JPH05298602A - Reproducing device and reproducing and recording device - Google Patents

Abstract

PURPOSE:To shorten the dubbing time through easy operation by providing more magnetic heads than those for recording and making a magnetic tape travel at a lead angle different from that for recording faster than in recording. CONSTITUTION:On a tape guide drum 9 used for reproduction, six heads 11a-11f are provided on the same plane at 60 deg. intervals. The diameter D2 of the drum 9 is set to about 3/5 as long as the diameter of a drum for two normal heads and 24 mm at the time of the format of an 8mm VTR. The tape 1 is wound around the drum 9 and reproduced by traveling five times as fast as in recording. The tape 1 is wound around the periphery of the drum 9 to 310 deg. and its signal is reproduced for 300 deg. which is 5/3 times as large as a 180 deg. normal winding angle. Further, the tape is wound around the drum 9 slantingly at a relative angle a 2 as shown in a figure and the angle is the lead angle for a travel guide. A normal lead angle, however, is alpha1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus used for reproducing a video signal, an audio signal or the like recorded on a magnetic tape used in a magnetic reproducing recording apparatus such as a VTR or DAT, or a reproducing recording. It relates to the device.

[0002]

2. Description of the Related Art The spread of VTRs in recent years has been remarkable, but as consumers' needs diversify, there has been an increasing demand for a device that can easily create and edit software. On the other hand, video software sales and rental businesses have become popular, and in these industries, there is a demand for a device that can perform software dubbing at high speed and easily in order to meet the increasing demand in a timely manner.

As a dubbing apparatus of this type, it is general to connect two or more ordinary apparatuses (VTRs) to perform reproduction and recording, and to perform real time (for dubbing one hour of software). It takes 1 hour) It will be dubbing. Therefore, in order to increase the dubbing efficiency, the number of recording devices is increasing.

In this case, the device to be used does not need to be particularly devised, but a part of the circuit may be changed in order to prevent the deterioration of the image quality. For example, image processing is performed to enhance the contour. And reducing noise, and sending the head output on the reproducing side to the recording side in a state where the minimum required signal processing is performed for recording.

FIG. 6 shows a track pattern formed on the tape when recorded by the above-mentioned conventional dubbing apparatus (that is, a normal VTR).

Although the structure of the apparatus is not particularly shown, as is well known, this type of VTR is provided with a tape guide drum for reproducing or recording a video signal, and the tape guide drum has two or four tape guide drums. Heads are installed. If two heads are 180 degrees, four heads are 90 degrees.
They are arranged on the circumference in the same plane at intervals of degrees.

[0007] The tape guide drum is rotated at a high speed while running the tape wound obliquely along a predetermined distance (for example, a half circumference) of the outer circumference of the tape guide drum configured as described above, and the standard TV signal of One field is recorded on one continuous track. Hereinafter, the pattern is formed so that the recording tracks are adjacent to each other while sequentially switching the heads to be recorded.

As a result, as shown in FIG. 6, the track pattern formed on the tape 1 runs in the direction of arrow A of the tape 1 from the lead angle α ₁ formed on the tape running surface of the tape guide drum. The track 2 is increased by the speed, and the tracks 2 inclined by the angle β are sequentially arranged.

Although the traveling direction of the head is set to the direction of arrow B here, unlike the figure, the head and the tape 1 are moved.
May be configured to travel in the opposite direction. At this time, the angle β is reduced by the traveling speed of the tape 1.

In the figure, the length L of one track 2, that is, the video signal track of one field is usually 1/2 of the field frequency of a standard TV signal on a tape guide drum equipped with two heads. Since the tape 1 is rotated and recorded in a state in which the tape 1 is wound around the tape 180 degrees, it corresponds to approximately 1/2 of the circumference of the tape guide drum, which will be described later in detail.

Further, when recording is performed by four heads arranged every 90 degrees, the diameter of the tape guide drum may be 2/3 that of two heads in order to obtain the same track pattern. It is necessary to record / reproduce by winding the tape at a winding angle of 3/2, that is, 270 degrees.

