SU1385138A1 - Device for two-channel magnetic recording of blocked digital information - Google Patents

Abstract

This invention relates to the accumulation of information. The purpose of the invention is to increase the recording density by reducing intersymbol effects. The write clock pulses are counted by the counter 27 when a code reaches a certain value determined by the block length, the decoder 26 is triggered, the output pulse at one of the outputs of which changes the state of the trigger 22. And 25 is closed and the And 16 element opens. element 16 is fed to a frequency divider 15, the division factor of which determines the physical distance between the information signals and the pause between information blocks. From the output of the divider 15, the pulses through the elements OR 10, 11 and 17 arrive at the counting inputs of the flip-flops, causing a change in the carrier magnetization on parallel tracks with a reduced frequency. The pause signal is recorded in magn. the carrier during the time specified by the pulse counter 27 before the pulse arrives through bus 3 for receiving bus 2 of a new information block. 2 Il. i (L

Description

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The invention relates to the accumulation of information, namely, devices for dual-channel magnetic recording of block digital information.

The aim of the invention is to increase the recording density by reducing intersymbol effects.

FIG. 1 shows a functional diagram of the device; in fig. 2 - time diagrams of his work.

The device for two-channel magnetic recording of block digital information contains a shift register 1 connected by inputs to the information bus 2, a control input to the control bus 3, a synchronizing input to the synchronization bus 4 and an output to interconnected first inputs of the first and The second elements And 5 and 6 and the input of the first element NOT 7, connected by an output to the first inputs of the third and fourth elements And 8 and 9, connected by outputs to the first inputs of the first and second elements, OR 10 and I. The second element t OR 11 is connected by output through serially connected first trigger 12 and recording amplifier 13 to first magnetic head 14 and second input to interconnected output of first element OR 10. connected by second input to output of first element 5 and third input through divider 15 frequencies to the output of the fifth element AND 16, and the first input of the third element OR 17, connected by an output through serially connected second trigger 18 and recording amplifier 19 to the second magnetic head 20 and the second input to the output of the second element And 6. The second element AND 6 is connected by the second input to the output of the fourth element OR 21 and the second input of the third element AND 8 and the third input to the interconnected third input of the third element AND 8, the second input of the fourth element And 9 connected by the third input to the second input of the first element And 5 and the clock input of the register 1 shift. The third trigger 22 is connected to the first input of the first element And 16 of the first output. In addition, a device for two-channel magnetic recording of block digital information contains the second and second elements 23 and 24 connected by the first inputs to the outputs of the first trigger 12, the second inputs to the outputs of the second trigger 18 and outputs to the inputs of the fourth element OR 21, the eighth element AND 25 connected between the synchronization bus 4 and the synchronization input of the shift register 1 and connected by one of the inputs to the second output of the third trigger 22, p therefore connected decoder 26 and the pulse counter 27 included 22 and control bus 3, wherein the pulse counter 27 between the third flip-flop inputs under

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keys counting input to the sync bus 4, and the second element is NOT 28 connected by the input with the output of the fourth element OR 21 n output - with the third input of the fourth element And 9.

The diagram "ha" (see Fig. 2) shows the block digital information to be recorded, in diagrams "b and" c - changes in the magnetization of the recording medium on two parallel tracks using a known device, and in diagrams "g," g and "e - the same for this device.

The device works as follows.

When a pulse arrives at the control bus 3, a counter is installed.

27 pulses in the initial state and receiving the code from the information bus 2 into the shift register 1. The element And 25 is open by the signal from the trigger of the trigger 22, therefore the write clock frequency pulse on the bus 4 passes the element 25 and produces the output of the first received information block to the elements 5 and 6 and to the element NOT 7. Suppose that in the first cycle it is necessary to record a unit of code on a magnetic medium (not shown). In this case, the unit is recorded with the same state of carrier magnetization on parallel tracks (see diagrams "g," L and "e, fig. 2). Elements And 23 and 24 fix opposite states of flip-flops 12 and 18. Therefore, output signal of element OR 21, inverted element NOT 28 in case of coincidence of conditions of flip-flops 12 and 18, opens element And 5 and the write clock pulse coming through slit 4 And 25, element 5 passes, elements OR 10, 11 and 17 and overturns the triggers 12 and 18, thereby causing changes in the carrier magnetization on parallel tracks with the help of recording amplifiers 13 and 19 and magnetic recording heads 14 and 20. If the initial states of the triggers 12 and 18 are opposite when the unit is written in this cycle, the AND 6 element is open. Therefore, the write clock from bus 4 through AND 25 passes through AND 6 and overturns trigger 18, causing a change in magnetization the carrier is only on one of the parallel tracks. When writing a zero code, the device works in the same way, only with the difference that the output potential of the NOT 7 element provides the resolving potential for the And 8 and 9 elements. the incoming signal comes from the item NOT

28 and the AND 9 element, through which the write clock pulse passes to the OR element 11 and changes the state of the trigger 12. At different initial conditions of the triggers 12 and 18, the AND element 21 opens the element And 8, through which the clock

the write pulse passes the elements OR 10, AND and 17, and overturns the triggers 12 and 18. In the same way, the device works further when recording the whole block of information. The write clock pulses are counted by the counter 27 when a code reaches a certain value, determined by the block length, triggers the decoder 26, the output pulse at one of the outputs of which changes the state of the trigger 22. At the same time, the element 25 closes and the element 16 opens. the write pulses through the element 16 are fed to a frequency divider 15, the division factor of which determines the physical distance between the information signals and the pause between information blocks, in particular the division ratio can be two veins (see diagrams "g," d and "e, fig. 2). From the output of the divider 15, the pulses through the elements OR 10, 11, and 17 arrive at the counting inputs of the flip-flops 12 and 18, causing a change in the carrier magnetization on parallel tracks with a reduced frequency. Thus, the pause signal is recorded on a magnetic medium during the time specified by the pulse counter 27 before the pulse arrives on bus 3 for receiving bus 2 of the new information block.

Claims (1)

Invention Formula A device for two-channel magnetic recording of block digital information, containing a shift register connected by inputs to a data bus, a control input to a control bus, a synchronizing input to a synchronization bus, and an output to interconnected first inputs of the first and second And elements and an input the first element NOT connected by an output to the first inputs of the third and fourth elements I, connected by outputs to the first inputs of the first and second, respectively 0 the OR element, the second of which is connected via an output through a serially connected first trigger and recording amplifier to the first magnetic head and a second input to interconnected upstream of the first OR element connected by a second input to the output of the first element AND and a third input through a frequency divider to the output n of the element And, and the first input of the third element OR, connected by the output through a series-connected second trigger and amplifier to the second magnetic head and the second input to the output of the second element that AND, connected by the second input to the output of the fourth the OR element and the second input of the third element AND and the third input - to the third input of the third element AND interconnected to the second input of the fourth AND element, connected to the third input to the second input of the fifth And element, to the third 0 to the input of the first element AND and the synchronizing input of the shift register, as well as the third trigger connected by the first output to the first input of the fifth element AND connected by the second input to the synchronizing bus, characterized in that in order to increase the recording density by reducing intersymbol influences , the sixth and seventh And elements are entered into it, connected by the first inputs to the outputs of the first trigger, the second inputs to the outputs of the second trigger and outputs to the inputs of the fourth element OR, the eighth And element connected between the sync bus and the sync input of the shift register and connected by one of the inputs to the second output of the third trigger, 5 are connected in series a decyfrater and a pulse counter connected between the inputs of the third trigger and a control level, the pulse counter being connected by a counting input to the synchronization bus, and the second element is NOT connected to the input with the output of the fourth element I. five