JPS6233306A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain high performance of picture quality while keeping compatibility with a general home use VTR by providing the 2nd recording and reproducing means recording or reproducing a divided signal by the 2nd head group and a changeover means changing over the 1st and 2nd recording and reproducing means. CONSTITUTION:In order to provide magnetic head 6, 19 closely together, a magnetic tape 21 forms a specific recording pattern. Tracks [HA1], [HB1] are recorded by magnetic heads HA1, HA2 (6) and tracks [HA2], [HB2] are recorded by magnetic heads HA2, HB2 (19). The difference between a recording pattern of a general home use VTR and that of a high picture quality VTR resides in it that the interval of control pulses recorded at every rotation of a rotary drum 22 is nearly doubled. This is attained by switching the feeding speed Vt of the magnetic tape 21 nearly twice in case of the high picture quality VTR is comparison with a general home use VTR in interlocking with the change over of switch circuits 15, 16. Thus, the performance with high picture quality meeting the professional applications is obtained while keeping the compatibility with that for a general home use VTR.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a video signal for recording and reproducing color video signals.

This invention relates to a number recording and reproducing device (hereinafter referred to as a VTR).

2. Description of the Related Art VH8 system VTRs and Beta system VTRs are widely used as VTRs for recording and reproducing color video signals for general home use.

Recently, the industry has standardized on 8mm video, which uses compact cassettes and is compact and lightweight.
A two-head helical power scan system is employed in which the f1f decoding signal is FM modulated and the color signal is converted to a lower frequency. [For example, Katsuya Yokoyama et al., "Introduction to Home VTFt" Corona Publishing] OL, Kaji, and the above three methods have differences in the cassette shape and the recording pattern recorded on the magnetic tape.
There is an inconvenience that the soft tapes are not compatible with each other.

In addition, the above-mentioned VH3, which has been developed and mass-produced for home use in recent years,
The M-format (M-format) VTR utilizes the cassette mechanism of the VTR and Beta VTRs for professional use and boasts high image quality and high performance.

Betacam VTRs have been developed and are on the market.

(For example, Noya et al., "Camera-integrated VTRICNG system," Television Television Society Journal Vol. 36 No. Naturally, there is no compatibility due to the difference in patterns.Furthermore, home VTRs whose cassette shape and mechanism are basically the same
This has the disadvantage that it is economically very wasteful for the users, since both parties cannot use the equipment.

On the other hand, in recent years, high-performance receivers compatible with new media have been developed, and the demand for higher image quality even for general home VTRs is becoming higher and higher.

In view of these points, the present invention provides a novel video signal recording and reproducing device that is compatible with general household VTRs and can provide even higher image quality.

Means for Solving the Problems In order to solve the above problems, the present invention provides a rotating drum with a first
A plurality of magnetic heads each consisting of a head group and a second head group are provided, a first recording/reproducing means records or reproduces a color video signal with the first head group, and the color video signal is divided into two signals. a second recording and reproducing means for recording or reproducing the divided signal with a second head group; and a switching means for switching between the first and second recording and reproducing means. It is a device.

Operation The present invention has the above-described configuration, and is capable of recording and reproducing compatible with VTRs already developed for general household use.
The apparatus is effectively utilized by recording and reproducing high-performance images using a second head group, and by making it possible to switch between the first recording and reproducing means and the second recording and reproducing means. Therefore, it is possible to provide products with high added value to users.

Embodiment FIG. 1 shows a block diagram of a recording section of a video signal recording and reproducing apparatus in an embodiment of the present invention. In Figure 1, 1 is an input terminal for color video signals, 2 is an input terminal 1
3 is an FM modulation circuit; 4 is a high-pass filter that removes low-frequency components of the output signal of the FM modulation circuit 3;
6 is a recording amplifier circuit, 6 is a magnetic head, 7 and 11 are bandpass filters that separate the carrier color signal component from the color video signal, and 8
is a frequency conversion circuit, 9 is a low-pass filter, 1'''0 is an addition circuit, 12 is a (R-Y) signal from the carrier color signal, (B-Y
13 is an FM modulation circuit, 14 is a recording amplifier circuit, 15.1
6 is a switch circuit, 17 is a switch circuit 16 and 16
18 is a reference signal input terminal, and 19 is a magnetic head. 2A, 2B and 2C show the arrangement of the magnetic head 6, 190 and the magnetic tape pattern for explaining the configuration of a block diagram of the recording section which is one embodiment shown in FIG.

