JP2005302078A - Information reproducing apparatus and information reproducing method - Google Patents

Abstract

【Task】
In order to reproduce audio and images in real time, it is necessary to decode even uncorrectable data. However, when erroneous correction occurs in the scramble seed, decoding of the data disturbs video and audio.
[Solution]
At the time of demodulation, the IED that detects the error of the DataID including the scramble seed is checked to determine the reliability of the DataID, and the value of the DataID for which the reliability is ensured is set in a separate area from the buffering of the demodulated data by the CPU or the like. Store. After error correction, the value of DataID stored in the separate area is overwritten with respect to DataID for which error correction has been performed. Thereby, even if DataID is erroneously corrected, reliable DataID can be used, and descrambling can be performed in a state where the scramble seed is reliable. As a means for ensuring reliability, there is a method for confirming continuity of addresses.
[Selection] Figure 3

Description

  The present invention relates to an information reproducing apparatus and an information reproducing method for performing error correction, and more particularly to an information reproducing apparatus for performing digital processing including seed data in an error correction target area in information recording / reproducing data such as communication data and an optical disc. And an information reproducing method.

  In an information reproducing apparatus that performs error correction, when it is determined that correction is impossible after error correction is completed, data is read again from the reproducing apparatus until correction is possible, and error correction is performed. When error correction is performed and no error is found by error detection, descrambling processing is performed as normal data, decoding processing is performed, and audio and images are generated (for example, Patent Document 1). However, in order to prevent interruption of video and audio playback that requires real-time processing, for example, when the state that becomes uncorrectable is repeated due to the shape of the disk, dust, scratches, etc. A descrambling process may be performed without correction, and data transfer may be performed to the decoder device side. For this reason, even if the data is incorrect, the decoder side performs smoothing by applying a filter process to the sound or image, and processes the reproduction so as not to have a fatal effect on the reproduction.

  Further, after error correction is performed on the demodulated data, descrambling processing is performed. The descrambling processing is performed for each data block unit (sector) 501 as shown in one sector format of the DVD in FIG. A scramble seed 504 for performing descrambling processing existing in the DataID 502 area in the sector is used as a seed. If the value of this area is incorrect, all descrambling in the sector 501 is erroneously performed. On the other hand, error correction may be performed depending on the arrangement and contents of data during error correction. Since it is difficult to distinguish between the case where an error correction has occurred and the case where it has been corrected normally at the stage of error correction, error detection (hereinafter referred to as EDC) can be performed by performing a descrambling process. It will be later processing.

  However, if the scramble seed 504 is erroneously corrected, the descrambling process is performed with the incorrect scramble seed 504, so that the data is erroneous in almost all areas in units of sectors. For this reason, even if decoding processing is performed on this data, the voice and image data necessary for the real-time processing that is the original purpose cannot be obtained. There was a problem of having an influence.

The present invention has been made to solve the above-described problems. When decoding is performed even if correction is impossible, highly reliable data is transferred and video and audio are reproduced in real time. An object is to provide an information reproducing apparatus and an information reproducing method.
JP 2001-273729 A

  In order to solve the above problem, an information reproducing apparatus according to claim 1 of the present invention is provided in a demodulating means for demodulating digital data composed of a plurality of data blocks to which an error correction code is added, and in each data block. DataID determination means for determining the reliability of DataID including a scramble seed used for descrambling processing; first storage means for storing data demodulated by the demodulation means in units of data blocks; and trust by the DataID determination means Error correction is performed by the second storage means for storing the DataID determined to be correct, the error correction means for error correction of the data stored in the first storage means, and the error correction means Among the data, for the DataID corresponding to the DataID stored in the second storage means, A data control means for overwriting the DataID stored in unit, in which a descrambling means for descrambling the data stored in the first storage means.

  Also, in the information reproducing apparatus according to claim 2 of the present invention, in the information reproducing apparatus according to claim 1, the DataID judging means checks an IED (ID Error Detection Code) for detecting an error of DataID and This is to determine the reliability of DataID.

  The information reproducing apparatus according to claim 3 of the present invention is the information reproducing apparatus according to claim 1, wherein the DataID determining means confirms that the DataID is continuous in adjacent data blocks, and the DataID is determined. Is to judge the reliability.

