SU1053147A1 - Method of multitrack recording/reproducing digital information - Google Patents

Abstract

A METHOD OF MULTI-ROUTE MAGNETIC RECORDING-REPRODUCTION OF DIGITAL INFORMATION by using codes with block-by-block separation, marking and duplication of each information block, followed by searching for marker signals, separating sync signals from the information signal, by comparing the patterns with the patterns and the areas of the patterns and the codes and the codes to the patterns and the codes to the patterns and the patterns and the patterns and the patterns, and the patterns will be the same as-for-mans. Correction of the error, characterized in that, in order to improve the fidelity of recording-reproducing digital information without reducing and density for; In recording mode, the marking signals of adjacent tracks are shifted relative to each other, forming an imp) & Adjustments and record them between the marker and information blocks with the digital signal information frequency, and the duplicate blocks are recorded alternately from the first bit to the last and in the reverse order, in the playback mode when one of the markers is detected for each pair of tracks with the same information t, across all tracks, adjustment pulses, measure and memorize their follow-up period, and form on it the waiting interval of the first bit of information; and for each subsequent bit of information, the corresponding waiting interval is formed over the memorized period of the previous information bit, the indication is present in each waiting interval in the absence of sync signals and memorized together with the bit addresses during playback of which S synchronization failed, and in the absence of W sync signals any of the recording tracks restore them from the sync signals of the other recording tracks, analyzing one. The named bits of the duplicated blocks together with the signs of the absence of sync signals take into account that the first bit of one of the duplicated blocks is compared with the last bit of the other block, and the correction of errors is made by forming block pulses from duplicated OO blocks in which there is no sign of no synchronization. four

Description

The invention relates to magnetic recording, in particular to methods of multi-track magnetic recording-reproduction of digital information. The known method of multi-track magnetic recording of digital information by block separation, duplication and marking on a separate track of each block of information, as well as the correction of individual blocks of information 1. The disadvantage of this method lies in the low fidelity of recording and reproducing information. There is also known a method of multi-track magnetic recording of digital information by using block-division codes, marking and duplicating each block of information, then searching for marker signals, a bit comparison of the codes of the main and duplicate blocks and determining the parity of duplicate blocks with error detection and correction 2. However, for the well-known The method is not characterized by high enough fidelity recording digital information due to the lack of correction reproducible information in case of errors in both duplicate blocks, as well as due to the absence of criteria for selecting undistorted bits and blocks from duplicate carrier tracks. The purpose of the invention is to improve the fidelity of recording-reproducing digital information without reducing the recording density with speed instability and the presence of defective sections of the recording medium. For this purpose, in multi-track magnetic recording-reproduction of digital information by using codes with block separation, marking and duplication of each block of information, followed by searching for marker signals, extracting the sync signals from the information signal, randomly comparing the codes of the main and duplicate blocks and determining the parity of duplicate blocks with detection and correction of errors, in the recording mode, the marking signals of adjacent tracks shift relative to each other, forming t adjustment pulses and record them between the marker and information blocks with the frequency of the digital information signals, and the duplicate blocks are recorded alternately from the first bit to the last and in the reverse order, in the playback mode when one of the markers is detected for each pair of tracks with the same playback information t along all the tracks, the adjustment pulses measure and memorize the period of their following and form the waiting interval for the first bit of information on it, and for each subsequent bit of information The corresponding wait interval is formed by the memorized period of the previous information bit, is recorded in each waiting interval a sign of presence in the absence of sync signals and is stored together with the bit addresses, during playback of which a synchronization error is detected, and in the absence of sync signals on any of the recording tracks, they are restored from the sync signals of the other recording tracks, analyzing the bits of the same duplicate blocks together with the signs of the absence of the sync signals, while ityvayut that the first bit of one of the duplicated blocks is compared with the last bit of the other block, and error correction is carried out pulse formation block of the duplicated blocks in which no sign of lack sinhroni.zatsii. This makes it possible to weaken the effect of microdefects and the instability of the speed of the recording medium on the fidelity of reproduction of digital information, as well as to increase the reliability in case of failure of any of the recording-reproduction channels. The method is carried out as follows. Before recording the digital information on the odd and even tracks of the recording medium, marker signals are recorded, while the marker signals of the even tracks are recorded offset from the marker signals of the odd tracks. The magnitude of the delay is determined by the estimated duration of the defects in the recording medium. After recording the marking signals, the adjustment pulse is recorded with a period equal to the period of the information signal. Digital information, previously divided into blocks, is recorded after the recording of adjustment pulses, with each block of information being recorded on a separate track alternately from the first bit to the last and back. When playing, the search for marking signals is performed and when at least one of the markers is detected for each pair of tracks with the same information, the adjustment pulses are reproduced along all tracks, the waiting interval of the first bit of information for each track is formed separately for each subsequent track. bits, information, the corresponding waiting interval is formed by the memorized period of the preceding information bit. In the waiting interval, between recording the next bits of information, a sign of the presence or absence of synchronization is fixed and memorized together with the addresses of the bits, during playback of which a synchronization failure was detected. In the absence of sync signals to any of the up to | 8-burned recordings, restore them from sync 1053147d

of the other recording tracks, the pulses of a block of duplicate blocks,

giving preference to clock signals, while taking into account that the first bit of one

there is no synchronization synchronized with selected tracks from neighboring tracks on which duplicate blocks. When detecting with the last bit of another block,

errors are carried out. Using the invention allows

comparison of the main and duplicate codes to improve the fidelity of playback and recording

parity check blocks, and correct-digital information, without reducing the error density, forms the formation of the record.

Claims (1)

METHOD OF MULTI-BACK MAGNETIC RECORDING-PLAYBACK OF DIGITAL INFORMATION by using codes with block division, marking and duplication. · Each block of information with subsequent search for marker signals, separation of clock signals from the information signal, bitwise comparison of codes of the main and duplicate blocks and duplicate blocks error correction,; characterized in that, in order to increase the fidelity of the recording-playback of digital information without "reducing the density for _; recordings, in recording mode, the marking signals of adjacent tracks are shifted relative to each other, they form tuning pulses and record them between marker and information blocks with a frequency of digital, information signals, and duplicate blocks are written alternately from the first bit to the last and in reverse order, in the mode playback upon detection of one of the markers for each pair of tracks with the same information reproduce tuning pulses on all tracks, measure and remember the period of their repetition and form the waiting interval of the first bit of information is used on it, and for each subsequent bit of information, the corresponding waiting interval is formed by the remembered period of the previous information bit, the sign of presence is detected in each waiting interval in the absence of clock signals, and it is stored together with the addresses of the bits during playback of which ® synchronization failure, and in the absence of clock signals on any of the recording tracks, restore them from the clock signals of other recording tracks, analyzing the same bits of duplicated blocks together with signs of the absence of clock signals, while taking into account that the first bit of one of the duplicated blocks is compared with the last bit of the other block, and error correction is carried out by generating block pulses from duplicated blocks in which there is no sign of lack of synchronization. >