JPS6117041B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording and reproducing apparatus particularly suitable for high-density recording.

The present invention relates to a new recording device that can produce an ultra-compact VTR capable of slow still playback with a simple configuration.

This invention primarily applies a new type of head and recording method to single head type VTRs. A single head is small and the amount of recording medium is smaller than before, contributing to miniaturization.

FIG. 1 shows one embodiment of the recording/reproducing head of the present invention. A is a plan view, and b is a side view, in which two heads 8 and 9 are lined up in a line on a head drum 6.

FIG. 2 shows an example of a pattern recorded by the head of FIG. The tape 1 is scanned in the order of 2, 3, 4, and 5 to produce tracks, but in the first scan 2, the video signal is gated to each head every 1H (line) to produce a zigzag track, as shown by . The second scan 3 is similarly constructed but gated to fill the first scan gap as shown in . The third scan is filled in in the same way, and the following steps are performed in the same manner to perform H sorting. Heads 8 and 9 in Figure 1
Provide appropriate gaps as necessary. The details of H alignment are described in Japanese Patent Publication No. 39-22002 proposed by the inventor. Reproduction of such a pattern is performed in all or one of the similar heads as will be described later, and it can be seen that by applying both line correlation and filter correlation, the amount of tape used can be halved compared to the conventional one. It can be seen that H alignment is also performed well.

FIG. 3 is a modification of the pattern shown in FIG. 2, and as shown in the figure, , , . . . are recorded in pairs.
Therefore, there are two recording heads in one as shown in Figure b.
Only the head 0 may be used. However, in this case, if there is a large difference in the order of adjacent lines, the resolution may drop slightly unless the procedure described below is done.

The head in FIG. 4 is a modification of the one in FIG. 1, with the two heads offset by nH. This is to correct the fact that when performing diagonal recording, even if H is lined up, the order of adjacent H is shifted by some points. It is preferable to select the head spacing so that the deviation between each scan of one head is the same.

FIG. 5 shows an example of a pattern produced by the head of FIG. For example, lines 15 and 16 correspond to the above-mentioned deviation and are shifted by nH (n is a positive integer), so that an accurate pattern can be obtained. It is preferable that n be set to the number of shifts in the next track when one head is scanned.

FIG. 6 schematically shows a pattern recording circuit as described above. The signal source 30 is gated as described above by the gate processor 33, which is controlled by the synchronizing signal separated by the multiplier/DC synchronization separation circuit 32 and the horizontal synchronization separation circuit 31, and sends the signal to the two heads 8 or 25 and 9 or 26. send. The output of the rotating head sensor 50 is also input to 33 if necessary.

FIG. 7 shows an example of a reproducing circuit for the recording pattern as described above.

The playback head output enters the gate 40 and is processed by the output of the head rotation sensor 50 and V, H.
The outputs generated every 1H by combining gate pulses and the like in the same manner as during recording are made continuous by a 1H delay 41, and the color decoder 43 generates an output 42. In this case, since every other line is used, the vertical resolution deteriorates.

Moreover, the pattern shown in FIG. 5, which is a constant combination of the outputs of two heads picked up sequentially, is used without gating the head outputs for each H, and the vertical resolution is as good as continuous recording. At this time, the reproduction circuit is simplified as shown in FIG.

FIG. 9 shows an example of recording according to the invention. The first scan 2 is a luminance signal created by filtering the luminance component from a well-known NTSC signal, FM, high-pass filtering, etc.
Y ₁ is input as shown in Figures 2, 3, 4, and 5, and then scan 3 interpolates the color signal C ₂ produced by the well-known color signal frequency reduction method of the next field as shown, and further scans the next field. Scan 4 repeats Y ₃ ... In the case of Fig. 5, the positions of Y and C are slightly different.

If playback is carried out in the circuit of Figure 8, i.e., without gated H, the signal will, for example, arise from Y ₁ +C ₂ or Y ₃ +C ₂ in scan 3, with good vertical resolution, and in the next scan 4, Y ₃ +C ₂ and Y The signal is generated from ₃ + C ₄ , and the vertical resolution is good, the color signal changes smoothly over time, and the continuity of motion is good. Slow and still playback is particularly good when the pattern is as shown in Figure 5, and the inventor's proposal to play back with only one of the two heads and switch this when the head crosses the track (Japanese Patent Publication No. 40-1026) You will feel better if you follow the following.

FIG. 10 is another example of the reproducing circuit of the pattern shown in FIG. 9. When a guard band is provided a little, each head output is separated from Y by a high-pass filter 53, and when each head is above C, A gate switch is performed at H cycles to connect to the band filter 54. The collar is preferably of the well-known reduced carrier wave type. This gate signal is generated from the H synchronization pulse processed by the rotating head sensor 50 in a circuit 60 or separated from the reproduction signal. The choice of color recording can be detected based on the component frequencies of the output. The output of 54 is processed by 55 and colored.
An NTSC signal is generated at 56. In this case, if the tracks are in perfect contact with each other, color signal interference may occur, so if this is prevented by a well-known inversion method, high-density recording can be performed without causing interference.

