KR100309247B1 - Method and apparatus for recording time information on digital data stream - Google Patents

Abstract

The present invention partitions and records a received digital data stream into a recording assembly and a recording unit on a recording medium such as a digital video disc, and the visual information for searching for it corresponds to the time format of management information. The present invention relates to a method of recording visual information of a recorded digital data stream using the same during a search operation, a search method using the same, and a recording medium according thereto, wherein the visual information of the recorded digital data stream corresponds to a user's search request time. By recording as much as possible, and reading and using it in a search operation, it is an invention to perform a quick / precise search operation without additional information.

Description

Method for recording time information of a recording digital data stream and apparatus therefor {Method and apparatus for recording time information on digital data stream}

The present invention records and plays the received digital data packet stream unit on a recording medium such as a digital video disc, or an external application such as a D-TV.

In transmitting to the apparatus, each of the received packet stream units is accurately searched from the recording medium for each desired packet stream unit desired by the user, and the timing clock is correctly synchronized with each other when the correctly detected packet stream units are transmitted through the digital interface. A method and apparatus for recording and transmitting time information for recording corresponding time information.

In conventional analog television broadcasting, a video signal is transmitted through an AM or FM modulation and transmitted through a radio wave and a wired cable. However, in recent years, the standardization of digital television broadcasting has been increased due to the development of digital technologies such as digital image compression and digital modulation and demodulation. It is making rapid progress and digitizing existing terrestrial, satellite and cable broadcasts based on the Moving Picture Experts Group (MPEG).

According to the development of digital video / audio compression technology and digital transmission technology, the digital broadcasting can provide a higher quality broadcasting service than an analog broadcasting signal service, and in particular, can transmit a plurality of broadcasting programs in the same bandwidth, and digital communication media. And an increase in interoperability with digital storage media.

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 a set top box through media.

In such a system, a recording unit (Stream OBject (SOB)), which is a recording unit for a digital data stream of a single program, on a recording medium such as a DVD, and a recording unit (SOBU), which is a recording unit constituting the recording assembly, is described. Research on how to create and record the partitioned record and the search information for searching and managing the partitioned SOB and SOBU is particularly desired. In particular, a search request time selected by a user is specified. There is a demand for a study on how to quickly search a record data stream corresponding to a (Search time) without searching errors.

Accordingly, the proposed conventional digital data stream recording and management information generation recording method will be described in detail with reference to the accompanying drawings.

First, FIG. 1 schematically shows a system to which a conventional management information generation recording method of a conventional recording digital data stream is applied, and FIG. 2 shows a recording and management information generation recording process of a digital data stream made by the system. As shown, first, the system is composed of a set-top box 100, a communication interface (IEEE 1394) and a streamer (Streamer) 200, the set-top box 100 is encoded and transmitted by the system encoder of the broadcasting station Receives and demultiplexes a transport stream (TS), which is a broadcast program of a broadcasting station, and at the request of the user, the controller 140 controls the transport stream for the broadcast program tuned by the channel selection processor 110 to the system. A decoder 120 decodes and outputs it through an AV set such as a television, or tunes a broadcast program tuned at the user's request. By transmitting to the streamer 200 through the E1394 communication interface (130, 210), the streamer 200 can record the broadcast program to a recording medium 230, such as a digital video disc (DVD), The streamer 200 reads the broadcast program recorded on the recording medium 230 according to a user's request, and transmits the broadcast program to the set top box 100 through the IEEE1394 communication interface 210 or 130, and the set top box 100. Decodes the broadcast program transmitted from the streamer 100 to the decoder 120 and outputs it to the television so that the broadcast program recorded on the recording medium can be reproduced and output on the television screen.

