JPS59129904A - Magnetic recording and reproducing system - Google Patents

Abstract

PURPOSE:To reduce an erroneous reading at the time of reproducing a recording information under different conditions by recording an amplitude reference signal in advance of a recording information group, and determining and reproducing the read gain of the information group by the amplitude reference signal by the same condition at the time of reproducing. CONSTITUTION:An amplitude reference signal 2 and an information group 3 are recorded under the same condition, and an amplitude reference signal 5 and an information group 4 are recorded under the condition which is different from said condition. In this case, the amplitude reference signal is recorded in advance of the information group. When reproducing, the reproducing read gain of the information group 3 is determined automatically by the signal 2, before the information group 3 is reproduced, and the information group 3 is reproduced by its determined read gain. In case of reproducing the information group 4, as for the read gain at the time when the information group 3 is reproduced, due to a fact that the signal 5 comes, the read gain is determined once again by the signal 5, and the information group 4 is reproduced by the determined read gain.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention records an amplitude reference signal on a magnetic recording medium,
The present invention relates to a magnetic recording and reproducing method that automatically determines the reading gain during reproduction based on this amplitude reference signal.

A conventional example of this type of system is shown in FIG. In the figure, (1) is a magnetic tape recording medium, (2)
is the amplitude reference signal recorded on the magnetic tape recording medium (1), and (3) is the information group subsequently recorded on the magnetic tape recording medium (1) under the same conditions as those under which the amplitude reference signal (2) was recorded. , (4) are recorded on the magnetic tape recording medium (
This is a group of information recorded in addition to 1). Figure 1(a)
The magnetic tape recording medium (1) shown in , (b) is the same, and FIG. (b) shows the state after information group (4) has been added and recorded.

Next, the operation will be explained. When reproducing information recorded on a magnetic tape recording medium, it is not always possible to reproduce it under the same conditions as Condition 1 under which the information was recorded.

Sometimes the playback is performed using a different device than the one used for recording, but in this case, due to the effects of wear on the magnetic head and differences in the contact strength between the magnetic tape recording medium and the magnetic head, the read output during playback may differ from the one used when it was recorded. It may vary. Also, it may be played back many hours after it was recorded.

At this time, due to chemical changes in the magnetic tape recording medium, the read output during reproduction may differ from that during recording. For this reason, when recording the information group (3) on the magnetic tape recording medium (1), the reading gain during reproduction of the information group (3) is the information group (1) recorded on the magnetic tape recording medium (1). If the determination can be made based on information recorded under the same conditions as 3), then information group (3) can be reproduced without being affected by chemical changes in the reproduction device or magnetic tape recording medium. , reading gain when reproducing information group (3)! An amplitude reference signal (2) is recorded for determination purposes. During reproduction, the reading gain is automatically adjusted based on the amplitude reference signal (2) so that the reading gain reaches the standard, and the information group (3) is reproduced with the reading gain that has reached the standard. Even when the information group (4) additionally recorded in FIG. 1(b) is recorded, the information group +
31, (When reproducing 41, the information group (31, +4
The reading gain during reproduction is determined based on the amplitude reference signal (2) recorded prior to the information group (31, (4i)), and the information group (31, (4i) is reproduced.

In the conventional method, even when reproducing a group of information added and recorded on the same recording medium under different conditions, the reading gain is determined by the previously recorded amplitude reference signal. There was a drawback that reading errors occurred in the information group recorded in addition to the above.

This invention was made to eliminate the drawbacks of the conventional methods as described above. When additional information groups are recorded on the same recording medium under different conditions, an amplitude reference signal is generated before the information group is recorded. The purpose of this is to reduce reading errors of information groups by determining the reading gain based on the amplitude reference signal recorded under the same conditions for information groups recorded under the same conditions during reproduction.

An embodiment of the present invention will be explained below with reference to the drawings. Figure 2 (a) is the same amplitude reference signal (2) as in Figure 1 (a).
and information group (3) are recorded on the magnetic tape recording medium, and (5) in FIG. 2(b) shows information group (4) added to the magnetic tape recording medium of FIG. 2(a). When recording, this is an amplitude reference signal recorded under the same conditions prior to information group (4).

The amplitude reference signal (2) and the information group (3) in Fig. 2(b) were recorded under the same conditions, and the amplitude reference signal (5) and the information group (3) were recorded under the same conditions.
4) was recorded under conditions different from those when the signal (2) and information group (3) were recorded. When recording the information group (4), if the amplitude reference signal (2) and the information group (3) are recorded using a different device, or if the information group (4) is recorded after a long period of time, the information group (4) The amplitude reference signal (
5) Record. The amplitude reference signals (2) and (5) may be of exactly the same format, but must be of a different format than the information group.

When reproducing the information in FIG. 2 (1)) recorded in this way, the amplitude reference signal (2
) The reproduction reading gain of the information group (3) is automatically determined, and the information group (3) is reproduced using the determined reading gain. When reproducing information group (4), information group (
The reading gain when reproducing 3) is determined by re-determining the reading gain using the amplitude reference signal (5) because the amplitude reference signal (5) has arrived, and then reproducing the information group (4) using the determined reading gain. It is something that is regenerated.

In addition, although the above example shows an example of recording and reproducing on a magnetic tape recording medium, if it is applied to a magnetic recording and reproducing method in which a group of information is added and recorded on a magnetic recording medium under different conditions, the same result as in the example can be obtained. The effects can be expected.

As described above, according to the present invention, information recorded under different conditions can be reproduced without being affected by the recording/reproducing apparatus, recording medium, etc.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the concept of a conventional magnetic tape recording medium, and FIG. 2 is a similar diagram showing an embodiment according to the present invention. (1)...Magnetic tape recording medium, (2+, (5)
1... Amplitude reference signal* (3', +41... Information group. In the two figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] An amplitude reference signal is recorded on a magnetic recording medium, and a read gain during playback is automatically determined based on the amplitude reference signal during playback, and recording is performed following the amplitude reference signal using the determined read gain. In a magnetic recording and reproducing method for reproducing a group of information, when a group of information is additionally recorded on the same recording medium under different conditions, an amplitude reference signal is recorded prior to recording the group of information to be recorded under the same conditions, A magnetic field characterized in that when reproducing recorded information, a group of information recorded under the same conditions is automatically determined a reading gain using an amplitude reference signal recorded prior to this group of information, and the group of information is reproduced. Recording and playback method.