SU1465904A1 - Method of recording marker measurement signals - Google Patents

Abstract

This invention relates to a precision magnetic recording technique. A known method of recording a measuring signal is highly informative. A disadvantage of the known method is the difficulty of compensating for time shifts between individual channels caused by carrier skews. The aim of the invention is to improve the accuracy of multi-track recording by improving the temporal identification of channels. The goal is achieved by the fact that in each given interval the carrier is pressed in one of the levels of magnetization during the time (5-10) T (, and in the rest of the marker interval, including two initial and two end intervals, the carrier peremagnetiruyut at intervals with a combination durations equal to (0.6-1) T0 and 2To, where T is a carrier half-period. 3 ill. (L

Description

one

The invention relates to instrumentation, primarily to the technique of accurate magnetic recording using marker signals.

The aim of the invention is to increase the recording accuracy on a plurality of tracks of measurement signals by improving their time identification.

Sequential recording of analog information in the form of carrier-amplitude or frequency modulated and digital marker signals that can be easily detected with time selection of intervals exceeding 5To duration allows unambiguously determining the beginning and end of each recording frame and compensating for the time shifts of the reproduced measurement signals.

Figure 1 presents the scheme of the device, the device realizing the described method; 2 and 3 are timing charts of its operation.

Input information bus 1 is connected via an analog-to-digital converter 2, two blocks of memory 3 and 4 (type 1002IR1), a digital-to-analog converter (DAC) 5 (for example, type 1108PA1), converter 6 voltage-frequency (for example, type 1108П1) , multiplexer 7 (for example, type 561 KPI) with a recording unit 8 containing an amplifier and a recording head. The generator 9 is connected via a counter 10, a ROM (persistent storage device) 11 (for example, type 556РТ6) to the control inputs of the memory unit 3 and multiplexer 7.

four

ABOUT)

sd

with

(fiu.1

d

7

ZU1

at

ZU1

At

(ftue.Z

/

DU1

-3

-3

ZU2

t

The device works as follows

 The input measurement signal (Fig. 2a) in the form of a parallel code corresponding to piecewise implementations ti m at intervals T, is alternately recorded in blocks 3 and 4 according to the recording sequence diagram (Fig. 26). Due to the accelerated reading of information alternately from the first and second memories (Fig. 2b), transforming it with the aid of the digital signature module 5 and the converter 6, the parallel code is converted into a frequency-modulated carrier signal. At the time of the arrival of the marker signal forming the ROM 11, the multiplexer connects the input bus of the recording unit to the ROM bus

15

service information there are no shelves as a result of recording intervals.

In order to avoid floating the base line, facilitate the formation and increase the reliability of demodulation, the upper limit of the marker interval should be limited to the value of the UTo order. As a result, the marker signal is sufficiently narrow-band and not extending beyond the bandwidth of the magnetic recording path.

Claims (1)

Invention Formula A method of recording marker measurement signals, comprising Control the operation of the entire device-2o separation of analog signals on This is done as the program embedded in the ROM 11 is read, including the marker word, the approximate structure of which is shown in FIG. 2d. The maximum heating between the two transitions of the frequency-modulated carrier with a 40% deviation will be 1.4 TO, and at the junction of information Ilmarker signals in the worst case - 1.4T + 2T (, 3.4 TO. This interval is always less than the marker one, which exceeds ST, which determines the condition of reliable demodulation of the marker. The service information is recorded by manipulating the intervals T and 2T. The lower limit of T, equal to 0, BTD, is determined by the maximum allowable decay of the planar characteristic, equal to 70-80% when writing frequency f --I--. The upper limit is limited by the value of Tjj, at which the reproduced two-frequency signal; 25 thirty 35 40 45 discrete implementations, reducing their time scale, recording onto the appropriate magnetic track when modulating the carrier of neighboring realizations for each signal with a given time interval between Them, as well as the same signals at the beginning and end of these realizations, in order to improve the accuracy recording the set of measurement signal tracks by improving their time identification, in each interval the carrier is introduced into saturation by one of the magnetization levels in the time interval (5-10) T a the remainder of the site with two initial and final intervals, the carrier is re-magnetized with a combination of the durations of these intervals (0.6–1.0) TO and 2 (0.6–1.0) TO, while the remagnetization with large intervals is formed directly but after the time interval (5-10) TO, where TO is the value of the half-period of the modulated carrier. service information there are no shelves as a result of recording intervals. In order to avoid floating the baseline, facilitate the formation and increase the reliability of demodulation, the upper limit of the marker interval must be limited to the value of the order of YuTo. As a result, the marker signal is sufficiently narrowband and not extending beyond the passband of the magnetic recording path. Invention Formula A method of recording marker measurement signals, comprising discrete implementations, reducing their time scale, recording onto the appropriate magnetic track when modulating the carrier of neighboring realizations for each signal with a given time interval between them, as well as identical signals at the beginning and end of these realizations, characterized in that, in order to improve the recording accuracy on multiple tracks of measuring signals by improving their time identification, in each interval the carrier is saturated by one of the magnetization levels in the time interval (5-10) T, and on the rest of the site with two initial and final intervals, the carrier is re-magnetized with a combination of the durations of these intervals (0.6–1.0) TO and 2 (0.6–1.0) TO, while the remagnetization with large intervals is formed directly to and after the time interval (5-10) TO, where TO is the half-period value of the modulated carrier. ig.Z