Meanwhile, as illustrated in FIG. 2, the controller 250 of the streamer 200 records data streams transmitted from the set-top box 100 on the recording medium 230 by the storage stream processor 220. In order to control the data stream, each transport packet (TSP: Transport Packet) time of arrival (Packet Arrival Time) information-This time information is based on the transmission time at the time of transmission after reproduction of the recording data Information is recorded on the recording medium in units of sectors, and when the recording unit sector has a predetermined recording size, for example, 32 sectors, the recorded data stream is converted into a recording unit (SOBU: Stream OBject). When the recording operation is terminated or stopped by the user, the partitioned recording units SOBU are partitioned into a single stream aggregate (SOB). In addition, the time management information for searching and managing the SOB and SOBU which are recorded in such a manner, for example, the start stream packet arrival time (S_S_APAT) and the packet arrival time increase amount of the recording assembly. Management data such as (IAPAT: Incremental APAT) information, that is, navigation data is generated and recorded, and the management information which is a recording unit and navigation data of the recorded digital data stream will be described below with reference to the accompanying drawings. As follows.

First, as shown in FIG. 3, the recording digital data stream received from the set-top box 100 includes: a transmission packet (TSP) including an application packet and packet arrival time information (PAT or Time Stamp); A unit sector including the transmission packets (TSPs) and a plurality of header information; A recording unit SOBU partitioned and recorded in predetermined sector units, for example, 32 sector units; It is partitioned and recorded into a recording assembly SOB composed of recording units SOBU having temporal continuity, while management information which is navigation data of a recording digital data stream, that is, management information for searching and managing the recording assembly SOB ( As shown in FIG. 4 and FIG. 5, SOBI: SOB Information (SOBI Information) is a mapping list which is management information of SOB General Information (SOB_GI) and the recording unit SOBU constituting the SOB. (MAPL: MAPping List), and the recording aggregate general information SOB_GI includes the start stream packet arrival time S_S_APAT, which is the start position time information of the recording aggregate SOB, and the like. As shown in Fig. 2, the MAPping List (IAPAT: Incremental APAT) information, which is a count value (number), counted at a predetermined unit time (X) interval during a recording unit (SOBU) partition time, is used. Record, navigate It is used as search information for searching the SOB and SOBU upon request.

Meanwhile, as shown in FIG. 6, the start stream packet arrival time (S_S_APAT) information recorded in the record aggregation general information SOB_GI is 300 by counting 9 bits at 27 MHz according to the MPEG standard in the streamer 200. A total of 6 bytes of packet arrival times (PATs) are recorded using a small unit time of dividing (PAT_ext) and a large unit time (PAT_base) of counting 39 bits at 90 Khz, whereas the application packet of FIG. Unlike the start stream packet arrival time (S_S_APAT) format, the time stamp recorded together with the time stamp is different time counting up to 159 seconds (159 = 2 ³² / 27Mhz) by counting 32 bits at 27 MHz. A total of 4 bytes of packet arrival time (PAT) with a base is recorded.

Hereinafter, a method of searching for a recorded digital data stream corresponding to a search request time by using management information and time information of the SOB, the recording unit SOBU, and the transmission packet TSP, which are separately recorded as described above. For example, it will be described in detail as follows.

First, as shown in FIG. 2, when searching for a data stream corresponding to a user's search request time (ST), that is, a recording position S of a transmission packet TSP, first, the general information of the recording aggregate (SOB_GI). Compares the start stream packet arrival time (S_S_APAT) information recorded on the < RTI ID = 0.0 &gt; to &lt; / RTI &gt; with the search request time (ST) to detect a close start stream packet arrival time (S_S_APAT &lt; = ST) that does not exceed the search request time. By accumulating (IAPAT 1 to 4 = 12) the packet arrival time increase amount (IAPAT) information recorded on the mapping list MAPL of the recording aggregate SOB # 1 corresponding to the detected start stream packet arrival time S_S_APAT. Multiplying a predetermined unit time (X), and adding the starting stream packet arrival time (S_S_APAT) to the summation time (S_S_APAT + (ΣIAPAT (= 12) x X)). Map corresponding to adjacent time (S_S_APAT + (ΣIAPAT x X) <= ST) not exceeding Find the entry of the ping list MAPL, multiply the index value of the entry by the number of sectors (eg, 32 sectors) of the recording unit SOBU, and then record the desired recording unit SOBU, for example, the fifth recording shown in FIG. The position of the unit SOBU 5 is searched.