  An information reproducing apparatus according to claim 4 of the present invention is the information reproducing apparatus according to any one of claims 1 to 3, wherein the second storage means stores the determination result of the DataID determination means. The unreliable DataID is also stored, and when the data control unit obtains the determination result that the DataID is reliable from the second storage unit, the data control unit performs the overwrite update, and When the determination result that the DataID is not reliable is obtained from the storage means, the DataID stored in the second storage means is compared with the DataID that has been subjected to error correction by the error correction means, If the DataID after the error correction is not error-corrected, it instructs to reread the data in the same area as the DataID.

  According to a fifth aspect of the present invention, there is provided an information reproduction method comprising: a demodulation step for demodulating digital data comprising a plurality of data blocks to which an error correction code is added; and a scramble used for descrambling processing present in each data block. It is determined that there is reliability in the DataID determination step for determining the reliability of the DataID including the seed, the first storage step for storing the data demodulated in the demodulation step in units of data blocks, and the DataID determination step. A second storage step for storing the DataID; an error correction step for performing error correction on the data stored in the first storage step; and the data for which error correction has been performed in the error correction step. In the DataID corresponding to the DataID stored in step 2 There are, those having a data control step of overwriting the DataID stored in the second storage step, and a descrambling step of descrambling the data stored in said first storing step.

  The information reproduction method according to claim 6 of the present invention is the information reproduction method according to claim 5, wherein the DataID determination step checks an IED (ID Error Detection Code) for detecting an error of DataID and This is to determine the reliability of DataID.

  The information reproduction method according to claim 7 of the present invention is the information reproduction method according to claim 5, wherein the DataID determination step confirms that the DataID is continuous in adjacent data blocks, and It is for judging reliability.

  An information reproduction method according to claim 8 of the present invention is the information reproduction method according to any one of claims 5 to 7, wherein the second storage step stores the determination result of the DataID determination step. When the data control step obtains a determination result that the data ID is reliable, the data control step performs the overwriting update and determines that the data ID is not reliable. If the data ID stored in the second storage step is compared with the Data ID subjected to the error correction in the error correction step, the Data ID after the error correction is If there is no data ID, it instructs to reread the data in the same area as the DataID.

  According to the information reproducing apparatus of the first aspect of the present invention, the demodulating means for demodulating the digital data composed of a plurality of data blocks to which the error correction code is added, and the scrambler that is present in each data block and is used for descrambling processing. DataID determination means for determining the reliability of DataID including a seed, first storage means for storing data demodulated by the demodulation means in units of data blocks, and the DataID determination means are determined to be reliable. Among the data stored in the second storage unit for storing the DataID, the error correction unit for performing error correction of the data stored in the first storage unit, and the data subjected to error correction by the error correction unit, For the DataID corresponding to the DataID stored in the second storage means, D stored in the second storage means Since the data control means for overwriting and updating the taID and the descrambling means for descrambling the data stored in the first storage means are provided, even if the value of DataID determined to be reliable is erroneously corrected, Since reliable DataID can be used, there is an effect that descrambling can be performed in a state where the scramble seed is reliable. Thereby, in real-time processing, even if uncorrectable data is obtained, there is an effect that the signal can be smoothed by the filter of the decoder device and reproduced as video or audio.

  According to the information reproducing apparatus of claim 2 of the present invention, in the information reproducing apparatus of claim 1, the DataID judging means checks an IED (ID Error Detection Code) for detecting a DataID error. Thus, the reliability of the DataID is determined, and there is an effect that it is possible to confirm whether or not the DataID of the data block for which error correction is performed is reliable.

  According to the information reproducing apparatus of claim 3 of the present invention, in the information reproducing apparatus of claim 1, the DataID determining means confirms that the DataID is continuous in adjacent data blocks. Since the reliability of the DataID is determined, there is an effect that it is possible to confirm whether or not the DataID of the data block for which error correction is performed is reliable.

  According to the information reproducing apparatus of claim 4 of the present invention, in the information reproducing apparatus of any one of claims 1 to 3, the second storage means stores the determination result of the DataID determination means. In addition, when the data control unit obtains a determination result that the data ID is reliable from the second storage unit, the data control unit performs the overwrite update, If the determination result that the DataID is not reliable is obtained from the second storage means, the DataID stored in the second storage means is compared with the DataID that has been subjected to error correction by the error correction means. If the DataID after the error correction is not error-corrected, it instructs to re-read the data in the same area as the DataID. In, there is an effect capable of ensuring the reliability of the descrambling seed region.

