JPH03280202A - Magnetic recorder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording device suitable for application to, for example, a VTR.

[Summary of the invention]

The present invention relates to a magnetic recording device suitable for application to, for example, a VTR, in which a tape is wound around a rotating drum having a first drum diameter at a first tape winding angle, and a first magnetic recording device having a memory is provided.
In contrast to the standard method in which the video signal processed by the digital processing section of The tape is wound with a second tape wrapping angle, and the product of the first drum diameter and the first tape wrapping angle is equal to the product of the second drum diameter and the second tape wrapping angle. , a first processing clock signal used in the first digital processing section and a second processing clock signal related to the ratio of the first and second drum diameters to perform time axis expansion on the video signal. By having two digital processing units and achieving compatibility with the standard system, the rotating drum can be downsized without increasing the number of rotations of the rotating drum.

[Conventional technology]

Conventionally, in camera-integrated VTRs and the like, it has generally been proposed to reduce the diameter of the rotating drum as one means for downsizing.

Furthermore, when the diameter of the rotating drum is made smaller, the number of rotations is adjusted according to the diameter (the smaller the diameter, the faster the rotation speed becomes), or the number of heads provided on the rotating drum is increased.

Application of this reduction in the diameter of the rotating drum to a four-head standard diameter rotating drum as shown in FIG. 12 is being considered.

In this FIG. 12, (1) is, for example, a digital VT
A rotating drum having a diameter of, for example, 62φ, such as R, is provided, and heads (2a) and (2C) and heads (2b) and (2d) are arranged on this rotating drum (1), respectively, facing each other at 180 degrees. There is. And this rotating drum (1
) rotates as indicated by the dashed arrow, and is guided by the tape guide drum and guides (5) and (6) that guide the magnetic tape (7) so that it is wound at a predetermined wrapping angle, as indicated by the solid arrow in the figure. A head (2a) placed on this rotating drum [1] with respect to a magnetic tape (7) running in the direction shown.
and (2C), and the heads (2b) and (2d) are configured to scan diagonally. And this rotating drum (1
) by heads (2a) and (2b) and head (
2c) and (2d) are configured to record recording signals on the magnetic tape (7) or reproduce them from the magnetic tape (7).

[Problem to be solved by the invention]

However, as mentioned above, the standard diameter rotating drum (1)
Simply reducing the diameter of the standard diameter rotating drum (
1) and a rotating drum (1) with a smaller diameter than the standard diameter rotating drum (1) are respectively used to record magnetic tape (1) on which recording signals are recorded.
7) cannot be reproduced in the same way. In other words, they will no longer be compatible with each other.

This is a magnetic tape ( 7) Since the top length is short, that is, the recording length (track length) of the recording signal recorded is short as the head of this small diameter rotating drum forms a track on the recording surface of the magnetic tape (7). It becomes because it becomes.

Therefore, in order to obtain this compatibility, conventional camera-integrated V
As is done in TR, it is conceivable to increase the rotation speed of a rotating drum having a diameter smaller than that of the standard diameter rotating drum (1) (for example, In a camera-integrated VTR with a smaller rotating drum, the number of rotations of the rotating drum is 20 Orr.
, p, m,).

However, in this case, the spatula (2) of the rotating drum
The noise caused by the collision between the rotating drum head (2) and the magnetic tape (7) becomes louder.
It becomes difficult to adjust the contact of η.

In addition, as conventionally done in camera-integrated VTRs, etc., the number of blades [2] of the rotating drum having a diameter smaller than that of the standard diameter rotating drum (1) is It is conceivable to increase (for example, double) the number of heads (2) in ).

However, in this case, the increased head (2) and
The use of a rotary transformer (not shown) increases the cost of equipment that uses this downsized rotating drum.

The present invention has been made in view of the above problems, and an object thereof is to propose a magnetic recording device in which the size of the rotating drum can be reduced without increasing the number of rotations of the rotating drum.

[Means for Solving the Problems] As shown in FIGS. 1 and 2, for example, the present invention provides a rotating drum (1) having a first drum diameter D1, and a tape (7) with a first tape winding angle Q1. ) and record the video signal processed by a first digital processing section with memory onto a tape, whereas the rotating drum has a second drum diameter D2 smaller than the first drum diameter D1. The tape (7) is wound around the drum (3) with a second tape winding angle Q2 that is larger than the first tape winding angle Q1, and the first drum diameter and the first tape winding angle are Angle 0. The product is equal to the product of the second drum diameter D2 and the second tape wrapping angle Q2, and the first processing clock signal used in the first digital processing section and the first and second drum diameters are , , D2, a second processing clock signal related to the ratio of
Digital processing 8 (60) is provided to obtain compatibility with the standard system.

