SU935982A1 - Device for simulating magnetic recording-reproducing channel - Google Patents

Description

(S) DEVICE FOR MODELING THE TRACT OF MAGNETIC RECORDING-REPRODUCTION

one

The invention relates to computing and can be applied to investigate the characteristics of a magnetic recording-reproduction path.

A device for simulating a magnetic recording-reproduction path is known, comprising a differentiation unit, a filter, a sinusoidal voltage generator, a threshold element, an And element, a counter, a delay line, multivibrators, drivers, a trigger, and a key l.

The disadvantages of this device are the complexity of the design, the narrow class of problems to be solved and the low accuracy of the simulation.

The closest technical solution to the invention is a device for simulating a magnetic recording-production path, containing a series-connected random code generator, block. pulse shaping, block

differentiation, filter, read pulse shaping unit and pulse train characteristics measurement unit 2.

However, the known device has low accuracy in determining the time shifts of the reproduced signals due to the overlap of pulses. This is explained by the fact that the use of a differentiation unit and a filter

as an analogue of the reproduction channel, it does not provide a sufficiently accurate path response to a single carrier magnetization reversal.

IS

The purpose of the invention is to improve the accuracy of determining the time shifts of the reproduced signals.

The goal is achieved by the fact that in the device for modeling

30 of the magnetic recording-reproduction path, containing a random generator, the output of which is connected to the input of a recording pulse shaping unit, the output of which is connected to the input of a differentiation unit filter | the output of which is connected oo by the input of the pulse shaping unit reads, the output of which is connected to the input of the measuring unit of the characteristics of the sequence of pulses, adders, registers and the reference pulse generator are introduced, the output of which is connected to the first inputs of the registers; 10 the first and second outputs of the differentiation unit are connected respectively to the second the inputs of the first and second registers, groups of outputs of which are connected respectively to groups of inputs of the first and second adders, the outputs of which are connected respectively Directly to the first and second inputs of the third adder, the output of KOTODOJCD is connected to the input of the filter. The drawing shows a device for simulating a magnetic recording-reproduction path. A device for simulating a magnetic recording-playback track includes a random code generator 1, a recording pulse shaping unit 2, a differentiation unit 3, registers and S, a 6 reference pulse generator, adders filter 10, a read pulse shaping unit 11, and a characteristic measuring unit 12 pulse sequences. The device works as follows. The random code generator 1 generates a random code sequence of ones and zeros, which is fed to the input of the formating block 2 of the write pulses. Unit 2 generates a pulse voltage corresponding to the recording current for the digital magnetic recording method under study. This part of the device simulates the process of recording digital information on magnetic media. The part of the device, consisting of differentiation unit 3, registers 4 and 5 of adders 7-9, generator of reference pulses 6 and filter 10, is an electrical analog of the playback channel. This part works as follows. The differentiation unit 3 generates per registers and 5 pulses when the sign of the derivative of the input signal changes. At the same time, the impulse received at the input of the register k or 5 with the help of impulses of the gene9359

the path of the recording path is a reproducible, for which only the restructuring of the weights of the adders is necessary in order to obtain the required approximation function.

Claims (1)

Invention Formula A device for simulating a magnetic recording-playback path comprising a random code generator, the output of which is connected to the input of a recording pulse generation unit, the output of which is connected to the input of a differentiation unit, the filter output of which is connected to the input of a reading pulse generation unit. 24 of the ratora 6 is shifted through the bits of the register that are connected to the inputs of the adder 7 or 8. Each input of the adder has its own specific weight, determined by the desired form of the response of the playback path to a single magnetization reversal. Thus, at the output of the adder 7, the response of the reproduction path to the remagnetization of the carrier in one direction is obtained, and at the output of the adder in the opposite direction. The adder 9 subtracts the input signals, since their polarities are physically opposite, and the filter 10 performs the smoothing of the input signal, which is necessary due to the discretization of the path response with a pulse rate determined by the oscillator frequency 6 of the reference pulses. Thus, the output voltage of the filter 10, corresponding to the reproduction signal for this code sequence, generator 1, is fed to the read pulse shaping unit 11. The unit 12 for measuring the characteristics of a sequence of pulses determines the statistical parameters of time shifts of clock pulses. Thus, the use of the proposed device provides an increase in the accuracy of measuring the time shifts in the magnetic recording due to the overlapping of pulses by accurately shaping the response of the reproduction channel to the reversal of the carrier. In addition, the proposed device can be used for fashion