that the minimum number of reference sectors of the divided recording units can be identified. In the MAPL, the recording unit size flag SZ_FLAG additionally set in the present invention is present so that the attributes of the recording unit SOBU or MAPU as described above can be distinguished.

The digital data stream recording and mapping information generation / recording method according to the present invention made as described above records the received digital data stream, in particular, the digital data stream received at a low transmission rate at a predetermined recording size or a predetermined recording time. Generates or selects attribute information that can be partitioned / recorded in units, and generates or selects attribute information for identifying attributes of the recording unit, and records the mapping unit together with mapping information for searching and managing the recording unit, thereby generating in response to low speed transmission of the digital data stream. In order to prevent the recording unit from exceeding the recording unit time or the recording unit size, and to prevent the recording unit time from exceeding the recording unit size, intermittently / continuously padding the recording area on the recording medium. More efficient use of the recording area of the recording medium It is a very useful invention.

1 schematically illustrates a conventional digital data stream recording system,

2 is a diagram schematically showing a conventional recording unit partitioning method,

3A and 3B show an operation flowchart of the first embodiment of the digital data stream recording and the mapping information generation / recording method according to the present invention;

4A and 4B show an operation flowchart of a second embodiment of the digital data stream recording and the mapping information generation / recording method according to the present invention;

FIG. 5 is a flowchart showing the operation of the third embodiment of the digital data stream recording and mapping information generation / recording method according to the present invention;

6 is a flowchart showing the operation of the fourth embodiment of the digital data stream recording and mapping information generation / recording method according to the present invention;

7 schematically shows mapping information generated by the digital data stream recording and mapping information generation / recording method according to the present invention.

※ 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: recording medium (DVD) 240: read stream processing unit

Claims (13)

Dividing and recording the received digital data stream into recording units; Generating mapping information of the partitioned recording unit and attributes of the mapping information; And And determining the attribute of the generated mapping information and recording the attribute along with the mapping information. The method of claim 1, The first step, A first sub step of detecting the current size of the recorded recording unit after a predetermined time has elapsed after the start of recording the digital data stream in the recording unit; And And a second sub-step of limiting the recorded recording unit to a predetermined size according to the detected size. The method of claim 2, And said predetermined size is a size corresponding to the number of sectors that can be represented by 4 bits. The method of claim 1, The second step is a digital data stream recording method, characterized in that to generate a mapping information attribute to distinguish the mapping information according to the size of the partitioned recording unit. The method of claim 1, The second step, the digital data stream recording method, characterized in that for generating a mapping information attribute for distinguishing the mapping information according to the time interval of the partitioned recording unit. The method of claim 1, And the attribute of the mapping information indicates a type of a magnitude value of the mapping information. The method of claim 6, And the type indicates that the magnitude value is one of an actual magnitude and a difference value with a predetermined magnitude. The method of claim 1, And the attribute of the mapping information indicates one of a plurality of preset size values of the recording unit. The method of claim 1, And the attribute of the mapping information indicates the size of time interval information of the recording unit. The method of claim 1, And the attribute of the mapping information corresponds to a unit time size used for time interval information of the recording unit. The method of claim 8, And the plurality of size values represent four preset size values having a size of 2 bits. A step of recording the received digital data stream on a recording medium for a predetermined time; Dividing the data stream recorded in the predetermined time into recording units; And determining a recording type of the size information according to the size of the partitioned recording unit. A step of recording the received digital data stream on a recording medium for a predetermined time; Dividing the recorded data stream of a predetermined size into recording units; And determining a recording type of time interval information according to the time interval of the partitioned recording unit.