KR100606519B1 - Method for recording digital data stream on a rewritable disc - Google Patents

Abstract

The present invention relates to a method of receiving and storing a digital data stream on a recording medium such as a digital video disc, and generating and recording management information of the stored digital data stream, wherein the received digital data stream is recorded on the recording medium. If the recording time of the recorded data stream reaches a multiple of a predetermined time, and if the size of the recorded data stream is within a predetermined size range, the recorded data stream is divided into recording units, and the divided recording units By generating the management information corresponding to, since the size of the stream recording unit can be partitioned almost constant regardless of the transmission speed of the recording data stream, the maximum search time in the stream recording unit is substantially constant and The amount of generation is also related to the data rate It is almost certain to maintain without.

Description

Method for recording digital data stream and generating management information of recording stream {Method for recording digital data stream on a rewritable disc}

The present invention relates to a method for receiving a digital data stream, storing it in a recording medium such as a digital video disc, and generating and recording management information of the stored digital data stream.

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.

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, Receives a digital data stream from a set-top box and stores it in a streamer, such as a digital video disc (DVD) recorder, via a communication interface such as an IEEE-1394 serial bus, and edits the stored digital stream. And a system capable of reproducing digital audio and video through an AV output device such as a television by reproducing and transmitting the communication interface to the set-top box through media.

In such a system, the stream OBject (SOBU), which is the minimum recording unit for digital data streams, is recorded on a recording medium such as a DVD, and stream recording is particularly performed when the data rate of the recorded data stream is variable. Research on how to divide and record the SOBU is desired. In addition, studies have been made on how to construct a mapping list, which is management data generated and recorded for the search of the recording unit together with the recording of the data stream.

Accordingly, the present invention has been made in view of the above circumstances, and the digital data which can be recorded on the recording medium in recording unit units by varying the recording time unit of the recording unit according to the transmission speed of the digital data stream to be recorded. The purpose is to provide a stream recording method.

Another object of the present invention is to provide a method for recording and recording management information of a recording stream which can maintain a constant amount of management information generated when receiving and recording a digital data stream on a recording medium.

According to an aspect of the present invention, there is provided a digital data stream recording method comprising: a first step of recording a received digital data stream on a recording medium; A second step of checking whether a recording time of the data stream reaches a multiple of a predetermined time; And a third step of determining whether to divide the recorded data stream into recording units according to the size of the recorded data stream upon confirmation of arrival in the second step.

In addition, the method for generating and recording management information of a recording digital data stream according to the present invention comprises: a first step of dividing a received digital data stream into recording unit units and recording them on a recording medium; Generating and recording management information on the partitioned recording unit; A third step of confirming whether the transmission speed of the digital data stream to be recorded is variable; And a third step of updating and recording the recorded management information according to the confirmation result of the second step.

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

1 schematically illustrates an example of a system to which a digital data stream recording method according to the present invention may be applied. The system includes a set-top box 100, a communication interface (IEEE 1394), and a streamer 200. Consists of.

The set-top box 100 receives a transport stream (TS) multiplexed with a plurality of broadcast programs encoded by a system encoder from a broadcasting station, and demultiplexes the transport stream (TS), which is selected by the controller 140 according to a user's request. The decoder 110 decodes the transport stream for the broadcast program tuned by the system decoder 120 and outputs it through an AV set such as a television, or transmits the broadcast program tuned at the user's request to the IEEE1394 communication interface 130 or 210. The streamer 200 may be transmitted to the streamer 200 so that the streamer 200 records the broadcast program on a recording medium 230 such as a digital video disk (DVD).

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.

Next, a recording unit partitioning method for recording a digital data stream according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

When recording the digital data stream, the control unit 250 of the streamer 200 controls the storage stream processor 220 to record the input data stream on the recording medium 230. At this time, each transport stream packet (TS Pkt 1 to TS Pkt k) of the data stream is recorded in sector (Sector 1 to Sector n) units on the recording medium together with the transport stream packet arrival time (TS APAT). .