Thereafter, from the start position A 'of the searched recording unit SOBU 5, a 4-byte packet arrival time PAT, which is time information Time Stamp of the transmission packet TSP, is detected, and the detected packet is detected. The difference time between the arrival time PAT and the packet arrival time PAT of the first transmission packet TSP of the recording unit SOBU 5 is the search request time ST and the summed time S_S_APAT + (ΣIAPAT). x X)) is searched for a transport packet TSP having a packet arrival time (PAT), which corresponds to the difference time between the start stream packet arrival time (S_S_APAT) and the transport packet (TSP). PAT is a completely different time information having a different time base, that is, the packet arrival time (PAT) of the detected transmission packet (TSP) is, as described above, the search request time (ST) and the start stream packet arrival time ( Unlike S_S_APAT), the different units of time (PAT) for counting a period up to 159 seconds ^{(159 = 2 32 / 27Mhz)} , Since the time information is not directly related to the search request time ST, the transmission packet of the desired search position S is obtained by using the time length of the packet arrival time PAT recorded in the recording unit SOBU 5. This is because the fine search must be performed.

However, the recording position A searched by the time information S_S_APAT + (ΣIAPAT x X) calculated on the basis of the packet arrival time increase amount IPAT is recorded in the recording unit SOBU 5 as shown in FIG. This corresponds to the A position, not the actual starting position of A ', and a difference value occurs between the A' position and the A position. Therefore, between the recording position of the transmission packet searched by the above fine search operation and the search position S corresponding to the search request time ST requested by the user, the recording size difference value between the A 'position and the A position There is a problem that a search delay corresponding to (Offset) occurs.

Therefore, in order to accurately search the recording position S of the transmission packet corresponding to the search request time ST, additional additional information that provides a recording size difference value (Offset) between the A 'position and the A position must be provided (Fig. Information of Offset_SZ of 2) is required. When the additional information (Offset_SZ) is generated and recorded for each recording unit SOBU, since a large number of management data areas are required, data to be recorded on the recording medium is recorded. There is a problem that results in extremely low recording capacity of the stream.

In addition, the exchange of digital data between the set-top box 100 and the streamer 200 is performed through the IEEE 1394 digital communication interface. A digital communication interface such as IEEE 1394 is used to deliver real-time digital data at a predetermined time. A time stamp is inserted into each transport stream packet using an internal clock of 24.576 MHz to transmit data to the other side according to the time interval.

However, the streamer 200, which is a recording apparatus of digital data, also adds a separate time stamp to the transport stream packet of the recording data for reproduction during the use of the 27 MHz clock as described above. Since there is a difference from the frequency of the clock used by the digital interface, a time difference may occur between the time of the transmission stream due to 24.576 MHz and the time of the streamer 200 received based on the 27 MHz transmitted through the interface. When this difference is accumulated, there is a problem that a transport stream of digital data transmitted at the time of recording and reproducing is not transmitted at a predetermined original time interval, and thus a breakdown or skipping of the reproduced image occurs.

In recording the received digital data packet stream unit on a recording medium such as a digital video disc, the user may obtain time information corresponding to each of the received packet stream unit so that each predetermined packet stream unit desired by the user is accurately searched from the recording medium. The timing of the search is generated by generating a transmission unit in a time format corresponding to the search request time of the unit and adding the received unit to each of the received packet stream units so as to partition and record these transmission units into recording units and recording units on a recording medium. It is an object of the present invention to provide a method and apparatus for generating and recording time information corresponding to each of the received packet stream units, which eliminates an error.

In addition, the present invention generates and records the received time information so that each received transport packet stream unit received time information added to the received transport packet stream unit at the time of recording is synchronized with a clock used by a medium such as a digital interface. It is another object to provide a method and apparatus.

