JP2584055B2 - Video standard tape - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video standard standard tape for confirming and judging a reproduction output level of a rotary magnetic head in a video tape recorder.

2. Description of the Related Art Generally, in a rotating magnetic head type video tape recorder that reproduces a video signal by tracing a recording track having a predetermined inclination with respect to a running direction of a tape, each rotating magnetic head is recorded. If the tracking control adjustment that the position of the track is deviated deviates, the level of the reproduced signal does not show the maximum value and does not become the normal reproduction level because the azimuth of the adjacent track is different. Therefore, conventionally, for the determination of the reproduction level, the test signal recorded on the standard tape using the standard tape on which the test signal is recorded by a video tape recorder that accurately adjusts the tracking control adjustment of each rotary magnetic head. Is reproduced by a video tape recorder for confirmation, and the tracking control is adjusted so that the reproduction output becomes maximum to determine the reproduction level.

Hereinafter, an example of the conventional determination will be described with reference to the drawings. FIG. 9 shows a conventional recording pattern, and FIG. 10 shows a waveform obtained by monitoring the output of the rotating magnetic head with an oscilloscope. In FIG. 9, reference numerals 1 and 2 are reproduction heads. TW ₁ and TW2 are the track widths recorded by the test signal in the R head and the L head. + Theta ₁ shows the azimuth angle of the R head, - [theta] ₂ denotes the azimuth angle of the L head. FIG. 10 shows the reproduction signals output from the R head and the L head, which are level A and level B.

Hereinafter, the operation will be described. Standard tape TP ₂ of FIG. 9 and setting to be sure video tape recorder performs R head, L head recording tracks TW _1, TW ₂ in the trace to as tracking control adjustment In MAX, the level at which the reproduction output A and level B were visually confirmed and discriminated.

However, in the above-described configuration, it is necessary to adjust the tracking control of the video tape recorder to be confirmed while confirming the monitor waveform levels A and B visually or the like. The measurement value is extremely inaccurate, and a great deal of time is spent adjusting the MAX level when adjusting the measurement variation and tracking control. If the measurement is to be performed with a little accuracy, there is a problem that it is not possible to deal with automation by taking a long time and a sensory test to check the MAX of the level.

The present invention has been made in view of the above-described problems, and does not rely on a sensory test.
It is intended to provide a video standard regulation tape that can perform a tracking control-less operation by eliminating the X adjustment so that the reproduction level can be determined instantaneously.

Means for Solving the Problems In order to solve the above-mentioned problems, a video standard standard tape of the present invention has the same azimuth as a rotary magnetic head, and has a track continuously recorded in the longitudinal direction of the tape running. For each of the channels, recording is performed by dividing the magnetic tape vertically in the width direction so that the azimuth is different, a signal having a recording wavelength at which the reproduction frequency of the rotating magnetic head is in the same band as the video frequency is recorded, and the recording band is Deep recording is performed on the magnetic tape for each (recording wavelength), and tracks adjacent in the longitudinal direction of tape running are recorded with the same azimuth.

Effect of the Invention The present invention has the above-described configuration, and the level check of the rotating magnetic head of the video tape recorder to be checked can be instantaneously performed for each channel and each frequency by reproducing the video standard standard tape without adjusting the tracking control. It is extracted as an electric signal for each band, the signal can be stabilized by processing the electric signal, the measurement time can be shortened, and automation can be supported.

Embodiments Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment.

FIG. 1 is a schematic diagram showing a recording pattern of the embodiment.
FIG. 5 is a schematic view showing a tape cross section. FIG. 2, FIG. 3, and FIG. 4 are schematic diagrams showing recording patterns for each recording band (recording wavelength). FIG. 6 is a head output waveform diagram when the rotating magnetic head traces a wide area (upper layer). FIG. 7 is a head output waveform diagram when the rotating magnetic head traces the middle region (middle layer). FIG. 8 is a head output waveform diagram when the rotating magnetic head traces a low-frequency portion (lower layer portion). In FIG. 2, -α ₁ and + α ₁ are the azimuth angles of the rotating magnetic head, G ₁ is the recording wavelength, and H ₁ is the rotating magnetic head. T ₁ and T ₂ are the recording width of each channel.
In FIG. 6, reference numerals ₁ and ₂ denote reproduction output frequencies of the rotating magnetic head, and reproduction output frequencies 1 and 2 are the same frequency. In FIG. 7, reference numerals 3 and 4 denote reproduction output frequencies of the rotary magnetic head, and reproduction output frequencies 3 and 4 are the same frequency. In FIG. 8, reference numerals 5 and 6 indicate reproduction output frequencies of the rotating magnetic head, and reproduction output frequencies 5 and 6 are the same frequency. In addition, as apparent from FIGS. 6, 7 and 8, the reproduction output frequency is 1>3> 5. The values of the reproduction output frequencies 1, 3, and 5 are different in order to reproduce each recording band for each recording pattern.

The operation of the video standard standard tape configured as described above will be described below with reference to FIGS.

