KR0170732B1 - Recording/reproducing method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video tape recording apparatus, and more particularly, to digital video tape recording and reproducing apparatus for recording and reproducing ATV (Advanced Television) and DVB (Digital Video Broadcasting) signals. To record and play back.

For the purpose of the present invention, a first outer code error correction encoding step of external error correction encoding by adding external parity to a separate error correction region for some video data independently of trick data of a video data region of a predetermined digital format And a second outer code error correction encoding step of adding outer parity to the outer parity region and performing external error correction encoding on the remaining video data independently of the trick data of the video data region.

According to the present invention, when the external coding of the SD-VCR, an additional external code area (ECC3) is allocated to the SD-VCR for the ATV and DVB signals, and the existing external code is corrected to divide the parity of the additional external code area by parity. There is an effect of increasing the error correction rate for the data.

Description

Digital Video Tape Recording and Playback Method

1 is a block diagram according to an embodiment of a digital video tape recording apparatus according to the present invention.

2 shows a video area of a digital video tape having a recording format of an SD-VCR.

3 is a diagram for explaining an example of data arrangement for recording on a digital video tape.

4 is a diagram for explaining another example of data arrangement for recording on a digital video tape.

5 is a diagram for explaining a first external error correction encoding performed by the first external error correction encoding unit shown in FIG.

6 is a diagram for explaining the structure of an MPEG-2 transport packet.

7 and 8 are diagrams for explaining the two-to-five mapping applied to the present invention.

FIG. 9 is a diagram for explaining a second external error correction encoding performed by the second external error correction encoding unit shown in FIG.

FIG. 10 is a diagram for explaining internal error correction coding performed by the internal error correction coding unit shown in FIG.

11 is a block diagram according to an embodiment of a digital video tape reproducing apparatus according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video tape recording apparatus, and more particularly, to digital video tape recording and reproducing apparatus for recording and reproducing ATV (Advanced Television) and DVB (Digital Video Broadcasting) signals. To record and play back.

Development of consumer digital video cassette players (hereinafter referred to as DVCR) for recording and reproducing ATV signals and DVB signals on digital video tapes is in progress.

In particular, in the SD (Standard Definition) -VCR for recording and reproducing ATV signals, research on a recording format for special reproduction that satisfies image quality and cost has continued. When this ATV signal is transmitted to the SD-VCR, it is transmitted as a transport packet having an MPEG-2 structure proposed by the Moving Picture Experts Gruop (MPEG).

On the other hand, the SD-VCR signal is intra frame coded data and has an ECC (Error Correction Code) structure. In ECC, the code in the column direction is called an internal code and is represented by (85,8), and the code in the row direction is called an external code and is represented by (149, 11).

When writing, external error correction code is performed by adding 11 bytes of external additional information to 138 bytes of external code in the row direction, and 8 bytes of internal additional information is added to 77 bytes of internal code in the column direction to correct internal errors. Encode

During playback, after correcting up to 4 bytes out of the 85 bytes, an incorrect sync block is sent with an error flag, and the error correction and decoding process is performed. Correct to byte.

In the SD-VCR signal, one frame is segmented into five segments, one macroblock is collected in each segment, and the bit amount of the track is fixed in units of five macroblocks. Since the bit amount is fixed, trick play was possible.

On the other hand, the ATV or DVB signal has an MPEG-2 structure and is inter frame coded, and a video sector on a tape having a recording format of SD-VCR has a normal playback data area for normal playback data and trick playback data. And data playback area for trick play exist separately.

Here, since inter-frame coding encodes the difference between adjacent frames only in units of 1 GOP (usually 15 frames), when an error occurs in one frame, an error occurs in almost all frames in the corresponding GOP. .

Therefore, in the SD-VCR recording and reproducing the ATV or DVB signal, since the ATV or DVB signal is inter-frame coded, there is a problem of being fatally damaged when an error occurs in the normal reproduction data of the ATV or DVB signal.