1 schematically illustrates a system to which a management information generation recording method of a general recording digital data stream and a search method using the same are applied;

2 illustrates a process of recording and recording management information generation of a general digital data stream;

3 shows a hierarchical diagram of recording units of a general recording digital data stream,

4 shows management information of a general record data stream,

5 shows some detailed management information of a general record data stream;

6 shows time information of a general recording digital data stream,

7 illustrates time information of a recorded digital data stream according to an embodiment of the present invention,

8 illustrates a relationship between a recording unit and time information according to an embodiment of the present invention.

9 illustrates time information included in a header of a data stream transmitted by an IEEE 1394 interface,

10 illustrates a recording format of arrival time information of a digital data stream according to another embodiment of the present invention.

11 illustrates an embodiment of a synchronization device having different clock frequencies from each other by time information of a data stream according to the present invention.

FIG. 12 schematically shows the output waveform of the main part of FIG.

※ 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

According to an aspect of the present invention, there is provided a method of recording time information of a recording digital data stream, the method comprising: checking a packet arrival time of a received transmission packet; And recording the confirmed packet arrival time in a format corresponding to the format of the search time information of the recorded data.

In addition, a recording medium on which time information of a recording digital data stream according to the present invention is recorded, the recording medium includes: a data area in which time information on a packet arrival time and a transmission packet are divided into recording units; And a management data area in which search time information having a format corresponding to a format of time information on the packet arrival time is recorded.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method for recording and transmitting time information of a recording digital data stream according to the present invention will be described in detail with reference to the accompanying drawings.

First, with respect to the time information of the recording digital data stream according to the embodiment of the present invention, the time information of the recording digital data stream according to the embodiment of the present invention, in particular, the start stream packet arrival time S_S_APAT and the transport packet TSP. Referring to FIG. 7 illustrating a packet arrival time (PAT), the start stream packet arrival time (S_S_APAT) information recorded in the record aggregation general information SOB_GI shown in FIG. 7 is generated when the digital data stream is generated. Using the same method as the clock counting method, 6 bytes are used, using a small unit time (PAT_ext) that counts 9 bits of a transport stream at 27 MHz and a large unit time (PAT_base) that counts 39 bits at 90 kHz. Packet arrival time (PAT) is recorded for use as transmission time reference information, and packet arrival time (PAT) of the transmission packet (TSP) is a small unit that divides 300 bits by counting 9 bits at 27 MHz. A transmission unit is generated by generating a packet arrival time (PAT) of 4 bytes in total using each unit (PAT_ext) and a large unit time (PAT_base) that counts 23 bits at 90 Khz and adds it to each received transmission packet (TSP). After the formation, it is divided into recording aggregates and recording units on the above-described recording medium.

Accordingly, the packet arrival time (PAT) of the transmission packet (TSP) recorded in the four bytes is composed of the lower four bytes of the start stream packet arrival time (S_S_APAT) recorded in the six bytes, and consists of the six bytes. The lower time of the start stream packet arrival time S_S_APAT coincides with the packet arrival time PAT of 4 bytes which are always recorded. In addition, as described above, the user's search is requested as 6 bytes of time information using a small unit time (PAT_ext) and a large unit time (PAT_base), similar to the start stream packet arrival time (S_S_APAT) according to the MPEG standard. It also coincides with the time of the lower 4 bytes of the request time (ST).

For reference, the packet arrival time PAT of the transport packet TSP may be recorded using the same 6 bytes as the start stream packet arrival time S_S_APAT, but the digital data stream is recorded. In order to improve the recording efficiency of the recording medium to be recorded, it is preferable to record using a length smaller than 6 bytes, for example, 4 bytes as described above. Although it may be considered that a problem may occur because the time period is reduced, it can be seen that there is no problem in searching for a desired packet according to the method described below.

