JPS63112847A - Rotary head type recorder - Google Patents

Abstract

PURPOSE:To execute a tracking control of a four-frequency system by a device being capable of recording simultaneously three system signals, by allowing four kinds of pilot signals for a tracking control and four heads for recording these signals to correspond to each other to one-to-one, and switching the corresponding relation by a first mode and a second mode. CONSTITUTION:When usual recording is switched to high speed recording by a switch 24, a signal of a high level is inputted to a DATA input of a D-flip 26. By a rise of the next clock signal, a switching signal is transmitted to changeover switches 32, 33, a usual recording side (L) is switched to a three system recording side (H), and pilot signals f2, f4 are replaced and supplied to a head. Subsequently, in case of returning the three system recording to the usual recording, when the changeover switch 24 is returned to the usual side (L), the D-flip-flop 26 returns an output signal to a low level by the next clock and the changeover switches 32, 33 are operated. In such a way, in case of recording simultaneously video signals of three systems, and also, in case of recording a video signal of one system, four kinds of pilot signals can be recorded so as to obtain a prescribed array by all the same circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head type recording device, and in particular to a rotary head type recording device.
The present invention relates to an apparatus for recording signals by winding a tape-shaped recording medium over a angular range of 2,700 or more around a cylinder member having four heads that rotate with a phase difference of .degree.

[Conventional technology]

This type of device has traditionally been used for the purpose of reducing the diameter of the rotating head cylinder of a VTR, and in this type of VTR, four heads that rotate with a phase difference of 90 degrees from each other are sequentially used to generate one field of video signal. It is configured to record.

On the other hand, an application has already been filed by the present applicant (Patent Application No. 61
It is also possible to use a VTR with the head configuration described in "-147080" as a device capable of capturing and recording three times as many screens as normal. In this case, three of the four heads mentioned above can be used. Recording will be performed using both at the same time.

FIG. 7 shows an example of the arrangement of the timing head of the device. The magnetic heads R and R' are rotating magnetic heads having the same azimuth angle, and the timing heads L and L' are rotating magnetic heads having the same azimuth angle. Also, magnetic head R
, L, R', and L' have rotational phases that differ by 90 degrees, and three systems of video signals are manually applied to three of the four magnetic heads R, L, R', and L', respectively. To the rotating drum 1 by the tape kite posts 2 and 3,
These three video signals are recorded on a magnetic tape 4 that is wound over an angular range of 270° or more.

FIG. 8 shows the relationship between the recording tracks recorded on the magnetic tape 4 and each magnetic head.

As shown in FIG. 8, when the magnetic head R is at the recording start timing, the magnetic head L' is at the recording end timing, and since the magnetic head L is 90 degrees ahead of the magnetic head R, the magnetic head L' is at the recording end timing. Since the magnetic head R' has moved forward by 180 degrees, it has finished recording one 2/3 field.

In this way, each magnetic head records every 1/3 field in the order of R)L'→R'→L.

By the way, when trying to play back the three video signals recorded as described above, it is also possible to play back the three video signals simultaneously using three rotating heads that simultaneously trace the recording medium in the same way as during recording. However, the running speed of the magnetic tape 4 is set to 1/3 of that of recording, and the four heads are used in the order of R+L→R'→L'→R... to sequentially record three systems of video signals. It is possible to reproduce it.

For example, the three video signals mentioned above are 1/3 of each other.
When video signals relating to the same image with shifted field timings are recorded, if these are sequentially reproduced field by field, a slow-motion reproduced image that can follow even fast-moving images can be obtained.

[Problem that the invention seeks to solve]

However, when trying to apply the well-known four-frequency method as a tracking control method to the system as described above,
This results in an extremely complicated circuit configuration in which four types of pilot signals must be superimposed at different timings on three systems of video signals.

Also, if we record video signals related to the same image shifted by <1/3 field timing as described above as three-system recording, and when we consider playing back these in sequence one frame at a time, The arrangement of pilot signals on the magnetic tape must be the same as that of a normal single-system recorded magnetic tape. Therefore, when recording time between three systems,
It is necessary to change the order of the pilot signals superimposed on the video signal depending on whether one system of normal recording is performed or not, which complicates the negative layer circuit configuration.

In view of the above-mentioned problems, the present invention provides a rotary head type recording device that is capable of simultaneously recording three systems of signals and is capable of applying four-frequency tracking control using an extremely simple circuit configuration. The purpose is to

[Means for solving problems]

For this purpose, in the present invention, a tape-shaped recording medium is wound over an angular range of 270" or more around a cylinder member equipped with four heads that rotate with a phase difference of 90 degrees from each other. In the signal recording device, four types of pilot signals for tracking control and the four heads for recording these are associated in one-to-one correspondence,
A first mode in which each of the four types of pilot signals is recorded using the associated heads, and one of the four heads is sequentially used for recording, and three of the four heads are recorded. The above-mentioned correspondence relationship is switched between the second mode and the second mode in which recording is performed simultaneously.

