KR100531159B1 - Visual information generation and recording method of recorded digital data stream - Google Patents

Abstract

The present invention relates to a method of determining the weight of visual information of a recorded data stream when receiving a digital data stream and storing the same on a recording medium such as a digital video disk. The present invention relates to a schedule for determining a weight of visual information corresponding to a maximum transmission speed of a digital data stream recorded on a recording medium, and using the determined weight to express visual information on a mapping unit of the recorded digital data stream. After calculating the unit time, based on the calculated constant unit time, a count value of a certain unit time does not overflow in one mapping unit at the lowest bit rate of the digital data stream to be recorded. To a mapping unit for the recorded data stream. By determining the size of the corresponding time information, by generating and recording the coefficient value of a certain unit time as the time information corresponding to the mapping unit in each mapping unit for the digital data stream to be recorded, in the unit of the size of the determined time information, It is possible to minimize the data amount of the time map information adaptively to the transmission speed of the recorded digital data stream, thereby reducing the navigation data amount.

Description

Visual information generation and recording method of recorded digital data stream

When the digital data stream is received and stored in a recording medium such as a digital video disk, the present invention determines the weight of the visual information of the recorded data stream, and uses this to determine the visual information of the recorded digital data stream. It relates to a method of generating and recording.

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, After receiving the digital data stream from the set-top box and storing it in a streamer such as a digital video disc (DVD) recorder, for example, via a communication interface such as an IEEE-1394 serial bus, the stored digital Research into a system that can reproduce digital audio and video through an AV output device such as a television by editing and playing a stream and delivering the communication interface to a set-top box via a communication interface is ongoing.

In such a system, the digital data stream recorded on a recording medium such as a DVD must be generated by recording stream time map information associated with the recording stream for retrieval to use the recorded stream time map information during reproduction. Thus, the desired recorded data stream can be searched and reproduced.

Accordingly, the method of generating the stream time map information includes a recording unit (hereinafter, referred to as a mapping unit) that is a minimum unit for the recorded data stream for generating time map information. A method of dividing based on the number of recorded sectors and generating visual information corresponding to each mapping unit has been considered. The time information should be expressed as a packet arrival time for each transport stream packet constituting the data stream to the streamer. The packet arrival time is 9 bits represented by 27 MHz and 21 or more represented by 90 KHz. It must be represented by at least 4 bytes including the bits. As such, when the time information generated corresponding to each mapping unit is represented by 4 bytes or more, the data amount of the stream time map information becomes very large.

Therefore, as a method of expressing the time information with a small data amount, a method of expressing 12 bits of incremental application packet arrival time (IAPAT) information for a corresponding mapping unit has been proposed. In this method, first, a mapping unit time shift value (MTU_SHFT; time information weight) satisfying Equation 1 below is obtained.

0 ≤ 5625s2

16 ≤ MTU＿SHFT ≤ 36

(Where MAPU_SZ is the size of the mapping unit expressed as the number of sectors and is a fixed value, and max_bitrate is the maximum bit rate of the digital data stream that can be input and recorded)

The mapping unit time shift value (MTU_SHFT; time information weight) is substituted into Equation 2 to obtain the unit time IAPAT _{TIME_UNIT} of the packet arrival time increase amount IAPAT.

IAPAT＿TU =

Equation 1 is a mapping unit time shift value that has a unit time (IAPAT _{TIME_UNIT} ) of one packet arrival time increase amount within one mapping unit size (MAPU_SZ) at a maximum bit rate (max_bitrate) of an input and recorded digital data stream. This is to find (MTU_SHFT).

As shown in FIG. 1, one unit time (IAPAT _{TIME_UNIT} ) of the packet arrival time increase amount is present in the mapping unit (MAPU # 1) for the digital data stream having the maximum transmission rate. There are two or more mapping units (MAPU # 2, MAPU # i) for the following digital data streams.

When the stream time map information is constructed using this method, the mapping unit size (MAPU_SZ) and the mapping unit time shift value (MTU_SHFT) are recorded in the stream time map general information, and the mapping corresponding to each mapping unit (MAPU) is performed. If the number of IAPAT _{TIME_UNIT} of the packet arrival time increase amount corresponding to each mapping unit MAPU is recorded in the list, the desired recording data stream can be searched. That is, as the packet arrival time increasing amount information, which is a mapping list corresponding to the first mapping unit MAPU # 1 of FIG. 5, the IAPAT 1 is "2" and the packet arrival time corresponding to the second mapping unit MAPU # 2. As the increase amount information, the IAPAT 2 is " 2 ", and the IAPAT (i) is recorded as " 2 " as the packet arrival time increase amount information corresponding to the i-th mapping unit MAPU # i.

