SU1016819A1 - Device for re-recording digital data to magnetic tape for displaying facilities - Google Patents

Abstract

A RECORDING DEVICE OF A DIGITAL INFORMATION ON A MAGNETIC TAPE FOR DISPLAY MEANS, In which N information inputs of a multi-speed recording unit are connected to the corresponding outputs of a multi-speed reproduction unit, so that, in order to improve the quality of copies of magnetic playback devices, so that, in order to improve the quality of copies of magnetic recordings, they are so that, in order to improve the quality of copies of magnetic media, they are so that, in order to improve the quality of copies of magnetic recordings, they are so that, in order to improve the quality of copies of magnetic recordings, they are so that, in order to improve the quality of copies of magnetic media, they are so that, in order to improve the quality of copies of magnetic recordings, they are so that, in order to improve the quality of copies of magnetic media, they are so that, in order to improve the quality of copies of magnetic recordings, they are so that, in order to improve the quality of copies of magnetic media, they are so that, in order to improve the quality of copies of magnetic media, they are so that, in order to improve the quality of copies of magnetic media, so that they can improve the quality of copies of magnets. preserving recording density when changing the ratio between the speed of the mi- in the playback and recording mode, N pulse shapers connected to the corresponding information outputs of the play block are entered into it z-. the control unit, the INR element, the first frequency divider connected by: the first INPUT with the output OR element, and the frequency multiplying unit connected in series with the first inputs of the second frequency divider for speed and the third frequency divider, and the output of the control unit is connected respectively to the second inputs of the first and third frequency dividers, the synchronization OUTPUT of the playback unit - with the frequency multiplying unit, the second INPUT of the second frequency divider in speed and the third inputs of the first and third divides lei hour- § tots whose OUTPUTS are connected to (L responsibly with the device's synchronization bus and the synchronization With the INPUT of the recording unit, the outputs of the pulse formers — with the corresponding inputs of the OR element, a; the third INPUT of the third frequency divider with the controlling output of the unit play Od CX) f

Description

The invention relates to the technique of magnetic recording and can be used when rewriting digital information from one magnetic tape to another. A device is known in which, when receiving a copy of magnetic tapes, the outputs of the playback unit are directly connected to the inputs of the recording unit C-}. The disadvantage of this device is the poor quality of the obtained copies of the magnetic tapes due to the fact that with transformation ratios greater than 1 (when rewriting recording power on the original and copies are not equal. The closest to the technical essence and the achieved effect to the proposed is a device in which the information inputs of the multi-speed recording unit connect with the corresponding Zykhod of the multi-speed playback device C23. However, this device does not allow to produce copies of magnetic tapes to interface the playback unit with display facilities that are mostly uninformative. Overwrite information / at which playback is performed on V, and the copy is recorded to a decrease in the recording density, which in turn leads to a decrease in the reliability of the recovery of reproduced pulses, since at low densities there are pauses increasing e the number of false impulses at deep levels of formation and reducing the quality of copies of magnetic tapes. The purpose of the invention is to improve the quality of copies of magnetic tapes by maintaining the recording density when the ratio between the speeds in the playback and recording modes is changed. This goal is achieved by the fact that in the rewriting device of digital information on a magnetic tape, in the cohort of N information inputs of a multi-speed recording unit, are connected to the corresponding outputs of a multi-speed playback unit, N pulse shapers connected to the corresponding information outputs of the Playback unit, control unit, OR element, the first frequency divider connected by iiepBHM input to the output of the OR element, and the frequency multiplying unit connected in series with the first inputs of the watt frequency divider frequency and the third frequency divider, the output of the control unit is connected respectively to the second inputs of the first and third frequency dividers, the clock output of the playback unit to the frequency multiplying unit, the second input of the second frequency divider and third inputs of the first and third dividers frequencies whose outputs are connected respectively to the synchronization bus of the device and the synchronizing input of the recording unit, the outputs of the pulse shapers - with the corresponding inputs of the elements ORT, and the third input of the third frequency divider for speed - with the control output of the playback unit. FIG. 1 shows a block diagram of the proposed device; Fig.2 Eschors, explaining the principle of operation. The device consists of block 1 of recording, block 2 of reproduction, block ---- 3 Frequency times multiplied by 1 time, 1 second divider 4 frequencies at times, second frequency divider 5 frequencies in speed: time, third divider 6 frequencies in paragraph y-: –Ü 1 / Time, formers of 7 pulses, of the element OR 8, block 9 of the control. In the above formulas, Vg and V are, respectively, the speed of movement of the magnetic tape during playback and recording. The device works as follows. For ease of description, we assume that the speed of movement of a magnetic tape during playback is half the speed of movement of a magnetic tape during recording. The information (Fig. 2-5 from the output of the playback unit 2 goes directly to the inputs of the caption unit 1 without additional conversions. The synchronization signal (Fig. 2f) from the output of the playback unit enters the frequency multiplication unit 3, the output of which is generated by the pulse sequence, equals ,,. fcA where is the frequency of the synchronization signal at the output of the playback device; n is a constant number. From the output of frequency multiplying unit 3, the pulse sequence is fed to the input of the second divider 5 hours speeds with the value of the division factor Vmctx at the output. V of which a pulse sequence is formed with a frequency equal to f f Ycraa - -F n a v. Thus, the frequency of the pulses at the output of the frequency divider 5 is always and n times