Here, the control unit 250 includes a stream recording unit for recording the stream of data [Stream OBject (SOBU); SOBU 1 to SOBU q] are divided into recording units, and SOBU entries for each stream recording unit are generated for the search of the recording data stream, and time entries for coarse navigation of the stream recording unit are generated as management information. Will be recorded. Here, the SOBU entry and the time entry are referred to as mapping list (time map information) of navigation data.

For the stream recording unit SOBU, a method of dividing the data stream to be recorded in units of a predetermined time may be considered, but this method has the following problems. That is, for example, when a digital data stream input at a bit rate of 10 Mbps is divided into stream recording units (SOBUs) of 1 sec and recorded, the size of the recording units (SOBUs) becomes 10 Mbits, The maximum search time in the stream recording unit (SOBU) is very long (10 Mbits / 10.08 Mbps) = 992 ms (where the assumption is made of 10.08 Mbps when decoding the recording stream).

On the other hand, when the partition unit time for the recording unit of the input data stream is set to a small value, for example, 0.1 sec, in order to reduce the search time, the digital data stream inputted at a bit rate of 1 Mbps is 4.7. When recording on a G Byte recording medium, the size of the recording unit (SOBU) becomes 0.1 Mbits, and the maximum seek time in one stream recording unit (SOBU) is very short (0.1 Mbits / 10.08Mbps) = 10 ms. Takes However, assuming that the SOBU entry is 2 bytes, the SOBU entry interval is 0.1sec, the time entry is 4 bytes, and the time entry interval is 10sec, the number of time entries is (4.7G Byte) / (input bit rate x time entry interval) = (4.7 × 1024 × 8) / (1 × 10) = 3850, and the number of SOBU entries is (4.7G Byte) / (input bit rate x time entry interval) = (4.7 × 1024 × 8) / (1 × 0.1) = 385024 pieces, and the size of the navigation data for the mapping list (time map information) becomes very large: (3850 x 4) + (385024 x 2) = 767 KByte. This is not applicable to a 4.7G byte real-time rewritable digital video disc (DVD-RTRW) which is configured to allocate the entire navigation data amount to 512 Kbytes and to allocate approximately 212 Kbytes to the time map information.

Therefore, in the mapping list generation method according to the present invention, the time X for reaching the target amount (the number of recording sectors) of the recording data stream at the maximum data transfer rate allowed by the system of FIG. 1 is set. The recording unit SOBU is partitioned at multiples of X close to the target amount n depending on the transmission speed.

That is, as shown in Fig. 2, for a digital data stream that is input and recorded at a high transmission rate, when the number of recording sectors reaches X time at the time when (n-1) records are recorded, the recording sectors S1... Sn-1) is divided into one stream recording unit SOBU. Also, for a digital data stream input and recorded at an intermediate transmission rate, when the number of recording sectors reaches 2X time at the time when (n + 1) recordings are recorded, the recording sectors S1... It is divided into recording units SOBU. In addition, for a digital data stream that is input and recorded at a low transmission rate, when the number of recording sectors reaches 3X time at the time when (n-2) recordings are made, one recording sector (S1… Sn-2) has been recorded. The stream recording unit SOBU is partitioned. The time X is preferably a multiple of 20 msec, for example.

When the stream recording unit is partitioned in this manner, the recording unit time of the stream recording unit SOBU varies greatly depending on the transmission speed, but the size of the stream recording unit SOBU can be substantially constant. Therefore, the maximum search time in the stream recording unit SOBU becomes almost constant regardless of the transmission speed of the data stream, and as the size of the stream recording unit SOBU is almost constant, the size of the time map information is also almost constant. Can be constant.

3 shows the configuration of a mapping list (time map information) generated and recorded by the digital data stream recording method according to the present invention.