On the other hand, the packet arrival time (PAT) of the transmission packet (TSP) recorded in 4 bytes as described above uses a large unit time (PAT_base) that counts 23 bits at 90 Khz. Therefore, the maximum time is approximately 93.2 seconds (93.2 = 2). counting the ²³ / 90Khz), and is then re-zero (zero) a reset (reset) re-counting as shown in Fig.

FIG. 9 shows that the streamer 200 resets the digital data stream received from the set-top box 100 at an interval of about 93.2 seconds from a recording unit SOBU partitioned and recorded at a predetermined recording size, for example, 32 sectors. The packet arrival time (PAT) of the transmission packet (TSP) is shown. The transmission speed of the data stream received from the set-top box 100 is at a low speed of at least 10 Kbps, and the recording unit (SOBU) is divided into 32 sector units. In addition, when the recording size of the sector is 2048 bytes, the time required for partition recording of one recording unit SOBU is about 52.4 seconds (52.4 = 32 sector X 2048 bytes / 10 Kbps). time packet arrival time (PAT) of the transport packet (TSP) that is a zero (zero) a reset (reset) has, is about 93.2 seconds (93.2 = 2 ²³ / 90Khz) as described above.

Therefore, as shown in FIG. 9, the time at which the recording unit is divided (S1, S2 ...) is 52.4 seconds apart, the time at which the packet arrival time PAT is reset, and the reset identification. The time at which the information PAT_carry is generated (R1, R2 ... and C1, C2 ...) is 93.2 seconds apart, so that even if the reception speed is low, if the reception speed is 10 Kbps or more, it is within one recording unit (SOBU). In this case, there is no transmission packet TSP having the same packet arrival time (PAT).

Hereinafter, a method of searching for a digital data stream recorded as shown in FIG. 9 will be described. First, as described with reference to FIG. 2, a data stream corresponding to a user's search time (ST) is transmitted. When searching the recording position S of the packet TSP, the search is performed by first comparing the start stream packet arrival time S_S_APAT information recorded on the record aggregation general information SOB_GI with the search request time ST. Detects the adjacent start stream packet arrival time (S_S_APAT <= ST) that does not exceed the request time, and on the mapping list (MAPL) of the record aggregation SOB # 1 corresponding to the detected start stream packet arrival time (S_S_APAT). Cumulative sum (IAPAT 1 to 4 = 12) of the packet arrival time increase amount (IAPAT) information recorded in &lt; RTI ID = 0.0 &gt; 1, &lt; / RTI &gt; multiply by a predetermined unit time X, and then add the packet arrival time increment S_S_APAT. Then, the recording unit corresponding to the adjacent time S_S_APAT + (ΣIAPAT x X <= ST) in which the summed time S_S_APAT + (ΣIAPAT (= 12) x X) does not exceed the search request time ST. (SOBU) That is, the fifth recording unit (SOBU 5) is searched and selected.

As a result, the user selects and selects the recording unit SOBU 5 corresponding to the two-byte upper time of the search request time ST requested by the user.

Then, the recording position A 'different from the recording position A corresponding to the summed time S_S_APAT + (ΣIAPAT (= 12) x X), that is, the starting position A of the selected recording unit SOBU 5 (4) packet arrival time (PAT), which is the time stamp of the transmission packet (TSP) recorded in 4 bytes, is detected, and the lower time from which the upper time is excluded is excluded from the search request time (ST). In comparison, a transport packet TSP having a matching packet arrival time (PAT) is searched for.

As described above, a recording unit corresponding to a part of a higher time of the search request time ST requested by the user using the start stream packet arrival time S_S_APAT and the packet arrival time increment amount IPAT information of the mapping list MAPL. (SOBU 5) is searched and selected, the packet arrival time (PAT) of the transmission packet TSP constituting the selected recording unit (SOBU 5) is detected, and coincides with some lower time of the search request time (ST). By searching the transmission packet TSP having the packet arrival time PAT, the transmission packet TSP of the recording position S that matches both the upper time and the lower time of the search request time ST is searched. .