  According to the information reproduction method of the fifth aspect of the present invention, a demodulation step for demodulating digital data composed of a plurality of data blocks to which an error correction code is added, and a descrambling process present in each data block There is reliability in the DataID determination step for determining the reliability of DataID including the scramble seed used for the first, the first storage step for storing the data demodulated in the demodulation step in units of data blocks, and the DataID determination step A second storage step for storing the determined DataID, an error correction step for correcting an error in the data stored in the first storage step, and data that has been subjected to error correction in the error correction step , Dat corresponding to DataID stored in the second storage step Since the data control step of overwriting and updating the DataID stored in the second storage step and the descrambling step of descrambling the data stored in the first storage step are provided for the ID, Even if the value of the determined DataID is erroneously corrected, it is possible to use a reliable DataID, and there is an effect that descrambling can be performed while the scramble seed is reliable. Thereby, in real-time processing, even if uncorrectable data is obtained, there is an effect that the signal can be smoothed by the filter of the decoder device and reproduced as video or audio.

  According to the information reproduction method of claim 6 of the present invention, in the information reproduction method of claim 5, the DataID determination step checks an IED (ID Error Detection Code) for detecting a DataID error. Thus, the reliability of the DataID is determined, and there is an effect that it is possible to confirm whether or not the DataID of the data block for which error correction is performed is reliable.

  According to the information reproduction method of claim 7 of the present invention, in the information reproduction method of claim 5, the DataID determining step confirms that the DataID is continuous in adjacent data blocks. Since the reliability of the DataID is determined, there is an effect that it is possible to confirm whether or not the DataID of the data block for which error correction is performed is reliable.

  Further, according to an information reproduction method according to claim 8 of the present invention, in the information reproduction method according to any one of claims 5 to 7, the second storage step stores a determination result of the DataID determination step. In addition, it stores the unreliable DataID, and when the data control step obtains the determination result that the DataID is reliable, it performs the overwriting update, and the DataID is not reliable. When the determination result is obtained, the DataID stored in the second storage step is compared with the DataID subjected to error correction in the error correction step, and the DataID after execution of the error correction is error corrected. If not, it is an instruction to re-read the data in the same area as the DataID. There is an effect that it is possible to ensure the reliability of the region.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an optical disc reproducing apparatus 100 which is an information reproducing apparatus according to Embodiment 1 of the present invention.

  In the figure, 101 is an optical disk, 102 is an optical pickup, 103 is a spindle motor, 104 is a driver circuit, 105 is a servo block, 106 is an A / D converter, 107 is a demodulation circuit, 108 is a RAM interface, 109 is a CPU, 110 Is an ECC circuit, 111 is an AV decoder, 112 is a RAM, and 113 is a ROM. In the first embodiment, the data configuration is a plurality of data block units (hereinafter referred to as sectors) shown in FIG.

  In the figure, digital data is recorded on an optical disc 101, and the optical disc 101 is rotationally driven by a spindle motor 103 controlled by a servo block 105, and is digitally read from the optical disc 101 by an optical pickup 102 controlled by a servo block 105. Data is read out as an analog playback signal. The analog reproduction signal read by the optical pickup 102 is subjected to processing such as binarization by the A / D converter 106, converted into digital data by this, and then supplied to the demodulation circuit 107. In the demodulation circuit 107, the synchronization detection of the sector 501 is performed, 8/16 demodulation processing is performed, data unnecessary for error correction is separated, and transferred to the RAM 112 through the RAM interface 108. The data buffered in the RAM 112 is error-corrected using the ECC circuit 110 for each ECC block unit of 16 sectors. The error-corrected data is developed on the RAM 112 via the descrambling EDC circuit 114. The AV decoder 111 decodes this data to convert it into an image signal and an audio signal. The CPU 109 supervises these entire processes by instructions read from the ROM 113.

Next, the demodulation circuit 107 will be described. FIG. 2 is a block diagram showing the demodulation circuit 107.
First, the head of the sector 501 is detected by the SYNC detector 201. Thereafter, demodulation is performed by the 8/16 demodulator 202, and in order to confirm the reliability of the DataID 502 of the demodulated data, the IED check unit 204 checks the IED 505 that detects a DataID error. The demodulated data is received by the address generation unit 205 and is set as DataID. Then, the demodulated output data is output by the output unit 203 to notify the CPU 109 that the address processing for each sector has been completed.

