SU1587578A1 - Device for digital magnetic recording of information - Google Patents

Abstract

The invention relates to the accumulation of information and is intended to record information on a moving magnetic medium. The purpose of the invention is to reduce the error in recording information when the coding information changes during the recording process. To do this, a device containing the analog-digital converter 1, the first register 3, the spectrum analyzer 4, the band decoder 5 types of recording, the counter 6, the code generators 7, the key elements 8, the recording amplifier 9 and the recording head 10 are entered, a comparator unit 12, a pulse shaper 13, and And 14 elements. This allows a pause of a certain duration to be generated at the time of the change of the recording method. 1 il.

Description

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The invention relates to the accumulation of information, namely, devices for digital magnetic recording of information.

The aim of the invention is to reduce the error in recording information when the coding information is changed during the recording process.

The drawing shows a block diagram of a device for digital magnetic information recording.

The device for digital magnetic recording of information contains an analog-digital converter 1, a connected input to the input bus 2, information output to the information input of the first register 3 and through the spectrum analyzer 4 to the output of the range decoder 5 types of recording, which is connected to the installation input of the counter 6, connected by the input with the output signal of readiness of the analog-digital converter 1 and interconnected with the input of parallel recording and the output with input of parallel recording of the first register 3. The first register 3 is connected to the output through a block of 7 shapers of code to the inputs of the block of key elements 8, whose interconnected outputs, through a recording amplifier 9, are connected to the recording head 10.

In addition, the device for digital recording of information contains a second register 11, a comparison unit 12, a pulse shaper 13 and a block of AND elements 14, connected by outputs to control inputs of a block of 8 key elements, first inputs to the output group of the decoder 5, to the input group of the second register 11 and to the first group of inputs of the comparison unit 12. The comparison unit 12 is connected by the second group to the outputs of the second register 11 and the outputs to the inputs of the driver of the 13 pulses connected by an output to the input of the parallel recording of the register 11 and to the second inputs of the block of elements I 14.

The device works as follows.

When the cutoff frequency of the input signal remains constant, the device implements one of the recording methods, and the input signal is converted into a digital form by the analog-digital converter 1 and is fed to the input of the first register 3 and the spectrum analyzer 4.

According to the information from the spectrum analyzer 4, the decoder 5 determines the recording method, generating data for counter 6, which determine the rate at which information arrives in the first register 3 and generates information determining which recording method should be implemented. Data from the output of the first register 3 is fed to the inputs of the drivers of the 7th code, from the output of which to the informational inputs of the key elements 8, and then through one of them (corresponding to the selected recording method) to the recording amplifier 9 and the recording head 10. At the same time, the information stored in the second register 11 coincides with the information at the outputs of the decoder 5, therefore, at the outputs of the comparator unit 12 there is no signal and at the output of the pulse shaper 13 a high level signal is generated that sums the signal from the decoder outputs to control inputs of key elements 8.

At the time of changing the recording method, i.e. when the information at the output of the decoder 5 has changed, a signal is received on one of the outputs of the comparison unit 12, i.e.

the information stored in the second register 11 remained unchanged. Moreover, the appearance of a signal at the output of “More or less.” Less than block 12, the signal appears as the recording method changes, towards

Q decrease or increase the cut-off frequency of the input signal. Depending on which output of the block 12 is compared to the wils signal, the pulse shaper 13 generates a pulse of a certain duration.

5 This impulse will close the elements of AND 14 and record information in the second register 11, with the result that the signal for the course of the comparison block 12 will disappear.

Thus, at the time of the change of the recording method, a pause of a certain duration is formed. During playback, this pause is easily detected and its duration is determined, from which a switch is made to one or another decoding method corresponding to the new recording method following the pause.

Claims (1)

Invention Formula A device for digital magnetic information recording 0, containing an analog-digital converter connected by an input to the input bus, information output to the information input of the first register and through a spectrum analyzer to the input of a recording type decoder 5 connected by the output to the installation input of the counter connected by the input with the output signal of readiness of the analog-digital converter and interconnected input of parallel recording and output with input of parallel recording of the first register, podkl The output of the code shaper unit to the inputs of the block of key elements, whose interconnected outputs are connected to the recording head through the recording amplifier, differing in that, in order to reduce the information recording error when the coding information changes during the recording process, the second register, comparison unit, pulse generator and block 0 1587578 56 And elements connected by the outputs of the second connected, group of inputs to the output control inputs of the block of second-register key switches and outputs to the inputs cops, the first inputs - to the group of the impulse-former, connected the moves of the range decoder vvdov for-exit with an input of parallel recording records, to the group of inputs of the second register and K5 of the second register and with the second inputs of the first group of inputs of the comparison unit, under the elements I.