Accordingly, an object of the present invention is to provide a digital video tape recording method for allocating an additional outer code area to an SD-VCR and dividing a range corrected by an existing external call by parity of the additional outer code area to increase error correction of normal playback data. There is.

It is another object of the present invention to provide a digital video tape playback method which increases error correction of normal playback data by allocating an additional outer code area to an SD-VCR and dividing a range corrected by an existing external call with the parity of the additional outer code area. There is.

It is still another object of the present invention to allocate an additional external code area to an SD-VCR to divide a range corrected by an existing external call by parity of the additional external code area, thereby improving error correction of normal playback data. To provide.

In order to achieve the above object, the present invention divides an inter coded digital video signal including picture data supplied at predetermined intervals and independently decodable into a normal video data area and a trick data data area to be recorded on a digital video tape. In the way,

Separating normal and trick play data into normal data and trick play data in the transmitted signal;

First external code error in which the external error correction coding is performed by adding an external parity to a separate error correction area for some video data independently of the trick data of a video data area of a predetermined digital format in the normal and trick reproduction data separation step. Correction encoding step;

A second outer code error correction encoding step of adding outer parity to an outer parity region for the remaining video data independently of the trick data of the video data region in the first outer code error correction encoding step;

An inner code error correction encoding step of performing inner code error correction encoding on each of the normal reproduction data and the trick reproduction data encoded by the error correction encoding in the second outer code error correction encoding step;

And a recording step of modulating the normal reproduction data and the trick reproduction data encoded by the error correction encoding in the internal code error correction encoding step, and recording them at a predetermined position of each track on the tape.

In another aspect of the present invention, there is provided a tape reproducing method for reproducing normal reproduction data and trick reproduction data of a digital video recorded in a video sector on a digital video tape.

An inner code error correction decoding step of decoding the inner code error correction on the reproduced normal reproduction data and the trick reproduction data, respectively;

A first outer code error correction decoding step of performing external error correction decoding on some video data by external parity of a separate error correction region independently of trick data of a video data region of a predetermined digital format in the inner code error correction decoding step; ;

A second outer code error correction encoding step of performing outer error correction encoding on the remaining video data by the outer parity of the outer parity region independently of the trick data of the video data region in the first outer code error correction decoding step;

And a combination of normal and trick reproduction data outputting an ATV signal by combining the error correction decoding normal reproduction data and the trick reproduction data in the second outer code error correction decoding step. .

In order to achieve the above object, the present invention provides a digital video signal by dividing an intercoded digital video signal including picture data supplied at predetermined intervals and independently decodable into a normal reproduction data region and a trick reproduction data region. In the method of recording and playing on a video tape,

Separating normal and trick play data into normal data and trick play data in the transmitted signal;

First external code error in which the external error correction coding is performed by adding an external parity to a separate error correction area for some video data independently of the trick data of a video data area of a predetermined digital format in the normal and trick reproduction data separation step. Correction encoding step;

A second outer code error correction encoding step of adding outer parity to an outer parity region for the remaining video data independently of the trick data of the video data region in the first outer code error correction encoding step;

An inner code error correction encoding step of performing inner code error correction encoding on each of the normal reproduction data and the trick reproduction data encoded by the error correction encoding in the second outer code error correction encoding step;

A recording step of modulating the normal reproduction data and the trick reproduction data encoded by the error correction encoding in the internal code error correction encoding step, and recording them on a predetermined position of each track on the tape;

An internal code error correction decoding step of decoding internal code error correction on the normal reproduction data and the trick reproduction data reproduced on the digital tape, respectively;

A first outer code error correction decoding step of performing external error correction decoding on some video data by external parity of a separate error correction region independently of trick data of a video data region of a predetermined digital format in the inner code error correction decoding step; ;

A second outer code error correction encoding step of performing outer error correction encoding on the remaining video data by the outer parity of the outer parity region independently of the trick data of the video data region in the first outer code error correction decoding step;

Recording and reproducing a digital video tape comprising a normal and trick reproduction data combination step of outputting an ATV signal by combining the error correction decoded normal reproduction data and trick reproduction data in the second outer code error correction decoding step. Way.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram according to an embodiment of a digital videotape recording apparatus according to the present invention, in which a preprocessing unit 10 for separating transport packets from transport packets, and normal and tricks for separating normal playback data and trick playback data Reconstruction data separation section 20, a mixing section 30 for mixing a sync signal and an identification code, a first outer code ECC device 41 and a second outer code ECC device 42, the outer code correction encoding An outer code error correction encoder 40, an inner code ECC unit 50 for inner code error correction coding, and a modulator 60 for modulating the signal to record on a tape.