In the figure, a stream record unit entry (SOBU Entry) is a record unit size (SOBU_SZ; SOBU_SZ # 1, SOBU_SZ # 2, ...) represented by the number of record sectors for the stream record unit (SOBU), and the record unit. SOBU period (SOBU_PD # 1, SOBU_PD # 2, ...). In addition, a time entry is generated and recorded as time map information for a predetermined time (for example, 10 sec) with respect to the stream recording unit SOBU recorded as described above, and the time entry is a corresponding stream record assembly. OBject; cumulative size (ACC_SZ; ACC_SZ # 1, ACC_SZ # 2, ...), which is a value obtained by accumulating the size of the preceding stream recording unit in SOB), and a time entry number (TM_ENT # 1, TM_ENT) which is an index number of the corresponding time entry # 2, ...), and the time difference TM_DIFF between the time indicated by the time entry index in the stream record assembly SOB and the cumulative time of the previous record unit SOBU. Here, when the time entry is generated in units of 10 sec, for example, the SOBU is divided into multiples of 20 msec. Thus, the time difference TM_DIFF is a multiple of 20 msec.

In addition, the shaded transport stream packet TS_PKT # 3 includes a packet arrival time (APAT) having the same value as the point indicated by the recording unit (SOBU) index or the closest small value. In this case, the time difference TM_DIFF at this time is related to the packet arrival time APAT corresponding to the transport stream packets TS_PKT # 1 and TS_PKT # 2.

Next, an embodiment of a configuration for stream record aggregate information, which is navigation data generated and recorded by the digital data stream recording method according to the present invention, will be described with reference to FIGS.

As shown in Fig. 4, the stream record aggregation information SOBI is composed of stream record aggregation general information SOB_GI and mapping list information MAPLI, and the mapping list information MAPLI is mapping list general information MAPL_GI. And a plurality of time entries and a plurality of stream recording unit entries (SOBU entries).

According to an embodiment of the mapping list general information MAPL_GI, a time entry number field (TM_ENT_Ns) indicating the number of time entries in the corresponding mapping list information, and the number of SOBU entries in the corresponding mapping list. SOBU entry count field (SOBU_ENT_Ns) indicating whether the SOBU period is changed in the corresponding mapping list. If the SOBU period is variable, for example, set to "1". The variable flag VBR_FLAG is used to indicate the SOBU time interval in the corresponding mapping list, and when the variable flag VBR_FLAG is "0" (that is, the SOBU period in the corresponding mapping list is constant). When the SOBU time interval field (SOBU_PD) exists only, the time entry interval field (TM_ENT_IT) indicating the time entry interval, and the size of the preceding record aggregate (SOB) expressed as the number of sectors It may be configured by the address offset field (ADR_OFS) of the mapping list information represented by.

In addition, one embodiment of the time entry is an SOBU entry index number field (SOBU_ENT_N) indicating an index number of an SOBU entry, as shown in FIG. 6, for a preceding stream recording unit in the stream record aggregation SOB. A cumulative size field (ACC_SZ) indicating a cumulative size (number of sectors), indicating the time difference between the time indicated by the time entry index in the stream record set (SOB) and the cumulative time of the previous record unit (SOBU). It consists of a time difference field TM_DIFF.

In addition, according to one embodiment of the SOBU entry, a recording unit size field SOBU_SZ indicating the number of recording sectors for the corresponding stream recording unit SOBU, and a corresponding recording unit time interval as shown in FIG. SOBU time interval field (SOBU period).

Next, a digital data stream recording method and a management information generation recording method according to an embodiment of the present invention will be described with reference to Figs. 1, 8A and 8B.

When the user request to record the data stream selected and tuned by the channel selection processing unit 110 of FIG. 1 on the recording medium is input (step S11), the control unit 140 of the set-top box 100 is the IEEE 1394 communication interface (130,210). In addition, the controller 250 of the streamer 200 notifies that the current recording mode is set, and transmits the received input data stream to the streamer 200 through the communication interfaces 130 and 210. The control unit 250 of the streamer 200 controls the data stream input through the IEEE 1394 communication interface (130, 210) to be recorded on the recording medium 230 by the storage stream processing unit 220 (step S13), At the same time, the count of the number of sectors currently recorded, and the counting of the SOBU time T1 and time entry time T2 are started. At this time, each transport stream packet (TS Pkt 1 to TS Pkt k) of the data stream consisting of transport stream packets has a sector (Sector 1 to Sector n) on the recording medium together with the transport stream packet arrival time (TS APAT). Are recorded in units of).

