SU736162A1 - Device for recording and reproducing digital information - Google Patents

Description

The invention relates to automation and computer technology and is intended for use in memory systems with a moving magnetic medium. . 5

Known devices for recording and reproducing digital information [1], but they do not have an increased density of recording information due to its compression during recording. 10

The closest technical solution to the proposed one is a device for recording and reproducing digital information, containing a channel for recording a clock signal, consisting of a recording head, one input of which is connected through a recording amplifier to the synchronizing input of the device and the input of the service word generating unit, 20 formation pulses, each of which consists of a recording head, one input of which is connected through the recording amplifier to the output of the coding unit connected by the first 25 input with the corresponding the information input of the device, and the second with its synchronizing input, the synchronization signal reproduction channel, consisting of the reproduction head 30, connected through the reproduction amplifier and the signal maximum indicator with the synchronizing output of the device, and the information pulse reproduction channel, consisting of the reproduction head connected through series-connected playback amplifier, signal maximum indicator and decoding unit with the first second inputs Lok memory, a third input and the output of which are respectively connected to the clock and outputs information corresponding devices [2].

However, in this device, the information recording density is not high enough, due to the mixing of information pulses and the clock signal when recording.

In order to increase the recording density of information in the device, it contains keys, the output of each of which is connected to another input of the corresponding recording head, a control pulse generator (connected by input * to the output of the service word generation unit and output - with inputs of all keys, threshold elements, AND and NOT elements and registers, moreover, in each of the channels for reproducing information pulses and in the channel for reproducing a clock signal, the input of the indicator of the maximum signal is connected to the inputs of a pair of threshold elements with the outputs with the inputs of the first AND element directly and through the NOT element, the output of the signal maximum indicator in the synchronization signal playback channel is connected to the first inputs of the first and second · registers and the second And element, the second input of which is connected to the outputs of the first And element and the output - with the second input the first register connected by the outputs through the third element And to the second input of the second register, the output of which is connected to the fourth inputs of the memory blocks, and the second inputs of the memory blocks in each playback channel inf rmatsionnyh pulses are connected to first inputs of the second AND gate and a register which is connected through the third output element and to a fifth input of the storage unit and the second input - with the output of the second AND gate, the second input of which is connected to the output of first AND "

Figure 1 shows a functional diagram of the recording channels of the clock signal and information pulses; Fig. 2 is a functional diagram of the synchronization signal reproduction channels and information pulses; Fig. 3 and 4 are timing diagrams of the operation of the recording-reproduction channels.

The information reproduction recording system comprises channels 1.2 for recording, respectively, information pulses and a clock signal, a coding unit 3, a control pulse generator 4, a service word generating unit 5, a recording amplifier 6, a key 7, a resistor 8, a recording head 9, channels 10.11 reproducing, respectively, information pulses and a clock signal, a reproduction head 12, a reproduction amplifier 13, threshold elements 14, 15, a signal maximum indicator and amplifier 16, a decoding unit 17, an 18E-element, a first 19 and a second 20 element s And _r register 21, the third element 22 And, register 23, block 24 memory.

The device operates as follows.

Information pulses (FIG. 3a} and a clock signal (FIG. 36) are fed to the coding unit 3 (FIG. 1), at the output of the i-pulse, a pulse signal is manipulated in phase or frequency, depending on the recording method (FIG. 3c) In this case, this is a frequency-manipulated signal "From the output of block 3, the signal is fed through a recording amplifier δ to the input of the recording head 9 (Fig. Zg).

D: channel 2 recording 1 clock · 1 block 5 generating a signal of the service word Generates a certain combination of a sequence of pulses (Fig.Zd), the repetition rate of which is selected based on the specific parameters of the magnetic recording-playback system. Usually it follows after 100-1000 pulses of the station,

From the output of block 5, the signal is received not by a congestion of 4 control pulses, on. the output of which a pulse is formed (-Fig, Ze), which enters the key 7, Be the time of exposure of these pulses to the key (7 is closed, and the current from the output of the recording amplifier flows through the recording head 9 and resistor 8. In the absence of pulses, the key 7 is open, and recording current flows through the recording head and through the key "

The resistor 8 is used to limit the recording current flowing in the head (Fig.Zh) and is selected from usL O 3 and I, respectively, the magnitude of the recording currents in the presence and absence of control pulses.