2 shows a video area of a digital video tape having a recording format of an SD-VCR.

2 shows 19-20 sync blocks n of the first video auxiliary data area 230, 21-155 sync blocks of the MPEG data area 240, and 156 sync blocks of the second video auxiliary data area 250. It consists of 157-167 sink blocks, which are external additional information areas 260.

Each sync block is composed of a 2-byte sync area 210, a 3-byte identification code 220, 77-byte data, and 8-byte internal code error correction internal side information 270.

3 is a diagram for explaining an example of data arrangement for recording on a digital video tape.

The ECC blocks shown in FIG. 3 are the 19-20 sink blocks as the first video auxiliary data area 330, the 21-30 sink blocks as the error correction (ECC3) area 340 of the normal playback data area, and the normal. 31-130 sync blocks as the playback data area 350, 131-155 sync blocks as the trick playback data area 360, 156 sync blocks as the second video auxiliary data area 370, and external additional information area ( 380) of 157-167 sink blocks.

Each sync block is composed of a 2-byte sync area 310, a 3-byte identification code 320, 77-byte data, and 8-byte internal code error correction internal side information 390.

4 is a diagram for explaining an example of data arrangement for recording on a digital video tape.

4, the ECC block structure shown is distributedly arranged in k forms of a trick play data area. Where M, N, m, k0

The ECC block structure shown in FIG. 4 includes N-20 sync blocks, which are the first video auxiliary data area 422, the 19-20 sink blocks, and the first to k-th trick play data areas 428, 432, and 436. The first to mth normal reproduction data areas 426, 430, 434, and 438, which are the error correction (ECC3) area 424 of the reproduction data area, are all M-byte sync blocks and the second auxiliary data area. 156 sink blocks (440) and 157-167 sink blocks (442). Where m1 + m2 + .... + mm = M, n1 + n2 + ..... + nK = N.

Each sync block is composed of a 2-byte sync area 410, a 3-byte identification code 420, 77-byte data, and 8-byte internal code error correction internal additional information 450.

5 is a diagram for explaining a first external error correction encoding performed by the first external error correction encoding unit shown in FIG.

The ECC block shown in FIG. 5 includes 19-20 sync blocks as the video auxiliary data area 530, 21-30 sync blocks as the error correction (ECC3) area 540 in the normal play and trick data areas, and normal play. And 31- (2 + 5 × P + 10) sync blocks, which are data zones 550 for trick and trick reproduction.

Each sync block is composed of a 2-byte sync area 510 and a 3-byte identification code 520.

6 is a diagram for explaining the structure of an MPEG-2 transport packet.

7 and 8 are diagrams for explaining the two-to-five mapping applied to the present invention.

FIG. 9 is a diagram for explaining a second external error correction encoding performed by the second external error correction encoding unit shown in FIG.

The ECC block shown in FIG. 9 is the 19- (2 + 5 × P + 10) sink blocks 930 of FIG. 5, the data area 940 for normal play and trick play, and one sync block. Area 950, consisting of 12 + 5 × q sync blocks consisting of an outer parity area 960, which is an 11 sync block.

Each sync block is composed of a 2-byte sync area 910 and a 3-byte identification code 920.

FIG. 10 is a diagram for explaining internal error correction coding performed by the internal error correction coding unit shown in FIG.

The ECC blocks shown in FIG. 10 are 19-20 sink blocks as the first video auxiliary data area 130, 21-30 sink blocks as the error correction (ECC3) area 140 of the normal playback data area, and normal. And 31-155 sink blocks as the trick data reproducing data area 150, 156 sink blocks as the second video auxiliary data area 160, and 157-167 sink blocks as the external additional information area 170.