[0012]

However, in the above-mentioned configuration, when dubbing a video signal or an audio signal, since it is based on real-time dubbing, it is impossible to increase the speed with a single device. In order to reduce the time, there is no other way than to reduce the total dubbing time by simultaneously performing dubbing using a plurality of devices, resulting in high cost, large space, and complicated handling operations. There is a problem called.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a reproducing apparatus or reproducing apparatus which is low in cost, does not require a large space, and can be easily handled. Is.

[0014]

According to the present invention of claim 1, there are provided a plurality of first magnetic fields which are larger than the number of recording magnetic heads for recording an information signal of a magnetic tape on which the information signal is recorded. A first head means for reproducing, which has a head and is rotatable; and a lead angle different from the lead angle of the recording magnetic head when the information signal is recorded with respect to the magnetic tape, and when the information signal is recorded. The reproducing apparatus is provided with a first tape running means for running the magnetic tape at a speed higher than the tape speed of the magnetic tape.

The present invention according to claim 3 has a plurality of first magnetic heads, which is larger than the number of recording magnetic heads for recording the information signal, of the magnetic tape on which the information signal is recorded. The first reproducing head means capable of reproducing, at a read angle different from the read angle of the recording magnetic head when the information signal is recorded, and the tape speed of the magnetic tape when the information signal is recorded. A first tape running means for running the magnetic tape at a high speed, and another magnetic tape for copying the reproduced information signal,
Second tape running means for running the read angle at the time of reproduction and substantially the same speed as the running speed of the magnetic tape at the time of reproduction, and the number of first magnetic heads for recording the reproduced information signal. And a rotatable second head unit having the same number of the second magnetic heads as those of the reproducing and recording apparatus.

[0016]

According to the present invention of claim 1, the first tape running means comprises:
The magnetic tape on which the information signal is recorded has a lead angle different from that of the recording magnetic head when the information signal is recorded, and is faster than the tape speed of the magnetic tape when the information signal is recorded. While traveling at a speed, the first head means rotates to reproduce the information signal by the first magnetic head.

According to a third aspect of the present invention, the first tape running means changes the lead angle of the magnetic tape on which the information signal is recorded from the lead angle of the magnetic head for recording when the information signal is recorded to the magnetic tape. In addition, the magnetic tape is run at a speed higher than the tape speed when the information signal is recorded, the first head means rotates to reproduce the information signal by the first magnetic head, and the second tape running means Another magnetic tape for copying the reproduced information signal is made to run at the lead angle at the time of reproduction and at a speed substantially the same as the running speed of the magnetic tape at the time of reproduction, and the second head means rotates. Then, the information signal is recorded on another magnetic tape by the second magnetic head.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments.

FIG. 1 is a block diagram of a tape guide drum of a reproducing apparatus according to an embodiment of the present invention. That is, on the tape guide drum 9 used in the reproducing apparatus, six heads 11a to 11f are provided on the same plane at intervals of 60 degrees. The diameter D ₂ of the tape guide drum 9 is
It is set to about 3/5 of the diameter D ₁ of a tape guide drum (not shown, which will be described later in detail) of a normal head. For example, in the case of 8 mm VTR format, the diameter D is set.
₂ is about 24 mm. The tape guide drum 9 and the heads 11a to 11f constitute the first head means.

The tape 1 described in the conventional example is wound around the tape guide drum 9, and the tape is played back by the first tape running means (not shown) at a speed faster than the speed at which it was recorded. .. The tape 1 is wound around the tape guide drum 9 by 310 degrees, and the signal is reproduced by 300 degrees which is 5/3 times the normal winding angle of 180 degrees.

As shown in Matazu 2, tape 1 to the tape guide drum 9, is wound inclined by a relative angle alpha _2, the alpha ₂ (not shown) fixed portion of the tape guide drum 9 It is also the angle of the lead that serves as a running guide for the tape 1 provided on the. Incidentally, the lead angle in the normal case is α ₁ as described in the conventional example.

That is, the tape 1 has a track pattern recorded by an ordinary VTR, and when this tape 1 is used as a master tape to produce a copy tape,
This indicates that the lead angle of the tape guide drum 9 for reproducing the tape 1 is different from that of a normal VTR.

Next, the operating principle of the above embodiment will be described.

