SU555426A1 - Method of magnetic recording information - Google Patents

Description

(54) METHOD OF MAGNETIC RECORDING OF INFORMATION

one

The invention relates to instrumentation, in particular to a method of magnetic information recording, which can be used in digital magnetic recording devices.

A known method of magnetic recording information on a moving magnetic medium, in particular, a magnetic tape used for reversing a pulse sequence (1) A reverse recording system is a type of digital magnetic recording and using it in a three-channel version with multi-frequency (including two-frequency) generating recorded or reproducible signals includes operations such as logging and decryption, detection, integration and differentiation of signals. Introducing the delay of signals in each channel separately leads to increased stability of the channels, but this greatly complicates the likelihood of receiving direct impulses, which reduces the reliability of the reproduced information.

The closest to the present invention is a method of magnetic information recording, based on the extension of the pulse duration of a code,

inverting them, delaying doubled sync pulses, generating a digital sequence of impulses from delayed sync pulses by combining them with extended and inverted code pulses, converting the received pulses into a double frequency sigal with a rectangular carrier frequency of direct and inverted polarity, where 1 (О) corresponds to the carrier frequency period, and the O (1) code, a half of the frequency data period, having a value, is two times lower than the carrier one 21. But when this method is implemented, there is enough more The largest phase shifts in the playback signals, where these shifts occur during the reproduction of digital information signals, are recorded in a two-frequency way.

The purpose of the invention is to reduce the phase shift in the playback signals that occur when playing digital information signals recorded in a frequency-dependent manner.

Claims (2)

Achieving this goal is achieved by forming two sequences of pulses by adding signals of double frequency with a rectangular carrier of direct inverted polarity with a digital sequence of pulses, obtained by adding delayed duplicated ohne impulses with expanded and inverted pulses of the O (1) code, "They receive the received pulse sequences, invert one jfe of them and feed both sequences to the magnetic golev of the recording, while the duration and amplitude of the pulse in regulate in accordance with the output signal of the head of the pyro. The difference between the device that allows the proposed method to be implemented is that this device, which contains a doubled clock pulse generator, is connected via a delay unit to one short circuit of the inhibitor circuit, and a pulse shaper of a formation code 1a, connected through another expander-inverter interdiction circuits, trigger and recording amplifiers, H8. The co-rims of different inputs of the magnetic head, supplied by an inverter connected between the output of the interdiction circuit and the trigger input, and two circuits, each of which is connected between a separate figgera swing and input of the respective recording amplifier, wherein the second inputs of AND circuits obeyus also connected to the output prohibition circuit. The drawing shows a block diagram of a device that implements the proposed method. Generator I doubled sync pulses through delay block 2 and shaper 3 information code pulses are connected via a game trigger 4 to various inputs of the inhibit circuit 5. Its output via inverter 6 and trigger 7 is connected to circuits And 8 and 9, which are amplifiers records, 10 and 11 are connected to different inputs of the head 12, which is a magnetic recording head. Signals arriving from generator 1 through delay unit 2, and from generator 3 through expander-1shertor 4 to prohibition scheme 5 in this scheme are summed up. At the same magnetic head signals are received in alternating sequence. Learning that zaggishi current pulses are introduced in areas corresponding to the leading edges of rectangular coding signal pulses of a unit and zero, the magnetic flux will have a phase shift with a lag of 90 ° relative to that stream, which will be formed when playing information; having a form in a dual-frequency recording system. The required phase shift of the magnetization when recording information by the described method is achieved by varying the length of the cycle of sync pulses coming from generator 1, i.e. doubled sync pulses, or, equivalently, double-frequency sync pulses, as well as by adjusting the amplitude of the recording current. The required limits for adjusting the duration of the pulses and the amplitude of the recording current are selected based on the signals determined by the operation of the playback head (not shown). The implementation of the invention will significantly increase the capacity of magnetic recording equipment when storing binary characters, which is equivalent to the use of additional equipment. Claim 1. Method of magnetic information recording, based on spreading the duration of impulses of a code, inverting them, delaying doubled clock pulses, generating a digital sequence of pulses from delayed clock pulses by combining them with expanded and inverted code pulses, generating the received pulses into a double-frequency signal with the rectangular carrier frequency of the direct and inzertia polar is polar, where code 1 (O) corresponds to the period of the carrier frequency and code O (1) is half the period and frequencies having a magnitude twice as low as the carrier, characterized in that, in order to reduce the phase shift in the reproduction signals occurring when playing the sipils of digital information 1, per liter, in a two-frequency way, forge two sequences of pulses by adding signals. double frequency with rectangular carrier}; direct and inverted polarity with a digital pulse sequence, obtained by deactivating a doubled clock pulse with extended and inverted code pulses, O (, 1), amplify the received pulse sequences, invert one of the 1хх and feed both sequences to the magnetic head recordings, while the duration and the arg / shlitdu of pulses are adjusted in accordance with the output signal of the reproduction head. 2. The device of claim 1, comprising a doubled clock generator, connected via a delay unit to one of the inputs of the inhibiting circuit, and a driver of information code pulses, connected via an inverter extender to another input of the inhibiting circuit, trigger and recording amplifiers loaded on Different inputs of the magnetic head, characterized in that it is spucked with an inverter connected between the output of the inhibitor circuit and the trigger input, and two AND schemes, each of which is connected between a separate trigger output and. the input of the corresponding recording amplifier, with the second inputs of both circuits And also connected to the output of the inhibit circuit. Sources of information taken into consideration during the examination: 1. US Patent No. 3304542, Cl. 340-172.5, 1967. 2. US patent number 3545003, cl. 346-74, 1970 (prototype).