JPH02223048A - Adjusting method for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make the error of a standard tape regardless and to use the tape even in the magnetic recording and reproducing device of a narrow track by calculating difference between an error, which is generated when a standard recording medium is reproduced by the magnetic recording and reproducing device, and an error from a reference format stored in a storing means which is attached to the standard recording medium. CONSTITUTION:The error from the reference format of the standard recording medium, which goes to be a mechanical compatibility reference, is stored by a storing means 17 and the error between the magnetic recording and reproducing device and standard recording medium is detected by an error detecting means 16. The difference between the error, which is stored in the storing means 17, and the error, which is detected by the error detecting means 16, from the reference format of the magnetic recording and reproducing device, is calculated by an arithmetic means 20 and the error from the standard format of the magnetic recording and reproducing device is corrected. Thus, regardless of the error in the standard tape, adjustment can be executed with more satisfactory accuracy. Then, the tape can be used even in the magnetic recording and reproducing device of the narrow track.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of adjusting a magnetic recording/reproducing device for mechanically adjusting the compatibility of a helical scanning type magnetic recording/reproducing device used in a VTR or the like.

BACKGROUND OF THE INVENTION Conventionally, the following adjustment method has been used for this type of magnetic recording/reproducing apparatus.

FIG. 6 shows a method of adjusting this conventional magnetic recording/reproducing apparatus. 31 is the screen of the oscilloscope, and 32 is the magnetic recording medium (hereinafter referred to as standard tape) during playback.
This is a playback output envelope of a video head of a recording/playback device.

Conventionally, in order to guarantee the mechanical compatibility of magnetic recording and reproducing devices, a standard tape (not shown) within a certain error range is used, and the envelope 32 of the magnetic recording and reproducing device is used for reproduction. We have adjusted the mechanical compatibility of time. In other words, it is extremely difficult to produce such standard tapes in exactly the same standard format without mechanical errors. Normally, it is managed so that

In addition, at the manufacturing site, when adjusting a magnetic recording/reproducing device, a machine is used so that the envelope 32 on the oscilloscope screen 31 has a predetermined shape so that the deviation from the standard tape of the magnetic recording/reproducing device is within the error specified in the adjustment specifications. This is done by standard adjustment means (omitted here).

In other words, if this standard tape is used to adjust the mechanical compatibility of the magnetic recording and reproducing device, the error E of the magnetic recording and reproducing device will be reduced.
d is expressed as follows: Ed=Em+Ec, where: Em: Deviation from the standard format of the standard tape Ec:
This is an adjustment error of the magnetic recording/reproducing device.

Problem to be Solved by the Invention However, in the conventional configuration described above, when adjusting the mechanical compatibility of the magnetic recording and reproducing device, the error in the mechanical compatibility of the magnetic recording and reproducing device after adjustment is the adjustment error and the standard tape. In so-called narrow-track magnetic recording and reproducing devices, where the recording track is narrow, the error of the standard tape becomes a non-negligible value, making it difficult to guarantee compatibility between magnetic tapes recorded with different magnetic recording and reproducing devices. It had

The present invention solves the above-mentioned conventional problems, and makes the errors of the standard tape irrelevant when performing mechanical compatibility adjustment of magnetic recording and reproducing devices using standard tapes, and can also be used in magnetic recording and reproducing devices with narrow tracks. An object of the present invention is to provide a method for adjusting a magnetic recording/reproducing device.

Means for Solving the Problem In order to achieve this object, the adjustment method for a magnetic recording/reproducing device of the present invention stores the error from the standard format of a standard recording medium, which is a mechanical compatibility standard, in a storage means, and An error between the recording and reproducing device and the standard recording medium is detected by an error detection means, and a difference between the error stored in the storage means and the error of the magnetic recording and reproducing device from the standard recording medium detected by the error detection means. is calculated by a calculation means, and the error from the standard format of the magnetic recording/reproducing device is corrected.

Operation The present invention uses the method described above to calculate the difference between the error when a standard recording medium is reproduced by a magnetic recording and reproducing device and the error from the standard format stored in the storage means added to the standard recording medium, using a calculation means. By doing so, the absolute value of the deviation from the mechanically compatible basic format of the magnetic recording/reproducing device is obtained.

Example Embodiments of the present invention will be described based on the drawings.

FIG. 2 shows a standard recording medium (
This is an example of a mechanical compatibility error curve of a standard tape stored on a standard tape (hereinafter referred to as a standard tape).

In the figure, 1 is a thin transparent film, and 2 is an error curve.

This error curve 2 is usually obtained by measuring the mechanical height using a magnetic recording pattern measurement method using a microscope.The deviation between the measured value and the standard format is calculated and adjusted to the time axis when the head scans the recording track. It was drawn on film.

FIG. 3 is an example of an error between the magnetic recording and reproducing apparatus and the standard tape, which is displayed on an oscilloscope and obtained by an error detection circuit to be described later. In the figure, 3 is the oscilloscope screen, and 4 is the error detection output of the error detection circuit.