[Effect]

According to the present invention, the first drum diameter D1 and the first
The product of the second drum diameter D2 and the second tape wrapping angle Q2 is made equal to the product of the tape wrapping angle Q1, and the digital processing section (60) of M2 is used in the first digital processing section. A second processing clock signal related to the ratio of the first processing clock signal and the first and second drum diameters, D2, performs time axis expansion on the video signal to obtain compatibility with standard formats. So, the rotating drum (1)
The rotating drum (1) can be downsized without increasing the number of rotations.

〔Example〕

An embodiment of the magnetic recording apparatus of the present invention will be described in detail below with reference to FIGS. 1 and 2.

First, in FIG. 2, (3) is a rotating drum, and heads (2a) and (2C) and heads (2b) and (2d) are arranged on this rotating drum (3), respectively, facing each other at 180 degrees. ing. And this rotating drum (3
) has a magnetic tape (7), not shown.
) is scanned diagonally with respect to the magnetic tape (7) guided by the tape guide drum and guides (5) and (6) that guide the tape so that it is wound at a predetermined wrapping angle. and,
This rotating drum (3) rotates the head (2a) and (
2b) and heads (2c) and (2d) are adapted to record recording signals on or reproduce recording signals from the magnetic tape (7). Also, this rotating drum [3
] is 34φ, whereas the diameter of the standard diameter rotary drum (1) shown in FIG. 4 is 62φ.

In this case, a rotating drum (1) with a standard diameter is arranged so that two-channel simultaneous recording is performed alternately with heads (2a) and (2b) and (2c) and (2d), respectively, and the rotational speed of this drum (1) is Suppose that is 360Or, p, m. Then, the drum diameter of this standard diameter rotating drum (1) is set as Dl, the effective winding angle (not including the overlap) is set as Q, and this standard diameter rotating drum (1) is set as Dl.
) is the drum diameter of the rotating drum (3), which is smaller in diameter than D.
2, and the effective winding angle (not including the overlap) is Q2. And this rotating drum in Figure 2 (
3) The relationship between the drum diameter D2 and the effective winding angle Q2 is determined as shown in the following equation.

D2 Qa = Dr Q+...
・(1) Thus, the rotation speed of the rotary drum [3] having a drum diameter D2 smaller than the drum diameter D1 of the standard diameter rotary drum (1) is set to be the same as the rotation speed of the a-diameter rotary drum (υ). However, mutual compatibility can be obtained.

FIG. 1 shows the circuit of this example. In FIG. 1, (8) is a video signal input terminal into which, for example, video signals R, G, and B are input. ). The IJ circuit (9) converts the video signals R, G, and B from the video signal input terminal (8) into a luminance signal Y and color difference signals P, P, and converts them into an A/D converter (analog/ The signals are supplied to encoders (TCI (Time Combined Integration) encoders) (11) through digital converters (10).

The encoder 11) connects the matrix circuit (9) to the A/
The digital luminance signal Y and color difference signals Pr and Pb supplied through the D converter (10) are compressed or expanded to produce two time division multiplexed signals, that is, a color difference signal P, which is multiplexed with a TCI signal, and a color difference signal P. Signal P.

The TCI signal multiplexed by the D/A converter (digital/analog converter) (12) and (13) and (
Addition circuits (16) and (1) through (14) and (15)
7) and (18) and (19), respectively.

Addition circuits (16) and (17) and (18) and (1
9) adds the TCI signals from the D/A converters (12) and (13) and (14) and (15), and the burst signal and horizontal/vertical synchronization signal from the timing generation circuit (32), respectively; The TCI signal to which this burst signal and horizontal/vertical synchronization signal are added is supplied to pre-emphasis circuits (20) and (21) and (22) and (23), respectively.

Pre-emphasis circuits (20) and (21) and (2
The TCI signals supplied to 2) and (23) are subjected to high frequency emphasis processing, and then FM modulated by FM modulators (24) and (25) and (26) and (27), respectively. This FM modulated TCI signal is then sent to the recording amplifier (
28) and (29) and (30) and (31) through heads (2a) and (2b) and (2C) and (2
d) and are azimuthally recorded on the recording surface of the magnetic tape (7).

The timing generation circuit (32) is a matrix circuit (9)
, A/D converter (10), encoder (11), D
A horizontal/vertical synchronizing signal or a timing signal synchronized with the horizontal/vertical synchronizing signal and a processing clock signal are supplied to the /A converters (12) to (15), respectively, and a burst signal is supplied to the adder circuits (16) to (19). and horizontal/vertical synchronization signals, respectively.

The above-mentioned A/D converter (10), encoder (11), D/A converters (12) to (15), and timing generation circuit (32) are integrated into the digital processing section (60).
Configure.