Each sync block is composed of a 2-byte sync area 110, a 3-byte identification code 120, 77-byte data, and 8-byte internal code error correction internal additional information 180.

11 is a block diagram according to an embodiment of a digital video tape reproducing apparatus according to the present invention, a demodulator 1110 for demodulating a signal recorded on a tape, and an inverse internal code ECC unit 1120 for error correction decoding of an internal code. And an outer second error code ECC unit 1131 and an inverse first outer code ECC unit 1132 for correcting and decoding the outer code, the outer code error correction decoding unit 1130 for separating the sync signal and the identification code Separation unit 1140, normal and trick reproduction data combination unit 1150 for combining normal reproduction data and trick reproduction data, reverse preprocessing for outputting an ATV or DVB signal by transferring the reproduced normal reproduction data and trick reproduction data into packets. It is composed of a unit (1160).

Specific embodiments of the present invention will be described in detail with reference to FIGS. 1 to 11.

1 shows a block diagram of an encoder according to the present invention.

The signal input here has an MPEG2 transport packet structure in the interframed signal in the MPEG2 structure.

First, the preprocessor 10 receiving image data is separated into a transport layer in a transport packet structure and transmitted.

The data in the transport packet includes video, audio, user data and the like, but the present invention handles only video data. A VCR for recording an ATV or DVB signal is composed of side information (user data), video data and audio data on a transport layer from an MPEG2 signal. The video data has an MPEG2 structure.

Since the VCR has a trick play function, it extracts trick play data from the transmitted MPEG2 video data. In addition, the trick play data is composed of the MPEG2 video structure and the transport packet structure and must be recorded on the tape.

The normal / trick playback data separator 20 separates and transmits trick data from the input MPEG2 video data. A VCR that records an ATV or DVB signal is data in which the input data is internally coded in units of 1 GOP.

In general, a signal composed of these data types can be coded independently using intra frame data (I) that can be independently coded without any other picture data, and can be coded using motion compensation from preceding intra frame data or predicated frame data. Frame data (P), and bidirectional predicted frame data (B) which can be coded using motion compensation from preceding intra frame data or predicted frame data and subsequent intra frame data or predicted frame data. do.

One embodiment of the display reproduction order of the ATV signal specified in MPEG-2 is I-B-B-P-B-B-P-B-B-P-B-B-P ---, and the order of the transmission bit sequences is I-P-B-B-P-B-B-P-B-B-P-B-B ---.

Therefore, the trick play data is selected and used independently of the intra frame data that can be coded. Among intra frames, only a few coefficients per DCT block (typically one DC coefficient and 1-2 AC coefficients per block) are taken and transmitted in an MPEG-2 structure.

The trick play data recorded in the video sector is used by selecting intra frame data.

The trick play data is obtained from the video data configured in this form, and the data from the intra frame is extracted to reduce hardware complexity. Among intra frame data, only a few coefficients per block are taken and transmitted in the MPEG2 structure.

The video area of the SD-VCR is recorded in the format shown in FIG. 2, but the ATV signal is divided into the video areas as shown in FIG. 3 and 4, trick regions 360, 428, 432, and 436 exist, and ECC3 regions 340 and 424 also exist. The ECC3 regions 340 and 424 are vulnerable to errors since MPEG2 is an inter coded bit stream. Therefore, SD-VCR needs additional error correction code in addition to error correction code.

The mixing unit 30 mixes the sync code (Sync) and the identification code (ID) to the normal play and trick play data output from the normal / trick play data separation unit 20. Also, as in FIG. 4 and FIG. 5, normal data and trick data are input separately.

The outer code error correction encoder 40 and the inner code error correction encoder 50 perform error correction on the data output from the mixing unit 30. The code used for error correction coding is a two-dimensional Reed-Solomon code (RS Code). The primitive polynomial of error correction code is, for example, P (x) = x ⁸ + x ⁴ + x ³ + x ² +1.

