SU838715A1 - Device for recording and reproducing digital information - Google Patents

Description

The invention relates to instrumentation and can be used when recording and reproducing digital information on magnetic media.

A device for recording and reproducing digital information on magnetic media is known using pulse-width modulation, comprising a playback head connected to an input unit whose output is connected to the corresponding counter input and to a driver input, while the output of the latter is connected to one of the inputs of the recording unit and accumulation of information, to the corresponding inputs of the triggers and to the reset input, of a counter, the outputs of which are connected to other inputs of the triggers, and the corresponding inputs of the counter Ic is connected to the output of the clock pulse generator; the outputs of the flip-flops are connected to the corresponding inputs of the recording and accumulation unit 1.

The disadvantage of the device is the low efficiency of the decoding of the recorded control commands when writing information in an arbitrary code.

The most technically advanced device is a device for recording and reproducing digital information, containing serially connected input drive, modulator, output unit and recording head, recording control unit connected to the input control input device and through the pulse distributor to control inputs - I will give the modulator, as well as sequentially connected to the playback head, the input unit, the analysis unit of pulse-width parcels and the recorder, the playback control unit, the first in stroke which is coupled to the second input registrar 23Nedostatkom known device is the low efficiency in the recorded decoding control commands for recording information in an arbitrary code.

The purpose of the invention is to simplify the analysis of control commands and increase the recording density.

The goal is achieved by the fact that a command block is inserted into the device for recording and reproducing digital information, connected between the third output of the writing control block and the individual inputs of the modulator, the command feature analysis block, connected between the output of the pulse-width modulated parcel analysis block and the second and the third inputs of the playback control unit, as well as the decoder, the first input of which is connected to the output of the recorder, la the second input and output are connected to the corresponding output and input of the control unit reproduction. FIG. 1 is a block diagram of a recorder and player of digital information J in FIG. 2 time diagrams of his work. A device for recording and reproducing digital information; it also contains an input storage device 1, whose information inputs are connected to an external device (the information outputs are connected to the modulator 2, and the control input is connected to the output of the recording control unit 3, the other outputs are connected to the control inputs of the distributor 4 pulses and the block of 5 commands, the control inputs of the record control block 3 are connected to the corresponding control outputs of the external device (information source), the outputs p the pulse distributor 4 and the command block 5 are connected to the corresponding inputs of the modulator 2, the output of which is connected to the recording head 7 via the output unit 6; In the receiving part, the device contains a playback head 8, which is connected to the input of the base unit 10 through the input unit 9 pulse modulated parcels and to the input of the playback control unit 11, one group of output of which is connected to the control inputs of the recorder 12, another group of outputs connected to the corresponding-inputs of the decoder 13, and a third of Upp outputs are connected with an external device (information receiver), outputs of analysis block 10: pulse-width modulated parcels 10 are connected to the corresponding inputs of the recorder 12 and command characteristic analysis block 14, the outputs of which are connected to the corresponding inputs of the playback control block 11 of the recorder 12 are connected to the inputs of the decoder 13 and to the information inputs of the external device (information receiver). The device operates as follows & time. The information supplied to the input of accumulator 1 (Fig. 2d) is converted by means of modulator 2 into pulse-width modulated parcels (Fig. 2c) and is recorded onto magnetic media through output unit b and recording head 7. At the beginning of each sign of information on the control signals from. a pulse distributor 4 a marker is formed (Fig. 2L). at certain points between information signs, control commands are written as a sequence of markers having a corresponding length, for example two markers, and a sign of the control command, and a binary code of the necessary size, for example, three-dimensional measures, which determine the number of control marks commands, in block 3 of the recording control, under the influence of signals from an external device (information source) (Fig. 2a), signals are generated that control the block 5 of commands and the distributor 4 impulses. The unit 5 of commands and the distributor of 4 pulses give out signals that control the modulator 2 (Fig. 2b), which records the control commands. When reproducing the recorded information, the latter from the playback head 8 enters the input block 9, where the incoming signals are amplified, converted by level and fed to the block 10. Analysis of pulse-width modulated parcels, which analyzes the durations of different polarities for each received bit and marker, em marker and determine the value of accepting bits (Fig. 2e, e, g). Each signal about the received marker from the pulse-width modulated parcel analysis unit 10 is fed to the input of the analysis unit 14 an indication of commands that generates the corresponding signals depending on the number of markers received in the sequence. Block 14 analysis of the recognition of commands can work in two re-. Clicks: reception mode of one marker (device reception of information byte); the mode of receiving a group of markers (the device receives a control command code). Depending on the mode of operation, the unit 14 for analyzing the command feature issues to the playback control unit 11 the corresponding signals (Fig. 2n, m). In the information byte receiving mode, the playback control unit 11 generates control signals for the register 12 and the external device (information receiver). Each received bit signal from the analysis unit 10 of the pulse-width-modulated parcels is fed to the input of the recorder 12, the output signals of which (FIG. 2k) are fed to the input of the decoder 13 and to an external device. In the mode of reception by the device of the control command code, the playback control unit 11 generates the corresponding signals, which are fed to the recorder 12, and

inputs of the decoder 13, which decrypts the information received from the recorder 12. The output signals of the decoder 13 are received in the playback control box 11, which generates the corresponding signals for the external device (information receiver).

In practice, digital information on magnetic media is recorded in successive blocks with control

each block by obtaining a control polynomial of a certain size, which is formed at the end of the recorded block. Additionally, re-recording of digital information is used to protect against group failures.

A complete set of control commands that allows for the recording of information is given in the table.

Claims (2)

The proposed device allows us to forgive the analysis of the command control command, and to increase the information recording density. The invention The device for recording and reproducing digital information, containing serially connected - input drive, modulator, output unit and recording head, recording control unit connected to the input control input accumulator and through the pulse distributor - to the control inputs of the module as well as serially connected reproduction head, input block, pulse width modulated parcel analysis block and recorder, and playback control block, the first output of which is It is connected with a second recorder input, characterized in that, in order to simplify the analysis of control commands and increase the recording density, a block of commands is inserted into the device connected between the third output of the record control block and individual inputs of the modulator, a command attribute analysis block connected between the output the analysis unit of the pulse-width modulated parcels and the second and third inputs of the playback control unit, as well as the decoder, the first input of which is connected to the recorder output, and the second input and output are connected to The appropriate output and input reproduction control unit. Sources of information taken into account during the examination 1. Module of external memory cassette А311-4. Technological description 3.042.002 РЭ, p. 1, Severodonetsk, SRI UVM. 2. USSR author's certificate for application No. 2559777 / 18-10, cl. G 11 B 5/09, .28.12.77 (prototype). -w vyvV7y vy jyyTJ / v 3Khuft KOHOXiH ynfae / iffiHA / HT) 3 & nuet} nak ijH f atiauv4 lenect poppy, BfsS grab th f utr ofnoi dbiKoS ff / iata-11-II-- to u u marker Baiiod SiittKa ID. -irir Well W 05i / m IT 3 (Я7Д 1оха1) i54) hoi SaaKoTTT ui K nf o {HcmuA f (2 breaths  S / toKcTiJ h in (rorg111 LmunisT 0 imr in  IT Rig. 2