JPH0363901A - Magnetic picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce signals in various signal forms including a standard television signal by one device by forming a recording pattern corresponding to the plural signal forms by a rotary drum at the same lead angle. CONSTITUTION:Input video signals a1 and a2 are selected by an operation input part 30 and a select signal SH is outputted from a controller 29, discriminated automatically or by a changeover switch 26 and selectively switched. Corresponding to the kind of the signal, a drum servo circuit 8 and a capstan servo circuit 10 are switched so as to obtain the rotation of a rotary drum 5 and the velocity of a magnetic tape suitable for a recording signal band. The combination of heads 1,..., 4 loaded on the same drum 5 is changed so as to obtain the desired number azimuth angle and pattern width of the recording pattern and the desired number of tracks to be formed in one field period. Thus, the recording pattern, which is recorded by a standard recording pattern in advance, can be compatibly reproduced and the video signals in the various signal forms can be recorded and reproduced by one device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording and reproducing apparatus capable of selectively recording input video signals of a plurality of signal formats.

[Conventional technology]

Rotating head helical scan video tape recorders (abbreviated as VTRs), which are household magnetic recording and playback devices, were previously conceived based on the NTSC system (PAL and SECAM systems in Europe), which is the standard television signal format. . However, in recent years, an improved version of the standard television signal format, EDTV (Extended Definition
In addition to the commercialization of the HDTV (High Definition) television system, which is a higher-quality, high-definition (also called high-definition) television system,
The development and practical application of TV) systems are progressing. This H
Regarding the DTV system and HDTV-VTR, see the Journal of the Television Society Vol.

42, No. 7 (1988), pp655-658r
As stated in "Special Feature, Television Annual Report, 4-2, HDTV (High Vision)", the analog recording system,
There are VTRs of various types such as digital recording type. Specific examples of analog and digital high-quality VTRs are listed in the Television Society Technical Report PP0E56-2, pp'7-11 (published on November 28, 1984) for the former, and for the latter. is the Journal of the Television Society V
o1.42. No. 4 (1988), pp33
13-pp346 r Special feature, Recent magnetic and optical recording technology, 5. 1 and Digital VTRJ, respectively. These various high-definition VTRs are all magnetic recording and reproducing devices dedicated to high-definition television signals.

[Problem to be solved by the invention]

That is, the above-mentioned conventional VTR does not take into account the recording and reproducing of anything other than high-definition television signals, and does not have the conventional standard television signal recording and reproducing function, which is particularly desired in home VTRs.

Furthermore, the EDTV system, which is a better version of the standard TV system, is currently being put into practical use, and home VTR
However, it is inconvenient to prepare VTRs compatible with each television system in terms of both cost and space.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing device that is capable of recording and reproducing signals of a plurality of television signal formats, including the reproduction or recording and reproducing of conventional standard television signals, with a single device.

[Means to solve the problem]

The above purpose is to provide one rotating drum having a lead angle that forms the inclination angle of the recording pattern in the current standard recording mode such as the NTSC system, and one or more drum rotational speeds corresponding to one or more high-definition signal formats.

Change the magnetic tape running speed, the combination of multiple heads,
This is achieved by providing means for forming M recording tracks in one field period in high quality mode and forming recording patterns corresponding to a plurality of signal formats using a rotating drum having the same lead angle.

[Effect]

The type of the input video signal is determined manually or automatically, and depending on the type, the drum servo circuit and capstan servo circuit are set so that the rotating drum rotation speed and magnetic tape speed are appropriate for the signal band to be recorded. Switch. Further, the combination of a plurality of heads mounted on the same drum is changed so that the azimuth angle of the recording pattern, the pattern width, and the number of tracks formed in one field period become desired.

As described above, recording patterns recorded in advance in the standard recording mode can be easily and interchangeably reproduced, and video signals of various signal formats such as HDTV systems can be recorded and reproduced with one magnetic recording and reproducing device having one rotating drum. It becomes possible.

[Embodiment] Hereinafter, an embodiment of a magnetic recording/reproducing apparatus according to the present invention will be described using the block diagram of FIG.

In FIG. 1, 1.2.3.4 is a rotating head for recording and reproducing video signals mounted on a rotating drum 5, 6 is a magnetic tape, 7 is a drum motor, 8 is a drum servo circuit,
9 is a capstan motor, IO is a capstan servo circuit, 11.18 is a frequency discriminator, and 12 is a reference signal generator (S) for standard television signal format (NTSC system).
13 is a reference signal generator for high-definition television signal format (denoted as HD), 14.15.21.32 is a changeover switch, 16 and 22 are phase comparators, 17.23 is an adder, 19.20.31 is a frequency divider, 24 is a drum tack head for detecting the rotation and phase of the rotary head, 2
5 is a control (noted as CTL) head for reproducing control signals for tracking, 26 is a switch for switching between standard TV signal a1 and high-definition TV signal a2, and 27 is a magnetic tape for input signals of a□ and a2. 6
A recording signal processing circuit (
(including both analog recording and digital recording),
28 is a reproduction processing circuit that performs processing such as demodulation on the signal obtained from the rotary head; 29 is an operation input unit 30 (I
(including switching between semi- and high-quality modes)
The controller mainly performs system control of the TR, and is composed of a microcomputer with a built-in control program (it may also be composed of random logic).

