KR100230287B1 - Digital recording/reproducing device and method improving error correction ability of trick reproduction data - Google Patents

Abstract

Disclosed are a digital recording / reproducing apparatus and method for improving error correction capability of trick reproduction data. The present invention interleaves the error correction coded one-dimensional error correction coded data in the unit of a predetermined number of sync blocks during recording, and interleaves the number of sync block units in the predetermined number of sync blocks during recording. Error correction decoding is performed by deinterleaving the reproduced data again.

Description

Digital recording / playback device and its method improving error correction capability of trick play data

The present invention relates to the field of digital recording / reproduction, and more particularly to the field of error correction of digital recording / reproducing apparatus.

Digital video can be used in many applications such as the computer and consumer electronics industry, as well as in the communications sector, such as videoconferencing and video telephony. In particular, digital video cassette recorders (hereinafter referred to as "digital VCRs") and digital video cassettes (DVC) Digital recording / playback devices, such as camcorders, employ the Moving Picture Experts Group (MPEG) -2 standard for digital storage media.

According to the MPEG-2 standard, the program stream is composed of respective elementary streams for video, audio, and user data bit streams, which are packetized into packetized elementary streams (PES).

In general, each picture transmitted from a broadcasting station is one PES, and one PES is transmitted in a predetermined transport packet. In addition, the data on the transmission path has a system layer structure of MPEG-2, which has a packet structure of 188 bytes. In each packet, a 4-byte header consists of 1 byte of sink and 3 bytes of side information. The number of bytes in the header can vary. Video data, audio data, user data, and the like are carried in the region excluding the header in the packet.

On the other hand, the digital recording / reproducing apparatus records only normal playback data in order to cope with both normal-play (NP) mode and trick-play (TP) mode when recording the transmitted MPEG-2 bitstream. Rather, trick-play data is extracted from the MPEG-2 bitstream and recorded in a separate trick-play data area.

When recording a video bit stream in MPEG-2 format to a digital recording / reproducing apparatus, an error correction code (ECC) structure appearing in a track format is used to record an inter-picture coded bit stream. Or bitstreams encoded between pictures such as DVB signals are vulnerable to errors.

In order to cope with this, error correction is performed two-dimensionally by external and internal error correction due to the characteristics of MPEG-2 signals, and separate error correction parity is added to further improve error correction capability of normal playback data. Can be added. That is, a specific area of the normal reproduction data area is allocated, which is called an ECC3 area, and is for storing external parity for correcting an error of only normal reproduction data.

However, the trick-play data is also MPEG-2 structured data, but the error correction of the trick-play data in one dimension (internal error correction) has a problem that is vulnerable to errors.

In order to overcome the above problems, it is an object of the present invention to provide a digital recording / reproducing apparatus for improving the error correction capability of trick-play data.

It is another object of the present invention to provide a digital recording / reproducing apparatus for interleaving error correction coded trick reproduction data during recording, and deinterleaving the reproduced trick reproduction data during reproduction, and then performing error correction decoding.

It is another object of the present invention to provide a digital recording / reproducing method for improving the error correction capability of trick reproduction data.

It is still another object of the present invention to provide a digital recording / reproducing method of interleaving error correction encoded trick reproduction data during recording, and deinterleaving the reproduced trick reproduction data upon reproduction and then error correction decoding.

In order to achieve the above object and other objects, the additional information inserting means of the recording apparatus of the present invention inserts additional information representing the decoding point in the received transport stream and outputs normal reproduction data in a predetermined number of sync block units. The extraction means extracts the trick reproduction data from the received transport stream and outputs the trick reproduction data in units of a predetermined number of sync blocks, and the error correction encoding means does not depend on the trick reproduction data, and encodes the external error correction for normal reproduction data. And internal error correction coding is performed on the trick reproduction data and the external error correction coded normal reproduction data to output error correction encoded normal reproduction data and trick reproduction data, and the interleaving means is error corrected and encoded in units of a predetermined number of sync blocks. Interleaving trick playback data to interleave trick playback The data is output, and the modulating means modulates the error correction coded normal reproduction data and the interleaved trick reproduction data to transmit the modulated data to the recording medium.