In this embodiment, the error can be drawn as a curve based on the output of the error detection circuit and displayed on the oscilloscope, but the error is calculated by taking the envelope of the playback output envelope of the video head. Alternatively, it can be detected by the azimuth time difference between channels in a two-channel two-track azimuth recording method. FIG. 4 shows an example of a mechanically compatible error detection circuit based on the azimuth time difference. The time difference detection circuit processes the signals from the two heads 5 and 6 in the figure in the video signal processing circuit 7 and detects the time difference between the horizontal synchronization signals (hereinafter abbreviated as Hsync) (A) and (B) included in the video signal. 8 and D/A converted by the D/A converter 8, which is input to the oscilloscope screen 3 in FIG.

FIG. 1 shows the process of calculating the error between the error curve 2 of the standard tape and the error detection output 4 of the error detection circuit of the magnetic recording/reproducing apparatus. In the figure, 10 is a composite screen of the film 1 and the oscilloscope screen 3) 11 is the zero point movement error detection output of the error detection output 4, and 12 is the difference between the zero point movement error detection output 6 and the error curve 2.

In Figure 1, film 1 is displayed on oscilloscope screen 3.
By overlapping them, a composite screen 5 is created.

At this time, it is necessary to match the scales of the film 1 and the oscilloscope screen 3. Simply combining them will result in composite screen 5.
Since the difference between the upper error curve 2 and the error detection output 4 cannot be detected, in this embodiment, the error detection output 4 is adjusted with the zero position adjustment volume of the oscilloscope, and the right part is combined with the error curve 2 and the superposition error curve 2. This is to find the difference 12 between

This difference 12 is the absolute difference in mechanical compatibility between the standard format and the magnetic recording/reproducing device.

FIG. 5 is a block diagram showing the configuration of an adjustment device that embodies the adjustment method in the second embodiment of the present invention.

In Fig. 5, HsynC is extracted from the signals from the two heads 13 and 14 via the video signal processing circuit 15, and the mechanical compatibility deviation is extracted by the azimuth time difference using the time difference detection circuit 16. . However, a ROM 17 corresponding to a storage means for storing deviations from the standard format is added to the marker tape, and in this embodiment, mechanical compatibility errors from the standard format are recorded for each HsYnc corresponding to the time axis. is memorized. The ROM 17 may be provided in the tape cartridge so that the standard tape and its error correspond one-to-one, or the ROM 17 may be configured such that the error measured in advance is stored in the RO.
The ROM 17 may be incorporated into the adjustment device via a connector or the like.

On the other hand, there is a counter 18 that is reset by the head switching pulse (H-8W) and counts the number of H8YnC taken out from the video signal processing circuit 15, and the output of the counter 18 (number of HsynC) is input to the ROM 17. The mechanical compatibility difference at the position corresponding to the output of the counter 18 (the number of Hsync) is read out, the D/A converter 19 converts the mechanical compatibility difference, and the differential amplifier 2o, which corresponds to the calculation means, converts the D/A converter. The difference in mechanical compatibility with the standard tape of the magnetic recording/reproducing device is taken out from the time difference detection circuit 16 via 21. This difference results in an absolute mechanical compatibility deviation with respect to the standard format of this magnetic recording/reproducing device.

It should be noted that the deviation of the standard tape from the standard format has a value unique to each standard tape, and in the first and second embodiments of the present invention, each standard tape has a pair of films or ROMs as storage means. It goes without saying that the first correspondence is assigned by a number or the like.

In the second embodiment of the present invention, the mechanical compatibility deviation of the ROM is stored every HsYnc, but it may be stored every several Hsyncs. In addition, although each digital signal was converted to analog and an analog difference method was used as the calculation means, each digital signal was directly handled and calculated, the difference was taken, and the digital signal after the calculation was converted to D/A.
Needless to say, it is also possible to convert it and take it out as an analog output.

As described in detail, according to the method for adjusting a magnetic recording/reproducing apparatus of the present invention, deviations in mechanical compatibility from a reference format are stored in a storage means on a standard tape that guarantees mechanical compatibility of the magnetic recording/reproducing apparatus. However, by taking the difference in mechanical compatibility deviation from the standard tape of the magnetic recording and reproducing device, the absolute error from the standard format of the magnetic recording and reproducing device can be determined, and regardless of the error of the standard tape, This allows highly accurate adjustment and will have a great practical effect as tracks become narrower in the future.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of calculating the error between the error curve of a standard tape and the error detection output of the error detection means of the magnetic recording and reproducing device, showing the adjustment method of the magnetic recording and reproducing device in the first embodiment of the present invention. Figure 2 is a front view showing an example of the mechanically compatible error curve of the standard tape stored in the error storage means of the same standard tape, and Figure 3 is a magnetic recording and reproduction obtained by the error detection means displayed on the oscilloscope. FIG. 3 is an envelope diagram on a cope with a standard tape of the device. 1...Film, 2...Error 1! , 3...
Oscilloscope screen, 4...Error detection output,
10... Composite screen, 11... Zero point movement error detection output, 12... Difference, 8... Envelope.

Claims (1)

[Claims] Added to a magnetic recording/reproducing device and a standard recording medium serving as a mechanical compatibility standard from a standard format of a recording medium of the magnetic recording/reproducing device, and storing an error of the standard recording medium from the standard format in a storage means. an error between the standard recording medium and the magnetic recording/reproducing device is detected by an error detection means, a difference calculation means calculates the difference between the error stored in the storage means and the error detected by the error detection means; A method for adjusting a magnetic recording/reproducing device, comprising correcting an error from a standard format of the magnetic recording/reproducing device.