[Effect]

By configuring as described above, the four types of pilot signals need only be superimposed on the video signals supplied to the respective determined heads, and there is no need for a complicated switching circuit and its control circuit. All that is required is a circuit that switches the correspondence between the mode and the second mode.
The circuit configuration is extremely simple.

(Example〕 Hereinafter, one embodiment of the present invention will be described in detail.

FIG. 1 is a diagram showing the main part configuration of a VTR as an embodiment of the present invention, and FIG. 2 is a diagram showing the general configuration of the entire embodiment.

In FIG. 2, 5 is an imaging lens, 6 is a half mirror located on the optical axis of the imaging lens 5, 7 to 9 are imaging circuits provided on the optical axis of the half mirror 6, and 10 is a vertical A V driver 11 generates a scanning signal, an H driver 11 generates a horizontal scanning signal, and these V drivers 10,
The output of the H driver 11 is sent to the imaging circuits 7-9.

12 is a pulse generator that generates a pulse that shifts the phase of the video (i) output from the imaging circuits 7 to 9 by 1/3 field; 13 is a synchronization signal generation circuit that provides a simultaneous signal to the three outputs; 14 is a This is a signal processing circuit for converting the three video signals into a signal form suitable for recording, and the circuit 14 performs well-known processing such as FM modulating the luminance signal and low frequency conversion of the chroma signal.

In the configuration described above, the internal image of the subject passing through the imaging lens 5 is transmitted and reflected by the half mirror 6, guided to the imaging circuits 7 to 9, and converted into an electrical signal. At that time, ■Driver 10. A signal having a phase difference of 1/3 of one field of the magnetic tape is applied to the H driver 11 from the pulse generator 12. The H driver 11 provides horizontal and vertical scanning signals shifted by 1/3 field to the imaging circuits 7 to 9. The image pickup circuits 7 to 9 are provided with the horizontal and vertical scanning signals described above in addition to the converted electrical signals.

The outputs obtained from the image pickup circuits 7 to 9 are processed by the signal processing circuit 14 together with the synchronization signal obtained from the synchronization signal generation circuit into a signal format suitable for recording and three video signals Sig as described above.
,1 ,Sig,2. Sig, 3 is obtained.

The three video signals Sjg, ], Sig, 2. Sig
, 3 are shown in FIG. 5, and these are manually input to the magnetic head via the switching circuit 15 as recording signals.

Further, 21 is a 4-frequency signal generation circuit which will be described in detail later.
Four types of pilot signals related to four-frequency tracking control are output in parallel. These are mixers 22a, 22
b, 22c, 22d, '7 are mixed into the recording signals of each magnetic head.

Hereinafter, the head switching timing by the switching circuit 15 will be explained using FIG. 6.

During three-system recording, as shown in Figure 6(a), when the video signals Sig and I are manually input to the magnetic head R for recording, the magnetic head R When the magnetic head L' has advanced by 90 degrees, which is 1/3 of the range of 270 degrees, the magnetic head L' reaches the recording start point and starts recording the video signal Sig,2. Similarly, the video signals Sig, 3→Sig, 1→Sig, 2 are also recorded on one track in the order of R'→L−)R. FIG. 8 shows step A of recording on the magnetic tape at this time.

When a recording command is issued by an operation unit (not shown) in FIG. 1, the system controller 17 receives this command and controls the switching circuit 15 according to the timing chart shown in FIG. Further, the capstan 20 is rotated at a predetermined number of rotations, and the capstan drive circuit 23 is caused to run the magnetic tape 4 at a predetermined speed.

Next, the operation when sequentially reproducing video signals in three systems will be explained.

In this case, the magnetic head R traces the track in which the signals Sig and I are recorded, and then after obtaining one field of reproduced video signal, the magnetic head L, which rotates 90 degrees ahead of the magnetic head R, outputs the signals Sig and I. 2. Trace the recorded track. Then, tracing is performed in the order of R'→L'→R, Sig,], Sig,2. Sig, 3.
The fields are played back one field at a time in this order. Note that the running speed of the tape 4 at this time is 1/3 that of recording.

In FIG. 1, when sequential reproduction of three systems of video signals is ordered by an operation unit (not shown), the system controller 1
7 controls the switching circuit 16 according to the timing chart shown in FIG. 6(b), causes the capstan drive circuit 23 to rotate the capstan 20 at 1/3 the number of rotations during recording, and sets the running speed of the tape 4 to the speed at the time of recording. It is set at 1/3 of that. Further, the capstan drive circuit 23 uses a pilot signal included in the output signal of the switching circuit 16 to detect a tracking error by a known method, and performs tracking control accordingly. In this way, the switching circuit 16 outputs a video signal shot at high speed one field at a time, and after being returned to the form of a television signal in the reproduction signal processing circuit 18, a slow motion reproduction image is output. The signal is supplied to the output terminal 19 as a signal. Next, a specific example of the configuration of the aforementioned four-frequency signal generation circuit 21 will be explained using FIG. 1.