When the target search time of the i-th mapping unit (MAPU # i) is to be searched using the stream time map information recorded as described above, the first to i-th packet arrival time increase information [IAPAT (1 ), IPAAT (2),... , IAPAT (i)] cumulatively, if this cumulative value is greater than the target search time, the packet arrives at the target search time point by waiting until the target search time is found from the position iA mapping unit size (MAPU_SZ) (A). The recording data stream is read out and reproduced from the time point [MAPU_S_APAT] arrives.

However, for example, assuming that the mapping unit size (MAPU_SZ) is 32 sectors and the maximum bit rate (max_bitrate) is 10 Mbps, the recording time of 32 sectors is approximately 52.4 msec, and the mapping unit time shift value (MTU_SHFT) The unit time (IAPAT _{TIME_UNIT} ) of the packet arrival time increase amount is approximately 45 msec, so that there is one unit time (IAPAT _{TIME_UNIT} ) of the packet arrival time increase amount within the mapping unit size (MAPU_SZ) at the maximum bit rate. Done.

Here, in the case of expressing the packet arrival time increase amount information IAPAT in 12 bits, the time required to record 32 sectors of the mapping unit size (MAPU_SZ) can be expressed up to 45 msec × 2 ¹² = 184.32 sec. The bit rate of the digital data stream is approximately 0.03 Mbps.

However, in general, digital data streams, such as digital broadcast programs, are transmitted at bit rates (greater than 0.03 Mbps) that can be reproduced and output in real time. When the packet arrival time increase amount information IPAT is represented by 12 bits in the digital data stream, the data amount of time map information is increased, resulting in an increase in the amount of navigation data generated.

Therefore, the mapping unit time shift value (visual information weight) for the recording digital data stream, which can minimize the amount of data of the time map information, is determined and the visual information of the recording digital data stream is generated using the determined shift value. Development of the method is desired.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a method for generating and recording visual information of a recording digital data stream with a small data amount.

According to the present invention, there is provided a recording method of generating time information of a recording digital data stream, the method comprising: determining a weight of time information corresponding to a maximum transmission speed of a digital data stream recorded on a recording medium; ; A second step of calculating a predetermined unit time representing time information on the mapping unit of the recorded digital data stream using the determined weight value; On the basis of the calculated constant unit time, the recorded data so that the count value of the constant unit time does not overflow in one mapping unit at the lowest bit rate of the digital data stream to be recorded. Determining a size of visual information corresponding to a mapping unit for the stream; And a fourth step of generating and recording a coefficient value of a predetermined unit time as time information corresponding to the mapping unit in each mapping unit for the digital data stream to be recorded, in units of the size of the determined time information. do.

In addition, the time information generation recording method of the recording digital data stream according to the present invention comprises: a first step of determining a weight of time information corresponding to a maximum transmission speed of a digital data stream recorded on a recording medium; A second step of calculating a predetermined unit time representing time information on the mapping unit of the recorded digital data stream using the determined weight value; A third step of checking whether the calculated predetermined unit time is greater than a predetermined target unit time; Determining a size of visual information corresponding to a mapping unit for the recorded data stream according to the verification result; And a fifth step of generating and recording a coefficient value of a predetermined unit time as time information corresponding to a mapping unit in each mapping unit for the recorded digital data stream in units of the size of the determined time information. It is done.

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

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

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, in the set-top box 100, the decoder 120 decodes the broadcast program service information included in the transport stream for the broadcast program tuned by the channel selection processing unit 110 and transmits the information to the control unit 140 to the control unit 140. 140 stores the broadcast program service information in the memory 150. The broadcast program service information may include broadcast program information of all broadcast programs of all received channels, and a transmission channel number, a channel name, a broadcast program name, and a maximum transmission rate of a broadcast program may be recorded in the broadcast program service information. And a minimum transmission rate may be included.

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.

Meanwhile, when recording the digital data stream, the controller 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 of the data stream is recorded sector by sector on the recording medium together with the transport stream packet arrival time (TS APAT).

Next, with reference to Figs. 2 to 4, time information of the recording digital data stream generated and recorded by the present invention will be described.