The outer code error correction encoder 40 has two first outer code error correction encoders 41 and a second outer code error correction encoder 42. An example of the generation polynomial of the first outer code error correction encoder 41 is g (x) = (x + 1) (x + α) (x + α ² ) ... (x + α ¹⁰ ) and the second outer The generation polynomial of the call error correction encoder 42 is g (x) = (x + 1) (x + α) (x + α ² ) ... (x + α ⁹ ).

The error correction code added in addition to the error correction code of the SD-VCR is a structure of (2 + 5 × P + 10, 2 + 5 × P) as shown in FIG. 5 by the first outer code error correction encoder 41. This structure has 10 parities (P0 integer).

The first outer code may be implemented as shown in FIG. 5, and the first outer code may be implemented by replacing 0 or arbitrary pattern data with a trick area instead of trick data. Since this is for error correction occurring in normal data, the ability to correct normal data at the time of the first encoder and decoder can be improved by replacing 0 or arbitrary data instead of trick data.

In the bit stream of the MPEG-2 transport packet structure, only the MPEG-2 video data stream is input with reference to the packet header PID (Packet ID). At this time, since the MPEG-2 video data stream is input as a packet of 188 bytes, as shown in FIG. 6, a sync of 1 byte is separated from a packet of 188 bytes. Are collected and formatted into five sync blocks as shown in FIG.

Here, when the ATV signal or the DVB signal is input to the ATV-VCR or the DVB-VCR through the transmission path, respectively, the ATV signal or the DVB signal is inputted as a transport packet having an MPEG-2 structure as shown in FIG.

That is, the data on the transmission path has a system layer structure of MPEG-2, and this system layer structure has a packet structure of 188 bytes as shown in FIG. In FIG. 6, four-byte head information includes one-byte sink and three-byte side information. Here, the number of bytes of the head information may vary. The payload of the packet except for the head information includes video data, audio data, or user data. Video data is compressed.

The reason for separating the 1 byte sink as shown in FIG. 6 in the transmission packet of 188 byte is that the sync code for the packet is added because the sync code and ID are added to each sync block in the mixing unit 30 of FIG. This is to secure more pure data area since it becomes unnecessary data during recording.

As shown in FIG. 7, there are two transmission packets of 187 bytes and head information added to each transmission packet in five sync blocks of 77 bytes. Here, mapping two transmission packets to five sink blocks is generally referred to as two-to-five mapping, and the mapped five sink blocks are referred to as reference blocks.

Accordingly, FIG. 5 adds 10 parity of the ECC3 540 by using 5 × P sync blocks of the normal data and the trick data 550 and 2 sync blocks of the video auxiliary data 530 as pure data. In the trick area, 0 or arbitrary pattern data can be substituted. P of 2 + 5 x P + 10 blocks is a positive integer, and 5 is 5 sync blocks of the SD standard.

Next, the second outer code error correction encoder 42 uses the error correction code structure of SD as shown in FIG. That is, the SD structure of FIG. 9 includes a block 930 of 2 + 5 × P + 10, a 5 × q sync block of normal data and trick data 940, a 1 sync block of video auxiliary data 950, and an external parity. 11 sync blocks are composed of 12 + 5 × q of pure data. Here, P, q is a positive integer and P + q = 25 (for example, p is 12 and q is 13).

However, in the second outer code error correction encoder 42, a 2 + 5 × P + 10 size block implemented by the first outer code error correction encoder 41 is shown in FIG. 7 with 0 or predetermined pattern data. The outer code error correction is performed in the structure of (149, 138) which is the structure of the SD as described above. In addition, by replacing zero or predetermined pattern data in a trick area of (12 + 5 × q), error correction capability of normal data can be improved.