Thereafter, the control unit 250 of the streamer 200 checks whether or not the timed SOBU time T1 reaches a predetermined time X (for example, 20 msec) (step S17). Is reached, it is checked whether or not the counted number of recording sectors Sn has reached the target number n (for example, 32). (Step S19). If the predetermined number is not reached in the step S19, the control unit 250 returns to the step S17, and multiplies the predetermined time with respect to the displayed SOBU time T1 (aX; a = 2,3). For example, 40 msec, 60 msec, 80 msec, ..., while increasing the count number of recording sectors Sn with a target number n (e.g. 32) The above operation is repeated until it reaches the vicinity. Here, the vicinity of the target number n means a value larger than "n-i" (where i is, for example, 7).

On the other hand, when it is confirmed in step S19 that the predetermined number is reached, the control unit 250 divides the recording data stream into one stream recording unit SOBU at that time and the SOBU for the stream recording unit. Create and record an entry. Here, the SOBU entry records the timed SOBU time T1 as SOBU time interval SOBU PD as shown in FIG. 7, and records the counted number of sectors Sn as SOBU size SOBU_SZ. .

Thereafter, the controller 250 resets (clears) the timed SOBU time T1 and the count sector number Sn, and then counts the timed count and the number of sectors Sn of the SOBU time T1. It starts again (step S23).

Subsequently, the control unit 250 determines whether the time entry time T2 that has been reached has reached a predetermined time R (for example, 10 sec) (step S25). It is checked whether the SOBU time T1 reaches a predetermined time X (for example, 20 msec). At this time, if the SOBU time T1 does not reach a predetermined time X (for example, 20 msec), the process returns to the above-described step S25.

If it is determined in step S25 that the time entry time T2 has reached a predetermined time R (for example, 10 sec), the controller 250 generates and records a time entry (step S27), and proceeds to step S29. do. In this time entry, as shown in FIG. 6, the SOBU entry index number records the number of SOBU entries to which the stream currently being recorded is, and immediately preceding (previous) SOBU in the corresponding stream record set SOB. The number of sectors accumulated up to the entry is recorded in the cumulative size ACC_SZ, and the currently timed SOBU time T1 is recorded as the time difference TM_DIFF.

On the other hand, if it is determined in step S29 that the SOBU time T1 as indicated has reached a multiple of the predetermined time aX (a = 1, 2, 3,...), The control unit 250 at that time It is checked whether or not the counted number of recording sectors Sn has reached the target number n (for example, 32) (step S31). If the predetermined number is not reached in the step S31, the control unit 250 returns to the step S25 described above, while increasing the constant time by a multiple of aX with respect to the SOBU time T1. The above operation is repeated until the counted number of recording sectors Sn reaches a target number n (for example, 32), while increasing a by 1. Here again, the vicinity of the target number n means a value larger than "n-i" (where i is, for example, 7).

On the other hand, when it is determined in step S33 that the predetermined number is reached, the control unit 250 divides the recording data stream into one stream recording unit SOBU at that point, and the SOBU for the stream recording unit. An entry is generated and recorded as shown in Fig. 7 (step S33), the reset SOBU time T1 and the count sector number Sn are reset (cleared), and then the SOBU time T1 is counted. And the count of the number of sectors Sn is restarted (step S35).

Subsequently, the control unit 250 checks whether the recording mode is terminated at the request of the user, and if the recording mode is not finished, the control unit 250 returns to the step S25. It is confirmed whether or not it is variable (step S39). Here, whether or not the transmission rate of the recording data stream is variable means that the transmission rate is not variable when the SOBU time intervals (SOBU_PD) included in the recorded SOBU entries are all the same, and at least one is not the same. It can be seen that is variable.

When it is determined in step S39 that the transmission speed is variable, the controller 250 generates and records the mapping list general information as shown in FIG. 10A, where the variable flag VBR_FLAG is set to "1". (Step S41).

Thereafter, the controller 250 generates reproduction order information (Cell) (not shown) with respect to the data stream recorded as described above, and records it as reproduction order information corresponding to a record (or a program) which is a recording unit. (Step S45).