Fig. 2 shows the configuration of the stream time map information by the method of generating and recording time information of the recording digital data stream according to the present invention. The stream time map information (STMAPI) is, for example, a digital data stream recorded on a recording medium. Generated in a single record unit or a program unit of the program, the stream time map comprising general information (STMAP_GI) and a mapping list (MAPL), wherein the mapping list is a mapping of the recorded data stream. Packet arrival time increase information (IAPAT # 1 to IPAT # n) generated and recorded corresponding to the unit.

As shown in FIG. 3, the stream time map general information STMAP_GI includes a mapping unit size (MAPU_SZ), a mapping unit time shift value (MTU_SHFT), and a mapping included in the corresponding stream time map information. The number of list entries (packet arrival time increase information), the packet arrival time (S_S_APAT) for the first packet of the recording digital data stream corresponding to the stream time map information, and the recording digital data stream corresponding to the stream time map information. The packet arrival time S_S_APAT for the last packet may be included. In the present invention, a field for recording the packet arrival time increase amount IPAT_SZ is included in the stream time map general information STMAP_GI.

The packet arrival time increase information (IAPAT # 1 to IPAT # n) is recorded in the size of the packet arrival time increase amount (IAPAT_SZ) recorded in the stream time map general information (STMAP_GI), as shown in FIG. The packet arrival time increase amount IAPAT_SZ has a constant value within one stream time map information STMAPI.

Next, a method of generating and recording time information of a recording digital data stream according to an embodiment of the present invention will be described.

In the present embodiment, a target value (IAPAT _{TU_Target} ) for the unit time IAPAT _{TIME_UNIT} of the packet arrival time increase amount IAPAT is set, and the mapping unit time shift value MTU_SHFT (time information weight) is set using Equation 1 above. The unit time IAPAT _{TIME_UNIT} of the packet arrival time increase amount IAPAT is obtained by substituting the obtained mapping unit time shift value MTU_SHFT into Equation 2.

Then, the obtained unit time (IAPAT _{TIME_UNIT)} there is the comparison with the set target value (IAPAT _{TU_Target),} wherein if the determined unit of time (IAPAT _{TIME_UNIT)} is smaller than the set target value (IAPAT _{TU_Target)} the obtained unit time (IAPAT _{TIME_UNIT} ) To generate time information such as packet arrival time increment (IAPAT). At this time, the number of allocated bits of the packet arrival time increase amount IAPAT is determined using the obtained unit time IAPAT _{TIME_UNIT} as follows. That is, the minimum integer value of m that satisfies IAPAT _{TIME_UNIT} × 2 ^m > [the recording time of one mapping unit size (MAPU_SZ) at the minimum bit rate]] is the packet arrival time increase amount, which is the number of bits allocated for the packet arrival time increase amount (IAPAT). Determine the size (IAPAT_SZ), and record the packet arrival time increase amount (IAPAT_SZ) in the stream time map general information.

On the other hand, the obtained unit time (IAPAT _{TIME_UNIT)} is greater than the set target value (IAPAT _{TU_Target)} the determined unit of time (IAPAT _{TIME_UNIT)} is the set target value (IAPAT _{TU_Target)} mapping until less than the unit time shift value (MTU_SHFT ) Is decreased by 1 and the unit time smaller than the set target value IAPAT _{TU_Target} is obtained, and time information such as the packet arrival time increase amount IAPAT is generated using the obtained unit time IAPAT _{TIME_UNIT} . Also at this time, using the obtained unit time (IAPAT _{TIME_UNIT} ), the packet arrival time is obtained by using a minimum integer value of m satisfying IAPAT _{TIME_UNIT} × 2 ^m > [the recording time of the mapping unit size (MAPU_SZ) at the minimum bit rate]]. The amount of increase (IAPAT_SZ) is determined, and the packet arrival time increase amount (IAPAT_SZ) is recorded in the stream time map general information.

In order to help the understanding of the embodiment according to the present invention described above, a specific example will be described with reference to FIG. 1. Here, it is assumed that one mapping unit size (MAPU_SZ) is set to 32 sectors and the unit time target value (IAPAT _{TU_Target} ) is set to 40 msec. On the other hand, it is assumed that the minimum bit rate min_bitrate and the maximum bit rate max_bitrate of the digital data stream to be recorded are included in the broadcast program service information.