Therefore, when the outer code correction is performed as in the first outer code error correction encoder 41 and the second outer code error correction encoder 42, the correction capability of the normal reproduction data is doubled. In other words, the additional outer code area ECC3 is allocated to the SD VCR to divide the range corrected by the existing external code (external code parity) from the parity ECC3 of the additional area. For example, if the bit error rate is 10 ^-2 , if the error correction structure of the first outer code error correction encoder 41 is a (138,128) structure excluding 11 external parities according to the SD standard, the probability of not correcting is 1.5 ×. 10 ^−15, but in the case of the present invention, 1.3 × 10 ⁻²⁰ .

In particular, in FIG. 5 and FIG. 9, when the outer code coding is performed with 0 or predetermined pattern data in the trick areas 540 and 940, the correction capability for the normal data is doubled.

In this case, the first outer code error correction encoder 41 and the second outer code error correction encoder 42 may be reversed.

The inner code error correction encoder 50 replaces the 2 + 5 × P + 10 sized block 930 filled with 0 in FIG. 9 with the size of 2 + 5 × P + 10 in FIG. Fill with block 550 and code the inner code as in SD.

Next, as shown in FIG. 10, an internal parity 180, which is 8 bytes of internal side information, is added to 77 bytes of data as in the conventional method. Here, the inner code generation polynomial of the inner code error correction coding unit 50 is g (x) = (x + 1) (x + α) (x + α ² ) ... (x + α ⁷ ).

The image data corrected by the error correction encoders 40 and 50 are signal modulated by the modulator 60 and recorded on the tape.

11 is a block diagram according to an embodiment of a digital video tape data reproducing apparatus according to the present invention.

The reproduction apparatus shown in FIG. 11 reproduces data from the digital video tape in the reverse order of the recording apparatus shown in FIG.

The demodulator 1110 demodulates the data reproduced from the tape. The inverse internal code error correction encoder 1120 decodes the internal code error correction for the trick reproduction data and the normal reproduction data reproduced by the demodulator 1110, respectively. In addition, the inverse second outer code error correction decoder 1131 replaces the reproduced 2 + 5 × P + 10 block area with 0 or a predetermined pattern and is independent of the trick data in 12 + 5 × q blocks of video data. The external error correction decoding is performed by the external parity 960 of the external parity region of FIG.

In addition, when the external error correction decoding is performed together with the normal reproduction data by replacing 0 or predetermined pattern data with the trick reproduction data area of the 12 + 5 × q block, the correction capability for the normal reproduction data is doubled.

The inverse first outer code error correction decoder 1132 is independent of the trick data for the video data of the 2 + 5 × P + 10 block region error corrected and decoded by the inverse second outer code error correction decoder 1131. The outer error correction coding is performed by the outer parity 540 of the additional outer code region ECC3 shown in FIG.

Further, if the external error correction decoding is performed together with the normal reproduction data by replacing 0 or predetermined pattern data with the trick reproduction data area of 2 + 5xq + 10 blocks, the correction capability for the normal reproduction data is doubled. The separation unit 1140 separates the sync code and the identification code from the error correction decoded normal reproduction and trick reproduction data output from the error correction decoding units 1130 and 1120. The separated identification code is entered in 1150 blocks.

The normal / trick play data combination unit 1150 separates the normal play and trick play data using the sync code and the identification code output from the separating unit 1140, and then plays the normal play data and the trick play according to the normal play mode or the trick play mode. The data is recombined, and the combined normal reproduction and trick reproduction data are transmitted into packets by the reverse preprocessing unit 1160 to output an ATV or DVB signal.

As described above, according to the present invention, when the external coding of the SD-VCR, an additional external code area (ECC3) is allocated to the SD-VCR for the ATV and DVB signals, and the parity of the additional external code area is corrected. By sharing with, it is effective to increase the error correction rate for the reproduction data.

