JPH08307901A - Video recording device - Google Patents

Abstract

PURPOSE: To record is three-dimensional video and a two-dimensional video by switching the azimuth angle of a recording track at every track and adjacently recording two three-dimensional video signals at a three-dimensional mode. CONSTITUTION: When a two-dimensional mode is selected, a recording mode setting means outputs a first signal and a first signal bestowal means alternately bestows two-dimensional video signals to the second heads B1 and B2 of first heads A1 and A2 at every field. Thus, the track where the two-dimensional video signals are continuously recorded is formed on a magnetic tape. The azimuth angle of the track is switched at every track. On the other hand, a second signal is outputted when the three-dimensional mode is selected, and an activation means and a second bestowal means operate. Thus, one three- dimensional video signal L, the other three-dimensional video signal R and an external input signal A are recorded in the magnetic tape in a circulating order, and the azimuth angle of the recording track is switched at every track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording device,
In particular, for example, for an 8 mm camcorder, two first and second heads having different azimuth angles, which are alternately arranged at intervals of 90 ° around the cylinder, rotate 270 ° in one field period. The present invention relates to a video recording device in which recording tracks are formed on a magnetic tape.

[0002]

2. Description of the Related Art An example of a conventional video recording apparatus of this type is
Japanese Patent Application Laid-Open No. 62-1 filed on July 22, 1987
No. 65488 [H04N 5/782, G11B
5/008, H04N 5/91, H04N 13/0
0]. In this conventional technique, two sets of magnetic heads are arranged on a rotating drum with a space of 180 ° between them.
The first video signal is recorded on the magnetic tape by the magnetic heads A and A'of the set and the second video signal is recorded on the magnetic tape by the magnetic heads B and B'of the other set at the same time. It is possible to record and reproduce a three-dimensional image by reading out the image signals of (3) almost at the same time.

[0003]

However, in such a conventional technique, the magnetic heads A and A'have the same azimuth (for example, 10 °) and the magnetic heads B and B'have the same azimuth (for example, -10 °). Then, it is not possible to record a two-dimensional image or reproduce a tape having a two-dimensional image recorded (a tape having an image recorded by a normal VTR). This is because, if magnetic heads A and A'are used for recording and reproduction, one of them will be in reverse azimuth with respect to the recording track. On the other hand, in order to enable recording and reproducing of a two-dimensional image, the azimuth angles of the magnetic heads A and A'are set to + 10 ° and -10 °, respectively, and the magnetic head B is set.
It is conceivable that the magnetic heads A and A ′ are used at the time of recording and reproducing a two-dimensional image with B and B ′ being the same azimuth θ. However, the magnetic heads B and B '
If the azimuth angle θ of is set in the range of 0 ° <θ <30 °, the relative azimuth angle with one adjacent track becomes smaller than the conventional 20 ° during the recording and reproducing of the three-dimensional image. The crosstalk interference from is large. In the range of θ> 10 °, cos (θ /
The reproduction output is reduced in proportion to 2), and the screen is easily cracked at the head switching point. From the above,
It has been virtually impossible to record and reproduce both 2D images and 3D images by the prior art.

Therefore, the main object of the present invention is to
An object of the present invention is to provide a video recording device capable of recording both a three-dimensional video and a three-dimensional video.

[0005]

According to a first aspect of the present invention, two first heads and two second heads having different azimuth angles, which are alternately arranged at intervals of 90 ° around the cylinder, have one field period. A video recording apparatus in which a recording track is formed on a magnetic tape by rotating 270 °, and a two-dimensional mode for recording a two-dimensional video signal or a three-dimensional mode for recording two three-dimensional video signals is provided. Recording mode setting means for outputting a first signal and a second signal according to each of the two-dimensional mode and the three-dimensional mode when selected, and operating according to the first signal to alternate the two-dimensional video signal for each field First signal applying means for applying to the first and second heads, and three heads of the first and second heads that are in contact with the magnetic tape at the same time, according to the second signal. And an activating means for activating the other three-dimensional video signal, which operates in response to the second signal and starts applying one of the three-dimensional video signals to one of the first and second heads, and the other one of the three-dimensional video signals after 1/3 field. Is a video recording device including second signal applying means for starting to apply to the other of the first and second heads.