The demodulation means of the reproduction apparatus of the present invention demodulates the data recorded on the recording medium to output demodulated normal reproduction data and trick reproduction data, and the deinterleaving means deinterleaves the demodulated trick reproduction data in a predetermined number of sync block units. Outputting the deinterleaved trick play data, and the error correction decoding means error correcting and decoding the demodulated normal play data and deinterleaved trick play data to output error corrected decoded normal play data and trick play data, and selecting means. Selects the error correction decoded normal reproduction data in the normal reproduction mode according to the normal / trick reproduction mode, and selects the error correction decoded trick reproduction data in the trick reproduction mode.

The recording method of the present invention includes inserting additional information indicating a decoding time in a received transport stream and outputting a transport packet having the additional information inserted therein; Outputting normal reproduction data in sync block units; extracting trick reproduction data from a received transport stream; converting the extracted trick reproduction data into a second predetermined number of packetized first predetermined number of transmission packets Outputting the trick playback data in units of sync blocks; external error correction coding is performed on the normal playback data without depending on the trick playback data, and internal error correction coding is performed on the trick playback data and the external error correction coded normal playback data. Outputting the error correction coded normal reproduction data and trick reproduction data, and the second predetermined number of sinkables Interleaving the error correction coded trick reproduction data in units to output interleaved trick reproduction data; and modulating the error correction encoded normal reproduction data and interleaved trick reproduction data to transmit the modulated data to a recording medium. do.

The present invention also provides a method of demodulating data recorded on a recording medium, outputting demodulated normal reproduction data and trick reproduction data, and deinterleaving the demodulated trick reproduction data to output deinterleaved trick reproduction data. Error correcting and decoding the demodulated normal play data and the deinterleaved trick play data to output error corrected decoded play data and trick play data, and correcting error corrected and decoded in the normal play mode according to the normal / trick play mode. Selecting the playback data and selecting the error correction decoded trick playback data in the trick playback mode.

1 is a block diagram of an encoder of a digital video cassette recorder according to an embodiment of the present invention.

2 is an example of a track format of a signal supplied for recording on a digital video tape.

3 is a format of an ECC block recorded in the video sector shown in FIG.

FIG. 4 is a table for describing the sync block additional header shown in FIG. 3.

FIG. 5A is a diagram for explaining the 2 to 5 mapping performed in the buffer controller shown in FIG. 1, and FIG. 5B is a diagram for explaining the time stamp shown in FIG. 5A. Drawing.

FIG. 6 is a diagram for explaining external error correction encoding performed by the external error correction encoder shown in FIG. 1.

7A and 7B are an input format and an output format of the trick reproduction data interleaver shown in FIG. 1, respectively.

8 is a block diagram of a decoder of a digital video cassette recorder according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the digital recording / reproducing apparatus and the method for improving the error correction capability of the trick reproduction data according to the present invention.

In Fig. 1, the program selector 102 selects a transport stream of a program corresponding to a program number input by a user from an MPEG-2 transport stream and outputs the transport stream of the selected program to the time stamp adder 108. The PCR (Program Clock Reference) extracted from the transport stream is output to the PLL circuit 104 and the video layer extracted from the transport stream is output to the I-picture extractor 114. The PLL circuit 104 generates a 27 MHz clock synchronized with the 27 MHz clock used on the transmission side based on the PCR output from the program selector 102.

Here, the video image is digitized, bit streamed into an MPEG-2 structure, and transmitted as data in a compressed form. The bitstream has a video layer structure and a transport layer structure. The MPEG-2 compressor method is added to the video layer structure, and a header for transmission is added to the transport layer structure to transmit data in units of transport packets. do.

The timing control signal generator 106 counts up using the 27 MHz clock generated by the PLL circuit 104 to apply a track signal representing the track on the tape to the buffer controller 112 and the RAM controller 122, and normal playback data. An area control signal indicating whether it is an area, a stuffing area, an ECC3 area, or a trick reproduction data area is applied to the multiplexer 126, and an ECC block signal representing an ECC block is applied to the error correction encoder 128. "MUX" shown represents a multiplexer. Here, the recording is divided into 25 Mbps recording mode, 12.5 Mbps recording mode, and 6.25 Mbps recording mode according to the bit rate of the ATV signal or DVB signal recorded on the digital VCR. If the bit rate of the input source bit stream, that is, the input MPEG-2 bit stream is 13 Mbps, recording and playback in the 25 Mbps recording mode should be performed. In the part where the bit rate of the transmission signal differs from the bit rate of the recording mode, the stuffing data of a predetermined pattern is filled in the stuffing area.