24 is a changeover switch that switches between 3-system recording and normal recording,
25 is a multiplier circuit that doubles the 45H2 rectangular wave signal (45PG) synchronized with the rotational phase of the rotating drum; 26 is the signal DATA from the changeover switch 24; and the signal from the multiplier circuit 25 is CLK. 27 is an oscillator, 28 to 31 are the oscillators 2
Divide the frequency of the signal generated by 7 and divide the signal by 0 with different frequencies.
The cut signals f,, f2. f3. A frequency divider circuit that generates f4,
Reference numerals 32 and 33 designate changeover switches serving as changeover means for changing over the pilot signals f2 and f3 in response to the changeover signal from the D flip-flop 26.

In the above configuration, if the "C" selector switch 14 is on the normal recording side (L), the DAT of the D flip-flop 16
Since a low level (L) signal is being supplied to A human power, no switching signal is output.

Therefore, the changeover switches 32 and 33 are connected to the L side. And pilot signals f, , f2 . f3 and f4 respectively connect magnetic heads R, L, and R' through 22a to 22d in FIG.
, L' is manually operated.

FIG. 3 is a diagram showing a timing chart of magnetic head switching, and FIG. 4 is a diagram showing a pattern of recording tracks recorded on a magnetic tape. In FIGS. 3 and 4, a, b, n.

o and p indicate signals recorded during normal recording, and c"-'m indicate signals recorded during high-speed recording.

Before the magnetic head L finishes recording, the selector switch 14
When switching from normal recording to high-speed recording by
A high level signal is manually input to the DATA terminal of the flip 26. Since the D flip-flop 26 does not change its output state until the next clock signal from the multiplier circuit 25 is input, a switching signal is transmitted to the changeover switches 32 and 33 at the rising edge of the next clock signal. . Along with this, the changeover switches 32 and 33 are switched from the normal recording side (L) to the 3-system recording side (H), and the pilot signal f2
and f4 are exchanged and supplied to heads L and L'. Accordingly, during three-system recording, 1/3 field after the magnetic head R' starts recording the pilot signal f3, the magnetic head L records the pilot signal f4, and then the magnetic head R records the pilot signal f1. , high-speed recording is performed.

Next, if you want to return the 3-system recording to normal recording, selector switch 2
Return 4 to the normal side (L). Now, as shown in FIG. 3, when the above switching is performed before the magnetic spatula F L finishes recording,
The D flip-flop 26 returns the output signal to the low level at the next clock and operates the changeover switches 32 and 33.

Now, if this switching operation of the switch 24 is performed while the magnetic head L is recording the pilot signal f4, since the recording track m has a recording residue of 1/3 field, after the recording of the recording track m is completed. , the changeover switches 22 and 23 are (
Switch from the H) side to the (L) side. Then, normal recording is resumed from recording track n.

According to the VTR configured as described above, whether three systems of video signals are recorded simultaneously or one system of video signals is recorded, four types of pilot signals are recorded in a predetermined arrangement using exactly the same circuit. This eliminates the need for a circuit that sequentially switches and outputs the types of pilot signals.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to perform four-frequency tracking control in a device that simultaneously records three systems of signals and records one system of signals with a simple circuit configuration. A rotary head type recording device capable of recording was obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main part configuration of a VTR as an embodiment of the present invention, FIG. 2 is a diagram showing a schematic configuration of the entire VTR as an embodiment of the present invention, and FIG. 3 is a diagram showing normal recording and 3. A timing chart showing the switching timing of the magnetic heads in both motes of system recording, Fig. 4 is a diagram showing the recording pattern on the magnetic tape according to this embodiment, Fig. 5 is a timing chart showing the recording signals of the three systems, Figures 6(a) and (b) show the switching circuit 1 in Figure 2.
FIG. 7 is a diagram showing the arrangement of the magnetic head, and FIG. 8 is a diagram showing the Dave trace on the magnetic tape in three-system time recording. In the figure, R, L, R', L' are rotating heads, 22a, 22, respectively.
The mixer 27 b, 22c, and 22d is an oscillator, 28.29, 30.31 is a frequency divider, and 32.33 is a changeover switch.

Claims (1)

[Claims] A device for recording signals by winding a tape-shaped recording medium over an angular range of 270° or more around a cylinder member having four heads that rotate with a phase difference of 90° from each other, and for tracking control. The configuration is such that four types of pilot signals for use with the four types of pilot signals are associated one-to-one with the four heads for recording these, and the four types of pilot signals are recorded by the corresponding heads, respectively. A rotation characterized in that the correspondence relationship is switched between a first mode in which recording is performed using one of the heads sequentially and a second mode in which recording is performed using three of the four heads simultaneously. Head type recording device.