Of the heads, 1.3 is +α azimuth angle, 2°4 is -
The head has an azimuth angle of α and a head width approximately 1/2 the pitch TP of recording tracks formed on the magnetic tape in a mode for recording standard television signals (standard mode).

FIG. 4 shows a recording pattern 401 recorded on the magnetic tape 6 by another VTR dedicated to the standard mode (for example, VH8 system).
．． 402..., the inclination angle θS of the recording pattern is 5'58'9.9' in the case of the VH8 system, the azimuth angle α is 6°, and one recording track is recorded in the l field period. It is formed.

FIG. 5 shows the rotary drum 5 of FIGS. 2 and 3 (in the magnetic recording/reproducing apparatus of FIG. 1, the lead angle is set such that the inclination angle of the weak recording pattern in the standard recording mode becomes θS of FIG. 4). recording patterns 501, 502, 503, 504, formed in high quality recording mode using
It is a diagram showing...

In FIG. 6, the combination of multiple (four) heads on the rotating drum 5 is changed from the high quality mode.

5 is a diagram showing a head trajectory when the standard recording pattern shown in FIG. 4 is reproduced in a standard mode. FIG.

Next, the operation of an embodiment of the present invention will be explained using the block diagram of the robot, the rotating drum diagrams in Figures 2 and 3, and the pattern diagrams in Figures 4, 5, and 6@. .

First, the operation in high quality recording mode will be explained.

Input video signals a (standard NTSC signal) and a2 (high-quality signals, here in MUSE format) are input to the operation input section 30.
The selection signal SH is output from the controller and selectively switched by the selector switch 26 (it may be automatically determined and switched depending on the type of signal). In Fig. 1, the standard signal (STD) is selected. The figure shows the case where Here, since it is high quality recording mode, SH is
At L It, the switch 26 falls down and switches each part to the high quality mode.

In the recording mode, the controller sends the recording/playback signal R.
P is output as "H" to switch each section. RP is it
By becoming H##, the switches of each part (tS, 21
) will fall upward.

Since high-bandwidth recording is required in high-quality mode, drum servo circuit 8. The capstan servo circuit IO is switched by the signal SH, and the drum rotation speed and tape running speed (corresponding to the capstan rotation speed) are both changed to twice the speed of the standard recording mode (SH is "H"). Also, the rotating drum 5
The combination of four heads mounted above is used so that the recording pattern is as shown in FIG. In other words, head 1 and head 2 (azimuth is opposite) write 2 channels at the same time.
(multi-track recording), then head 3 and 4.
, record one field, and repeat this, that is, head L is 501 degrees, head 2 is 502 degrees.
, 503 on head 3. The head 4 forms 504 recording tracks 7.

In other words, in one field period, one recording track is formed in standard mode, but in high quality mode, M (
In this example, 4 pieces) are formed. At this time, the inclination angle θu(H
D mode) is the same as θs (STD mode) because both the drum rotation speed and the tape running speed are twice as high.

The operation for doubling the drum rotation speed will be described below. In the drum servo circuit 8 shown in FIG.
A speed control loop is applied in which the output is fed back to the drum motor through an adder 17 to keep the DFG constant. By changing a reference signal (not shown) for this discrimination using SH, the drum rotation speed is changed to twice that in the standard mode. On the other hand, regarding the phase control loop, it is controlled by the phase comparator 16 so that the phase of the vertical synchronization signal ■ in the input signal and the drum tack signal match, and it is a high quality mode (■ is 60
Hz) Rotates at 3600 r, p, m.

In the standard mode, V (V is 59.94 Hz) is divided by 1/2 by the frequency divider 31, and then compared with the DTP, the frequency is rotated at 1798 r, p, and m.

Next, the operation for doubling the tape running speed will be described below. In the capstan servo circuit 10, a signal CFG representing the rotational speed of the capstan 9 is input to a frequency discriminator 18, and its output is fed back to the capstan motor through an adder 23, so that a speed control loop is established to keep CFG constant. ing. By changing a reference signal (not shown) for this discrimination using SH, the capstan rotational speed (ie, tape running speed) is changed to twice that in the standard mode. On the other hand, regarding the phase control loop, since it is during recording, a signal obtained by dividing CFG by 20 and a signal obtained by dividing the output REF of reference signal generation i (for HD, 60 Hz here) by 19 (if not divided) phase comparator 22 so that the phase matches that of
Control is applied.