According to a second aspect of the present invention, two first heads and two second heads, which are alternately arranged at intervals of 90 ° around the cylinder and have different azimuth angles, rotate 270 ° in one field period. Is a video recording apparatus in which tracks on which first and second video signals are alternately recorded are formed on a magnetic tape, and three heads of the first and second heads that are in contact with the magnetic tape at the same time are used. And an activating means for activating the second video signal of the first and second heads after 1/3 field from the start of applying the first video signal to either one of the first and second heads. The video recording apparatus is provided with a signal giving unit that starts giving to the other one.

[0007]

According to the first aspect of the invention, the recording mode setting means outputs the first signal when the two-dimensional mode is selected and outputs the second signal when the three-dimensional mode is set. When the first signal is output, the first signal providing means alternately outputs the two-dimensional video signal for each field to the first head (A1 and A).
2) and the second head (B1 and B2). Therefore, a track on which the two-dimensional video signal is continuously recorded is formed on the magnetic tape. Since the first heads (A1 and A2) and the second heads (B1 and B2) have different azimuth angles, the track azimuth angle is 1
It can be switched for each track. On the other hand, when the second signal is output, the activation means and the second signal applying means operate. As a result, when one of the three-dimensional video signals (L) is applied to, for example, one of the first heads (A1), it is 1 when the three-dimensional video signal (L) starts to be applied.
After / 3 field, the other three-dimensional video signal (R) starts to be applied to the other second head (B2), for example. Furthermore, for example, an external input signal (A) is generated 1/3 field after the other three-dimensional video signal (R) is applied.
Starts to be applied to the other first head (A2). One-third field after the external input signal (A) is started to be applied, one 3D video signal (L) is transferred to one second head (B).
1), the other three-dimensional video signal (R) begins to be applied to one of the first heads (A1), for example, 1/3 field after the start of application, and 1/3 of that.
After the field, for example, the external input signal (A) starts to be applied to the other second head (B2), for example. As a result, the one-dimensional video signal (L), the other three-dimensional video signal (R) and the external input signal (A) are recorded on the magnetic tape in a circulating order, and the azimuth angle of the recording track is one track. It can be switched every time.

In the second invention, the activating means and the signal giving means operate in the same manner as the activating means and the second signal giving means of the first invention, whereby the first video signal,
The second video signal and, for example, an external input signal are recorded on the magnetic tape in a circulating order, and the azimuth angle of the recording track is switched for each track.

[0009]

According to the first invention, the two-dimensional mode and the three-dimensional mode are used.
In any of the three-dimensional modes, the azimuth angle of the recording track is switched for each track, and in the three-dimensional mode, two three-dimensional image signals are recorded adjacent to each other, so that the three-dimensional image and the two-dimensional image are recorded. Both can be recorded.

In the second invention, the azimuth angle of the recording track is switched for each track, and the first and second video signals are recorded adjacent to each other, so that the three-dimensional video signal is properly recorded. You can The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an 8 mm camcorder 10 of this embodiment is a left eye image pickup device 12 and a right eye image pickup device 1.
The image radiated to the left-eye lens 16 including 4 is given to the imaging signal processing circuit 18, and the image radiated to the right-eye lens 20 is given to the imaging signal processing circuit 22. The imaging signal processing circuits 18 and 22 include a timing generation circuit 24.
The vertical synchronizing signal output from the above is given, and this is added to the video signal. There is a phase difference of 1/3 field between these two vertical synchronizing signals. The Y signal and the C signal output from the image pickup signal processing circuit 18 are respectively Y
The Y signal and the C signal which are given to the signal processing circuit 26 and the C signal processing circuit 28 and outputted from the imaging signal processing circuit 22 are given to the Y signal processing circuit 30 and the C signal processing circuit 32, respectively. However, the left-eye imaging device 12
The right-eye imaging device 14 operates as described above only when the operator selects the 3D mode, and when the operator selects the 2D mode, the recording mode setting circuit 25 turns off the imaging signal processing circuit 22. To be done.

The Y signal processing circuits 26 and 30 apply AGC (Automatic Gain Controll) to the input Y signal.
And apply emphasis. The Y signal processing circuit 26 further responds to the emphasized Y signal according to the control signal T _V output from the timing generation circuit 34.
Apply HHS (Half Horizontal Shift) processing. That is, a process of lowering the carrier frequency by 1/2 f _{H is applied} to the FM carrier of the signal output from the imaging signal processing circuit 22. On the other hand, C signal processing circuits 28 and 32
Is the ACC (Automatic Color) for the input C signal.
Controll), chroma emphasis, burst emphasis, and frequency conversion processing are performed. Further, the C signal processing circuit 28 responds to the control signal T _V from the timing generation circuit 34 to PI (Phase Inv.
ert) Apply processing. That is, the phase of the low frequency chroma signal is inverted every 1H period.