Furthermore, if the reproduction scanning is performed in the middle of the recording scanning for each head as shown by the dotted lines 10 and 11, it is not necessary to use the switch 52, but if the H alignment is insufficient, the horizontal resolution will drop slightly. By providing a slight guard band, the switch 52 can be omitted and only the filter separation is required.

FIG. 11 shows a side view a and a recording pattern b of another example of a rotary head according to the invention. Three heads 62, 63 and 64 are attached to the head drum at appropriate intervals as shown in FIG. 5, producing a pattern as shown in FIG. b.

For example, scanning 3 has the configuration shown in the figure, and color processing can also be performed according to FIG. 9. The tape is almost the same as the conventional tape.
You only need about 1/3 of the amount. In particular, color data can be input every 3H and made continuous with a delay, but this will have little effect, but for the Y signal, at least 2/3 should be generated from each line.

The present invention is based on the azimuth method proposed by the inventor
-23924) can be used to change the azimuth every 1H and gate the adjacent H to have a different azimuth. In this case, the H gate at the head can be omitted, but in the case of the pattern shown in Figure 3, it is made continuous with a 1H delay, and in the pattern shown in Figures 2 and 9, the well-known period inversion is performed without a guard band using a frequency filter. Interference can be prevented by law. In addition, to reproduce the pattern as shown in Figure 3a, 3 as shown in Figure 12 is used.
Using heads 70, 71, 72, scan 3,
In cases like , use 70, 71, in cases like , use 72, 71, and set the interval between 70 and 72 to H.
It is best to choose according to the difference in ranking. Therefore, this head system can also be seen as a composite of the heads in FIGS. 1 and 4. A is a side view and b is a plan view. Also
They may be lined up in a line or shifted by one as in a', a''. a'' indicates the case of the azimuth method.

In the present invention, since there are H lines for the next scan every one to several lines, if you use this to control the horizontal synchronization section of the camera to create horizontal synchronization for the next scan, you can create an extremely good H line pattern. obtain.

Figure 13 shows this concept, 80 is a camera, 81
is a VTR. For example, in Figure 5, first scan 2 and 1
It is sufficient to create lines 6, 18, . . . and use these signals to provide a horizontal synchronization signal for the gap to the camera to regulate the next scanning line.

Generally speaking, the gist of the present invention is to arrange a plurality of rotary heads at appropriate intervals and, in principle, advance the recording medium sequentially by the width of one head to reduce the amount of media used through line and field correlation, and various modifications are possible. can. The reproduction method is not limited to the above, for example, only one of the two heads is used to reproduce color and Y by H delay.
The signal may be made continuous, and in this case, slow and still operations are performed smoothly by switching between the heads.

Further, for example, when two heads are in different horizontal ranks when reproducing a pattern as shown in FIG. 3, a delay corresponding to the difference in the ranks may be inserted to make them in the same rank and perform composite reproduction. This also applies to other examples.

FIG. 14 schematically illustrates this case and shows a switch 90 for connecting the required number of H delays to the required head so that the outputs 91 and 92 can be connected at all times.

The present invention is not limited to the above-mentioned specific example, and various modifications and combinations of embodiments can be made.

[Brief explanation of the drawing]

FIG. 1 shows an example of a rotary head according to the invention. 6...Head drum, 7...Rotation center, 8,9...2
FIG. 2 shows an example of a pattern recorded by the head of FIG. 1... Recording tape, 2, 3, 4, 5... Successive scanning, Figure 3a shows a modified pattern of Figure 2, and Figure b shows the head 20 used for this. FIG. 4 shows another example of a rotary head according to the invention. 25, 26...Two heads FIG. 5 shows an example of a recording pattern according to the present invention. 15, 16, 17, 18... Line recording of scan 2 FIG. 6 shows an example of a recording circuit according to the present invention. 30...Video signal, 31...Horizontal separation circuit, 32
...Vertical separation circuit, 33... Gate processing circuit, 50...
Rotating Head Sensor FIG. 7 shows another example of a recording circuit according to the invention. 50...Head rotation sensor, 40...1H delay, 4
1...1H delay, 43...color processor, 42...output signal FIG. 8 shows a modified circuit of FIG. 7. FIG. 9 shows an example of a recording pattern according to the present invention. 12, 11...Another reproduction scan trace FIG. 10 shows an example of a reproduction circuit for the pattern of FIG. 9. 60...processor, 52...changeover switch, 53...high-pass filter, 54...bandwidth filter, 55...processing circuit FIG. 11 shows another example of the rotary head according to the present invention. 62, 63, 64...Head FIG. 12 shows another example of the rotating head used in the present invention. Three heads 70, 71, 72... FIG. 13 schematically shows a photographing system according to the present invention. 80...TV camera, 81...VTR FIG. 14 schematically shows a reproducing circuit according to the present invention. 90...Gate, switch circuit, 91, 92...Output, 93...Delay.

Claims (1)

[Claims] 1 Record the first track every one or several lines of the video signal, fill in the empty lines in the next scan, and repeat the same process with a single head set approximately lined up. A recording device that has a head that composes one track in approximately one rotation of the head.