In the standard mode, the output of the reference signal generator (for STD, here 29.97 Hz) is used as the reference for the phase comparator 22.

Next, the operation in playback mode will be explained. When reproducing the recording pattern in the high quality mode shown in Fig. 5, the signal is changed from the controller to It L II, and in the drum servo circuit 8, the operation of the speed control loop is the same as during recording, with only one phase control loop. .

It operates so that the phases of the DTP and REF, which is the output of the reference signal generator (for HD, 60 Hz), match, and the rotating drum 5 rotates at twice the speed of the standard mode. - In the capstan servo circuit, a signal obtained by dividing CFG by 20 and a control signal CT recorded for tracking
The tape 6 is operated at twice the speed of the standard mode.

Next, by using the rotary heads 1 and 4 in Figures 2 and 3 in combination, the JIA
i? ! The following describes how modes can be played back. 401, 402, . . . in FIG. 6 are recording patterns recorded in advance in the standard mode. In the drawing, when the standard mode and the reproduction mode are commanded from the operation input 30, the controller changes the mode of each part by setting SH to 'H' and RP to 'L II'. As a result, as mentioned above, the running speed of the rotating drum 5 and tape 6 becomes the standard mode (Ii), and the reproduction signal processing circuit 28 is also switched to the standard mode.The heads 1 and 4 are also selected, as shown in FIG. Then, track 401 is played back with head L having an azimuth angle of +α, and track 402 is played back with head 4 having an azimuth angle of -α, and this process is repeated thereafter, so that a standard mode recording tape can be played back interchangeably with one VTR. I can do it.

Even in standard mode recording, by recording with this combination of heads, only half of the track pitch is recorded, but it is also possible to provide a recording function.

The above shows that the speed of the rotating drum 5 and tape 6 is 2 in the standard mode.
Although we have explained the case where the rotation speed of the rotating drum is m times that of the standard mode, and the tape running speed is n times that of the standard mode.
The inclination angle of the recording pattern in the double case will be explained below. FIG. 7 shows the scanning locus of the head in this case. 701 is the head trajectory in the still (tape stationary) state, 702 is the standard mode (m = n = 1) state, and 703 is the head trajectory in the high quality mode (m times, n times), and the operating angle of the recording pattern is θ. . , θ3, θ□.

Assuming that one field period is V3, the tape running speed in standard mode is V6, and the drum diameter is D, the distance traveled by the head during the still period of v3 (not necessarily one track length) is = m・πD /2・・・・・・・・・
・・・・・・・・・・・・・・・・・・(1) When this a is used, the following is obtained, and θH becomes a function of n/m. The aforementioned m=
2, the tilt angle in the case of n=2 is equal to t (vg is slightly different) in 03 in the standard mode.

Next, as a second example, in FIGS. 2 and 3, the azimuth angle of heads 1 and 2 is +α, and the azimuth angle of heads 3 and 4 is -
An example where α is used will be explained. A recording pattern diagram recorded in high quality mode with this head configuration is shown in Figure 8.
Heads 1 and 2 form patterns 801 and 802, and heads 3 and 4 form patterns 803 and 804. In this case, compared to the case in Figure 5, 801 and 8
Since the azimuth angles between 02 and 803 and 804 are the same, there is a disadvantage in adjacent crosstalk. However, in the standard mode, as shown in the pattern diagram in Figure 9, by regarding heads 1 and 2 as one head and heads 3 and 4 as one head, a complete VH8 recording pattern can be created. It has the advantage of being able to be configured. The same applies to the playback mode. That is,
In the reproduction mode, a prerecorded pattern 901 is traced by heads 1 and 2 at 903 and 904, and a recorded pattern 902 is traced by heads 3 and 4 at 905 and 906.

Next, as a third embodiment, according to the head configuration of the second embodiment, high-speed duplication of tape recorded in high quality mode and standard mode is possible. ! ! (Also referred to as dubbing) will be explained using the pattern diagram in FIG. 10. When the duplication mode is commanded, in FIG.
2) Change each part so that it becomes 2). This state is equivalent to the high quality mode. By using two devices shown in FIG. 1, the first device can record the patterns 1001 and 1002 in FIG.
and 4, and the second unit plays heads and 2, and heads 3 and 4.
By performing a recording operation on a set of , it is possible to perform duplication in 1/2 of the normal time. At this time, the processing circuit 27. Although it is necessary to change the playback signal processing circuit, the circuit for high-quality mode (especially for analog recording) has sufficient performance for duplication because it is designed to support high bandwidth (411 standard). A mode-only device with only a rotating drum rotation speed of 2
Even if the bandwidth is doubled, the bandwidth cannot be doubled), but if the bandwidth is sufficient, it can be replicated not only twice but N times (m=N, n=N).