First, when a user request to record a digital data stream such as a digital broadcast signal selected and input by the channel selection processing unit 110 on a recording medium is input, the control unit 140 of the set-top box 100 receives an IEEE 1394 communication interface ( The controller 250 of the streamer 200 notifies that the current recording mode is set through the 130 and 210, and transmits the received input data stream to the streamer 200 through the communication interface 130 or 210. At the same time, the control unit 140 of the set-top box 100 extracts the service information for the data stream currently recorded from the broadcast program service information recorded in the memory 150 and transmits the service information to the streamer 200. Here, the service information includes the maximum bit rate and the minimum bit rate of the currently recorded digital data stream.

The controller 250 of the streamer 200 controls the data stream input through the IEEE 1394 communication interface 130 or 210 to be recorded on the recording medium 230 by the storage stream processor 220. In addition, the controller 250 checks the maximum bit rate and the minimum bit rate in the service information transmitted from the set-top box 100. Here, it is assumed that the minimum bit rate min_bitrate is 1 Mbps and the maximum bit rate max_bitrate is 10 Mbps.

The controller 250 obtains the mapping unit time shift value MTU_SHFT to 28 using Equation 1, and obtains the unit time IAPAT _{TIME_UNIT} to approximately 46 msec using Equation 2. Since the obtained unit time IAPAT _{TIME_UNIT} is greater than the unit time target value IAPAT _{TU_Target} , the control unit 250 sets the mapping unit time shift value MTU_SHFT to 27 by decreasing 1 to Equation 2. Get unit time (IAPAT _{TIME_UNIT} ) to approximately 23msec. In this case, since 23 msec, which is the obtained unit time IAPAT _{TIME_UNIT} , is smaller than the unit time target value IAPAT _{TU_Target} , the controller 250 determines this value as the unit time IAPAT _{TIME_UNIT} .

Thereafter, the controller 250 uses the obtained unit time (IAPAT _{TIME_UNIT} ), 23 msec, to satisfy 23 msec × 2 ^m > [520 msec, which is a recording time of a mapping unit size (MAPU_SZ; 32 sectors) at 1 Mbps]. Returns the minimum integer value of. At this time, the minimum integer value of m is “5”, and the controller 250 determines the obtained value “5” as the packet arrival time increase amount (IAPAT_SZ; number of bits), and this packet arrival time increase amount (IAPAT_SZ). ) Is recorded in the stream time map general information as shown in FIG. 3 stored in the memory 260 together with the mapping unit size (MAPU_SZ; 32 sectors) and 27 as the obtained mapping unit time shift value (MTU_SHFT). .

Subsequently, the controller 250 counts the number of unit times IAPAT _{TIME_UNIT} in units of mapping unit size (MAPU_SZ; 32 sectors) for the recorded digital data stream using 23 msec, which is the obtained unit time IAPAT _{TIME_UNIT} . (count) is expressed as a packet arrival time increase amount (IAPAT_SZ; 5 bits) as shown in FIG. 4, and is generated as packet arrival time increase amount information (IAPAT # i) as shown in FIG. The data is recorded in the stream time map information (STMAPI) stored at 260.

On the other hand, one mapping unit size (MAPU_SZ) is set to 32 sectors and the unit time target value (IAPAT _{TU_Target} ) is set to 40 msec, the minimum bit rate (min_bitrate) of the input and recorded digital data stream is 1 Mbps, and the maximum bit rate (max_bitrate). The case where) is 12Mbps will be described.

The control unit 250 obtains the mapping unit time shift value MTU_SHFT from Equation 1 as 27, and obtains the unit time IAPAT _{TIME_UNIT} from Equation 2 as approximately 23 msec. Since the obtained unit time IAPAT _{TIME_UNIT} is smaller than the unit time target value IAPAT _{TU_Target} , the controller 250 determines the obtained value 23 msec as the unit time IAPAT _{TIME_UNIT} .

Thereafter, the controller 250 obtains the minimum integer value of m satisfying 23 msec x 2 ^m > 520 msec as "5" using the obtained unit time IAPAT _{TIME_UNIT} as 23 msec. Determined by the arrival time increase amount (IAPAT_SZ; number of bits).

Subsequently, the controller 250 stores the packet arrival time increase amount IAPAT_SZ 5 in the memory 260 together with the mapping unit size MAPU_SZ (32 sectors) and the obtained mapping unit time shift value MTU_SHFT 27. 3, stored in the stream time map general information as shown in FIG.