The time stamp adder 108 uses a 27 MHz clock output from the PLL circuit 104 to recover the transport stream at a time interval equal to the input time of the transport stream input to the encoder in the decoder of the digital VCR. A time stamp indicating the time of arrival at the encoder is added for each transport packet output from the program selector 102.

The first buffer 110 temporarily stores normal reproduction data to which the time stamp output from the time stamp adder 108 is added. The buffer controller 112 separates one-byte sinks from normal reproduction data of 188-byte transport packets temporarily stored in the first buffer 110, collects two 187-byte packets, and maps them to five sync blocks. Contains the mapper.

The buffer controller 112 reads the normal playback data in units of five sync blocks in correspondence with the normal playback data area of the ECC block according to the track signal generated by the timing control signal generator 106, and stuffing data in the normal playback data area. Generates data of a predetermined pattern for the region and the ECC3 region. It is preferable that this stuffing area is also comprised of 5 sink block units, and 10 sink blocks are allocated to the ECC3 area | region.

In the present invention, in order to reduce the hardware burden, the ECC3 region is filled with predetermined pattern data to correct external and internal errors without considering ECC3. In order to cope with the burst error during ECC3 error correction encoding, since the normal reproduction data of the ECC structure is written in a predetermined number (usually ten) track units and external parity is added to the ECC3 area, a memory having a large memory capacity is required. This is because the hardware of the actual ECC3 decoding circuit is quite complicated.

Here, if the data of the predetermined pattern is in bytes, the data of the predetermined pattern of the stuffing area may be set from " 0 " to " 11111111 " as a binary value in an 8-dimensional bit space, but it is preferable to use an arithmetic zero pattern. Since all arithmetic zero patterns are simply generated, read-only memory (ROM) does not need to be provided for data pattern storage. In addition, since additions related to arithmetic zero can be omitted in the calculation process, using all arithmetic zero patterns as in the encoding process and the decoding process for reproducing the recorded video signal yields an external error correction calculation. Simplify

2 is an example of a track format of an ATV signal or a DVB signal supplied for recording on a digital video tape. As shown in Fig. 2, the signal format of the digital VCR read from the head is from the beginning of the track at which the head starts to scan, with each track being an ITI (Insert and Track Information) sector, an audio sector, a video sector and a subcode sector. It is.

In addition, the digital VCR is difficult to reproduce normally because the head output decreases and the error increases when the head deviates from the track of the magnetic tape during playback. Therefore, head tracking is performed by comparing crosstalks of pilot signals of the front and rear tracks of the track tracked closest to the head by recording different pilot signals, for example, in the order of FO, F1, F0, and F2 patterns on successive tracks. The head tracks the target track accurately by detecting whether it has moved away from the front track or the back track.

In the video sector of the video sector, there are six trick-play data areas (black portions) in one track alternately. In this area, high-speed trick-play data is recorded, and video of one track in four track periods is recorded. In one trick-play data area (black portion) of the area, trick-play data having a low speed is recorded. In the remaining video area, normal reproduction data or stuffing data is recorded. These high speed and low speed trick playback data areas can be arranged differently according to the double speed mode, and are allocated in units of five sync blocks or multiples thereof.

In the track format shown in FIG. 2, the video sector has an ECC structure as shown in FIG. In FIG. 3, the video sector includes 19-20 sync blocks as a first video auxiliary area (denoted as VAUX), 21-155 sync blocks as a video data area, and 156 as a second video auxiliary data area. It consists of sink blocks and 157-167 sink blocks, which are external parity areas. Each sync block consists of 2 bytes of sync code, 3 bytes of ID, 77 bytes of data, and 8 bytes of internal parity for internal error correction. The illustrated ECC2 region refers to a region where an external code is added to store external parity in the ECC structure, and the ECC1 region refers to a region to which an internal code is added to store internal parity in the ECC structure. Video auxiliary data such as a program number input by a user supplied from a servo mechanism system controller (not shown) is written in the first and second video auxiliary data areas.

Meanwhile, an ECC3 region of 21-30 sink blocks, a normal playback data region and a trick playback data region as shown in FIG. 2 exist in the video data region of the 21-155 sync blocks, and a stuffing region in the normal playback data region. It includes.