FIG. 2 shows a track 2 recorded on the tape 1.
Pattern and the lead angle α ₂ of the tape guide drum 9
FIG. 3 is a diagram showing the relationship of FIG. 3, and FIG. 3 is a diagram for calculating the lead angle α ₂ .

As shown in the conventional example, when the tape 1 is stationary, the normal head locus 3a is represented by the one-dot chain line in FIG. Since the tape 1 is traveling in the direction of arrow A at a predetermined speed V during recording, the head relatively moves on the tape 1 in the direction indicated by arrow B to form the pattern of the track 2.

On the other hand, the locus 3b of the head of this embodiment when the tape 1 is stationary is represented by the chain double-dashed line in FIG. Here, the tape running speed is n times that of the conventional one, that is, n
Consider that the same track as the track 2 is formed on the tape 1 even when changed to V.

As will be described below from the conclusion, the lead angle α ₂ is
Assuming that the running speed of the tape 1 during recording is V and the rotation frequency of a normal tape guide drum (diameter D ₁ ) is f ₁ , Q = V / (π · D ₁ · f ₁ ) and n is a positive integer. , Α ₂ = α ₁ / {1 ± (n−1) · Q} is set. Here, the sign ± is the tape 1
The case where the traveling direction of # 1 and the traveling direction of the heads 11a to 11f are the same is +, and the opposite case is −. The meaning of this expression will be described in detail with reference to FIG. In the present embodiment, (n + 1) corresponds to the number of heads, and therefore n = 5. However, in order to generalize the formula, n is used.

In the figure, the traveling direction of the tape 1 is the x direction,
The width direction of the tape 1 is defined as the y direction. The normal head traveling speed is V ₁ , the traveling speeds of the heads 11a to 11f in this embodiment are V ₂ , and the x-direction component thereof is V _2x ,
If the y-direction component is V _2y , it is clear from FIG. 3 that V _2x = V ₁ · cos (α ₁ ) + (n−1) · V V _2y = V ₁ · sin (α ₁ ) and the tape guide Lead angle α set on drum 9
₂ can be represented by tan (α ₂ ) = V _2y / V _2x = V ₁ · sin (α ₁ ) / {V ₁ · cos (α ₁ ) + (n−1) · V}, but V _{Since 1} is the peripheral speed on the outer circumference of the tape guide drum of the normal head, it is expressed by V ₁ = π · D ₁ · f ₁ , and the normal lead angles α ₁ and α ₂ are both very small values. Therefore, it can be approximated as follows.

Α ₂ = α ₁ / {1+ (n−1) · V / (π · D ₁ · f ₁ )} = α ₁ / {1+ (n−1) · Q} Therefore, the tape guide drum 9 By setting the lead angle α ₂ in this way, the track formed on the tape 1 completely overlaps the conventional track 2, and the tape 1 is moved at the speed n.
Even when traveling at V (that is, n times faster than the conventional speed), the conventional track 2 can be completely scanned.

Further, the traveling speed V ₂ of the heads 11a to 11f is as follows: V ₂ ² = V _2x ² + V _2y ² = V ₁ ² + 2 · (n−1) · α ₁ · V ₁ · V + (n-1) It can be expressed by ² · V ² , and assuming that the rotation frequency of the tape guide drum 9 is f ₂ , V ₂ = π · D ₂ · f ₂ , and thus the diameter D ₂ of the tape guide drum 9 is similarly defined. , D ₂ = D ₁ · (f ₁ / f ₂ ) · {1 + 2 · (n−1) · α ₁ · Q + (n−1) ² · Q ² } ^1/2 .

Therefore, the diameter D ₂ of the tape guide drum 9
Is set in this way, the head 11a on the tape 1
Since the relative speed of ~ 11f is completely the same as that of a normal VTR and the recording wavelength does not change, the signal of track 2 can be perfectly reproduced even when tape 1 is run at a speed n times faster than the conventional one, and it is exactly the same. It is also possible to record a signal and form the same track pattern.

It is also necessary to consider the length of the track 2. As described above, since the running directions and relative velocities of the heads 11a to 11f when scanning the tape 1 are the same, the lengths are also the same if the scanning time is the same.