Next, the controller 250 maps units in size with respect to the digital data stream using a 23msec the obtained unit time (IAPAT _{TIME_UNIT),} recording; the number of (MAPU_SZ 32 sectors) unit time (IAPAT _{TIME_UNIT)} in units The counted value is expressed as a packet arrival time increase amount (IAPAT_SZ; 5 bits) as shown in FIG. 4, and is generated as packet arrival time increase amount information (IAPAT # i) as shown in FIG. It is recorded in the stream time map information (STMAPI) stored in.

Next, a method of generating and recording time information of a recording digital data stream according to another embodiment of the present invention will be described.

In the present exemplary embodiment, a mapping unit time shift value (MTU_SHFT; time information weight) is set using Equation 1 above without setting a target value (IAPAT _{TU_Target} ) for the unit time IAPAT _{TIME_UNIT} of the packet arrival time increase amount IAPAT. Substitute the mapping unit time shift value MTU_SHFT into Equation 2 to obtain the unit time IAPAT _{TIME_UNIT} of the packet arrival time increase amount IAPAT. Using the obtained unit time IAPAT _{TIME_UNIT} , time information such as an IAPT is increased.

In this case, the number of allocated bits of the packet arrival time increase amount IAPAT is determined using the obtained unit time IAPAT _{TIME_UNIT} as follows. That is, the minimum integer value of m that satisfies IAPAT _{TIME_UNIT} × 2 ^m > [the recording time of one mapping unit size (MAPU_SZ) at the minimum bit rate]] is the packet arrival time increase amount, which is the number of bits allocated for the packet arrival time increase amount (IAPAT). Determine the size (IAPAT_SZ), and record the packet arrival time increase amount (IAPAT_SZ) in the stream time map general information.

Specific examples will be described with reference to FIG. 1 to help understand the above-described other embodiments according to the present invention. That is, it is assumed that one mapping unit size (MAPU_SZ) is 32 sectors, the minimum bit rate min_bitrate is 1 Mbps, and the maximum bit rate max_bitrate is 10 Mbps.

The controller 250 of the streamer 200 obtains the mapping unit time shift value MTU_SHFT to 28 using Equation 1, and calculates the unit time IAPAT _{TIME_UNIT} to approximately 46 msec using Equation 2. . Thereafter, the controller 250 obtains the minimum integer value of m satisfying 46 msec × 2 ^m > 520 msec as “4” using 46 msec, which is the obtained unit time (IAPAT _{TIME_UNIT} ), and obtains the value “4” as the packet arrival. Determined by the amount of time increment (IAPAT_SZ; number of bits).

Subsequently, the controller 250 stores the packet arrival time increase amount IAPAT_SZ as 4 in the memory 260 together with the mapping unit size MAPU_SZ (32 sectors) and the obtained mapping unit time shift value MTU_SHFT 28. It is recorded in the stored stream time map general information as shown in FIG.

Next, the controller 250 maps units in size with respect to the digital data stream using a 46msec the obtained unit time (IAPAT _{TIME_UNIT),} recording; the number of (MAPU_SZ 32 sectors) unit time (IAPAT _{TIME_UNIT)} in units The counted value is expressed as a packet arrival time increase amount (IAPAT_SZ; number of bits) as shown in FIG. 4, and is generated as packet arrival time increase amount information (IAPAT # i) as shown in FIG. It is recorded in the stream time map information (STMAPI) stored in.

In the state in which time map information is recorded by the method of generating time information of the recorded digital data stream according to the present invention, the target search of the i th mapping unit MAPU # i is performed using the recorded stream time map information as described above. A case of searching for time (Target Search Time) will be described.

First, the controller 250 reads the packet arrival time increase amount (IAPAT_SZ; the number of bits) of the stream time map general information STMAP_GI from the stream time map information STMAPI stored in the memory 260, and thereby increases the packet arrival time increase amount information. Check the number of bits in (IAPAT).

Thereafter, the control unit 250 determines the first to i th packet arrival time increase amount information [IAPAT (1), IPAAT (2),..., In units of the identified number of bits. , IAPAT (i); 5], and information on the packet arrival time increase amount read out (IAPAT (1), IPAAT (2), ...). , IAPAT (i)] cumulatively, if this cumulative value is greater than the target search time, the packet arrives at the target search time point by waiting until the target search time is found from the position iA mapping unit size (MAPU_SZ) (A). The recording data stream is read out and reproduced from the time point [MAPU_S_APAT] arrives.