The configuration and operation of an embodiment of the present invention will be explained using FIGS. 1 and 2. When recording with the same recording pattern as for normal home use, the switch circuits 15 and 1e are set to the b side by the control signal from the control signal input terminal 17, and the magnetic head 19 receives the signal from the recording amplifier circuit 14. Since the magnetic head 19 is not supplied with the magnetic head 19, its function is stopped.

Therefore, the color video signal input to input terminal 1 is
The signal is separated into a luminance signal component and a carrier color signal component by a low-pass filter 2 and a bandpass filter 7, and the luminance signal component is inputted to an adder circuit 1o via an FM modulation circuit 3 and a high-pass filter 4. On the other hand, the carrier color signal component is frequency-converted by a frequency conversion circuit 8 using a reference signal supplied from a terminal 18, and a low-pass color signal is obtained by a low-pass filter 9. This low-frequency color signal is added to the low-frequency side of the FM-modulated luminance signal by an adder circuit 1.
o, and is supplied to the magnetic head e via the b side of the switch circuit 15 and the recording amplifier circuit 5. Here, the arrangement of the magnetic heads 6 and 19 is shown in FIG. 2aK. Rotating drum 22 (rotation speed is 18oO rotations per minute)
A1, HA of magnetic head 19, and H of magnetic head 6
Bl and HB2 of the magnetic head 19 are provided close to each other, and HA.

and HB, and HA2 and HB2 are arranged at 180 degrees from each other. In addition, 21 is a rotating drum 22
23 is a control head.

As explained above, a signal obtained by superimposing the FM-modulated luminance signal and the color signal converted to a low frequency is supplied to the magnetic head 6 via the recording amplifier circuit 6, but the HA of the magnetic head e is , and HB, a recording pattern as shown in FIG. 2 is formed on the magnetic tape 21. In the recording pattern shown in FIG.
A is the trajectory recorded by A, [HB, ] is the trajectory recorded by HBl of the magnetic head 6, and 24 is a control track that is recorded every rotation of the rotating drum 22 (
tl-33msec) A control pulse is recorded by the control head 23. Now, the recording pattern shown in Figure 2 is widely used for general household use, for example, V
In order to have the same recording pattern as the H3 method'/TFt, the diameter of the rotating drum 22 is φ=62 mm, and the magnetic tape 21 is
When the feed speed Vt is set to 33.3511/SθC, the track pitch 'rp-68 μm is obtained.

Next, a recording and reproducing method will be described when aiming at high image quality and high performance on the level of a commercial VTR. In this case, the switch circuits 15 and 16 are each placed on the a side by the control signal at the control signal input terminal 17 in FIG. The color video signal input to the input terminal 1 is separated into a luminance signal component and a carrier color signal component by a low-pass filter 2 and a bandpass filter 11, and the luminance signal component is frequency-modulated by an FM modulation circuit 3 and sent to a switch circuit 15. On the a side, the carrier color signal component is supplied to the magnetic head θ via the recording amplifier circuit 5. On the other hand, the carrier color signal component separated by the bandpass filter 11 is processed by the color signal processing circuit 12 into a (RY) signal, (B - Y) signal is converted into a baseband signal, and the time axis is compressed to a certain extent, so that two signals (R-Y) signal and (B-Y) signal are transmitted within one horizontal scanning period. (Time C
compression) signal.

The TO multiplied signal processed by the color signal processing circuit 12 is supplied to the FM modulation circuit 13, frequency modulated, and supplied to the magnetic head 19 via the recording amplifier circuit 14 and the a side of the switch circuit 1θ.

