JPH0271688A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To record a video and audio signals with a guard band less method without increasing the tracking accuracy by employing 4-channel magnetic heads in which four heads having 2 kinds of azimuth angles are arranged in the track width direction. CONSTITUTION:The magnetic heads 1, 3 are used for a video signal, the gap width is 50mum, the magnetic heads 2, 4 are used for an audio signal and the gap width is 50mum. An azimuth angle is given to the gap for the audio signal with respect to the gap for the video signal and the angle is selected so that the crosstalk with the signal of the adjacent region is negligibly small. Through the constitution above, without improving the tracking accuracy, only as to the video signal, a similar recording pattern to a recording pattern with the provision of a guard band is obtained and the video signal is reproduced by using two heads whose azimuth angle is identical in the track width.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording device, and particularly to a device for recording video and audio signals on a rotating magnetic recording medium.

[Prior Art] Conventionally, in the unified standard for still video (hereinafter referred to as Sv), as shown in FIG. , ~20 degrees is defined as a recording/reproducing area, and this area is divided into 50 equal parts in the radial direction, and 50 concentric tracks are recorded from outside to inside at a pitch of 0.11. This 0.1. Conventionally, as shown in FIG. 5, both ends 20 of the width of o, i, and
Tracks were formed with a width of 60 g at the center, leaving a width of 1.2 am, and a video signal for one field was recorded on each track. Here, the regions 20- at both ends are so-called guard bands that prevent crosstalk of signals from adjacent tracks. Conventionally, when recording video signals for two fields, ie, one frame, using two tracks, a magnetic head as shown in FIG. 6 has been used. As shown in the figure, two operating gaps 601 are arranged side by side with an interval of 40g, and these 40)t,
The spacing forms a guard band.

In such a configuration, it has recently been considered to record audio signals and the like on guard bands of 20 g each at both ends to make the device guard bandless.

The recording pattern is shown in Figure 7. Recording is performed in the conventional guard band area at an azimuth angle different from that in the video signal recording area to prevent crosstalk between the video signal and audio signal. That's what I do.

[Problem to be solved by the invention]

However, in the case of the conventional guard panless recording described above, the magnetic head has a 3-channel magnetic head configuration when recording a video signal for 1 field, and a 6-channel magnetic head when recording a video signal for 1 frame. is required, and both ends are 20! Since the recording width is , the tracking accuracy must be made even higher. Although it is possible to improve tracking accuracy to some extent, manufacturing a 6-channel video is technically difficult and expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording device capable of recording still image signals, audio signals, etc. in an inclined azimuth manner using a magnetic head having a simple configuration.

[Means for Solving the Problem] In order to achieve the above object, in the present invention, four magnetic heads having a first azimuth angle and four magnetic heads having a second azimuth angle are arranged alternately in the track width direction. A first field and a second field of a video signal for one frame are respectively recorded by the two magnetic heads having the first azimuth angle, and the second azimuth angle is adjusted using four-channel magnetic heads arranged in an array. The configuration is such that audio signals are recorded using two magnetic heads.

[Function] By adopting the above configuration, it is possible to record video signals and audio signals on a rotating magnetic recording medium without increasing the tracking accuracy, and when considering only the video signal, it is possible to record video signals and audio signals without increasing the guard punt. You can use the same recording format as when recording with .

[Example] The configuration of a 4-channel magnetic head according to the present invention is described in the first example.
As shown in the figure. In the same figure, 1.3 is 5O1 for video signal.
A magnetic head having a gap width of t, 2.4 is a magnetic head having a gap width of 501 for signals such as audio, 5
is a winding. FIG. 2 is a plan view of the magnetic head of the present invention viewed from above, and as shown in the figure, the gaps for recording signals such as audio among the four channels are the gaps for recording video signals. An azimuth angle is attached to the gap. This azimuth angle is set to such an angle that crosstalk with signals recorded on adjacent bonds can be ignored. The signal recording pattern of a 4-channel magnetic head with such a configuration is as shown in Figure 3.The L track is not divided into 20μm 601L+S+20gm parts as in the past, but it is divided into 2 SOBs for video signals, 2 SOBs for audio signals, etc. 50t for signal
t and so on, and signals such as audio are recorded in tilt azimuth. If you do it like this.

■The head for recording video signals for frames only needs 4 channels, and the recording width is 50g, which is almost the same as the conventional 60#L recording width, and the tracking means can be used as is. There is no problem. Further, even for recordings recorded with the conventional guard hunt, since the distance from the center of one gap to the center of another gap is the same as in the conventional case, it can be reproduced in the same way. Conversely, when a conventional magnetic head is used to reproduce guard pantless recording as in the present invention, a gap of 5 hours protrudes into the area where audio and other signals are recorded, but these signals are not azimuthally recorded. Therefore, a reproduced signal of only the video signal is obtained without being reproduced.

[Effects of the Invention] As explained above, by using a 4-channel magnetic head in which four heads having two different azimuth angles are arranged in the track width direction, video recording can be performed without increasing tracking accuracy. Only the signal can be recorded in a recording pattern similar to that provided with a guard band, and the video signal can also be played back using a two-channel magnetic head with two heads with the same azimuth angle arranged in the track width direction. It is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a 4-channel magnetic head in this invention, FIG. 2 is a plan view of a 4-channel magnetic head in this invention, FIG. 3 is a diagram showing a recording pattern of guard pantress recording in this invention, and FIG. The figure shows the recording area according to the Sv unified standard, Figure 5 shows the recording pattern with a conventional guard band, Figure 6 shows the configuration of a conventional recording magnetic head, and Figure 7 shows the conventional guard band. FIG. 3 is a diagram showing a recording pattern of address recording. In the figure. l, 3: Magnetic head for video signal 2.4: Magnetic head for audio signal 5: Winding

Claims (1)

[Claims] A four-channel magnetic head in which four magnetic heads having a first azimuth angle and four magnetic heads having a second azimuth angle are arranged alternately in the track width direction is used to produce a first azimuth angle on a rotating magnetic recording medium. The first and second fields of the video signal for one frame are recorded on each of two concentric tracks recorded at the corners, and the second
A magnetic recording device characterized in that audio signals are recorded on two concentric tracks recorded at an azimuth angle of .