Since the scanning time is generally obtained by dividing the winding length of the tape around the tape guide drum by the traveling speed of the head, the scanning time in the normal case is t ₁ , and the scanning time in the case of the present embodiment. It was a t _2, if the wrap angle of the tape 1 to tape guide drum 9 and _{θ 2, t 1 = (D} 1 · θ 1/2) / V 1 = θ 1 / (2 · π · f 1) _{t 2 = (D 2 · θ} 2/2) / V 2 = θ 2 / (2 · π · f 2) next, since t ₂ is equal to _{t 1, θ 2 / f 2} = θ 1 / f 1 become. It should be noted that θ ₂ is 270 degrees, which is 3/2 times the normal winding angle θ ₁ of 180 degrees when four heads are used, and 5 times when six heads are used as in the present embodiment. It becomes 300 degrees, which is / 3 times, and is generally represented by θ ₂ = 2 · θ ₁ · n / (n + 1). Therefore, the above-mentioned D ₂ and f ₂
Is D ₂ = D ₁ · (n + 1) / (2 · n) · {1 + 2 · (n−1) · α ₁ · Q + (n−1) ² · Q ² } ^1/2 f ₂ = 2 · f ₁ · n / (n + 1).

With respect to the reproducing apparatus configured as described above, a reproducing method will be described with reference to FIGS. 4 and 5.

FIG. 4 shows the relationship between the track pattern on the tape 1 and the reproducing head. The tape 1 runs in the direction of arrow A, and the number of the head used for reproducing each of the tracks 12 to 19 is indicated by the arrow. Further, FIG. 5 schematically shows a method of reproducing the signal recorded on the tape 1 by using the reproducing apparatus of the present embodiment.

In this embodiment, n is 5, the tape guide drum 9 rotates at 5/6 times the standard TV frequency, and at 50 Hz in the case of the NTSC system (60 Hz). That is, f ₁ is 30 and f ₂ is 50. Also, θ
_{Since 1} is 180 degrees, θ ₂ is set to 300 degrees (radian conversion is required at the time of calculation).

Therefore, the tape guide drum 9 rotates 5/6 for each field, and the heads 11a to 11f are provided at intervals of 60 degrees as described with reference to FIG. / 5 field (1/30
The tape 1 is scanned with a shift of 0 seconds). That is, it is possible to simultaneously reproduce video signals for 5 fields.

Further, since the running speed of the tape 1 is five times faster than the conventional speed, if the track 12 is first reproduced by the head 11a, the head 11a scans the adjacent area by the head 11b when the head 11a scans 1/5 field. Truck 13
Will start playing exactly. And then 1/5
The tracks 14 to 17 are reproduced by the heads 11c to 11f and the track 18 is reproduced by the head 11a while delaying by the field.

Heads 11b are similarly provided on and after track 19.
It is possible to reliably reproduce all signals without excess or deficiency by sequentially scanning from and repeating this process. Moreover, since the speed of the tape 1 is five times that at the time of recording, this is unavoidable, and it becomes possible to reproduce the tape 1 in 1/5 of the time at the time of normal recording.

Next, a recording apparatus having the same structure as the reproducing apparatus described above (that is, the second head means composed of a tape guide drum to which the same number of recording heads as the reproducing apparatus are attached, the same tape as the reproducing apparatus) A method of recording a reproduced signal on another tape (that is, dubbing) by a reproducing / recording apparatus further having a second tape running means for running at a speed) will be described.

First, it is sufficient to send the signal of 5 times the normal signal obtained by the reproducing apparatus or the reproducing apparatus of the reproducing / recording apparatus as it is to the recording apparatus side, and then perform the recording operation on another tape. It seems that there is no particular problem in transmitting and receiving this signal.

Regarding the recording of the above reproduction signal, the tape speed is set to 5 times the normal speed (the same as during reproduction), and 6 fields are used to record 5 fields at a time. Of course, since the head spacing and other mechanical specifications are the same as those on the reproducing side, the recording timing and the track pattern formed on the tape are the master tape (here, tape 1) created by an ordinary VTR. Will be exactly the same as.

