SU708403A1 - Device for multichannel magnetic recording of digital information - Google Patents

Description

The invention relates to the field of instrumentation, in particular, to magnetic recording of digital information on a moving magnetic medium, for example magnetic disks, drums, tapes, and is intended to record electrical signals represented in digital form. There are known devices for magnetic recording of digital information, which use a signal containing three time intervals between adjacent zero-intersections located in the ratio of 1: 2: 3 1. The disadvantage of the device is low reliability due to the large number of frequency-dependent elements (delay elements), especially in multi-channel recording. It is known that the parameters of these elements are influenced by the environment. With multi-speed digital magnetic recording apparatus, the number of switching circuits is proportional to the number of elements per jack. The closest in technical essence is a device for multichannel magnetic recording of cellular information, containing an information input and serially connected elements: an input trigger, a first pulse shaper, an OR circuit, an inverter, an AND circuit, a single vibrator, a second pulse shaper, an output OR circuit, an output trigger and magnetic recording unit. The presence of frequency-dependent elements and a large number of other elements in each channel increase the likelihood of equipment 2 failure. The aim of the invention is to increase the reliability of the recording. The goal is achieved by introducing a synchronization unit into the proposed device, the input of which is connected to the synchronization bus of the triple clock frequency, and the first of the outputs is connected to the zero setting input of the trigger input, the output of which is connected to one of the inputs of the OR circuit through the first pulse generator, and the second the input of which is connected to the output of the synchronization unit, and the output is connected to the inverter and one of the inputs to the output cxeN "OR, the second input of which is connected through the second connected in series

a pulse driver and a one-shot are connected to the output of an And circuit, one of the inputs of which is connected to the output of the inverter, and the second to the input of the trigger input and the second of the outputs of the synchronization unit, the output of the output circuit OR is connected to the magnetic recording unit, and the third the output of the synchronization unit is connected to the clock pulse bus.

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

A device for multi-channel magnetic recording of digital information contains a synchronization unit 1, the input of which is connected to the clock input of a tripled clock frequency. The first output of the synchronization unit is connected to the zero setup input of the trigger 2 and one of the inputs of the IZ circuit.

A single input input trigger connected to the information input. A single output input of the trigger is connected to a series-connected first pulse shaper 4 and one of the inputs of the circuit OR 5, the second input of which is connected to the second output of the synchronization unit. The output of the circuit OR 5 is connected to the input of the inverter 6 and to one of the inputs of the output circuit OR 7, the output of the inverter

6 is connected to the second input of the circuit AND 3. The output of the circuit AND 3 is connected to the series-connected single vibrator 8, the second pulse shaper 9 and the second input of the output circuit OR 7, the output of the output circuit OR

7 through the output trigger 10 is connected to the magnetic recording unit 11. The third output of the synchronization unit 1 is connected to the output of the clock pulses. ,

In the recording mode, the synchronization unit 1 (Fig. 1) generates the main clock sequence V and the sequence of pulses Uj and (for example, using a ring counter with a factor of a and b) from the synchronizing pulses of the tripled clock frequency Usf (Fig. 2) input information Uj, y, (j, is tied to the main clock pulses. For transcoding two bits of information into 3, a unit is added to each two bits of information. The sign of the unit produces a synchronization unit (plot and), To assign information. t to the frequency frequency, information pulses arrive at a single input of input trigger 2, to a zero setting input of which a sequence of pulses of 0.2 comes from a synchronization block. From the back edges of the voltage Uj taken from input trigger 2, a first pulse generator 4 is generated and These pulses are mixed with pulses in the two-input circuit OR 5, resulting in a sequence of pulses and. The pulses Ug are inverted by inverter 5 and multiplied with the pulses Ug in scheme I. The pulses U-1 f taken from the output of the And 3 circuit indicate the places where it is necessary to insert tie-ins into the signal imitating the pre-differentiation. The duration of the tie-in forms a single vibrator 8, to the input of which pulses are applied. From the pulse fronts of the single vibrator Ug, pulses are generated from the pulse generator Ug using the second pulse generator 9, which are mixed with pulses Up on the output circuit OR 7. The pulse sequence U is removed from the output of the output circuit OR 7 , is converted by the output trigger 10 into a recorded CBNV-2/3 signal and fed to a magnetic recording unit. A signal is reproduced at the output of the magnetic recording unit. The remaining channels are similar.

Claims (2)

Invention Formula A device for multichannel manit recording of digital information containing an information input and serially connected elements: input trigger, first pulse shaper, OR circuit, inverter, AND circuit, single-oscillator, V7.roy pulse shaper, output OR circuit, output trigger and magnetic recording block, characterized by the fact that, in order to increase the reliability of the recording, a synchronization block is inserted into it, the input of which is connected to the synchronization bus of the tripled clock frequency, and the first of the outputs is connected to zero set full-time input of the input trigger, the output of which through the first pulse shaper is connected to one of the inputs of the OR circuit, the second input of which is connected to the output of the synchronization unit, and the output is connected to the inverter and one of the inputs of the output OR circuit, the second input of which is connected through the serially connected second pulse shaper and a one-shot is connected to the output of an And circuit, one of the inputs of which is connected to the output of the inverter, and the second to the input of the trigger input and the second of the outputs of the synchronization unit, the output of the output circuit And And a trigger output connected to the magnetic recording unit. and the third output of the synchronization unit is connected to the clock pulse bus. Sources of information taken into account in the examination , 1. USSR author's certificate 536511, cl. G11 5/09, 1977. 2. USSR author's certificate No. 537381, cl. G11 5/09, 1977 (prototype).