SU1030846A1 - Method of recording-reproducing digital information signals - Google Patents

Abstract

Od ZANISI- VbSPROIZVEDENIYa The signals of the digital information based on the current bit write pulses of different polarity and duration, wherein, 4Toi the purpose povaaeni recording fidelity - reproducing, before recording zaderzhivgiot infsfmatsii digital signal sequence for a time ni evoskhod present maximum duration failures group , and write each} bit of two dependent groups of information sequence, the length of KOfOfsax. does not exceed the magnitude of the pulse, with a pulse of one duration, if the values of the recorded and corresponding to it bits of the other group coincide, the other duration - if they do not match, and different polarities dp of different values of the recorded bits, and when playing, they forge from the reproduction pulses and the duplicated signal of digital ifo {4 acyi, in place of distorted or dropped signals - signals of failures, -a from (L of the main sequence of the awn - delayed at the same time output doveliustyu, including in it by signals of failures of sigalv digital and formation of duplicating sequence. about 00 О 00 О5

Description

The invention relates to k instrumentation, in particular to recording methods — playback of a binary yes, and can be used in a variety of digital information storage devices as part of measuring control, control, and calculating devices, including digital video recorders. There is a known method of writing a binary code by the method of returning to zero, based on writing binary symbols with current pulses of different polarity tlj. However, when using such a method, the accuracy of the recording is not enough. There is also known a method of recording reproduction of digital information based on the recording of bits by pulses of current of different polarity and duration C2. A disadvantage of this method is the low reliability of the recording of reproduction of information. The closest technical solution to the present invention is a method of recording - reproducing digital information based on recording dHlroB current pulses of different polarity and duration 31. However, the known method does not provide high reliability of recording - reproducing digital information, since it cannot be used to fix group failures. . The aim of the invention is to increase the fidelity of the recording - reproduction of information. The goal is achieved in that, according to the method of recording reproduction of signals of digital information based on recording bits with current pulses of different polarity and duration, over-recording delays the sequence of signals of digital information for a time longer than the maximum duration of group faults and writes each bit of two depending on the groups of the information sequence, the length of KOTOfujx does not exceed the delay, by one pulse for the duration, if the value of the recordable and corresponding about it, the bits of the other group are the same, of a different duration - if not the same, and of different polarity for different values of the recorded bits, and during reproduction, the main and duplicate sequences of digital information signals are generated from reproduction pulses, Failures, and from the main sequence - delayed at the same time output sequence, including signals of digital information of the duplicate sequence in it by signaling failures. FIG. 1 is a block diagram of an apparatus for implementing cnoco6af in FIG. 2 - timing diagrams explaining the essence of the method; The device (Fig. 1 contains a bit sequence delay unit 1, a recording pulse generation unit 2, a recording unit 3, a control unit 4, a playback unit 5, a playback pulse decryption unit 6 to a delay unit 7, and an output sequence generation. The input unit 1 is connected to an input device, and the output is connected to the input of block 2. Block 2 is connected to the output of block 3, block 4 is connected to the control inputs of blocks 1 and 2, 6 and 7. Block 5 is connected to the output of block b, the output of which is connected to the input of block 7, which is associated with Figure 2a shows the sequence of characters of the binary code to be recorded; Fig. 2.6 shows the delayed pulse sequence of the recording current corresponding to this code in Fig. 2, c shows the sequence of playback pulses; Fig. 2d - Failure signals; Fig. 2, e - the main sequence of bit signals; Fig. 2, e - a duplicate sequence of bit signals; Fig. 2 g - delayed output sequence. When recording, the initial purity of the form of Fig. 2, a) enters the device input and the input of block 1, in which it is delayed by the time tVQ -tfj, exceeding the maximum duration of group faults, conditionally accepted here equal to four bits. In block 2, in a delayed sequence, two dependent blocks of bit pulses (for example, blocks 1 and U, (PI 1U, etc.) are selected) and for each bit of each pair of blocks of a single pulse is formed, for example, short, if the value of this bit and the corresponding bits of the dependent block are the same, and the other duration, for example, is longer, if not. So in Fig. 2.6, the positive pulses of the shorter duration correspond to the unit values of both bits, the greater duration - to the unit value written bits and the zero value of the corresponding bit from the adjacent block. Negative pulses of shorter duration correspond to zero values of the corresponding bit written to the unit value of the corresponding bit from the adjacent block. The sequence of pulses of different polarity and duration formed in the described manner is sent to Jblock 3 records with which recording on a carrier. When playing back a sequence of pulses of the form of FIG. 2.c (the fault bits are conventionally shown as shaded) enters playback unit 5, and from there is fed to the playback pulse decoding node 6, and from there to the delay unit 7 at the time tsQdgQ.np, also exceeding the maximum number of group failures, and shaping the output sequence. In block 6, from each pair of opposite-polarity pulses, corresponding to one period, two bit signals are formed - the main and duplicate, and also formed in place of the distorted (shown in Fig. 2, in a single pulse) and the reproduced signals of the failure signals. Thus, in block b, three signal sequences are obtained: the faulty view of FIG. 2, g, the main informational view of FIG. 2, d and the duplicate infoEFF of the type of FIG. 2, e. From the main information sequence, with the help of block 7, the output form of FIG. 2, g, including in the error signals the bit signals of the duplicate sequence. The use of the proposed method allows to significantly increase the reliability of the recording - reproduction of information. Thus, with the chosen size of dependent information blocks (groups) of information exceeding the experimentally determined maximum frequency of failures, the method provides for automatic detection and correction of failures of almost any frequency. Those rare failures, the multiplicity of which will be greater than the length of the dependent blocks, are detected with a high probability.

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Claims (1)

METHOD FOR RECORDING-PLAYBACK OF DIGITAL INFORMATION SIGNALS, based on recording bits with current pulses of different polarity and duration, characterized in that / in order to increase the fidelity of recording-playback, a sequence of digital information signals is delayed before recording for a time exceeding the maximum duration of group failures, and write down each bit of two dependent groups of the information sequence, the length of which does not exceed the delay value, by a pulse of one duration, if the values are written the discharged and corresponding discharges of the other Group coincide, of different durations, if they do not coincide, and of different polarity for different values of the recorded discharges, and during reproduction, the main and duplicate sequences of digital information signals are forged from the reproduction pulses, in the place of distorted or emitted g-signals failures, and from the main sequence - the output sequence delayed at the same time, including the signals of digital information of the duplicate sequence according to the failure signals telnosti.