SU777697A1 - Device for high-density digital magnetic recording - Google Patents

Description

pa delays, and the inverted input of a three-input element AND are connected in parallel to another direct input of the first two-input element I, informational inputs of the delay trigger and the device, and the third output of the generator are connected in parallel with a synchronizing input of a universal two-input element And, another direct input my input of which is connected to the single output of the universal trigger, besides, the outputs of the first two-input and three-input elements of the AND in parallel are connected New elements: m OR, the output of which is connected in parallel to the inverse input of the single state installation and the direct inputs of the installation and separate installation of the zero state of the universal trigger, and between the output of the OR element and the magnetic recording unit are connected in series a counting trigger and one adder on module two, the other input of which is connected to the output of the second two-input element And connected to the universal trigger.

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

A device for high-precision magnetic recording of digital information contains a master oscillator 7, one of whose inputs is connected to a synchronization input trigger trigger 2 delay and a direct input two-input element And 5 (see. Fig. 1). To the other generator output / direct input input is a three-input element AND 4. The inverse output of trigger 2 is connected to another direct input of element AND 4. The inverse input of element AND 4, the other direct input of element And 3 and information input of trigger 2 are connected to information input devices. The outputs of the elements And 3, 4 are combined with a two-input element OR 5. The output of the element OR 5 is connected in parallel :, the counting trigger 6 and the inverse /, direct K and zero setting inputs of the universal trigger 7. To the unit output of the trigger 7 are connected in series with one input two-input element And 8, one input modulo two 9 and block 10 magnetic recording. Another input element And 8 and the clock input of the trigger 7 is connected to the third output of the generator /. The other input of the adder 9 is connected to a single output of the trigger 6.

The input information binary sequence and, 1,. ((See Fig. 2), in which the units correspond to a high voltage level during a clock cycle, and zero m - a low level, is fed to the information input of the delay trigger (D-flip-flop) 2 The sync input of trigger 2 receives clock synchronization after 5

(7--), generated by master oscillator 1, which is a series of pulses of duration G / 4 (T is the duration of a cycle). From a single output of trigger 2, the voltage f / 2 is removed, which is an information sequence delayed by / 4 T and "F. Sequence / 7" "f. Also goes to element 3, where the clocks are gated8

mi sync pulses With / -. From the output of the And 3 element, the sequence of pulses f / 3, which is a pulse waveform (f), is removed. Voltage 2, taken from the zero output of trigger 2, goes to the And 4 element, where it is multiplied with the signal Y f ,, f and tacts .. and

Mi sync pulses and., Different

from sync pulses ij only a shift to

7/2. At the output of the And 4 element, a sequence of f / 4 pulses is formed. The pulses and are mixed with t1 / 3 pulses per

the element OR 5. Mixed pulses f / s, taken from the output of the element OR 5, are converted to a counting trigger 6 into a signal t / 6 containing intervals of duration T, 1.5G and 27; Simultaneously pulses U

are fed to the inverse / and forward K and zero setting inputs of the universal trigger (// (- trigger)) 7. The sync input to the synchronization input of this trigger is

Pulses - doubled clock frequency

you. The trigger voltage 7 is removed from the single output of the voltage UT, which corresponds to the following operation / D-flip-flop algorithm.

.Notes

The X sign indicates that the logical state at the input is valid.

The change in the state of the output trigger occurs at the transition from "1 to" O at the input C.

The voltage U is gated with clock pulses of doubled clock frequency and

on the two-input element AND 8. As a result, impulses "box / 8" are formed at the output of the element And 8. / 8 modulo two with voltage t / 6 using adder 9 according to the rule

The voltage f / g, taken from the output of the adder 9 is recorded on a magnetic medium using the unit 10 magnetic recording.

In the UK diagram, the waveform of the reproduced signal is shown when recording with or without frame inserts (dotted lines). It is not difficult to see that the tie-ins make it possible to achieve a much greater accuracy in restoring the original relations between the null-intersections of the signal.

The device differs from the specified prototype by the complete absence of frequency-dependent elements, which allows efficient use of this in multi-speed magnetic recording devices.

Claims (1)

Invention Formula A device for high-density magnetic recording of digital information, comprising a master oscillator, And elements, LRI, triggers and a magnetic recording unit, characterized in that, in order to simplify the device, the delay input trigger and the first two-input element are connected to one of the outputs of the master oscillator in parallel by a synchronization input, and the three-input And, the other direct input of which is connected to the zero output of the delay trigger, and the inverse input of the three-input element And in parallel is connected to the other: the direct input of the first two-input element And onnym inputs and trigger delay device, and to a third output of the generator are connected in parallel synchronizing universal input trigger and direct input of the second two-input AND gate, the other direct input of which is connected to the single output of the universal trigger, in addition, the outputs in parallel of the first two-input and three-input element And are combined by the two-input the OR element, the output of which is connected in parallel to the inverse input of the unit state installation; and direct inputs of the installation and separate installation of the zero state of the universal trigger, and between the output of the OR element and the block of the magnetic recording are connected in series the counting trigger and one modulo two adder, the other input of which is connected to the output of the second two-input element AND connected To the universal trigger. Sources of information taken into account during the examination: 1. British Nant AB 1350233, cl. G 4 s, publish. 1974. 2 USSR Author's Certificate No. 574748, cl. G 11 B 5/09, 1977 (prototype).