  Next, the operation after the end of the address process in the optical disc reproducing apparatus according to Embodiment 1 of the present invention will be described with reference to the flowchart of FIG.

  First, the CPU 109 that has received the notification of the end of address processing acquires the result of the IED check from the demodulation block, the value of DataID from the address generator 205, and the like (step S401). The CPU 109 receives the data ID 502 for 16 sectors and the result of the IED check, and holds the IED check result and the data ID 502 in an area different from the buffer area of the demodulated data in the RAM 112 accessible from the CPU 109 (step S402). ). If the IED check result and DataID are held for 16 sectors (step S403), the ECC block buffered in the RAM 112 waits for error correction to be completed by the ECC circuit 110 (step S404). Then, after confirming that the error correction is completed in step S404, the IED check result held by the CPU 109 and the IED result after the error correction are extracted for each sector (step S405). Then, by checking the IED check result taken out in step S405, it is determined whether or not the IED result for the sector is reliable (step S406). At this time, the reliability of the IED result for the sector is determined. If it can be confirmed, if the value of the DataID 502 area stored in the RAM 112 is different from the value of the DataID 502 area held by the CPU 109, the DataID 502 area stored in the RAM 112 by error correction in step S404. Therefore, the value of the DataID area stored in the RAM 112 is overwritten with the value of the DataID area held by the CPU 109 (step S407). Then, the next sector is processed (step S408).

  Conversely, if the CPU determines that the IED result of the sector is unreliable when the IED check result is confirmed in step S406, the value of DataID stored in the RAM 112 and the CPU 109 Is compared with the value of DataID held by the CPU 112, and after error correction, it is confirmed whether the value of the DataID 502 area stored in the RAM 112 has been changed to a value different from the DataID 502 area held by the CPU 109 (step S409). If it is confirmed in step S409 that the DataID 502 area has been corrected by error correction, the value should be different from the value held by the CPU 109. In this case, it can be said that the state is reliable. Accordingly, processing is performed for the next sector (step S408). In step S409, if it is not changed to a value different from the value held by the CPU 109, it is determined that the value has not been corrected, and it is necessary to repeat the same reading procedure for the same area on the disk again. Retry target sector.

  In step S408, when these processes are performed for 16 sectors, the descrambling EDC circuit 114 performs descrambling processing (step S410). After descrambling, data is transferred to the AV decoder 111, and if it is data related to video and audio, it is reproduced by processing such as a filter even if it is uncorrectable data.

  Thus, by performing an IED check and using a reliable DataID, descrambling can be performed in a state where the scramble seed is reliable.

  The scramble seed is a part of the area of sector number 503, and this area is known to be continuous in adjacent sectors. Therefore, reliability can be obtained by confirming that this address is continuous instead of performing the IED check. For example, when the value of DataID 502 is acquired as 00300000h, 00300001h, 00400000h, 00300003h, etc., it is apparent that the continuity of the address is not secured at 00400000h and is 00300002h.

  FIG. 4 is a diagram showing an operation for determining the reliability of DataID by checking the continuity of the address instead of performing the IED check, and only the difference from FIG. 3 will be described.

  In step S <b> 502, the CPU 109 holds the continuity confirmation result of the address information and the DataID 502 in an area different from the demodulated data buffering area in the RAM 112 accessible from the CPU 109. In step S505, after confirming the completion of error correction in step S504, the continuity confirmation result of the address information held by the CPU and the IED result obtained by performing the error correction are extracted for each sector. In step S506, it is determined whether or not the IED result for the sector is reliable by confirming the continuity confirmation result of the extracted address information.

  In this way, by confirming the continuity of address information and using a reliable DataID, descrambling can be performed in a state where the scramble seed is reliable.

  In the first embodiment, the reliability of DataID is determined by IED check or confirmation of address continuity, but these processes may be combined.

  The information reproducing apparatus according to the first embodiment of the present invention as described above has a DataID area including a scramble seed area by confirming an IED check result or address continuity before performing a descrambling process. Therefore, it is possible to perform descrambling in a state where the scramble seed is reliable, and when reproducing video and audio in real time, even if the data cannot be corrected, the filter of the decoder device Signal smoothing can be achieved.

  Since the information reproducing apparatus according to the present invention can perform descrambling in a state where the descrambling seed is reliable by using the DataID in which the result of the IED check and the sector number are confirmed to be continuous, It is useful for an optical disc playback apparatus that plays back video and audio.