FIG. 1 shows a case where deep recording is performed for each band (each layer) shown in FIGS. 2, 3 and 4. As a recording procedure, first, a low frequency which can be deeply recorded on the magnetic tape is recorded. This is FIG. 4, in which recording is performed at an angle having a recording wavelength Gf ₃ , azimuth + α ₃ , −α _3, and a width of T ₁ , T ₂ above and below the tape TP ₁ for each channel in the tape running direction. Recorded continuously. FIG. 3 shows the recording wavelength G at the width of T ₁ and T ₂ with the azimuths of + α ₂ and −α _{2 having} different azimuths on FIG.
It is continuously recorded in the running direction at f _2. By repeating the above-described patterns shown in FIGS. 4 and 3 on the same tape, two-layer recording can be performed. FIG. 2 shows the recording of the high frequency band of the video band among the rotating magnetic heads. + Α ₁ , −α
_The frequencies having the recording wavelength of G1 with the azimuth of ₁ are T ₁ and T ₂
The width is continuously recorded in the running direction. The fourth above
By repeating the recording shown in FIG. 3, FIG. 3, and FIG. 2 on the same tape, three-layer deep recording can be performed.
Shown in the figure. FIG. 5 shows a cross section of the standard tape TP _{1 on} which recording is performed on three layers, and the recording depth TS ₁ ,
It has TS ₂ and TS ₃ , and TS ₁ , TS ₂ , and TS ₃ are defined so that a fixed rotary magnetic head reproduces output. Incidentally, the deep recording enables deep recording of several layers in accordance with the recording density of the standard tape TP _1.

If the standard signal recorded on the video standard tape TP ₁ above-mentioned recording pattern reproduced by the adjusted video tape recorder, a reproduction RF output signal, FIG. 6, 7
8 and FIG. 8 can be monitored by an oscilloscope or the like. FIG. 6 shows the reproduction level A of frequencies ₁ and ₂ ,
B indicates output only during the trace periods of T ₁ and T ₂ . Seventh
The figure shows the reproduction levels C and D of the frequencies ₃ and ₄ , and shows the outputs only during the trace periods of T ₁ and T ₂ . FIG. 8 shows the frequencies ₅ and ₆
And the output during only the trace period of T ₁ , T ₂ . As described above, the video standard tape TP ₁ shown in FIG.
The rotating magnetic head traces the frequency on the tape, so that it is possible to take out as a reproduction output from the rotating magnetic head a single tape at several frequencies. The reproduction levels A, B, C, D, E, and F are automatically detected and provided with a determination device, so that the reproduction output of the rotating magnetic head can always be determined at an optimum value (MAX value) without performing tracking control adjustment. . Here, when the standard signal recorded on the video standard tape TP1 is reproduced by the video tape recorder for adjustment, a tracking shift may occur in which the position between the rotating magnetic head and the recorded track is shifted, Tracks that are recorded adjacent to each other in the longitudinal direction of the tape are recorded with the same azimuth, so that the playback level does not change due to tracking deviation, and the playback output of the rotating magnetic head always obtains the optimum value. In this case, the reproduction output level of the rotating magnetic head can be determined without performing tracking control adjustment.

Advantageous Effects of the Invention As described above, according to the present invention, the reproduction output level of the rotating magnetic head for video can be determined without adjusting the tracking control, and the track width can be reduced by performing continuous recording in the tape running direction. Even with tape recorders that use different magnetic tapes, the envelope change is extremely small and the same check and discrimination can be performed, and the level of a rotating magnetic head with several azimuth angles can be discriminated with one type of tape, and a large check can be made. It is possible to obtain an excellent effect that the time required for the determination can be shortened, and that the sensory work can be eliminated and automation can be performed.

[Brief description of the drawings]

FIG. 1 is a pattern diagram of a video standard standard tape according to an embodiment of the present invention, FIG. 2 is a surface recording pattern diagram of a high frequency region of FIG. 1, and FIG. 3 is a shallow layer of a middle frequency region of FIG. FIG. 4 is a recording pattern diagram, FIG. 4 is a deep recording pattern diagram of the low-frequency portion of FIG. 1, FIG. 5 is a cross-sectional view of the standard setting tape TP1 of FIG. ₁ , and FIG. High frequency to be reproduced ₁ ,
_{2 is} a signal waveform diagram of FIG. 7, FIG. 7 is a signal waveform diagram of frequencies ₃ and _{4 in} the middle band, FIG. 8 is a signal waveform diagram of frequencies ₅ and _{6 in} the low band, and FIG. FIG. 10 is a signal waveform diagram reproduced from a conventional video standard tape. TP ₁ …… Magnetic tape.

Claims (1)

(57) [Claims] 1. A magnetic tape having the same azimuth as a rotary magnetic head, a track continuously recorded in the longitudinal direction of the tape running, and divided into upper and lower portions in the width direction of the magnetic tape so that the azimuth is different for each channel of the rotary magnetic head. Recording is performed, a signal having a recording wavelength at which the reproduction frequency of the rotary magnetic head is in the same band as the video frequency is recorded, and deep recording is performed on the magnetic tape for each recording band (recording wavelength). A video standard tape characterized in that tracks adjacent in the direction are recorded in the same azimuth.