Claims (13)

A method of dividing an intercoded digital video signal including picture data supplied at predetermined intervals and independently decodable into a normal reproduction data area and a trick reproduction data area and recording on a digital video tape, the method comprising: A normal and trick play data separation step of separating the normal data and the trick play data; First external code error in which the external error correction coding is performed by adding an external parity to a separate error correction area for some video data independently of the trick data of a video data area of a predetermined digital format in the normal and trick reproduction data separation step. Correction encoding step; A second outer code error correction encoding step of performing external error correction encoding on the remaining video data by adding an outer parity of the outer parity region independently of the trick data of the video data region in the first outer code error correction encoding step; An inner code error correction encoding step of performing inner code error correction encoding on each of the normal reproduction data and the trick reproduction data encoded by the error correction encoding in the second outer code error correction encoding step; And a recording step of modulating the error correcting coded normal reproduction data and the trick reproduction data in the internal code error correcting encoding step and recording them at a predetermined position of each track on the tape. 2. The method of claim 1, wherein the first outer code error correction encoding step applies predetermined pattern data to a portion of the video data area. 3. The recording method of digital video tape according to claim 2, wherein the first outer code error correction encoding step applies predetermined pattern data to the trick area. 3. The method of claim 2, wherein the first outer code error correction encoding step applies a zero to the trick area. A tape reproduction method for reproducing normal reproduction data and trick reproduction data of digital video recorded in a video sector on a digital video tape, wherein the internal code error corrects and decodes internal code errors for the reproduced normal reproduction data and trick reproduction data, respectively. Correction decoding step; A second external code error correction decoding step of performing external error correction decoding on some video data by external parity of a separate error correction area independently of trick data of a video data area of a predetermined digital format in the internal code error correction decoding step; ; A first outer code error correction encoding step of performing outer error correction encoding on the remaining video data by the outer parity of the outer parity region independently of the trick data of the video data region in the second outer code error correction decoding step; And a normal and trick playback data combination step of outputting an ATV signal by combining error corrected and decoded normal playback data and trick playback data in the first outer code error correction decoding step. 5. The method of claim 4, wherein the first outer code error correction decoding step applies predetermined pattern data to a portion of the video data area. 6. The method of claim 5, wherein in the first outer code error correction decoding step, predetermined pattern data is applied to the trick area. 6. The method of claim 5, wherein the first outer code error correction decoding step applies a zero to the trick area. A method of recording and reproducing an inter coded digital video signal including picture data supplied at predetermined intervals and independently decodable into a normal playback data area and a trick reproduction data area on a digital video tape, and transmitting the same A normal and trick play data separation step of separating the normal data and the trick play data from the signal; First external code error in which the external error correction coding is performed by adding an external parity to a separate error correction area for some video data independently of the trick data of a video data area of a predetermined digital format in the normal and trick reproduction data separation step. Correction encoding step; A second outer code error correction encoding step of performing external error correction encoding on the remaining video data by adding an outer parity of the outer parity region independently of the trick data of the video data region in the first outer code error correction encoding step; An inner code error correction encoding step of performing inner code error correction encoding on each of the normal reproduction data and the trick reproduction data encoded by the error correction encoding in the second outer code error correction encoding step; A recording step of modulating the normal reproduction data and the trick reproduction data encoded by the error correction encoding in the internal code error correction encoding step, and recording them on a predetermined position of each track on the digital tape; An internal code error correction decoding step of decoding internal code error correction on the normal reproduction data and the trick reproduction data reproduced on the digital tape, respectively; A first outer code error correction decoding step of performing external error correction decoding on some video data by external parity of a separate error correction region independently of trick data of a video data region of a predetermined digital format in the inner code error correction decoding step; ; A second outer code error correction encoding step of performing outer error correction encoding on the remaining video data by the outer parity of the outer parity region independently of the trick data of the video data region in the first outer code error correction decoding step; Recording and reproducing a digital video tape comprising a normal and trick reproduction data combination step of outputting an ATV signal by combining the error correction decoded normal reproduction data and trick reproduction data in the second outer code error correction decoding step. Way. 10. The method of claim 7, wherein the first outer code error correction encoding step applies predetermined pattern data to a trick area. 8. The method of claim 7, wherein the first outer code error correction encoding step applies a zero to a trick area. 8. The method of claim 7, wherein the second outer code error correction decoding step applies predetermined pattern data to a trick area. 8. The method of claim 7, wherein the second coded error correction decoding step applies a zero to a trick area.