Then, within 77 bytes of each sync block of the video data area of these 21-155 sink blocks, there is a sync block addition header of 1 byte. This sync block additional header is a header for indicating whether the sync block data is normal playback data, trick playback data, stuffing data, or ECC3 data. This syncblock addition header is added at buffer controller 112 and packetizer mapper 120.

A table for explaining the contents of this sync block additional header is shown in FIG. In FIG. 4, if the most significant bit of the additional header of the 31 st sync block to the 155 th sync block is "0", and the next higher bit is also "0", it indicates stuffing data, and the most significant bit is "0" and the next higher order. A bit of "1" indicates normal playback data. If the most significant bit of the additional headers of the 31 st sync block to the 155 th sync block is "1", it indicates trick playback data, the next higher bit is a toggle bit indicating a corresponding packet among two packets, and the next high 5 The bit is a bit indicating the sync block ID of the trick reproduction data. If the most significant bit of the additional header of the 21st sync block to the 30th sync block is "0", it indicates that the ECC3 region. Data of a predetermined pattern is written in the ECC3 area of the present invention.

FIG. 5 (a) is a diagram for explaining the two-to-five mapping performed in the buffer controller shown in FIG. 1, and mapping two transmission packets to five sync blocks is referred to as two-to-five mapping. A three-byte time stamp indicating the time to decode is added to each packet, and a sync block addition header of one byte is added to each sync block. Here, the digital-VCR or DVC system for recording DVB and ATV signals usually performs 2 to 5 mapping, but the DVHS (Digital Video Home System) performs 2 to 3 mapping, so the present invention is not limited to 2 to 5 mapping.

Fig. 5B shows the internal structure of the three-byte time stamp shown in Fig. 5A. The time stamp shown in FIG. 5B includes a first time stamp area TSH and a second time stamp area TSL. In the first time stamp area TSL composed of the lower 18 bits, the count value in two tracks counted at 27 MHz is stored, and the count value of two track units is stored in the second time stamp region TSH composed of the upper 3 bits. A count value representing 16 tracks is stored.

On the other hand, since the digital VCR has a trick play mode, it must extract trick play data. Since the bit stream of MPEG-2 is compressed to MPEG-2 and the amount of compressed data is different for each image, trick reproduction cannot be performed with normal reproduction data. Thus, I-picture extractor 114 extracts the I-picture from the video layer output from program selector 102.

The second buffer 116 temporarily stores the extracted I-picture data, and the VLD analyzer 118 performs variable length decoding (VLD) on the DCT block by I-picture data stored in the second buffer 116. The trick reproduction data consisting of a DC coefficient and a predetermined number of low frequency AC coefficients is extracted on the image. The packetizer 2 to 5 mapper 120 packetizes the extracted trick-play data into a 188-byte transport packet by adding a transport packet header, separates 1-byte sink from the packetized trick-play data, and separates two 187 packets. By collecting packets of bytes and mapping them into five sync blocks, a time stamp is added to each packet and a sync block addition header as shown in FIG. 4 is added to each sync block. Here, the timestamp for trick-play data differs from the timestamp for normal playback data in that it does not include information indicating a decoding time point.

The RAM controller 122 writes trick regeneration data in units of five sync blocks output from the packetizers 2 to 5 mapper 120 to the RAM 124, and according to the track signal generated by the timing control signal generator 106. The trick playback data stored in the RAM 124 is read out to record in the trick playback data area of a predetermined track. At this time, since the trick playback data area can be repeatedly recorded at double speed, the RAM 124 is required.

The multiplexer 126 selects the normal playback data read from the buffer controller 112 in the normal playback data area of the ECC block according to the area control signal generated by the timing control signal generator 106, and the stuffing area and the ECC area. The predetermined pattern data (arithmetic zero) output from the buffer controller 112 is selected, and the trick reproduction data read out from the RAM 124 through the RAM controller 122 is selected in the predetermined trick reproduction data area of the track. This trick reproduction data refers to both high speed trick reproduction data for the high speed trick reproduction data area and low speed trick reproduction data for the low speed trick reproduction data area shown in FIG.

The error correction encoder 128 arranges the normal reproduction data and the trick reproduction data selected by the multiplexer 126 into ECC blocks according to the ECC block signals generated from the timing control signal generator 106, and then encodes the external and internal error correction codes. Here, the ECC block is composed of at least one ECC block per track.

