JPS6249794A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To decrease the number of guard bands and to record with high density by so disposing tracks that correlative signals are provided adjacently with each other, and recording by inclined azymuth recording. CONSTITUTION:On a tape 1, tracks are arrayed in a sequence: Y, C, C, Y, Y, C,.... Between the bands Y and C, there is a guard band. Adjacently provided tracks C and C and those Y and Y are closely abutted each other but respectively have different azymuth angles. Heads A2 and B2 are at the same height as that of A1 and B1, but the formed track is provided adjacently to the one formed by the A1 and B1, since the tape proceeds by 1-track pitch while the cylinder rotates 180 deg.. By constituting the head in such a way, the track sequence is made: Y, C, C, Y, Y, C,... and hence the track pattern shown in the figure can be formed. Accordingly, the guard bands between the neighboring Y-tracks and C-track can be removed, and the recording of high density is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a video signal recording and reproducing device.

2. Description of the Related Art In a conventional video signal recording and reproducing apparatus, as shown in FIG.
It was common to record on tracks arranged in the order of C, Y, C.

The FM luminance signal Y is an FM modulated luminance signal, and the FM chrominance signal C is an FM modulated version of two color difference signals that are time-base compression multiplexed, or two color difference signals each with different carrier frequencies. This is a mixture of FM-modulated signals, so-called frequency multiplexed signals, or a so-called line-sequential color-difference signal, in which two color-difference signals are alternately selected every horizontal period, is FM-modulated.

For example, JP-A-59-4279, JP-A-59-34
This method is disclosed in Japanese Patent Application Laid-open No. 785, Japanese Patent Application Laid-open No. 59-104886, and Japanese Patent Application Laid-Open No. 59-104887.

Problems to be Solved by the Invention In the conventional video signal recording and reproducing apparatus, there is a section between the Y track and the C track where nothing is recorded so that the FM luminance signal Y and the FM color signal C do not interfere with each other. A certain guard band must be put in place. For this reason, the tracks could not be arranged closely together, and the recording density could not be increased much.

Inclined azimuth recording has been known as a method of increasing recording density. This is a recording method in which the gaps between rotating heads for adjacent tracks are tilted differently, the guard band is removed, and the tracks are recorded in close contact with each other. According to this method, the cocoon stalk component from the adjacent track is attenuated by the azimuth loss, so the track
It doesn't matter if the 7ri are close together.

However, this method cannot be expected to be very effective unless there is some degree of correlation with adjacent tracks. If there is crosstalk in the FM wave, the interference component that appears in the demodulated signal is based on the principle of triangular noise.The crosstalk of frequency components close to the carrier becomes smaller after demodulation, but increases in proportion to the distance from the carrier. This is because it becomes a big hindrance.

Therefore, in cases where there is no correlation at all, such as a luminance signal and a color difference signal, the frequency difference between the carrier and crosstalk is large, so a large interference component appears, and it is not very effective.

The present invention has been made in view of the above-mentioned problems, and by arranging tracks so that correlated signals are adjacent to each other and performing inclined azimuth recording, guard bands can be reduced and high-density recording can be achieved. In order to solve the above problem, the head is arranged so that the tracks are arranged in the order of Y, C, C, Y, Y, C, and a guard band is opened between Y and C, but between adjacent Y and Y and The heads that record C and C traverse and 7 have different azimuth angles, and by bringing the tracks close together and eliminating the guard band, oblique azimuth recording is performed.In this way, Y and Y and C and C If the tracks are placed next to each other and the tape feed amount is set appropriately so that they are lined up in H as in the past, the signals recorded on closely spaced tracks will have a correlation with each other, so that tilt azimuth recording will be possible. It can be done effectively.

Effect of the present invention With the above-described configuration, since correlated signals are adjacent to each other, inclined azimuth recording can be performed effectively, guard bands can be eliminated, and high-density recording can be performed. By using a tape and recording with the same track width, it is possible to record for a longer time, and with the same recording time, the track width can be wider, improving the S/N ratio.

Example FIG. 1 shows a track pattern of one embodiment of the present invention.

y, c, c, y, y, c... on tape 1
The trucks are lined up in the order of..., Y, l! : There is a guard band between the C tracks, and adjacent C and C and Y and Y
The tracks are closely spaced and have different azimuth angles.

