SU1205192A1 - Device for checking magnetic recording-reproducing channel - Google Patents

Abstract

The invention relates to the field of accumulation of information, namely, devices for monitoring the magnetic recording-reproduction channel and reduces errors in the control of group errors. For this, the device contains shift registers 1 and 3, adders 2.4 and 5 modulo two, a generator of 6 clock pulses, gate elements 7 and 10, and trigger 8, a counter 9 errors, channel 11 of the magnetic recording - reproduction, elements 12, 14 and a clock pulse shaper 13 provided with a reference frequency signal input bus 15. The generator 6 provides the advancement of information in the first register 1, which together with the adder 2 modulo two generates a pseudo-random sequence of binary symbols coming through the element NOT 12 to the gate element 10, which, in accordance with the pulses of the generator 6, forms a test pseudo-random sequence of rectangular pulses supplied for recording into magnetic recording-reproduction channel 11, the modulo two adder error signal is gated according to clock pulses lementom 7, whose output pulses are counted counter 9 errors. 1 il. (ABOUT

Description

t1

 The invention relates to the field of accumulation of information, namely, devices for monitoring the magnetic recording-reproduction channel.

The aim of the invention is to reduce the error in the control of group errors.

The drawing shows one of the possible variants of the proposed device for monitoring a magnetic recording-reproduction channel.

The device contains the first register of 1 shift, connected by the first and second outputs to the inputs of the first adder 2 modulo two, the second register

3shift, connected by the first and second outputs to the inputs of the second adder

4 on module two, connected by an output to the first input of the third adder 5 modulo two, a generator of 6 such pulses, a gate element

7 and trigger 8. The output of the first adder 2 modulo two is connected to the information input of the first shift register 1 connected by a clock input to the output of the generator 6 clock pulses. The output of the third adder 5 modulo two is connected to the information input of the gate element 7, which is connected by an output to the counting input of the counter 9 errors.

The device also contains an additional gate element 10, connected by an output to the input of channel 11 of the magnetic recording-reproduction and connected by a gate input to the generator output of 6 clocks, the first element NO 12 connected by input to the third output of the first shift register 1, the synchronizer 13 pulses and the second element is NOT 14, the Former of the synchronization impulses 13 is provided with an input bus 15 of the reference frequency signal connected to its first input and connected by the second input to the output channel and 11 magnetic recording-reproduction 5 connected to the first input of the trigger 8. The output of the trigger 8 is connected to the information input of the second register 3 of the shift 5 connected by the third output through the second element 14 to the second input of the third module 3 of the module 5 modulo two. The output of the imaging unit 13 clock pulses connected to the second input of the trigger 8, to the clock input of the second register 3

five

51

&

five

(3

0

 5 0 5 0 5

922

shift and to the gate input gate element 7. The information input of the additional gate element 10 is connected to the output of the first element NO 12,

The control of the magnetic recording-reproduction channel through the proposed device is as follows.

The generator 6 clock pulses promotes information in the first shift register 1, which together with the first adder 2 modulo two forms a pseudo-random sequence of binary symbols coming through the first element NOT 12 to the additional gate element 10. Additional gate element 10 in accordance with the clock pulses of the generator 6 clock pulses form a test pseudo-random sequence of rectangular pulses applied to the recording in channel 11 of the magnetic recording-playback The value you. A reproducible test pseudo-random sequence of pulses arrives from channel 11 of the magnetic recording-reproducing trigger 8 to the driver 13 clock pulses. The latter generates synchronizing pulses that are shifted by half a clock interval relative to a reproducible test pseudo-random sequence of pulses. Each successive playback pulse from channel 11 of the magnetic recording-reproduction flips trigger 8 to the state in which it forms the level of the logical unit recorded in the second shift register 3 by the positive edge of the synchronizer pulse of the synchronizer 13. At the same time, the synchronizing pulse ensures the subsequent transfer of the trigger 8 to the initial state, as well as the advancement of information in the second register 3 of the shift. The information from the second shift register 3 is fed to the second adder 4 modulo two and the second element NOT 14, affecting the third adder 5 modulo two. If the sum modulo two values of the information of the second register 3 shift does not equal zero, then the third modulator 5 modulo two generates an error signal in the form of a level

logical unit

Error signal

The third adder 5, modulo two, is gated in accordance with the synchronization pulses by the gate element 7, the output pulses of which are counted by a counter of 9 errors.

Claims (1)

Invention Formula A device for monitoring the magnetic recording-playback channel, containing the first shift register connected by the first and second outputs to the inputs of the first modulo-two adder, connected to the information input of the first shift register, the clock input of which is connected to the output of the clock generator, the second shift register connected the first and second outputs with the inputs of the second modulo two adder, connected by an output to the vocal input of the third modulo two adder, the output of which is connected to the information the ion input of a gating element connected by an output to the counting input of an error counter, and a trigger, characterized in that, in order to reduce the error Editor M. Kelemesh Order 8533/53 Compiled by Yu.-K.V. Rosenkrantz Tehred 3.Paliy Proofreader V. But ha  Circulation 583 Subscription BNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Ra vice embankment, 4/5 Branch PPP Patent, Uzhgorod, st. Project, 4 when monitoring group errors, an additional gate element is added to it, connected by the output to the magnetic recording-reproduction channel input and connected by the gate input to the clock generator output, the first element NOT connected by the input to the third output of the first shift register, the clock generator pulses, provided with a reference frequency signal bus connected to its first input and connected by a second input to the output of a magnetic recording-reproduction channel connected to the first input is a trigger, and the second element is NOT, and the trigger output is under-. connected to the information input of the second register connected by the third the output through the second element is NOT with the second input of the third modulo two adder, the output of the shaper pulse generator is connected to the second input of the trigger, to the clock input, the second shift register and to the building input of the gate element, and the information input of the additional gate element is connected to the output of the first element NO.