The Y signal and the C signal output from the Y signal processing circuit 26 and the C signal processing circuit 28 are mixed by the mixing circuit 3.
At 6, the audio signal output from the audio signal processing circuit 38 and the pilot signal output from the pilot signal generating circuit 40 are mixed. Further, the Y signal and the C signal output from the Y signal processing circuit 30 and the C signal processing circuit 32 are given to the mixing circuit 42 and mixed with the above-mentioned audio signal and pilot signal. Furthermore, in the mixing circuit 44,
The AUX signal output from the AUX signal processing circuit 41 is mixed with the audio signal and pilot signal. The pilot signal generating circuit 40 outputs _one of the four types of pilot signals f _{1 to} f ₄ according to the control signal T _P from the timing generating circuit 34. Further, the AUX signal includes a signal with a low frequency component such as a shooting condition (date, etc.) and a marker signal for identifying a recording track.
Each of the mixing circuits 36, 42 and 44 mixes the input signals and outputs a left-eye video signal L, a right-eye video signal R and an external input signal A, which are given to the switching circuit 46.
The switching circuit 46 sends an input signal to the head A1, according to the control signal T _S output from the timing generation circuit 34.
It is given to any one of B1, A2 and B2. Head A1
~ B2 is 90 around the cylinder 48 as shown in FIG.
The left-eye video signal L, the right-eye video signal R and the external input signal A are recorded on the magnetic tape 50. The magnetic tape 50 is 2 when in the 3D mode.
Drive at three times the speed of D mode.

Referring to FIG. 3, timing generation circuit 24
Includes a crystal oscillator 24a having an oscillation frequency of 1820 f _H (28.636 MHz), the oscillation frequency signal of which is divided by a frequency divider 24b by 910, and the frequency division signal of the frequency divider 24b is further divided by a frequency divider 24c.
Divided by five. As a result, from the frequency divider 24c to FIG.
The frequency-divided signal shown in (B) is output, and this is the frequency divider 24d.
To the AND circuit 24f after being inverted by the NOT circuit 24e. In the frequency divider 24d, the input frequency-divided signal is further frequency-divided by 3 and then frequency-divided in FIG.
The signal shown in (A) is applied to monomulti 24g and AND circuit 24f. Therefore, the monomulti 24g outputs a signal as shown in FIG. 4D as a vertical synchronizing signal for the left eye based on the input signal. On the other hand, AND circuit 2
4f AND-processes the input signal and outputs a signal as shown in FIG. Therefore, Mono Multi 24h is A
A signal as shown in FIG. 4E is output as a vertical sync signal for the right eye in accordance with the ND-processed signal. Therefore, as can be seen from FIGS. 4D and 4E, there is 1 / (1) between the vertical sync signal for the left eye and the vertical sync signal for the right eye.
A phase difference of three fields occurs, and the vertical sync signal for the right eye is output later than the vertical sync signal for the left eye.

The timing generating circuit 34 includes a cylinder 48.
RFSW based on the PG signal generated by the rotation of the
(A)) is given. The timing generation circuit 34 responds to this RFSW, as shown in FIG.
Define street timing. Then, according to the 2D / 3D signal from the recording mode setting circuit 25 and the specified timing, the control signals T _S , T _P and T _V are output as shown in Table 1.

[0016]

[Table 1]

That is, the recording mode setting circuits 25 to 3
When the D signal is given, the timing generation circuit 34
The switching circuit 46 is turned on according to the specified timing.
The control signal T _S is output so as to connect to the "-" state. Further, the pilot signal generation circuit 40 causes the pilot signals f ₁ to
The control signal T _P is output so as to switch f ₄ . Furthermore, the HHS processing and the PI processing are always applied to the Y signal processing circuit 26 and the C signal processing circuit 28.
The control signal T _V is output. On the other hand, the recording mode setting circuit 2
When the 5D to 2D signal is given, the timing generation circuit 34 switches the switching circuit 46 according to the specified timing.
The control signal T _S is output so as to switch between the states “I” to “ON” for each field. In addition, the pilot signal generation circuit 40 causes the pilot signal f
_The control signal T _P is output so as to switch _{1 to} f ₄ . Further, when the Y signal processing circuit 26 and the C signal processing circuit 28 are at the specified timings d to f and j to l, the HH
The control signal T _V is output so as to perform the S process and the PI process.