The error correction encoder 128 adds 11 bytes of external parity to the 138 bytes of the external code in the column direction to perform external error correction coding, and then uses 8 bytes of internal parity for the 77 bytes of the internal code in the row direction. In addition, internal error correction coding is performed, and error correction external parity for normal reproduction data is not added to the ECC3 area, but is stored as an option area.

That is, the external error correction encoder 130 arranges the data of the ECC3 area, the stuffing area, and the trick reproduction data area by arranging predetermined pattern data (here arithmetic zero) in the ECC2 area for 138 bytes. Add 11 bytes of external parity. Therefore, since external parity is added only to normal reproduction data while ignoring data of the ECC3 region, stuffing region, and trick reproduction data region during external error correction encoding, error correction capability of the normal reproduction data can be improved. In this case, the first memory 132 has a maximum memory size of one field for use in external error correction encoding.

The internal error correction encoder 134 adds 8 bytes of internal parity to the ECC1 region for each 77-byte sync block of the external error correction coded data output from the external error correction encoder 130. The second memory 136 has a memory size of at least one sync block for use in internal error correction encoding.

In addition, the two-byte sync data and three-byte ID data shown in FIG. 2 may be added before the external error correction encoding or may be added after the internal error correction encoding.

On the other hand, the trick reproduction data interleaver 138 bypasses the data output from the error correction encoder 128 according to the sync block addition header if it is normal reproduction data, and internal error correction encoded trick reproduction of the input format shown in FIG. 7A. Data is interleaved as shown in FIG. 7B. In other words, the interleaving trick play data of the trick play data area in 5 sync block units and the inner parity of the inner parity area are mixed. By interleaving the internal error correction coded trick reproduction data, it is possible to correct a burst error occurring on a tape having a maximum of 20 bytes or less in 5 sync blocks without additional hardware. That is, since the burst error of a byte corresponding to 1/2 of the internal parity per one sync block can be corrected in the ECC1 structure, the burst error of trick playback data of 20 bytes or less can be corrected within the 5 sync blocks.

Here, the trick reproduction data interleaver 138 may change the order of reading the error correction coded trick reproduction data in software without any additional hardware. That is, five trick-play data symbols in the column direction are read in the row direction within the five sync blocks, and the read-out trick-play data of the five symbols read in the row direction are mixed. In addition, in order to further improve the error correction capability of the normal reproduction data, the normal reproduction data can be interleaved similarly to the trick reproduction data.

Modulator 140 modulates 24 to 25 interleaved data output from trick-play data interleaver 138 as is well known. The specific data modulation scheme used during recording is not critical to the disclosed invention.

The decoder of the digital VCR for reproducing the data recorded on the digital video tape is as shown in FIG. In FIG. 8, the demodulator 202 demodulates the data reproduced from the digital video tape T corresponding to the modulation system used for recording. Here, two bytes of sync and three bytes of ID can be separated from the demodulated normal playback data and trick playback data, or two bytes of sync and three bytes of ID can be separated after external error correction decoding.

The trick reproduction data deinterleaver 204 reads the trick reproduction data written on the recording medium in the order shown in FIG. 7B and applies it to the error correction decoder 206 in the order shown in FIG. 7A.

The error correction decoder 206 first decodes the internal error correction in the row direction. The error correction decoder 206 adds an error flag to an incorrect sync block after correcting up to 4 bytes out of 85 bytes. At this time, the external error correction decoding corrects an uncorrected sync block by using an error flag for indicating a sync block to be corrected and performs error correction in the column direction up to 11 bytes among 149 bytes.

That is, the internal error correction decoder 208 decodes the internal error correction decoding using internal parity for each sync block of the stuffing data sync block and the sync block of the ECC3 region as well as the normal playback data sync block and the trick playback data sync block. The first memory 210 is used for internal error correction decoding, and has a size of at least one sync block of memory.

The sync block additional header analyzer 212 analyzes the sync block additional header added to the internal error correction decoded normal playback data, and the internal error correction decoded data is converted into normal playback data, trick playback data, stuffing data, or data in the ECC3 region. Analyze cognition.

The external error correction decoder 214 arranges the predetermined pattern data used for encoding if the ECC3 region, the stuffing data region, and the trick reproduction data region are determined according to the sync block additional header analyzed by the sync block additional header analyzer 212. Decode error correction. The second memory 216 has a size of a memory of the ECC block for use in external error correction decoding, and has a memory size of at most one track.