The signal from the playback head 12 (Fig. Zi) in each canap enters through the playback amplifier 13 to the signal maximum indicator 16 and threshold elements 14 and 15, at the output of which pulse signals are generated (Fig. Z n, k, m), respectively. The depth of formation of the indicator 16 is chosen much less than the response level of the threshold elements 14 and 15 and is equal to (0.05-0.1) (J _s (Fig. Zi) where U _B is the signal at the output of the playback amplifier 13. The response level of the threshold element 14 is chosen equal to 0.70 and _a (Fig, Zi), and the threshold element 15 is 0.25

The change in the magnitude of the recording current at the time of passage of the service word is selected so as to ensure that the amplitude of the playback signal does not exceed the threshold value for the formation of element 14; Thus, the signal at the output of element 14 should be absent at the time of passage of the service word (Fig. CK).

From the output of the threshold element 15, the signal is inverted by the element 18 NOT (Fig. 3m) and goes to the element .19 And, the second input of which receives the signal from the output of the threshold element 14 (Fig. 3c). At the output of the element 19 AND · a signal appears (Fig. Cp), in the event that a signal occurs on the magnetic tape (if there is no signal at the output of the playback amplifier 13, then the signal is also absent at the input of the element

36 16 2 that 19 I. If there are signals at both inputs of the 19 I element, the signal from its output goes to one of the inputs of the 20 I element, the second input of which receives synchronization pulses (Fig. Zo) from the output of the decoding unit 17 in the playback channel . of information pulses and from the output of the maximum signal indicator 16 in the synchronization signal reproduction channel. At the output of the element

And the pulse sequence is restored (Fig. Sp) similar to the initial pulse sequence '(Fig. Zd), and from its output the pulses (Fig. Sp) enter the register (shifting) 21, the second input of which receives synchronization pulses (Fig. Zl) ) from the output of decoding unit 17.

The outputs of the register (shifting) 21 are connected to the element 22 And in such a way 40 that at the moment of passing the service word, a pulse to set to the zero position (Fig. 3c) is emitted (input mode of information in the memory unit 24). 25

Information pulses and synchronization pulses are supplied to the memory unit from the output of decoding unit 17. The passage of signals in the synchronization signal reproduction channel is similar to that of signals in the information channel, the only difference is that the synchronization signal at the input of element 20 AND and the shift register comes from the output indicator 16 ₇ ς of the maximum signal, from which the signal also goes to the synchronization inputs of reading blocks 24 of the memory of information channels and to the input of the shift register 23, to the second input of which the signal from the output of the element 2 2 And the synchronization channel, '

The number of bits of the shift register 23 is determined by the number of synchronization pulses, to which it is necessary to shift the pulse arriving at its input, i.e., by the amount of shift between the pulse to the zero position during input and the pulse to the same setting during reading. Information pulses are shown in gQ in FIG. 4a, b, and the synchronization signals in FIG.

A service word is formed in the synchronization channel (Fig. 4d) through a certain number of synchronization pulses and a control pulse (Fig. 4d), which is recorded on magnetic tape through all information channels and the synchronization channel simultaneously (Fig. 4e, g, and), respectively. $ 0

In the reproducing device, in each information channel, information pulses (Fig. 4 k, m) are entered into the memory block by synchronization pulses, the counting order of which is determined relative to the setting pulse to the zero position when entering the information of its channel (Fig. 4l, n ) respectively. Reading information simultaneously from all memory blocks of the information channels occurs with a pulse repetition rate of the synchronization channel pulses (Fig. 4o), the counting order of which is determined relative to the installation of the pulse in the zero position of the blocks 24 when reading (Fig. 4p), Thus, the output device compensates for the time mismatches of reproducible signals arising in the magnetic recording path (Fig. 4c, t, y),

The technical effect of the use of the proposed device is expressed in: increasing the longitudinal recording density by 20t30%, in removing the requirements for resistance to distortions, in simplifying the implementation of the playback device, ‘

Claims (1)

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