According to the method for generating time information of the recording digital data stream according to the present invention as described above, for each stream time map information (STMAPI), it is possible to express the time information for the digital data stream recorded at the minimum transmission rate. The packet arrival time increase amount (IAPAT_SZ; number of bits) is set differently and recorded. Therefore, the data amount of time map information can be minimized adaptively to the transmission speed of the recording digital data stream, thereby reducing the amount of navigation data. As a result, a small amount of memory can be used in terms of the system.

1 schematically shows a system to which a method of generating and recording time information of a recording digital data stream according to the present invention is applied,

Fig. 2 shows the structure of the stream time map information by the time information generation and recording method of the recording digital data stream according to the present invention.

FIG. 3 illustrates an embodiment of the configuration of the stream time map general information of FIG. 2;

FIG. 4 illustrates an embodiment of the configuration of the packet arrival time increase amount information of FIG. 2.

FIG. 5 is a diagram for explaining the time information generated by the time information generation and recording method of the recording digital data stream.

※ 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 (12)

Determining a weight of visual information corresponding to a maximum transmission speed of a digital data stream recorded on a recording medium; A second step of calculating a predetermined unit time representing time information on the mapping unit of the recorded digital data stream using the determined weight value; On the basis of the calculated constant unit time, the recorded data so that the count value of the constant unit time does not overflow in one mapping unit at the lowest bit rate of the digital data stream to be recorded. Determining a size of visual information corresponding to a mapping unit for the stream; And And a fourth step of generating and recording a coefficient value of a predetermined unit time as visual information corresponding to the mapping unit in each mapping unit for the digital data stream to be recorded, in units of the size of the determined visual information. Visual information generation and recording method of a recording digital data stream. The method of claim 1, The first step, 0 ≤ 5625s2 ³⁴ s ^weights s -1 ≺ One Where MAPU_SZ is the size of the mapping unit for the recorded data stream, max_bitrate is the maximum data rate of the data stream) Time information generation recording method of the recording digital data stream, characterized in that it determines a weight that satisfies. The method of claim 1, The predetermined unit time is, And obtaining the weight information based on the ^weight s ²⁰ . The method of claim 1, And a fifth step of recording the determined size of the time information as recording unit information of the time information corresponding to the mapping unit. The method of claim 1, And additionally recording the weight information of the predetermined unit time. Determining a weight of visual information corresponding to a maximum transmission speed of a digital data stream recorded on a recording medium; A second step of calculating a predetermined unit time representing time information on the mapping unit of the recorded digital data stream using the determined weight value; A third step of checking whether the calculated predetermined unit time is greater than a predetermined target unit time; Determining a size of visual information corresponding to a mapping unit for the recorded data stream according to the verification result; And And a fifth step of generating and recording a coefficient value of a predetermined unit time as visual information corresponding to the mapping unit in each mapping unit for the recorded digital data stream in units of the size of the determined visual information. Time information generation recording method of a recording digital data stream. The method of claim 6, The first step, 0 ≤ 5625s2 ³⁴ s ^weights s -1 ≺ One Where MAPU_SZ is the size of the mapping unit for the recorded data stream, max_bitrate is the maximum data rate of the data stream) Time information generation recording method of the recording digital data stream, characterized in that it determines a weight that satisfies. The method of claim 6, The predetermined unit time is, And obtaining the weight information based on the ^weight s ²⁰ . The method of claim 6, The fourth step, In the third step, when it is determined that the calculated constant unit time is equal to or less than a predetermined target unit time, in one mapping unit at the lowest bit rate of the recorded digital data stream based on the calculated constant unit time. And determining the size of the time information corresponding to the mapping unit for the recorded data stream so that the coefficient value of the predetermined unit time does not overflow in the recording digital data stream. The method of claim 6, The fourth step, When it is confirmed in the third step that the calculated predetermined unit time is greater than the predetermined target unit time, A first step of reducing the weight of the determined visual information by 1 and recalculating a predetermined unit time representing visual information on the mapping unit of the recordable digital data stream using the reduced weight; And Based on the recalculated constant unit time, mapping to the recorded data stream such that a coefficient value of a predetermined unit time does not overflow in one mapping unit at the lowest bit rate of the recorded digital data stream. And a second sub-step of determining the size of the time information corresponding to the unit. The method according to claim 9 or 10, And a sixth step of recording the determined size of the time information as recording unit information of the time information corresponding to the mapping unit. The method according to claim 9 or 10, And additionally recording the weight information of the predetermined unit time.