That is, in normal playback, the external error correction decoder 214 is the ECC3 region when the most significant bit of the additional header of the sync block analyzed by the sync block additional header analyzer 212 is 30 for the 30th sync block in the 21st sync block. Therefore, the predetermined pattern data (here, arithmetic zero) is overwritten in each sync block of 76 bytes except for the sync block additional header for the ECC3 region, and the sync block additional header analyzer is performed for the 155th sync block from the 31st sync block. If the most significant bit of the syncblock additional header analyzed in 212 is "1", it is a trick playback data area. Therefore, a predetermined pattern (here, arithmetic here) is applied to each syncblock of 76 bytes except the additional header of the syncblock for the trick playback data area. Zero) and the sync block portion analyzed by the sync block additional header analyzer 212 from the 31st sync block to the 155th sync block. If both the most significant bit of the header and the next higher bit are "0", it indicates a stuffing area. Therefore, the stuffing data used for encoding for each sync block of 76 bytes except the sync block additional header is also used in this stuffing area (arithmetic zero here). By overwriting the external error correction decoding, error correction capability can be improved for the normal data by ignoring channel errors in the ECC3 area, trick playback data area, and stuffing area.

The demultiplexer 218 outputs data by varying a path for trick play data or normal play data according to a normal play mode or a trick play mode signal (NP / TP mode).

The buffer 220, the recovery time controller 222, the oscillator 224 and the timing generator 226 are paths for outputting normal reproduction data in the normal reproduction mode, where the oscillator 224 and the timing generator 226 are encoders. The PLL circuit 104 and the timing control signal generator 106 can be shared.

In the normal playback mode, the external error correction decoder 214 outputted through the demultiplexer 218 reads out the external error correction decoded normal playback data one by one sync block and temporarily stores it in the buffer 220 in units of 5 sync blocks of 77 bytes. Being saved. The recovery time controller 222 separates the time stamps from the normal playback data stored in the buffer 220 and configures two 187-byte transmission packets, and then adds one byte packet sink to each packet to configure a 188-byte transmission packet. The transmission packet is packetized through the multiplexer 232 according to the separated time stamp, that is, the normal reproduction data is packetized at a time interval input to the encoder.

Here, the timing generator 226 counts up the 27 MHz oscillation frequency oscillated by the oscillator 224 according to a clock and outputs a count value to the recovery time controller 222. That is, the recovery time controller 222 compares the count value output from the timing generator 226 with the time stamp of the transmission packet of the normal reproduction data and outputs the data at the same time.

The RAM controller 228 and the RAM 230 are paths for outputting trick play data in the trick play mode. In the trick play mode, the internal error correction decoded trick play data output through the demultiplexer 218 and the sync block additional header analyzer 212 is written to the RAM 230 and then read by the RAM controller 228. The RAM controller 228 removes duplicate data or non-trick playback data from the scanned trick playback data when scanning the trick playback data area on the tape for the trick playback mode, and also performs backward search. The time sync block is rearranged and written to the RAM 230. That is, the duplicate data may be generated by the trick playback data being repeatedly recorded on the track according to the speed, and other data other than the track playback data of the corresponding speed corresponding to the trick playback speed selected by the user during the trick playback mode. Can be read by the head.

In addition, the RAM controller 228 reads the rearranged internal error correction decoded trick reproduction data from the RAM 230 and configures two 187 bytes of transmission packets, and adds 1 byte of packet sync to each packet to add 188 bytes. The packet is output through the multiplexer 232 as a transport packet.

The multiplexer 232 selects the output of the recovery time controller 222 in the normal regeneration mode according to the normal regeneration / trick regeneration mode signal (NP / TP mode), and selects the output of the ram controller 228 in the trick regeneration mode. .