On the other hand, if it is determined in step S39 that the transmission speed is not variable, the controller 250 generates and records mapping list general information as shown in FIG. 5, wherein the variable flag VBR_FLAG is set to "0". Is set. At the same time, the controller 250 updates and records all of the generated time entries and SOBU entries as shown in Figs. 10B and 10C, respectively (step 43), and proceeds to step S45. Here, if the transmission speed is not variable, since the stream recording unit is partitioned into a constant size, the SOBU entry index number (SOBU_ENT_N) and the time difference (TM_DIFF) existing in the previously recorded time entry become unnecessary and are also recorded previously. The stream recording unit time interval SOBU_PD present in the completed SOBU entry is also unnecessary.

As described above, according to the digital data stream recording method according to an embodiment of the present invention, even if the transmission speed of the recording data stream is variable, the amount of generation of the mapping list information of the navigation data can be kept substantially constant, and the recording data By generating mapping list information according to whether or not the transmission speed of the stream is variable, the amount of generation of the mapping list information is reduced.

Next, another embodiment of the mapping list information MAPLI in the stream record aggregate information, which is navigation data generated and recorded by the digital data stream recording method according to the present invention, will be described with reference to FIGS. Shall be.

In the present embodiment, the mapping list general information MAPL_GI is shown in FIG. 11A except that the variable flag field VBR_FLAG of FIG. 5 is replaced with the variable flag / SOBU target amount field VBR_FLG / SOBU_TAR_AMTs. Same as 5.

The variable flag / SOBU target amount field (VBR_FLG / SOBU_TAR_AMTs) is for indicating whether the SOBU period is variable in the corresponding mapping list as shown in FIG. 11A, and the SOBU period is variable. For example, the variable flag variable flag (VBR_FLG) set to "1" and the recording unit target amount (SOBU_TAR_AMTs) indicating the target sector amount n (for example, 32) of the stream recording unit SOBU in the corresponding mapping list. It consists of. Incidentally, in this embodiment, the time entry uses the same configuration as that of the above embodiment (see Fig. 6).

In this embodiment, the SOBU entry is for indicating the number of recording sectors for the corresponding stream recording unit (SOBU) as shown in FIG. 12. The SOBU entry indicates a difference value between the number of SOBU recording sectors and the target amount of SOBU_TAR_AMTs. A recording unit size field (SOBU_SZ) to be displayed and a SOBU time interval field (SOBU period) indicating the recording unit time interval are displayed. Here, the difference value is expressed as ± α in the target amount n (for example, 32).

In the mapping list structure of the present embodiment described above, when the speed of the recording data stream varies, the mapping list general information MAPL_GI is configured as shown in FIG. 13A, the time entry is configured as shown in FIG. 6, and the SOBU entry is shown in FIG. It is composed as 12. When the speed of the recording data stream is constant, the mapping list general information MAPL_GI is configured as shown in FIG. 11A, the time entry is configured as shown in FIG. 6, and the SOBU entry is configured as shown in FIG. 13B. Therefore, when the speed of the recording data stream is constant, the SOBU entry can be configured with 1 byte, thereby reducing the data amount of the mapping list information.

On the other hand, the present invention is not limited to the above specific embodiments, it can be carried out by various modifications and modifications within the scope not departing from the gist of the present invention.

For example, in the specific embodiment described above, the data stream is recorded when the time for recording the data stream reaches a multiple (X; a = 1, 2, 3, ...) of a predetermined time (X; for example, 20 msec). When this number of recorded sectors reaches the target number n (e.g. 32), that is, larger than the number represented by ni (where i is e.g. 7), the recorded data stream In the present invention, the time required to record the data stream is a multiple of a predetermined time (aX; a = 1,2,3,...) In order to make the number of sectors for the stream recording unit more consistent. At the point of time of arrival, the stream recording unit is divided at the point of time when the recording time reaches the next constant time multiple [(a + 1) X] based on the number of sectors currently recorded as well as the currently increasing sector amount. Whether or not to partition at this point You may make a decision. Furthermore, the present invention may count the number of sectors allocated to the data stream to be recorded, and determine whether to divide the recorded data stream into recording units based on the counting sector and the number of sectors increasing per unit time. .