Until now, the arrival time of a received transport packet is generated and added to each transport packet to generate and record a transport stream unit, wherein the arrival time information is recorded on a recording medium, or a search time information format or user's search time. Although a method of recording in a format corresponding to the information format has been described, the reception time information of each transport packet stream unit added to the received transport packet stream unit is the same as the search time information format or the user search time information format. Generating and recording received time information to be synchronized with a clock format used by a medium such as a digital interface that counts up as a small unit time field counted in a certain range and the small unit time field is carried up. An example is explained in full detail.

FIG. 9 illustrates a data format of a time stamp used when real-time data is transmitted in an IEEE 1394 communication interface, which is a digital bus, wherein a 12-bit cycle offset field, a 13-bit cycle count field, and 7 are shown. It consists of a reserve field of bits. The cycle offset field represents a time interval of 125 μsec or less in 0 to BFF (h) as a unit of 24.576 MHz clock periods, and the cycle count is 0 to 1F3F (h) as a time interval of 1 sec or less in 125 μsec (= 8 kHz). Expressed as That is, the cycle offset field counts up by 1 every 24.576 MHz clock cycles, counts up to BFF (h), then becomes '0' at the next count, and a carry occurs to cause the cycle count to count up by one. .

FIG. 10 shows a data format for the arrival time of a transport stream packet according to the present invention for synchronizing with the system clock of the IEEE 1394 communication interface as shown in FIG. It consists of a 19-bit time counter field and a 1-bit flag.

The time offset is expressed in 0 to D2E (h), which is equal to the cycle offset field of IEEE 1394, and is represented by 0 to D2E (h) in units of 27 MHz streamer clock periods, and the time counter field is in units of 125 μsec (= 8 kHz). Expresses a time interval of 65 sec or less. That is, the time offset field counts up by 1 every 27 MHz clock period, counts up to D2E (h), becomes 0 at the next count, and a carry occurs to increase the time counter field by one.

If the 1-bit flag is set to '1', it indicates that the program time reference information (PCR) exists in the corresponding transport stream packet. If the 1-bit flag is set to '0', the corresponding transport stream packet does not have PCR. Only the arrival time of the time counter and time offset generated by the clock of the trimmer is recorded.

In the case of recording using the format shown in FIG. 10 of the arrival time of the transport stream, the clock synchronization compensator of the digital data stream may be configured as shown in FIG.

The counter 83 of FIG. 11 cyclically counts the clock of the 27 MHz voltage controlled oscillator 81 only to 3374 in the lower 12 bits b11 to b0.

In such a state, when digital data is output from the digital reception processor 210 of the streamer 200, the time stamp detector 71 detects the time stamp of IEEE 1394 of each transport stream packet and detects the time counter trigger 73. To pass). At this time, the time counter trigger unit 73 at the moment when the least significant bit b12 of the time counter field changes from '0' to '1' or '1' to '0' in the time stamp shown in FIG. That is, when the time of 125 µsec has elapsed) the pulse is output as shown in ① of FIG.

The output pulse of the time counter trigger unit 73 is applied to the clock terminal of the T flip-flop 75, and the T flip-flop 75 toggles the output value Q at every rising edge of the clock, and In the same manner, the divided clock of 4 kHz is input to the phase difference detector 77 at the rear stage. And, since the thirteenth output bit b12 of the counter 83 also has a frequency of 4 kHz, a signal of this bit is also applied to the phase difference detector 77. Accordingly, the phase difference detector 77 outputs an error signal according to a phase difference between two input pulse signals, that is, a clock of 27 MHz is relatively slow or fast relative to a clock of 24.576 MHz used by IEEE 1394. The gain is adjusted while passing through the low pass filter 79, and is converted into a DC voltage and applied to the voltage controlled oscillator 81. The voltage controlled oscillator 81 adjusts the oscillation frequency of 27 MHz according to the error signal.