Next, as an example shown in FIG. 4, an example in which crosstalk between adjacent tracks can be reduced in the high quality mode and a complete VH3 recording pattern can be formed in the standard mode is shown in the top view of the rotating drum 5' in FIG. 11. This will be explained using the front view of FIG. 12. Heads 1', 2', 3' and 4' are the same as those described in FIG. 5, and are used for the high quality mode.

Heads 1101 and 1102 are for standard mode, the azimuth angle is +α for 1101, -α for 1102, and the head width is 11
01.1102 Both VH8 system track pitch T
It is assumed to be approximately the same as p.

By combining the above heads, we can simultaneously satisfy low crosstalk and perfect VH5 pattern formation.Next, as a fifth example, the above was a case of θI ("Fθ,").
The case where θ and 01 are different will be explained using the pattern diagram of FIG. 13. #R The VH8 system, which is one of the quasi-recording mode standards, has already been established, but various high-quality recording mode standards are still being considered, and it is not necessary that θa and θ necessarily match, or they may not match. As an example, an example will be described in which the recording track width is halved in the high quality mode to enable long-time recording (here, twice as long). For example, the first
Regarding the heads on the rotating drum shown in Figures 1 and 12, the head widths of heads 1', 2', 3', and 4' are set to 1/2 of the previous explanation (1/4 of TP). The drum rotation speed is twice that of the standard mode (m = 2), and the tape running speed is the same as that of the standard mode (n = 1).The recording track at this time is 1103° 1104... (Head 1'
1103 and 1104 are simultaneously formed by head 2'), the inclination angle 08' of the recording pattern in this case is 5 from equation (3).
'57'9'.

It is different from θ. In this example, the same recording time as in the standard mode can be secured even in the high quality mode. In addition to those described above, various combinations of heads, drum rotational speeds, and tape running speeds are possible.

〔Effect of the invention〕

As described above, according to the present invention, one device having the same rotating drum can record and reproduce television signals in multiple formats, including reproduction or recording and reproduction of magnetic tapes conventionally recorded in standard mode. be able to. Another advantage is that magnetic tape recorded in the standard mode can be dubbed at high speed with a minimum amount of hardware by effectively utilizing the recording/reproducing means in the high-quality mode.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are outline diagrams of a rotating drum according to the present invention, and FIG. 4 is a diagram of a pattern recorded in standard mode.
Figures 5 and 6 are pattern diagrams for high-quality mode and m-quasi mode, respectively; Figure 7 is a diagram for explaining the tilt angle; Figures 8 and 9 are patterns for explaining the second embodiment. Figure, 1st
Figure O is a pattern diagram for explaining the embodiment shown in Figure 3, Figures 11 and 12 are outline drawings of the drum for explaining the fourth embodiment, and Figure 13 is a diagram for explaining the fifth embodiment. It is a pattern diagram for explanation. 1.2.3, 4...head, 5...rotating drum, 8
...Drum servo circuit, 10...Capstan servo circuit, 29...Controller. 2nd Distribution 3rd ■ 5th + Figure 5 ■ ζ← Z

Claims (1)

[Claims] 1. Selectively recording input video signals in a standard signal format (NTSC, PAL, or SECAM) and one or more other high-definition signal formats on the same cassette or on multiple types of cassettes. In a possible rotary head helical scan magnetic recording and reproducing device, one rotary drum (5) having a lead angle forming the inclination angle of the recording pattern at least in the standard recording mode.
and means (8) for forming M recording tracks in one field period in a high-definition mode by changing the drum rotation speed and magnetic tape running speed in response to one or more high-definition signal formats;
, 10). A magnetic recording and reproducing device characterized in that it creates recording patterns corresponding to a plurality of signal formats including a standard signal format using a rotating drum having the same lead angle. 2. Means having a mode in which the drum rotation speed and the campstan rotation speed for running the magnetic tape are rotated at N times the standard recording mode, and reproducing the magnetic tape recorded on the standard tape in the N times speed rotation state. (8, 10, 28) or means (8, 10, 27) for recording the input video signal on the magnetic tape in the N-times speed rotation state, or both. Device. 3. As a combination of the drum rotation speed and magnetic tape running speed corresponding to the plurality of signal formats, a mode in which at least the drum rotation speed and the capstan rotation speed for running the magnetic tape are both rotated at N times speed; The magnetic recording and reproducing apparatus according to claim 1 or claim 2, comprising: 4. The magnetic device according to claim 1, 2 or 3, further comprising means (27, 28, 29) for mounting a plurality of heads on the rotating drum and changing the combination of these heads according to recording and reproduction modes. Recording and playback device.