[0018]

[Table 2]

The switching circuit 46 has a connection state "a".
-"Wo" and "i"-"ni", as shown in Table 2, all of left side video signal L, right side video signal R and external input signal A or left side video signal L are fed to heads A1 to B2.
Give only. That is, in the 3D mode, the switching circuit 46 delays the 1-field left-eye video signal L, the right-eye video signal R, and the external input signal A by 1/3 field period, and the heads A1 to B2 move from B2 to A2.
→ Give in the order of B1 → A1. In the 2D mode, only the left video signal L is supplied to the head A1 for each field.
To B2 in the order of A1 → B1 → A2 → B2.

By thus switching the switching circuit 46, a recording track is formed as shown in FIG. 6 in the 2D mode. That is, since the left-eye video signal L is given to the heads A1 to B2 for each field, the azimuth angle of the recording track is switched alternately. Further, since the pilot signals f _{1 to} f ₄ output from the pilot signal generation circuit 40 are switched in the order of circulating in each field, the recorded pilot signals are also switched in the order of circulating in each track. Furthermore, since the HHS processing and the PI processing in the Y signal processing circuit 26 and the C signal processing circuit 28 are performed every other field, the magnetic tape 50 has P every other track.
The signal subjected to I processing and HHS processing is recorded.

In the 3D mode, the magnetic tape 50 runs at three times the speed of the 2D mode, and each head A
The 1-field period left-eye video signal L, right-eye video signal R, and external input signal A are applied while being shifted by 1/3 field period from 1 to B2, so that the magnetic tape 50 is displayed in the 2D mode as shown in FIG. A recording track having the same track width is formed, and the left-eye video signal L, the right-eye video signal R, and the external input signal A are recorded on the track in the circulating order. Further, since the heads A1 and B2 always record a signal while being in contact with the magnetic tape 50, the azimuth angle is switched for each track. Furthermore, since the Y signal processing circuit 26 and the C signal processing circuit 28 always perform HHS processing and PI processing, the phase of the chroma signal included in the left-eye video signal L is inverted every 1H, and the FM carrier frequency of the left-eye video signal is inverted. Is reduced by 1/2 f _H.

Furthermore, the pilot signal generation circuit 40
Pilot signals f ₁ ~f ₄ output from, because the switched every 1/3 field, the magnetic tape 50 is the pilot signal f ₁ ~f ₄ as shown in FIG. 8 is recorded. That is, three kinds of pilot signals are recorded on one track, and the pilot signals are recorded in the order of f _{1 to} f _{4 in} the longitudinal direction of the magnetic tape 50. In addition,
In this way, the pilot signals f ₁ to
The reason why f ₄ is switched is as follows.
That is, in the 3D mode, one of the heads A1 and B2 that is in contact with the magnetic tape 50 always records a signal. Therefore, if the pilot signal is output in the same manner as in the 2D mode, the magnetic tape 50 shown in FIG. The pilot signals f _{1 to} f ₄ are recorded as shown in FIG.
This is because Track Finding) processing cannot be performed.

According to this embodiment, only the left-eye video signal L is recorded in the 2D mode, and the left-eye video signal L and the right-eye video signal R are recorded adjacent to each other in the 3D mode. With this, both 2D and 3D images can be recorded. In addition to the 2D mode as well as the 3D mode, the azimuth angle of the recording track can be switched for each track.
Since the PI processing and the HHS processing are applied to the output signal from the left-eye imaging device 12 in the 3D mode for each field in the D mode, crosstalk during reproduction can be removed. Furthermore, 2D mode and 3D
Since the pilot signals f _{1 to} f ₄ are properly recorded in any of the modes, the ATF process can be performed during reproduction. Furthermore, in the 3D mode, since the timing generation circuit 24 outputs the vertical synchronization signals whose phases are shifted from each other by 1/3 field period, switching noise does not appear on the monitor screen during reproduction.

The magnetic tape 50 recorded in this way
When reproducing, the identification signal included in the external input signal A is searched, and if it can be detected, the 3D mode is set, the tape running speed is tripled in the 2D mode, and the magnetic tape 50 is reproduced.
Activate and track all heads that touch the
If the identification signal cannot be detected, normal operation may be performed in the 2D mode.