Azimuth recording is usually performed in order to reduce crosstalk between adjacent tracks. To deal with this, the gap azimuth of each of the heads 11a to 11f is set to the heads 11a, 11c and 11e and the head 11a.
It is possible to set it differently for b, 11d, and 11f, and to match it with a normal VTR.

Thus, when the reproducing apparatus or reproducing / recording apparatus according to the present invention is used, a tape produced by a normal recording apparatus is used as a master tape, and the time is 1/5 of the time when information is recorded on the tape, which is easy. You can make copy tapes on.

As described above, according to the present invention, the tape running speed is set to n times the normal speed, and even when the (n + 1) heads scan n tracks sequentially and in parallel, Since the locus of the head in the upper part is exactly the same as the normal track pattern, it is possible to simultaneously reproduce or record signals of n times the normal level. In other words, a copy tape can be reliably manufactured at a speed n times as fast as usual, and a high-speed dubbing can be easily performed with a single device without complicating the mechanism or increasing the size. Since we can provide the device,
It is possible to reduce cost and space.

In the above embodiment, the tape is applied to the VTR magnetic tape, but the present invention is not limited to this, and any tape of a recording / reproducing type by a rotary head may be used for DAT, for example.

Further, in the above embodiment, n is set to 5 and the number of heads which are the first magnetic head for reproduction or the second magnetic head for recording is set to 6. However, the number of heads is not limited to this, and the tape travels. Any number of speed increases is possible.

Further, in the above embodiment, the rotation speed of the first head means or the second head means is indicated by the rotation frequency, but in short, the traveling speed of the head is the same as when the signal track recorded on the tape is recorded. It only needs to be able to scan at a speed.

[0049]

As is apparent from the above description, the present invention has the advantages that it is low in cost, does not require much space, and can be handled easily.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a tape guide drum of a reproducing device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a lead angle and a track pattern of the tape guide drum of the embodiment.

FIG. 3 is a schematic diagram illustrating calculation of a lead angle of the tape guide drum of the embodiment.

FIG. 4 is a diagram illustrating a relationship between a head and a track pattern of the embodiment.

FIG. 5 is a schematic diagram for explaining the operation of the reproduction system of the same embodiment.

FIG. 6 is a diagram illustrating a track pattern recorded by a conventional recording device.

[Explanation of symbols]

 1 tape 2 tracks 9 tape guide drum 11a-11f head 12-19 tracks

Claims (4)

[Claims] 1. A magnetic tape having a plurality of first magnetic heads, the number of which is larger than the number of recording magnetic heads for recording the information signal of a magnetic tape having the information signal recorded thereon, and which is rotatable for reproduction. 1 head means and a lead angle different from the lead angle of the recording magnetic head for recording the information signal to the magnetic tape, and a speed faster than the tape speed of the magnetic tape when the information signal is recorded. so,
A reproducing apparatus comprising a first tape running means for running the magnetic tape. 2. The rotation speed of the first head means is such that when the information signal is reproduced by the first head means, the rotation speed is such that it can be scanned corresponding to the original recording pattern of the information signal of the magnetic tape. The reproducing apparatus according to claim 1, wherein the reproducing apparatus is speed. 3. A rotatable reproducing first magnetic head having a plurality of first magnetic heads, the number of which is greater than the number of recording magnetic heads for recording the information signal of the magnetic tape having the information signal recorded thereon. 1 head means and a lead angle different from the lead angle of the recording magnetic head for recording the information signal to the magnetic tape, and a speed faster than the tape speed of the magnetic tape when the information signal is recorded. so,
A first tape running means for running the magnetic tape, and another magnetic tape for copying the reproduced information signal are provided at the read angle at the time of reproduction and at the read angle of the magnetic tape at the time of reproduction. It has a second tape running means for running at a speed substantially the same as the running speed, and a second magnetic head for recording the reproduced information signal, the number of second magnetic heads being the same as the number of the first magnetic heads, and rotating. A reproducing / recording device comprising a possible second head means. 4. The rotation speeds of the first head means and the second head means are the same when the information signal is reproduced by the first head means or when the information signal is recorded by the second head means. 4. The reproducing / recording apparatus according to claim 3, wherein the magnetic tape has a predetermined rotation speed capable of scanning corresponding to the original recording pattern of the information signal of the magnetic tape.