Now, in this example, it is further made possible to record four channels simultaneously. That is, as shown in FIG. 5, the standard diameter rotating drum (1) for simultaneous two-channel recording shown in FIG.
Compared to a magnetic recording apparatus having a rotary drum (3), the time axis of the present magnetic recording apparatus having a rotating drum (3) is extended to enable simultaneous recording of four channels.

In order to do this, the frequency of the processing clock signal of the magnetic recording device of this example that uses the rotating drum (3) is set to be lower than the frequency of the processing clock signal of the magnetic recording device that uses the rotating drum (1) of standard diameter. , by lowering it by a predetermined percentage.

Here, used in a magnetic recording device using a rotating drum (1) with a standard diameter (for example, 62φ) as shown in FIG.
Let fl be the frequency of the processing clock signal for generating the TCI signal, and let the effective winding angle of the rotating drum (1) of this standard diameter be Q+. And this Figure 1A
A processing clock signal for generating a TCI signal used in a magnetic recording device using a rotating drum [3] having a smaller diameter (for example, 34φ) than the standard diameter rotating drum (1) shown in FIG. If the frequency is f2 and the effective winding of this rotating drum (3) is the angle Q2, then
The frequency f2 of the processing clock signal used in the magnetic recording apparatus using this rotating drum (3) is set as follows.

As is clear from the above equation (2), a four-channel simultaneous recording magnetic recording device using a rotating drum (3) having a smaller diameter than the standard diameter rotating drum (1) is used as the standard diameter rotating drum (1). This rotating drum (3
) drum diameter D2 and effective winding is the relationship between angle Q2
2 Q4 = D+ Q+, and the processing speed of the magnetic recording device using this rotating drum (3) is good.

Therefore, if you do as described above, the standard diameter rotating drum (1
) is 3600r, p, m, the rotational speed of this rotating drum (3) is also 3600r1. p, m
, can be done.

Moreover, by doing as described above, the position of the spatula (2) can be changed as shown in FIGS. 3 and 4.

That is, in FIG. 3, head responsibility 2a) and (2C)
are arranged on the rotating drum (3) at positions facing each other at 180 degrees, heads (2b) and (2d) are arranged at positions corresponding to each other at 180 degrees, and heads (2a) and (2
C), so that they are placed opposite each other by 90 degrees.

Figure 4 also shows a rotating drum (3) with heads (
2a), (2b), (2c)', (2d).

As mentioned above, the TCI signals recorded simultaneously on four channels are reproduced by the heads (2a) and (2b) and (2C) and (2d), respectively, and these reproduced TCI signals are transmitted to the reproduction amplifier (33) and ( 34) and (35) and (3
6) to demodulators (37) and (38) and (39) and (40), respectively.
) and (38) and (39) and (40),
After being demodulated, the de-emphasis circuit (41) and (
42), (43) and (44), respectively, and the de-emphasis circuits (41) and (42) and (4
3) and (44), the high range is attenuated, respectively, and the A/
The signals are supplied to the time base error correction circuit (49) through D converters (45) and (46) and (47) and (48), respectively.

Each TCI signal supplied to the time base error correction circuit (TBC (time base collector)) (49) is written to a memory (not shown), and then read out from the timing generation circuit (32). The signals are read out using a clock signal and supplied to respective decoders ETCI (time combination integration) decoders (50).

This decoder (50) compresses or expands the supplied digital TCI signals, respectively, to generate luminance signals Y1 and color difference signals Pr and Pb. This decoder (50)
The luminance signal Y1 and the color difference signals Pr and Pb from the D/A
The signal is supplied to a matrix circuit (52) through a converter (51), converted into video signals R, G, and B by this matrix circuit (52), and supplied to, for example, a monitor receiver or the like through an output terminal (53). In addition, the above-mentioned A/D converters (45) to (48), time axis error correction circuit (49)
, a timing generation circuit (32), and a decoder (50) constitute a digital processing section (60). In this example,
Heads (2a) and (2b) during recording and playback.

(2c), (2d) and amplifiers (28) to (31
) or amplifiers (33) to (36), illustrations and explanations of the switching means, etc. are omitted.

Figures 6 to 11 show other examples of this example, in which the standard diameter rotating drum (1) is used when the rotation speed of the standard diameter rotating drum (1) is 360 Or, p, m. This is a modification of the four-head rotary drum (3) for simultaneous four-channel recording shown in FIG. 2, which is compatible with the magnetic recording device of the present invention.

6 to 8 show a six-head rotary drum (3), in which case the number of revolutions may be 240 Or, p, m. Figure 6 shows heads (2a), (2b), heads (2c),
(2d) and heads (2e) and (2f), respectively.

