JPS61232783A - Magnetic picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a field still and slow of a respective systems by using combination heads for PAL and for NTSC one by one, or by adding a delay circuit to one of the combination heads. CONSTITUTION:During an ordinary picture recording and reproducing, signals from an R azimuth head 1a and an L azimuth head 1b are amplified, and changed over to output the signal. During a still time of an NTSC system, the R azimuth head 1a and an R azimuth head 1c are changed over at a HEAD1 jSW section to realize a field still. During a still time of a PAL.SECAM system, the L azimuth head 1b and an L azimuth head 1d are changed over at a HEAD1 kSW section to realize the field still. By using a cylinder having combination heads for the PAL system and for the NTSC system, the field still of many systems can be realized without adding a 90 deg. shifter circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a multi-system magnetic recording and reproducing apparatus that can be used to improve special playback functions.

As a special playback function of a conventional magnetic recording/playback device, there is a field still function that plays back still images without image blur. To achieve this, there are two methods: one is to use a still dedicated head separate from the normal recording/reproducing head, as shown in FIG. 6, and the other is to use a combination head, as shown in FIG.

In FIG. 5, R and L are azimuth heads, as are R azimuth heads for normal recording and reproduction. R' and R'' are still dedicated heads. These still dedicated heads have two heads with the same azimuth angle placed at the 1800° position so that they can reproduce the same field recorded on the magnetic tape. (In the figure, the R azimuth head is placed at a position rotated by 90 degrees with respect to the normal recording/reproducing head.)

The operation when this head is used will be explained using FIG. 4. First, in cases other than stills, signals are read by the R head and L head, amplified by an amplifier, and the amplified signal is cut off by a head switch signal to output a continuous video signal. In the case of stills, SWl is on the 5TILL side, and the signals read from heads R' and R'' are amplified.
It is switched and output by HKADSW. At this time, the head switch signal is shifted in phase by 90° by SW2 and passed through MM. This is because R'R' is at a position rotated by 90' with respect to RL.

Figure 7 shows a conventional example using a combination head.
is an L azimuth head and an R and L' combination head, of which R is an R azimuth head for normal recording and reproduction, and L/ is an L azimuth head exclusively for still use.

The operation when this head configuration is used will be explained using FIG. 6. In cases other than stills, signals read from the R head and L head are amplified and switched using a head switch signal to output a continuous video signal. For stills, L
The head and L' head are used to read tracks of the same L azimuth, amplify them, and perform switching to achieve field still.

Problems to be Solved by the Invention However, in the former configuration described above, in order to switch to a still-only head, a circuit (4k in FIG. 4) that shifts the phase of the R and L switching head switch signal by 9σ is required. Become.

In the latter case, since the combination heads used in PAL and NTSC are different, it is not possible to realize multi-system field still and throw with the same configuration as before.

In view of the above-mentioned problems, the present invention uses a combination head for FAI, one for NTSC, or a circuit that can achieve the same effect, and magnetic recording and playback that can realize field still and throw of each system. It provides equipment.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention uses one combination head for PAL and one for NTSC, or a delay circuit is provided in one of the combination heads. It is equipped with a configuration that includes the following.

Operation The present invention uses a combination head for PAL for still/throttle of PAL-8KCAM and a combination head for NTSC for still/throttle of NTSC with the above-described configuration, thereby shifting the head switch signal. This allows you to make multiple field still throws without having to do anything.

When using a delay circuit, use one of the combination heads and delay the signal read by the still head side of the other combination head to maintain signal continuity. This means that both types of field still throws can be made.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings. Figure 1 shows PAL, NT
FIG. 3 is an operational block diagram when one SGO combination head is used. FIG. 2 is a layout diagram of the combination head.

In Figure 1, 1a is the R azimuth head, 1b is the L azimuth head, 1G is the still head mass for N'rsc), and 1d is the sun still head azimuth for PAL.
, 10 to 1h are amplifiers, 11 is a head switching unit for normal playback, 1j is a head switching unit for NTSC still, 1 is a head switching unit for PAL still, and SWl is a switching SW for the head switching unit. be. Also, as shown in Figure 2, 1a
and 1d are combination heads for PAL, 1b and 1
C is a combination head for NTSC.

The operation of the magnetic recording/reproducing apparatus of this embodiment configured as described above will be explained.

First, during normal recording and playback, the R azimuth head of 1a and the
The signal from the L azimuth head of b is amplified and switched to output the signal. When using NTSCj method, 11
L R azimuth head and 10 R azimuth head 1j
Field still is realized by switching with the HEAD SW section. Also, when using the PAL-8 ICCAM method, field still is realized by switching between the 1b L azimuth head and the 166OL azimuth head 1 using the 0HICAD SW section.

As described above, according to this embodiment, by using a cylinder equipped with a combination head for PAL and NTSC, multi-system field still can be realized without adding a 90° shifter circuit.

FIG. 3 is an operational block diagram of the second embodiment of the present invention. 3& is R azimuth head, 3b is L azimuth head, 3G is still head (L azimuth), 3d to 3f
is an amplifier, 3g is a delay circuit, 3h is a head switching unit for 3a and 3b during normal playback, 31 is a head switching unit for 3b and 30 during still playback, SWl is a switch for switching the delay circuit, SW2 is for still and other modes. This is a switching SW. The arrangement of the heads is the same as in FIG. 7, and R at 31L and L' at 30 are combination heads.

The operation of the magnetic recording/reproducing apparatus of this embodiment configured as described above will be described below.

The operation in this case is almost the same as the latter conventional example. The difference is that when stilling a signal using a system different from the combination head used, the signal from the still dedicated head is passed through a delay circuit to maintain signal continuity.

By providing the delay circuit as described above, the conventional head configuration can be used as is, and a head compatible with a long-time mode can also be used.

Effects of the Invention As described above, according to the present invention, there is no need for a 90° shifter, and there is an effect that field still can be easily performed in multiple ways.

[Brief explanation of the drawing]

FIG. 1 is an operational block diagram of the first embodiment of the present invention;
The figure is a head arrangement diagram of the first embodiment, FIG. 3 is an operation block diagram of the second embodiment, and FIG. 4 is a head layout diagram of the second embodiment.
・PAI, combination head (1 (1 is for still), 1b
, 1c...N TSC combination head (1
C is for still), 10-1h...Amplifier, 11
...Head switching section during normal playback, 1 piece...
...Head switching unit for NTSC still mode, 31L
. 3G... Combi head (3C is for still), 3
d~3f...Amplifier (head amplifier), 3g・
...Delay circuit, 3h...Head switching unit during normal playback, 31...Head switching unit during still playback. Name of agent: Patent attorney Toshio Nakao and 1 other person
Ir1A Figure 2
θt-=MtMy>e-+, FxJrt, tn°]
Chiku3 diagram Ij84 diagram

Claims (1)

[Claims] 50 fields/sec, 625 fields per magnetic recording/playback device
H/frame system (PAL, SECAM system, etc.) and 6
0 fields/sec, 525H/frame system (NTSC
This is a magnetic recording and reproducing device that can record and play back video signals of both television systems (such as TV systems, etc.), which has a cylinder equipped with two gaps in one head chip and combination heads for two systems with different gap positions depending on the system. 1. A magnetic recording and reproducing apparatus characterized by having a cylinder having a combination head of one type and another head, and using a delay circuit during stilling of the other type.