SU503281A1 - Device for magnetic recording and reproducing digital information - Google Patents

Description

one

The invention relates to the field of instrumentation.

A device for magnetic recording and reproducing digital information is known, containing autonomous recording and reproducing paths, in the first of which buffer cascades and triggers are connected to magnetic recording heads, and in the second, synchronization and reproduction channels are connected to reproduction heads. The known device is designed for high information recording density on magnetic media. But when operating such a device in the case of insufficiently high recording density, the immunity of the entire device is reduced.

To increase the noise immunity of the device to temporal shifts or displacements of the reproduced pulses with a low information recording density in the proposed device, each synchronization channel is equipped with an electrical circuit connected between the adder and the AND circuit and consisting of an successively positive and negative half-waveform of the reproduced signal trigger operating in a split run mode.

And, the frequency divider and the trigger operating in the counting start mode, the input of which is connected to the second input of the newly introduced trigger operating in the

separate start, while one of the synchronization channels is additionally equipped with a frequency multiplier connected between the point of connection of the imaging unit at the extremum with the trigger operating

in the separate start mode, and the point of connection of identical terminals of both circuits "And the newly introduced electrical circuits of the synchronization channels.

FIG. 1 shows a block diagram of the recording path of the described device; in fig. 2 is the same, the reproduction path of the digital information signals.

The recording path contains triggers 1, connected via buffer cascades 2 to magnetic recording heads 3, to which triggers of 4 synchronization pulses (sync pulses) are connected.

In the path of reproduction, shapers 6 are connected to the same magnetic heads 5 by extreme values of the information signals and adders 7 connected by

with the formers 8 according to the extremum of the positive and negative half-waves of the reproduced signal of the clock pulses. Shaper 6 is connected to the circuits “And 9 and 10, the first of which works with even mp-pulses, and the second - with odd ones. Triggers And and 12 work with similar pulses. The circuit also uses shapers of 13 reset pulses, circuits "And 14," OR 15, 16. Shaper 6, circuits "And 9 and 10, triggers 11 and 12, and circuit" OR 15 enters channel 17 informational signals. Shaper 8 with adder 7 and "And 14," OR 16 circuits, as well as trigger 13, is included in synchronization channels 18. In one synchronization channel, frequency multiplier 19 is used and trigger 20 is used in each such channel separate start, trigger 21, operating in the counting start mode, the & 22 scheme and the frequency divider 23. The division of pulses into even and odd is purely arbitrary. The formation of these pulses is performed when they are used for the reset mode as follows. From the outputs of the flip-flops 21, the signals are sent to the “And 14 sync channel circuits. At the inputs of these circuits, pulsed signals are formed, the back edge of which triggers reset pulses, which are triggered 13, i.e. at the output of one trigger, in this case trigger 11, even pulses are generated, and at the output of another trigger 12 odd impulses. The signals from these triggers in each information channel are differentiated and summed up in the "OR 15" circuit, and at the output of the "OR 16" circuit, synchronization pulses are generated.

Claims (1)

Invention Formula A device for magnetic recording and playback of digital information, containing 5 autonomous paths of the same name, in the first of which buffer cascades and triggers are connected to the magnetic recording heads, and in the second one information channels are connected to the magnetic playback heads; AND schemes, two triggers, and OR schemes, as well as combined synchronization channels, consisting of an adder, 5 of the AND circuit and the reset pulse generator, characterized in that, in order to increase the noise immunity to the temporal displacements of the reproduced pulses with a low recording density, each synchronization channel is provided with an included circuit between the adder and the AND circuit, consisting of serially connected generator the extremum of positive and negative half-waves reproducible 5 signals, a trigger operating in the split start mode, the AND circuit, a frequency divider and a trigger operating in the counting trigger mode, the input of which is connected to the second input of a newly introduced trigger operating in the separate trigger mode, one of the synchronization channels is additionally equipped a frequency multiplier connected between the linker point of the former at the extremum with the trigger operating 5 in the mode of separate start, and the connection point of identical terminals of both schemes And the newly introduced electrical circuits of the synchronization channels.