How to play information

 

(57) Abstract:

The invention relates to information technology, namely the means of reproduction of information, mainly from optical media. The task of improving the reliability of the recovery data stored in standard ways with long-term storage media due to integrated use of error-correcting coding and self-learning systems, pattern recognition. With this method of playback of the information recorded in the error-correcting code, read, decode and playback the defective areas of the media restore. The information of defective areas, not restored by decoding, correct by using self-learning system pattern recognition. For the training data are a sequence of information signals obtained by correcting the information from the previous successfully decoded portions of a media error. 1 Il.

The invention relates to information technology, and in particular to systems of reproduction of information, mainly from optical media, and can be used in the systems of long-term and archival storage, apparatii (ed. St. N 1436125, MCI G 11 20/10, 1988) resulted in strengthening of the original analog signals, convert them into the original pulse sequence. Thus to improve the reliability of reading by eliminating interference form the reference pulse sequence, determine the pulse duration of the original sequence, comparing the duration with a reference sequence of pulses, and on the basis of the original pulse sequence form the resulting pulse sequence.

The drawback of this method is that during long-term storage media under the influence of various harmful factors can lead to a deterioration of recording quality due to occurrence of microdefects in the substance of the media.

The prototype of the invention is a method of reproduction of information from optical media (ed. St. N 1831167 MCI G 11 7/00, 1995), which reproduce information recorded in a certain way, namely, the information recorded in the form of pits by exposure on the recording medium modulated beam of focused laser radiation, and in the process of recording the information knead the signal based on the comparison result record additional information in the special economic zone sector. When playing back recorded thus information is merging the data read from the primary and secondary zones sector.

The advantage of this method of play is that it allows to increase the reliability of data recovery from optical media. However, firstly, in this way to restore the defective information requires a special way of writing i.e., playback of the defective data stored in standard ways impossible. Secondly, the method does not take into account the possibility of information reproduction deterioration in the quality or information read from the partially destroyed media during long-term storage media.

The invention solves the following problem: improving the reliability of the recovery data stored on the media, standard methods for prolonged storage media due to integrated use of error-correcting coding and self-learning systems, pattern recognition.

The problem is solved in that with this method of playback of the information recorded in the error-correcting code, read, decode and playback innych plots the restoration of which decoding is not possible, use a pattern recognition system for training data composed of a sequence of information signals obtained by correcting the information from the previous successfully decoded defective areas of the media.

The drawing shows a functional diagram that implements the inventive method. Shows the playback device information contains optically coupled optical head 1 and the optical information carrier 2 with the actuator rotation and positioning, which in the drawing for simplicity is not shown. The first (address) input control unit 3 is connected with the corresponding external device (e.g. computer), not shown in the drawing for simplicity. The output of the optical head 1 is connected to the input of the playback unit 4. The first output of the playback unit 4 connected to the first input of the decoder 5. The first output of the decoder 5 is connected to the second input of the control unit 3. The first output control unit 3 is connected to the first input of the switch 6. The second output of the decoder 5 is connected to the first input of the unit pattern recognition 7. The first output unit pattern recognition 7 is connected to the third input node of UPRAVLENIE to the second input of the switch 6, and the fourth to the second input of the unit pattern recognition 7. The fourth input of the control unit 3 receives the signal "read" from the corresponding external device, for example, from the computer To the fifth input of the control unit 3 receives the signal from the second output of the playback unit 4. The output switch 6 is the output of the playback device information. Because in Fig. depicts a functional diagram of the playback device information corresponding to the links between nodes are shown individually, even though the actual product is homogeneous functional relationships can be combined informational tires.

The playback device information is as follows. At the first input of the control unit 3 receives the signal addresses subject to reproduction information, and the fourth input signal reading. Under the action of these signals drive the reciprocal movement of the optical storage medium 2 and the optical head 1 provides such a move, which ultimately match the current and the specified address.

When the reproduction of the information at the output of the optical head 1, the intensity of study is maintained constant at a level ensuring necroshade transmission data output from the optical head to the first input of the playback unit 4, in which the processing of electrical signals from the photodetector of the optical head (amplification of signals, converting analog signals into discrete). In addition, the playback unit can determine the optimal threshold signal for better detection of signals recorded on the media.

If the read was unsuccessful, is overriding the optimal threshold signal, and for increasing the accuracy of determining the threshold is the signal delay time correction value of the threshold. If you cannot convert signals, the playback unit 4 with its second output a corresponding signal to the fifth input of the control unit 3. Otherwise, the read information is transmitted from the first output unit play on the first input of the decoder, which is decoding the read data and the quality control of useful information on a predetermined criterion reliability. If the decoding was successful and there were no errors, the decoded data is transmitted from the third output of the decoder 5 to the second input of the switch 6. The decoder 5 generates a signal from the first output to the second vapodest control signal, authorizing the transfer of data. If the decoding was successful, but when the decoding of data read errors are found, an attempt is made to correct them by using the error correcting code. Upon successful decoding the read information of the decoded data is transmitted from the third output of the decoder 5 to the second input of the switch 6 and the fourth output of the decoder 5 to the second input of the unit pattern recognition 7, resulting in the recognition block image 7 is formed a training sample. Upon successful decoding, the decoder 5 generates a signal from the first output to the second input of the control unit 3, which is under the influence from the first output control unit 3 to the first input of the switch 6 control signal that enables the data transfer. During long-term storage media (for several decades), as well as the impact on the media of adverse factors may be a situation when decoding the data recorded in the error correcting code is impossible. In this case, the data can not be decoded, transmitted from the second output of the decoder 5 to the first input of the unit pattern recognition 7, where the recognition of education is a system of pattern recognition, it is advisable to take a sequence of information signals, obtained by correcting the information from the previous successfully decoded defective areas of the media. From the second output unit pattern recognition 7 partially or completely corrected information is transmitted to the second input of the decoder 5, which is another attempt to decode. Quality control is performed recovered data. Thus the estimated probability of correct recognition problem (described in Gorelik L. A. , Skripkin N. A. Methods of recognition. M.: Higher school, 1984). If the information is fully restored, the decoded data is transmitted from the third output of the decoder 5 to the second input of the switch 6. Further, the decoder 5 generates a signal from the first output to the second input of the control unit 3, which is under the influence from the first output control unit 3 to the first input of the switch 6 control signal that enables the data transfer. If the quality of the information being recovered improved cycle "pattern recognition - decoding - quality control" is repeated as long as the information is not restored or if the quality control of the information being recovered is not established that the quality of recovery is not increased (the inability woody from the first output signal to the third input of the control unit 3. After that, the control unit 3 informs the external device about the impossibility of recovering the information read from optical media. The recognition is carried out in conditions of repeated recognition of the state of the object (binary signal) at a constant feature space, stable description of classes (class 0 and class 1").

Thus, due to the integrated use of error-correcting coding and self-learning systems, pattern recognition more reliable recovery of data read from storage media recorded with standard sposobami

The method of reproduction of information recorded in the error-correcting code, mainly on optical media, according to which the information read and decode, restoring when playing with defective sections of the media, wherein the information of defective areas of the media, not restored by decoding it using the self-learning systems, pattern recognition, for a training sample which take a sequence of information signals obtained by correcting the information from the previous successfully decoded the Def is

 

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