FIG. 2 is a configuration diagram showing an example of a rotary head for realizing the track pattern of FIG. 1. FIG. 2(a) shows a case where the tape 1 is fed in the direction of the arrow and the cylinder rotates in the direction of 2. Also, the head for recording the two signals Y and C is AI.

B1 and A2. The case of two sets of B2 is shown.

Figure 2 (bl shows the relationship between the heights of the above two sets of heads. The heads of A1 and B1 are separated by the width of the guard band, and the lower end of A1 and the upper end of 81 are at a height equal to the trace pitch P. A2 and B2 are installed at positions where A1 and B1 are rotated by 180 degrees.The trace pitch P is determined by the trace pitch P as the tape is fed. Refers to the amount by which the position shifts.

FIG. 3 shows the relationship between tracks and heads.

Figure 3 (al is in the case of Figure 2, Y in A1 and B2,
It shows the relationship when C is recorded in B1 and A2. A2. B2 is A1. Although it is at the same height as Bl, when the cylinder rotates 180 degrees, the tape advances by one trace pitch during that time, so the track to be formed will be next to the track formed by At and Bl. When the head is configured in this way, the tracks are Y, C, C, Y, Y, C.
..., and the track pattern shown in FIG. 1 can be formed.

In addition, the track pattern shown in FIG. 1 can be similarly formed using head configurations such as those shown in FIG. 3) to (h).

FIG. 4 is a diagram showing the details of the pattern shown in FIG. 1, and shows an H arrangement.

Although FIGS. 1 and 4 show the case where the azimuth angles of adjacent Y and C are different, it goes without saying that they may have the same azimuth angle since there is a guard band.

Further, the head widths shown in FIGS. 2 and 3 indicate the effective head width, and it goes without saying that if the head width is wider than this and overlapping recording is performed, resulting in the track pattern shown in FIG. 1, that is sufficient.

Effects of the Invention As described above, according to the present invention, the truck can be
, c, c, y, y, c, guard bands between adjacent Y and Y and C and C tracks are no longer required, allowing for high-density recording and longer or higher S/ N ratio can be obtained, which is extremely useful.

With the above-described configuration, the present invention can eliminate guard bands between adjacent Y troughs 2 and between adjacent C tracks,
High-density recording is possible. Therefore, if you use a tape with the same length and width and record with the same track width, you can record for a longer time, and if the recording time is the same, you can use a wider track width and the S/N ratio will be lower. Improved.

[Brief explanation of the drawing]

Fig. 1 is a track pattern diagram of an embodiment of the present invention, Fig. 2 is a configuration diagram showing an example of a rotary head for realizing the track pattern of Fig. 1, and Fig. 3 is a track pattern diagram of an embodiment of the present invention. FIG. 4 is a detailed track pattern diagram of an embodiment of the present invention, and FIG. 5 is a conventional track pattern diagram. 1... Tape, Al, Bl... Head. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 2 Figure 3 Figure 3

Claims (5)

[Claims] (1) It is equipped with one or more sets of two rotary heads that record two signals A and B, respectively, and the track a where the signal A is recorded and the track b where the signal B is recorded are arranged in such a manner that the tracks a, A video signal recording and reproducing device in which the rotating head is arranged in the order of track b, track b, track a, track a, and track b. (2) A guard band is provided between track a and track b, and rotating heads are arranged so that adjacent tracks a and track a and track b and track b are in close contact with each other,
2. The video signal recording and reproducing apparatus according to claim 1, wherein the rotary head has different azimuth angles between tracks a and b and between tracks b and b. (3) One of the two signals A and B is a luminance signal subjected to FM modulation, and the other is two color difference signals subjected to time axis compression and FM modulation. Claim (1) The video signal recording and reproducing device as described in . (4) One of the two signals A and B is a luminance signal that is FM modulated, and the other is a mixture of two color difference signals that are FM modulated at different carrier frequencies. The video signal recording and reproducing device described in (1). (5) One of the two signals A and B is a luminance signal that is FM-modulated, and the other is two color-difference signals that are FM-modulated alternately every horizontal period. (
1) The video signal recording and reproducing device described in item 1).