SU491981A1 - Method of controlling the movement of magnetic media - Google Patents

Description

one

The invention relates to the field of instrumentation.

Methods are known for controlling the movement of magnetic media in magnetic recording apparatus operating mainly in the start-stop mode. When using a wide magnetic carrier for recording service information signals, for example, represented in digital form, it is necessary that all sections of the carrier move uniformly, otherwise the reliability of the recorded and reproduced information is reduced. In addition, when using the method of oblique line recording of useful information signals and in the absence of reliable control of the uniformity of motion of all sections of the carrier, it is not possible to achieve the required recording density.

The aim of the invention is to increase the recording density of useful information signals and the accuracy of their reproduction. This is achieved by using the proposed method, the control signals are recorded simultaneously on two longitudinal adjacent tracks of the carrier using different magnetic heads spaced in the direction of its movement, and during playback they compare the mutual delay time of the control signals from different tracks, determine the magnitude and sign longitudinal deformation of the carrier and, accordingly, change the speed of its movement.

FIG. 1 shows a magnetic carrier with recorded signals on it, and

FIG. 2 - diagrams explaining the processes occurring during the implementation of the described method.

On magnetic carrier 1, on the longitudinal tracks 2 and 3, pilot signals 4 are recorded. These signals are usually recorded by stationary magnetic heads 5 and 6, spaced in the direction of movement of the carrier. Signals of useful information 7 were recorded on the same carrier by the method of oblique-line recording.

FIG. 2 is designated: I and And - impulses of control signals; III - impulses generated when advancing or lagging

track 2 signals from track 3 signals; IV - the signal arising from the deformation of the carrier; V - start-stop movement of the carrier; VI is an exact match signal of the recording tracks.

During playback, each start-stop movement (plot V) of the carrier is carried out before reproduction of signal 7 and the movement is completed on the signal formed after reproducing

Claims (1)

control signal (plot I) from track 2, in the process of the same movement (plot V - first and third pulses) determine the sign of carrier deformation in accordance with the pulses shown in plot III, resulting from the lag of control signals on track 3 (plot 11) from the signals of track 2 (plot I). The results of carrier deformation are fixed (remembered), which is shown in Figure IV, and with their help, the carrier’s speed and direction are determined and determined on the plot VI with the size of the second pulse of plot V. Invention signals with the help of a stationary magnetic head and on the oblique-line recording of useful information signals with the help of rotating magnetic heads, characterized in that, in order to increase the density, and signals of useful information and accuracy of their reproduction, control signals are recorded simultaneously on two longitudinal adjacent tracks of the carrier using different magnetic heads arranged in the direction of its movement, and during reproduction the mutual delay times of control signals from different tracks are compared, the value and the sign of the longitudinal deformation of the carrier and, accordingly, change the speed of its movement. 2 5 in imm II -ipwrniplii ligi iiiii-ii || r