SU940217A1 - Device for adaptive processing of magnetically recorded digital signals - Google Patents

Description

one

The invention relates to magnetic recording, in particular, devices for adaptive processing of magnetic recording of digital signals.

A device for magnetic recording of digital signals is known, comprising a digital signal conversion unit connected to a recording amplifier capable of recording high density digital signals. )about

The disadvantage of this device is a decrease in recording density due to the effect of intersymbol interference. 15

It is also known a device for adaptive processing of magnetic recording of digital signals comprising serially connected shift register, a decoder, a shift pulse circuit 20 and a recording amplifier, to the second input of which an output of an error extractor is connected, the inputs of which are connected to the outputs of a decoder, and

There is also a synchronization unit, the outputs of which are connected to the synchronizing inputs of the shift register and the pulse shifting circuit.

A disadvantage of the known device is the possibility of increasing the recording density while adaptively processing only three frequencies (x digital signals).

The purpose of the invention is to increase the recording density by adaptive processing of magnetic recording of digital signals.

Claims (1)

The goal is achieved by the serially connected analogue of the recording and playback path and the pulse regenerator, the output of which is connected to the input of the second shift register, the block of logic elements AND, whose information inputs are connected to the outputs of the second shift register, are entered into the device for adaptive processing of magnetic recording of digital signals, and 39 synchronization input connected to the third output of the synchronization unit digital-to-analog converter, the information inputs of which are connected to the outputs Lok AND gates and to the information input of the first shift register, a clock input coupled to the fourth output of the synchronization unit, and an output coupled to a control input of write amplifier "The figure shows the proposed device. The device contains successively connected first register 1 shift ha, counting trigger 2 and amplifier 3 records, second register, synchronization unit 5, the first and second outputs of which are connected to the clock inputs of the first and second registers 1 and the shift also contains serially connected the analogue of the recording-reproduction path 6 and the pulse regenerator 7, the output of which is connected to the input of the WTO ry shift register, is a block of 8 I logical elements, informational; the inputs of which are connected to the outputs of the second shift register k, and the synchronization input is connected to the third output of the synchronization unit 5, the digital-to-analog converter 9 whose information inputs are connected to the outputs of the logical unit 8 And and to the information inputs of the first shift register 1, the synchronization input is connected to the fourth output of the synchronization unit 5, and the output is connected with the control input of the amplifier 3 records. The device works as follows. The output signal from the analogue of the recording-reproduction path 6, whose amplitude-frequency characteristic coincides with the amplitude-frequency characteristic of the real path, is fed to a pulse regenerator 7, forming a sequence of square pulses, which is written to the second register k at a speed greater than the speed of the pulse sequence on the output of the pulse regenerator 7 in the number of times equal to the memory volume of the second shift register. At the moment of time determined by the synchronization unit 5, the information from the second Sliding 4 th register n is recorded into the first shift register 1 4 so that the logical unit is recorded in the cell of the first shift register 1, in which the pulses are shifted with respect to pulses in the secondary cell of the same register by the amount of offset of the logical units in the cells of the second shift register k. From the output of the first shift register 1, the digital information in the serial code through the counting trigger 2 is fed to the input of the recording amplifier 3, to the control input of which a signal is output from the digital-to-analog converter 9, which changes the recording level when the interval between adjacent edges of the digital signal changes . The use of the invention makes it possible to significantly increase the recording density of digital signals by adaptively processing magnetic recording of digital signals by reducing the effects of intersymbol interference and jitter of pulses. Apparatus of the Invention A device for adaptive processing of a magnetic recording of digital signals, comprising a serially connected first shift register, a counting trigger and a recording amplifier; The second shift register, the synchronization unit, the first and second outputs of which are connected to the synchronization inputs of the first and second shift registers, characterized in that, in order to increase the recording density, the serially connected analogue of the recording-reproduction path and a pulse regenerator are inputted to it, to the input of the second shift register, the block of logical elements And, the information inputs of which are connected to the outputs of the second shift register, and the clock input is connected to the third output of the block / synchronization, a digital-to-analog converter whose information inputs are connected to the outputs of the AND block and to the information inputs of the first shift register, the synchronization input is connected to the fourth output of the synchronization block, and the output is connected to the control input of the recording amplifier.