1 is a block diagram showing a configuration of an optical disc apparatus that is an information reproducing apparatus according to Embodiment 1 of the present invention. Block diagram showing configuration of demodulation circuit In Embodiment 1 of this invention, the flowchart which shows 1ECC block reproduction | regeneration processing In Embodiment 1 of this invention, the flowchart which shows 1 ECC block reproduction | regeneration processing of the example different from FIG. The figure which shows 1 sector format of DVD

Explanation of symbols

100 Optical disk playback device (information playback device)
101 Optical Disk 102 Optical Pickup 103 Spindle Motor 104 Driver Circuit 105 Servo Block 106 A / D Converter 107 Demodulation Circuit 108 RAM Interface 109 CPU
110 ECC circuit 111 AV decoder 112 RAM
113 ROM
114 Descramble EDC circuit 201 SYNC detection unit 202 8/16 demodulation unit 203 Output unit 204 IED check unit 205 Address generation unit 501 Data block (sector)
502 DataID
503 Sector number 504 Scramble seed 505 IED

Claims (8)

Demodulation means for demodulating digital data composed of a plurality of data blocks to which an error correction code is added;
DataID determination means for determining the reliability of DataID that is present in each data block and includes a scramble seed used for descrambling processing;
First storage means for storing data demodulated by the demodulation means in units of data blocks;
Second storage means for storing the DataID determined to be reliable by the DataID determination means;
Error correction means for performing error correction of data stored in the first storage means;
Data control for overwriting and updating the DataID corresponding to the DataID stored in the second storage means over the DataID stored in the second storage means among the data corrected by the error correction means Means,
Descrambling means for descrambling the data stored in the first storage means,
An information reproducing apparatus characterized by that. The information reproducing apparatus according to claim 1,
The DataID determination means includes
Checking IED (ID Error Detection Code) for detecting DataID errors to determine the reliability of the DataID.
An information reproducing apparatus characterized by that. The information reproducing apparatus according to claim 1,
The DataID determination means includes
Confirming that the DataID is continuous in adjacent data blocks and determining the reliability of the DataID.
An information reproducing apparatus characterized by that. The information reproducing apparatus according to any one of claims 1 to 3,
The second storage means is
The determination result of the DataID determination means is stored, and the unreliable DataID is also stored.
The data control means includes
When the determination result that the DataID is reliable is obtained from the second storage means, the overwriting update is performed,
When the determination result that the DataID is not reliable is obtained from the second storage means, the DataID stored in the second storage means and the DataID that has been subjected to error correction by the error correction means In comparison, when the DataID after the error correction is not error-corrected, the dataID in the same area as the DataID is instructed to be read again.
An information reproducing apparatus characterized by that. A demodulation step for demodulating digital data composed of a plurality of data blocks to which an error correction code is added;
A DataID determination step for determining the reliability of DataID that is present in each data block and includes a scramble seed used for descrambling processing;
A first storage step of storing data demodulated in the demodulation step in units of data blocks;
A second storage step for storing the DataID determined to be reliable in the DataID determination step;
An error correction step for performing error correction of the data stored in the first storage step;
A data control step of overwriting and updating the DataID stored in the second storage step with respect to the DataID corresponding to the DataID stored in the second storage step among the data corrected in the error correction step. When,
A descrambling step for descrambling the data stored in the first storage step,
An information reproduction method characterized by the above. The information reproduction method according to claim 5,
The DataID determination step includes:
Checking IED (ID Error Detection Code) for detecting DataID errors to determine the reliability of the DataID.
An information reproduction method characterized by the above. The information reproduction method according to claim 5,
The DataID determination step includes:
Confirming that the DataID is continuous in adjacent data blocks and determining the reliability of the DataID.
An information reproduction method characterized by the above. The information reproduction method according to any one of claims 5 to 7,
The second storing step includes
The determination result of the DataID determination step is stored, and the unreliable DataID is also stored.
The data control step includes
When the determination result that the DataID is reliable is obtained, the overwriting update is performed,
When the determination result that the DataID is not reliable is obtained, the DataID stored in the second storage step is compared with the DataID subjected to the error correction in the error correction step, and the error correction When the DataID after execution is not error-corrected, the dataID in the same area as the DataID is instructed to be read again.
An information reproduction method characterized by the above.

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