Although this embodiment has been described using the 8 mm camcorder, it goes without saying that the present invention can also be applied to a camcorder using a VHS-C cassette.
Further, the present invention can be applied to a stationary type 8 mm VTR and VHS-CVTR which take in the left-eye video signal and the right-eye video signal. Furthermore, it goes without saying that any image recording apparatus using a so-called small diameter cylinder in which four heads are arranged at intervals of 90 ° and a magnetic tape is wound around 270 ° can be applied. In this embodiment, the audio signal output from the audio signal processing circuit is mixed with the Y signal and the C signal. However, if the AUX signal includes the audio signal, the band of the Y signal can be expanded. Further, in this embodiment, the tape running speed in the 3D mode is set to be three times that in the 2D mode, but the tape running speed in the 3D mode is 2D as long as the head can read the signal.
There is no problem at the same speed as the mode.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an illustrative view showing a part of the embodiment in FIG.

FIG. 3 is a block diagram showing a part of the embodiment shown in FIG.

4A is a waveform diagram showing an output of a frequency divider 24d, FIG. 4B is a waveform diagram showing an output of a frequency divider 24c, FIG.
(C) is a waveform diagram showing the output of the AND circuit 24f,
(D) is a waveform diagram showing the output of the mono-multi 24g,
(E) is a waveform diagram showing the output of the mono-multi 24h.

FIG. 5A is a waveform diagram showing RFSW, and FIG.
[Fig. 3] is an illustrative view showing a prescribed timing.

FIG. 6 is an illustrative view showing a recording pattern in a 2D mode.

FIG. 7 is an illustrative view showing a recording pattern in a 3D mode.

FIG. 8 is an illustrative view showing a recording pattern in a 3D mode.

FIG. 9 is an illustrative view showing a recording pattern when a pilot signal is output in the 3D mode as in the 2D mode.

[Explanation of symbols]

 10 ... 8 mm camcorder 12 ... left-eye imaging device 14 ... right-eye imaging device 24, 34 ... timing generation circuit 25 ... recording mode setting circuit 26, 30 ... Y signal processing circuit 28, 32 ... C signal processing circuit 40 ... pilot signal Generating circuit 41 ... AUX signal processing circuit 46 ... Switching circuit 48 ... Cylinder 50 ... Magnetic tape

Claims (5)

[Claims] 1. A pair of first and second heads having different azimuth angles, which are alternately arranged at intervals of 90 ° around the cylinder, have a distance of 270 in one field period.
A video recording apparatus in which a recording track is formed on a magnetic tape by rotating, and a two-dimensional mode for recording a two-dimensional video signal and two three-dimensional modes are provided.
Recording mode setting means for outputting a first signal and a second signal according to each of the two-dimensional mode and the three-dimensional mode when any one of the three-dimensional modes for recording a three-dimensional video signal is selected, the first signal According to the above, the first signal applying means for alternately applying a two-dimensional video signal to each of the first and second heads for each field, the first and second heads being simultaneously applied to the magnetic tape. Activating means for activating three contacting heads in response to the second signal, and one of the three-dimensional video signals in one of the first and second heads by operating in response to the second signal. An image recording apparatus comprising: second signal applying means for starting application of the other of the three-dimensional image signals to the other of the first and second heads 1/3 field after the application is started. 2. A second vertical synchronizing signal in which a first vertical synchronizing signal is added to the one side of the three-dimensional video signal according to the second signal, and the phase is delayed by 1/3 field from the first vertical synchronizing signal. The video recording apparatus according to claim 1, further comprising: a synchronization adding unit that adds to the other of the three-dimensional video signals. 3. A third signal applying means for applying the first to fourth pilot signals to the first and second heads in the order of circulating the first to fourth pilot signals for each ⅓ field according to the second signal. The video recording device according to claim 1 or 2, further comprising: 4. A signal processing means for always performing at least one of a chroma signal phase shift process and a frequency shift process on only one of the two three-dimensional video signals according to the second signal. Item 4. The video recording device according to any one of Items 1 to 3. 5. Two first heads and two second heads, which have different azimuth angles and are alternately arranged at intervals of 90 ° around the cylinder, are 270 in one field period.
A video recording apparatus in which a track on which first and second video signals are alternately recorded is formed on a magnetic tape by rotating the magnetic tape, and the track is simultaneously recorded on the magnetic tape of the first and second heads. Activation means for activating the three heads in contact,
And applying a second video signal to the other of the first and second heads 1/3 field after starting to apply the first video signal to one of the first and second heads. A video recording apparatus, comprising a signal giving means for starting.