Since the magnetic heads 6 and 19 are provided close to each other as explained in FIG.
A recording pattern as shown in Figure C is formed. In FIG. 2C, [HA, ], 1:HB,] are the trajectories recorded by HA, , I(B,) of the magnetic head 6, respectively, and [H person z), (HB2I] are the trajectories recorded by the magnetic head 6, respectively. head 1
9 HA2. This is the trajectory recorded with HB2. Also, 24 is a control track, which is one of the rotating drums 22.
At every revolution (t, ? 33 m5ec) a control pulse is recorded by 7 do 23 to the control.

Here, the difference between the recording pattern in the case of a general household VTR shown in FIG. 2S and the recording pattern in the case of high image quality shown in FIG.
The interval between control pulses recorded at a===33 msec) is approximately doubled. this is,
If the image quality of the magnetic tape 21 is to be higher than that of a general home VTR, this can be achieved by switching the feed speed VT of the magnetic tape 21 in conjunction with the switching of the switch circuits 16 and 1e so that the image quality is approximately twice as high as that of a general home VTR.

The above-described method of handling the color signal component of the color video signal as a baseband signal and recording the luminance signal component and color signal component on separate tracks is similar to the method used in general home VTRs. It is clear that a reproduced image of much higher quality and higher performance can be obtained.

As described above, according to the embodiment of the present invention shown in FIGS. 1 and 2, the magnetic heads 6 of HA, , HB1 and
A first means for recording and reproducing a color video signal with the magnetic head 6 using a color signal low frequency conversion recording method adopted in a general household VTR, in which B2 magnetic heads 19 are provided adjacent to each other; a second means for dividing the signal into two signals, a luminance signal and a chrominance signal, and recording and reproducing the luminance signal using the magnetic head 6 and the chrominance signal using the magnetic head 19; By having a means for switching between the two, it becomes possible to create a recording and reproducing device that is compatible with general home VTRs, such as VH8 system VTRs, and which can obtain reproduced images with high image quality and high performance at the level of commercial VTRs. .

In addition, in the embodiment, a method for recording and reproducing a standard color video signal such as the NTSC method has been described, but in recent years, color video signal transmission methods with a wider band than the standard color video signal have been introduced, such as the MUSE method (high-definition television). A method that compresses the signal band and transmits it, and the band is approximately sMH.
A MAC method (a method in which luminance signals and color signals are compressed in the time axis and transmitted, and the band is about 6 to sMHz) has been proposed. Therefore, by dividing the broadband color video signal into two signals by means such as time division or frequency division, and recording and reproducing each signal on separate tracks, a general home VTR that records and reproduces standard color video signals can be used. It is also possible to realize a device that is highly compatible and can also record and play back broadband color video signals.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the rotating drum is provided with a plurality of magnetic heads, and the first recording/reproducing means records or reproduces a color video signal using the first group of heads; means for dividing a video signal or a wider band color video signal into two signals; a second recording/reproducing means for recording or reproducing the two signals with a second head group;
By realizing a video signal recording and reproducing device equipped with a switching means for switching between the first and second recording and reproducing means, it is possible to obtain high image quality performance at a professional level while being compatible with general home VTRs. Since it is possible to provide a recording and reproducing device that can be used at a relatively low cost, its practical effects are extremely significant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a recording section of a video signal recording and reproducing apparatus showing an embodiment of the present invention, FIG. 2 a is a layout diagram of a magnetic head, and FIGS. It is a pattern diagram. 6.19...Magnetic head, 15,1θ...
...Switch circuit, 21...Magnetic tape, 22
...Rotating drum.

Claims (5)

[Claims] (1) In cold rolling of a titanium plate, an organic polymer compound film is formed on the surface of the titanium plate in advance, and then rolling oil,
A method for cold rolling a titanium plate, characterized in that rolling is carried out in the presence of a water-soluble rolling fluid or water. (2) The basis weight of the organic polymer compound film is 0.1 to 10 g
/m^2. The cold rolling method according to claim 1. (3) The cold rolling method according to claims 1 and 2, wherein the organic polymer compound is water-soluble. (4) The cold rolling method according to claims 1 and 2, wherein the organic polymer compound is solvent-soluble. (5) The molecular weight of the organic polymer compound is 1,000 to 1,0
A cold rolling method according to claims 1 to 4 in the range of 00,000.