According to the digital data stream recording method according to the present invention as described above, when receiving a digital data stream and storing it on a recording medium such as a digital video disk, the division of the stream recording unit (SOBU) according to the transmission speed of the data stream to be recorded. The stream recording unit SOBU is partitioned by setting the time unit in multiples of a predetermined time so that the size (number of sectors) of the stream recording unit is close to the target value, thereby stream recording unit (regardless of the transmission speed of the recording data stream) Since the size of SOBU can be partitioned almost uniformly, the maximum search time in the stream recording unit becomes almost constant, and the amount of management information (navigation data) is kept almost constant regardless of the data stream transmission speed. It becomes possible. In addition, by generating mapping list information according to whether or not the transmission speed of the recording data stream is variable, the amount of generation of the mapping list information is reduced.

1 schematically shows a system to which a digital data stream recording method according to the present invention is applied,

2 is a diagram showing a partitioning method of a stream recording unit for a digital data stream recorded by the present invention;

3 is a diagram illustrating a method of generating a mapping list for a digital data stream recorded by the present invention.

4 shows the configuration of stream record aggregate information generated and recorded by the digital data stream recording method according to the present invention;

FIG. 5 shows an embodiment of the mapping list general information shown in FIG. 4;

FIG. 6 illustrates an embodiment of the time entry shown in FIG. 4.

FIG. 7 shows an embodiment of the stream record unit entry shown in FIG. 4;

8A and 8B show a flow for the digital data stream recording method according to the present invention,

10A illustrates an embodiment of mapping list general information when a transmission speed of a digital data stream to be recorded varies.

10B and 10B illustrate embodiments of time entry and stream recording unit entries, respectively, when the transmission speed of the digital data stream to be recorded is constant.

11A and 11B illustrate another embodiment of the mapping list general information shown in FIG. 4.

FIG. 12 shows another embodiment of the stream record unit entry shown in FIG. 4;

FIG. 13A illustrates an embodiment of mapping list general information when a transmission speed of a digital data stream to be recorded varies.

FIG. 13B shows an embodiment of the stream record unit entry when the transmission speed of the digital data stream to be recorded is constant.

※ 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 (9)

A first step of recording the received digital data stream on a recording medium; A second step of checking whether a recording time of the data stream reaches a multiple of a predetermined time; And And a third step of determining whether to divide the recorded data stream into recording units according to the size of the recorded data stream upon confirmation of arrival in the second step. The method of claim 1, The third step, A lower step of checking whether a size of the recorded data stream is included in a predetermined size range; And And a second step of dividing the recorded data stream into recording units when it is determined to fall within the predetermined size range. The method of claim 2, The second step, If it is determined that it is not included in the predetermined size range, the value of the checked multiple is further increased by one times the predetermined time, and the lower 3 to check whether the recording time of the data stream reaches the increased multiple of the predetermined time step; And And a fourth step of checking whether the recorded data stream is included in a predetermined size range when the arrival is confirmed in the third step. The method of claim 1, And a fourth step of recording the size information and the recording time information of the partitioned recording unit as recording unit information. The method of claim 4, wherein And a fifth step of generating and recording coarse search information for coarse searching of the recorded recording unit in units of a predetermined recording time of the data stream. The method of claim 5, The schematic search information includes an index number of a corresponding recording unit, a cumulative size for the recording units recorded up to that time, and a time between the recording unit units divided by the recording unit information and the time indicated by the schematic search information. A digital data stream recording method comprising a time difference. The method according to any one of claims 1 to 6, And the size of the record stream is the number of record sectors. The method according to any one of claims 1 to 6, And said predetermined time is a multiple of 100 msec. A first step of recording the received digital data stream on a recording medium; Counting a number of sectors allocated to the recorded data stream; And And determining whether to divide the recorded data stream into recording units based on the counting sectors and the increasing number of sectors per unit time.