SU862195A1 - Device for reproducing digital information from magnetic record carrier - Google Patents

Description

one

This invention relates to magnetic recording.

A device for reproducing digital information from a magnetic recording medium is known, comprising reproduction channels,; each of which consists of the included successively reproducing head, the reproduction amplifier and the amplitude equalizer til.

 This device has a relatively simple design, but does not allow for the reproduction of digital information recorded with a sufficiently high density. It is also known a device for reproducing digital information from a magnetic recording medium, comprising a command generation unit, an input sync signal bus connected to a summation and pulse generating unit, and reproduction channels, each of which consists of a pulse imprinter provided with output digital data buses , and from a reproducing head, a reproduction amplifier, an amplitude equalizer, a low-pass filter, a full-wave

the rectifier, the differentiator, the comparator and the element of the choice of the reference voltage, the output of which is connected to the input of the last L2.

This device allows the reproduction of digital information recorded with relatively high density. The disadvantage of it is significant error

10 reproduces digital information from a magnetic recording medium.

The purpose of the invention is to reduce the reproducibility of the reproduction of digital information from magnetic storage media.

15 records.

This is achieved due to the fact that each playback channel contains an integrator connected in series, which is connected to

20 by its comparator, an additional comparator, a matching element, a pulse width former, a trigger, an And element, and an electronic switch connected to the output

25 to the entrance of the pulse generator rgo; the playback channel, the differentiator of which is connected to one of the inputs of the summation and pulse shaping unit. With this in

Claims (1)

The 30th playback channel, the inputs of the trigger and the element I, are connected to the outputs of the summing and shaping unit (pulse alignment, and the inputs of the electronic co-switch are connected to the pulse width generator and to the command generation unit, the outputs of which are connected to the inputs of the amplitude equalizer, low frequency filter, differentiator and integrator the playback channel. The drawing shows a structural electrical circuit of the proposed device, the proposed device contains playback channels i, each of which consists of and A shaper 2 of pulses made with output buses 3 of digital information and from a repetitively connected reproducing head 4, a reproduction amplifier 5, an amplitude equalizer 6, a low-pass filter 7, a two-half rectifier 8, a differentiator 9, a comparator 10 and element 11 selection of the reference voltage, the output of which is connected to the input of the latter.Each playback channel also contains an integrator 12 connected in series, the input of which is connected to its comparator 10, an additional computer 13, g s the talking element 14, the pulse width driver 15, the trigger 16, the C 17 element and the electronic switch 18. In this case, the output of the electronic switch 18 is connected to the pulse driver 2 input, and the differentiator is connected to one of the inputs of the summation unit 19 the formation of pulses connected to the input bus 20 of the synchronization signal,. In each playback channel, the inputs of the trigger 16 and element 17 are connected to the outputs of the summation and pulse shaping unit 19, and the inputs of the electronic switch 18 to the pulse width former 15 and the command generation unit 21. The outputs of the unit 21 are connected to the amplitude of the lower filter 7 equalizer inputs frequency, differential ator 9 and integrator 12 of each playback channel. The proposed device provides reproduction of digital information recorded in a way without returning k to zero in both parallel and serial code. Here, the command generation unit 21 and the summation and pulse generation unit 19 control the amplitude corrector b, the low-pass filter 7. differentiator 9, integrator 12, trigger 16, element 17 and electronic switch 18, which in each channel transform the signal from actions from reproducing head 4, using the invention significantly reduces the reproduction error of digital information from magnetic recording media. Claims An apparatus for reproducing digital information from a magnetic recording medium, comprising a command generation unit, a sync signal input bus connected to a pulse summing and pulse generating unit, and reproduction channels, each of which consists of a pulse maker, complete with digital output buses information, and from a reproducing head, connected in series, a reproduction amplifier, a c1 amplitude equalizer, a low-pass filter, a double-wavelength pickup, a di the differential voltage switch, the comparator and the selection element of the reference voltage, the output of which is connected to the input of the latter, characterized in that, in order to reduce the error in the production of the day, each playback channel contains an integrator connected in series, the input of which is connected to its comparator, an additional comparator , matching element, pulse shaper, trigger, And element and electronic switch connected by the output to the pulse shaper input of the same playback channel, differentiated Which is connected to one of the inputs of the summation and pulse shaping unit, in each playback channel, the inputs of the trigger and the AND element are connected to the outputs of the summation and pulse shaping units, and the inputs of the electronic switch are connected to the pulse width former and to the command generation unit whose outputs connected to the amplitude equalizer, low-pass filter, differentiator and integrator of each playback channel. Sources of information taken into account in the examination 1, Aksenov V, A, and others. Accurate magnetic recording, M ,, Energie, 1973, p. 5-7, 2, US Patent No. 3778792, class, 340-174.1 , 1973 (prototype).