As described above, the present invention interleaves the error correction coded one-dimensionally corrected encoded reproduction data by a predetermined number of sync block units during recording, and during reproduction, deinterleaves the interleaved data and error corrects and decodes the error. Improve corrective ability

Claims (24)

An apparatus for dividing normal reproduction data and trick reproduction data into a recording medium in a predetermined data structure and reproducing the data recorded on the recording medium: Additional information insertion means for inserting additional information indicating a decoding time point into the received transport stream and outputting normal reproduction data in a predetermined number of sync block units; Extraction means for extracting trick playback data from the received transport stream and outputting trick playback data in units of a predetermined number of sync blocks; The external error correction coding is performed on the normal playback data without depending on the trick playback data, and the error correction coded normal playback data and trick playback are performed by performing internal error correction coding on the trick playback data and the external error correction coded normal playback data. Error correction encoding means for outputting data; Interleaving means for interleaving the error correction coded trick play data in units of the predetermined number of sync blocks and outputting interleaved trick play data; And And modulation means for modulating the error correction coded normal reproduction data and the interleaved trick reproduction data to transmit the modulated data to the recording medium. 2. The interleaving means according to claim 1, wherein the interleaving means reads out the predetermined number of error correction coded trick-play data symbols in a column direction and arranges them in a row direction within the predetermined number of sink blocks to output interleaved trick play data. Digital recording / playback device characterized in that. 2. The interleaving means according to claim 1, wherein the interleaving means reads the predetermined number of error correction coded normal reproduction data symbols in a row direction and arranges the interleaved normal reproduction data in the row direction within the predetermined number of sink blocks. And a digital recording / reproducing apparatus, which outputs to the modulation means. 2. The pattern of claim 1, wherein in the predetermined data structure, the normal reproduction data is in a normal reproduction data area, the trick reproduction data is in a trick reproduction data area, and a predetermined pattern by a difference between a predetermined recording rate and a bit rate of the transport stream. And arranging means for arranging the stuffing data in the stuffing area in the normal playback data area and outputting the stuffing data to the error correction coding means. The method of claim 4, wherein the error correction encoding means An external error correcting encoder for arranging predetermined pattern data in the stuffing area and the trick reproduction data area to add external parity to the normal reproduction data; And And an internal error correction encoder for adding internal parity to the trick reproduction data, the stuffing data, and the external error correction coded normal reproduction data. 6. The digital recording / reproducing apparatus according to claim 5, wherein each predetermined number is configured for each byte in the predetermined pattern. 6. The digital recording / reproducing apparatus according to claim 5, wherein the external error correction encoder overwrites predetermined pattern data in a separate error correction code area in the normal reproduction data area to perform external error correction coding. The method of claim 5, Demodulation means for demodulating the data recorded on the recording medium to output demodulated normal reproduction data and trick reproduction data; Deinterleaving means for deinterleaving the demodulated trick reproduction data in a predetermined number of sync block units to output deinterleaved trick reproduction data; Error correction decoding means for error correcting and decoding the demodulated normal reproduction data and the deinterleaved trick reproduction data to output error correction decoded normal reproduction data and trick reproduction data; And And selecting means for selecting the error correction decoded normal reproduction data in the normal reproduction mode according to the normal / trick reproduction mode, and selecting the error correction decoded trick reproduction data in the trick reproduction mode. Playback device. The method of claim 8, wherein the deinterleaving means reads the predetermined number of trick-play data symbols in the predetermined number of row blocks in the predetermined number of sync blocks, and arranges the predetermined number of trick-play data symbols in the column direction again. And outputting the deinterleaved trick reproduction data by repeating the read out of the predetermined number of trick reproduction data symbols in the column direction of the next row. 9. The apparatus of claim 8, wherein the deinterleaving means reads out the predetermined number of normal playback data symbols in the predetermined number of row blocks in the predetermined number of sync blocks and arranges the predetermined number of normal playback data symbols in the column direction again. And de-interleaved normal playback data to the error correction decoding means by repeating the readout of the predetermined number of normal playback data symbols in a column direction of a next row. The method of claim 8, wherein the error correction decoding means In the normal play mode, the demodulated normal play data is internal error corrected and decoded using the internal parity to output internal error correction decoded normal play data, and in the trick play mode, the deinterleaved trick play data is decoded to the internal parity. An internal error correction decoder for outputting the internal error correction-decoded trick-play data to the selecting means by using the internal error correction decoding method; And The stuffing area and the trick reproduction data area include an external error correction decoder for arranging the predetermined pattern data used for error correction encoding to perform external error correction decoding on the internal error correction decoded normal reproduction data using