Above the frequency of following the synchronization pulses restored at the output of the playback unit.

The pulse sequence from the output of the frequency divider 5 is fed to the frequency divider 6, at the output of which the oscillating type of square wave is formed (Fig. 2d). As follows from the above plot, the pulse frequency of FIG. The 2-g signal is higher than the pulse frequency of FIG. 2c (i.e., the information (FIG. 2.b) at the output of the recording unit can be viewed as transcoded. The unit (zero binary information at the output of the playback unit corresponds to two units (two zeroes) of binary information at the input of the block Since the recording speed is twice as fast as the playback speed, and the frequency of the synchronization pulses at the output of the playback unit is half the frequency of the synchronization pulses at the input of the recording unit, the recording density on the original and copy of magnetic tapes is annom recording method, such as frequency doubling, will be the same.

FIG. 28 / shows the type of information on the original at the speed of movement

magnetic tape V, and in FIG. 2 and -; the type of information of the copy with the speed of movement of the magnetic tape V 2V.

When restoring a copy to the output of the playback unit, information is restored in the form of a oscillation (Fig. 2MJ and synchronization in the form of an oscillation of the mean type (Fig. 2g),: which is fed to the input of frequency divider 4).

0 divider, impulses are generated, formed by the differences in information Fi.g. 2k) in each channel of driver 7 and. past elements OR 8. Thus, at the output of the divider, 4 frequencies, output syncro 5 is formed (Fig.2l; frequency, for the considered example, two times lower: than when the original is played. Therefore, the proposed device allows to transform -:

0 tion of information in. low hour area i the one more than in Vmcix

times i

vT

)

mm

time,

before

Vmln /

Thus, the proposed device allows to transform information on frequency over wide limits at a constant: recording density on a magnetic tape. and improve the quality of copies of magnetic

0 tapes.

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f f 9 9 g f f r ff 9

 JTJlJ LJTnJTJTJnt

It

Claims (1)

DIGITAL REWINDING DEVICE - ROBE INFORMATION ON MAGNETIC TAPE FOR IMAGES, in which N information inputs of a multi-speed recording unit are connected to the corresponding outputs of a multi-speed playback unit, which is related to the fact that, in order to improve the quality of copies of magnetic tapes by maintaining the recording density when changing the ratio between the speeds in the war mode. works and recordings, N pulse shapers connected to the corresponding information outputs of the reproducer are introduced into it! reference, a control unit, an OR element, a first frequency divider connected to the first input with an output of an OR element, and a frequency multiplication unit connected in series with the first inputs of the second frequency divider in speed and a third frequency divider, the output of the control unit being connected. respectively with the second inputs the first and third frequency dividers, synchronizing the output of the playback unit with the frequency multiplier, the second input of the second frequency divider in speed and the third inputs of the first and third frequency dividers oty whose outputs are connected | responsibly with the device synchronization bus and the synchronizing input of the recording unit, the outputs of the pulse shapers - with the corresponding inputs of the OR element, and the third input of the third divider is often ^- in speed - with the control output of the playback unit * SU .1016819>