Therefore, when the packet arrival time of the streamer 200 is recorded, a reference clock (24.576 MHz) of the time stamp is transmitted to the packet transmitted based on the time stamp of the IEEE 1394 interface added to the header of the transport stream packet (188 bytes). By recording the time of arrival of the packet with the clock (27MHz) synchronized with the C2), it is possible to prevent the time interval between the packets during the transmission and the recording from being changed by using different clock frequencies.

The method and apparatus for recording time information of a recording digital data stream according to the present invention as described above can record the time information of the recording digital data stream in correspondence with the time format of management information, thereby quickly and accurately searching without additional information. Even if the operation is performed and the digital data stream is received and recorded through the digital transmission interface, the information on the time interval between the transport streams does not change, thereby providing a stable digital playback image.

Claims (14)

In the method for receiving and recording a digital transmission stream of a predetermined unit length through a digital transmission interface, A first step of counting the reception time of the digital transport stream received in a predetermined unit length in the same manner as the clock counting method used in generating the transport stream on the basis of its own clock; A second step of generating transmission time reference information comprising a small unit time field reset when the counted value reaches a preset value and a large unit time field increasing by one unit at the time of the reset; And And generating a transport stream unit by adding the generated transmission time reference information to each of the received transport streams. The method of claim 1, And said predetermined value is a value smaller than a maximum value that can be counted by said small unit time field. The method of claim 1, And said predetermined value is a value that causes a large unit time field defined in said digital transmission interface to be synchronized with a time period of increasing by one unit. The method of claim 1, And the maximum time length represented by the large unit time field is smaller than the maximum time length of the navigation time information for accessing the transport stream unit. The method of claim 1, And wherein said third step adds only a part of said generated transmission time reference information including said small unit time field to said transport stream. The method of claim 5, The size of some transmission time reference information added in the third step is the lower 4 bytes of the entire reference information. In the method for receiving and recording a digital transmission stream of a predetermined unit length through a digital transmission interface, A first step of counting the reception time of the digital transport stream received in a predetermined unit length in the same manner as the clock counting method used in generating the transport stream on the basis of its own clock; A second step of generating transmission time reference information comprising a small unit time field reset when the counted value reaches a preset value and a large unit time field increasing by one unit at the time of the reset; A third step of generating a transport stream unit by adding the generated transmission time reference information to each of the received transport streams; And And recording a predetermined number of sets of the generated transport stream units on a recording medium as recording units. An apparatus for receiving and recording a digital transmission stream having a predetermined unit length through a digital transmission interface, Clock means for generating a clock of a frequency used in generating said transport stream; Counting means for counting the generated clock and dividing the generated clock into a small unit time field to be reset when the counted value reaches a preset value and a large unit time field to increase by one unit at the time of the reset; And When a digital transport stream having a predetermined length is received, the transport stream unit is added by adding the count values of the large unit time field and the small unit time field at the time of reception corresponding to each digital transport stream received at the predetermined unit length. A visual information recording apparatus for a digital data stream, comprising recording format structuring means for generating. The method of claim 8, And recording means for recording a predetermined number of sets of the configured transport stream unit into one recording unit on a recording medium. The method of claim 8, And said predetermined value is a value smaller than a maximum value that can be counted by said small unit time field. The method of claim 8, And the predetermined value is a value that causes a large unit time field defined in the digital transmission interface to be equal to a time period in which the unit increases by one unit. The method of claim 8, And the maximum time length represented by the large unit time field is smaller than the maximum time length of the navigation time information for accessing the transport stream unit. An apparatus for receiving and recording a digital transmission stream having a predetermined unit length through a digital transmission interface, Counting means for counting the self-clock and dividing it into a small unit time field to be reset when the counted value reaches a predetermined value and a large unit time field to increase by one unit at the time of the reset; And Upon reception of the predetermined length of the digital transport stream through the digital transport interface, the time information of the transport stream by the use clock of the digital transport interface is removed, and the count value of the counting means is added to the digital transport stream of the predetermined length. And recording format construction means for generating a transport stream unit. The method of claim 13, And recording means for collecting a predetermined number of transport stream units as a unit and recording them as one recording unit on a recording medium.