external parity. Digital recording / playback device characterized in that. The digital recording / reproducing apparatus according to claim 11, wherein the external error correction decoder overwrites predetermined pattern data in a separate error correction code area in the normal reproduction data area to decode the external error correction. A method of dividing normal reproduction data and trick reproduction data into a recording medium in a predetermined data structure and reproducing the data recorded on the recording medium: (a) inserting additional information indicating a decoding point into a received transport stream and outputting a transport packet having the additional information inserted therein; (b) outputting normal reproduction data in units of a second predetermined number of sync blocks in which a first predetermined number of additional information packets are inserted; (c) extracting trick play data from the received transport stream; (d) packetizing the extracted trick reproduction data to output the trick reproduction data by packetizing the first predetermined number of transmission packets in units of a second predetermined number of sync blocks; (e) The normal reproduction data of which error correction is coded by performing internal error correction encoding on the normal reproduction data, which is not dependent on the trick reproduction data, and the normal reproduction data of the trick reproduction data and the external error correction encoding. And outputting trick play data; (f) interleaving the error correction coded trick reproduction data in units of the second predetermined number of sync blocks to output interleaved trick reproduction data; And and (g) modulating the error correction coded normal reproduction data and the interleaved trick reproduction data to transmit the modulated data to the recording medium. The method of claim 13, wherein in the step (f), the second predetermined number of error correction coded trick-play data symbols in a column direction are read in a row direction and interleaved by writing in the second predetermined number of sync blocks in a row direction. And outputting trick-play data. 14. The interleaving method of claim 13, wherein in the step (f), the second predetermined number of error correction encoded normal playback data symbols in a column direction are read in a row direction and interleaved in the second predetermined number of sync blocks in a row direction. And outputting the normal reproduction data in step (g). The predetermined pattern according to claim 13, wherein in the predetermined data structure, the normal reproduction data is in a normal reproduction data area, the trick reproduction data is in a trick reproduction data area, and a predetermined pattern is obtained by a difference between a predetermined recording rate and a bit rate of the transport stream. And (h) arranging stuffing data in a predetermined stuffing area in the normal reproduction data area and outputting the same in step (e). The method of claim 16, wherein step (e) (e1) arranging predetermined pattern data in the stuffing area and the trick reproduction data area to add external parity to the normal reproduction data; And (e2) adding an internal parity to the trick reproduction data, the stuffing data and the external error correction coded normal reproduction data. 18. The method according to claim 17, wherein each predetermined number for each byte in said pattern is comprised. The method of claim 17, wherein step (e1) And external error correction coding by overwriting predetermined pattern data in a separate error correction code area in said normal reproduction data area. The method of claim 17, (i) demodulating the data recorded on the recording medium and outputting demodulated normal reproduction data and trick reproduction data; (j) deinterleaving the demodulated trick reproduction data to output deinterleaved trick reproduction data; (k) error correcting and decoding the demodulated normal reproduction data and the deinterleaved trick reproduction data to output error correction decoded normal reproduction data and trick reproduction data; And (l) selecting the error correction decoded normal reproduction data in the normal reproduction mode according to the normal / trick reproduction mode, and selecting the error correction decoded trick reproduction data in the trick reproduction mode. How to play. 21. The method of claim 20, wherein in step (j), the second predetermined number of trick-play data symbols read by reading the trick-play data symbols in the second predetermined number of row directions in the second predetermined number of sync blocks are read. And repeating the second predetermined number of trick-play data symbols read in the column direction and arranged again in the column direction of the next row to output deinterleaved trick-play data. . 21. The method of claim 20, wherein in step (j), the second predetermined number of normal playback data symbols read by reading the normal playback data symbols in the second predetermined number of row directions in the second predetermined number of sync blocks are read. Repeating arranging the second predetermined number of normal playback data symbols read in the column direction again in the column direction of the next row and outputting the deinterleaved normal playback data in step (l). Digital recording / playback method. The method of claim 20, wherein step (k) (k1) In the normal play mode, the demodulated normal play data is internal error corrected and decoded using internal parity to output internal error correction decoded normal play data, and in the trick play mode, the deinterleaved trick play data is internal parity. Outputting the internal error correction-decoded trick-play data using the internal error correction decoding using step (l); And (k2) arranging the predetermined pattern data used for error correction coding in the stuffing area and the trick reproduction data area to perform external error correction decoding on the internal error correction-decoded normal playback data using external parity. Digital recording / playback method characterized in that. 24. The digital recording / recording according to claim 23, wherein in the step (k2), external error correction decoding is performed by overwriting predetermined pattern data used for error correction coding in a separate error correction code area in the normal reproduction data area. How to play.

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