FIG. 7 shows heads (2a) and (2d) and head (2b) mounted on a rotating drum (3) at opposing positions of 180 degrees.
and (2e), heads (2C) and (2f) are arranged, and heads (2a) and (2b), heads (2b) and (2C), heads (2C) and (2d), and heads (2d
) and (2e), the heads (2e) and (2f), and the heads (2f) and (2a) are arranged at intervals of 60 degrees.

Figure 8 shows heads (2a) in one row on a rotating drum (3).
.

(2b), (2c) and 180
Heads (2d), (2e), (
2f) arranged in one row.

9 to 11 show an eight-head rotary drum (3), in which case the number of revolutions may be 1800 r, p, m.

Figure 9 shows heads (2a), (2b), (2c), (2d) mounted on a rotating drum (3) at 90 degree intervals.
), head (2e), (2f) and head (2g),
(2h).

Figure 10 shows heads (2a), (2b), (2c), (2
d>, (2e), (2f), (2g) and (2h
).

Figure 11 shows a rotating drum (3) with a head (2a) and (
2b).

Arrange (2C) and (2d) in one row, and connect these positions and 1
Heads (2e), (2f), located 80 degrees opposite each other.
(2g) and (2h) are arranged in one row.

As is clear from the above, the drum diameter of the standard diameter rotating drum (1) is Dl, the effective winding is Ql, and the corner is Ql.
Let fl be the frequency of the processing clock signal used in the magnetic recording device that uses this rotating drum (1), and let the drum diameter of the standard diameter rotating drum (1) and the drum diameter of the smaller diameter rotating drum (3) be fl. D2, the effective winding is the drum diameter D2 of the rotating drum (3) and the winding, where the angle is Q2 and the frequency of the processing clock signal used in the magnetic recording device using this rotating drum (3) is f2. The relationship between the angle Q2 is D2Q2 = DlCL, and the frequency f2 of the processing clock signal used in the magnetic recording device using this rotating drum (3) is the rotational speed of the standard diameter rotating drum (1). Even if they are the same, compatibility can be maintained, so it is possible to downsize the head (2) and generate less noise (slapping) from the head (2) due to high-speed rotation. Also, using a large number of heads (2) means a standard diameter rotating drum (1).
It is possible to maintain compatibility even at a rotation speed lower than that of .

It should be noted that the present invention is not limited to the above-described embodiments, and can of course take various other configurations without departing from the gist thereof.

〔Effect of the invention〕

According to the present invention, the product of the first drum diameter and the first tape wrapping angle is made equal to the product of the second drum diameter and the second tape wrapping angle, and the second digital processing section The video signal is subjected to time-axis expansion using the first processing clock signal used in the first digital processing section and the second processing clock signal related to the ratio of the first and second drum diameters, and the video signal is converted into a standard signal. Since the system is compatible with other systems, it is possible to downsize the rotating drum without increasing the number of rotations of the rotating drum.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the magnetic recording device of the present invention;
FIG. 2 is a diagram showing an example of a rotating drum used in the present invention, FIGS. 3, 4, and 6 to 11 are diagrams showing other examples of the rotating drum, and FIG. is a diagram used to explain the present invention, and FIG. 12 is a diagram showing an example of a rotating drum used in a conventional VTR. (1) and (3) are rotating drums, (7) is magnetic tape,
(9) and (52) are matrix circuits, (10) and (
45) to (48) are A/D converters, (11) are encoders, (12) to (15) and (5) are D/A converters, (32) are timing generation circuits, and (49) are time bases. Error correction circuit, (50) is a decoder, Dl is the drum diameter of the standard diameter rotating drum, D2 is the drum diameter of the rotating drum whose drum diameter is smaller than that of the standard diameter rotating drum, and Q+ is the drum diameter of the standard diameter rotating drum. Wrapping is square, Q
2. The winding of a rotating drum with a drum diameter smaller than that of a standard diameter rotating drum is an angle. No. 5 Example of conventional fixed rotation F5m No. 12

Claims (1)

[Claims] A tape is wound around a rotating drum having a first drum diameter at a first tape winding angle, and a video signal processed by a first digital processing section having a memory is recorded on the tape. In contrast to the standard system in which the rotating drum has a second drum diameter smaller than the first drum diameter, a second tape winding angle larger than the first tape wrapping angle is used.
The product of the first drum diameter and the first tape wrapping angle is the product of the second drum diameter and the second tape wrapping angle. A time axis is applied to the video signal by a second processing clock signal, which is equal to the product of A magnetic recording device characterized in that it has a second digital processing section that performs decompression to obtain compatibility with the standard system.