JPH04206013A - Magnetic recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To obtain a slow regenerative picture, from which noises are not generated without an exclusive head and which has high picture quality, by intermittently driving a tape for a time corresponding to one track at every one intermittent operation, successively storing a regenerative signal regenerated when the tape is stopped at every intermittent operation in a memory and reading field information from stored information. CONSTITUTION:A magnetic recording reproducer has a rotating cylinder, magnetic heads 1-6, a head switch circuit 7, a head switch change-over signal generator 8 and a memory circuit 9. The traveling and stoppage of a magnetic tape corresponding to one track are repeated alternately while being synchronized with the head switch change-over signal generator 8, and slow reproduction is conducted. That is, the data of a picture signal is read intermittently every one track in the tape, and acquired information is selected and the picture plane of slow reproduction is constituted. Accordingly, an exclusive head for slow reproduction is not required, and the picture plane of noiseless slow reproduction having high resolution is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a helical scanning type magnetic recording/reproducing device.

2. Description of the Related Art In recent years, there has been an increasing demand for high image quality and high sound quality for VTRs. Currently, high-definition television is being put into practical use in response to this. In this high definition, NT
Since the amount of information is 4 to 5 times that of the SC method, it is difficult to record one field of information on one track, and high-density recording using multi-channel recording or multi-segment recording is being actively considered. There is.

In slow playback of an NTSC VTR, as shown in Figure 8, two heads 3 used during recording are used.
5.36 (with different azimuth angles and arranged in the cylinder at 180 degrees from each other) and two heads 37 and 38 provided for special reproduction are used to reproduce stills.

A method for performing slow playback is well known (Tokuko Sho 6).
2-8991). However, the head 37 is installed near the head 35 and has the same azimuth angle as the head 36. Further, the head 38 is installed near the head 36 and has the same azimuth angle as the head 37. In this configuration, slow playback is performed while selecting and using either the set of head 35 and head 38 or the set of head 36 and head 37.

Problems to be Solved by the Invention However, the above configuration is for recording one field of information on one track, and is directly applicable to multichannel recording where one field of information is recorded on multiple tracks. It is not possible. The present invention solves the above problems and provides a magnetic recording device that performs high-resolution, noiseless slow playback in a multi-channel recording system.

Means for Solving the Problems In order to solve the above problems, a magnetic recording and reproducing apparatus according to the claims of the present invention includes a rotating cylinder,
2n magnetic heads are arranged at an angle of 80°/n so that adjacent ones have different azimuth angles without any head step, and when the tape is stationary, an output video signal reproduced from the magnetic nodal is selectively transmitted. a head switch circuit for switching; a head switch switching signal generator for controlling switching timing of the head switch circuit;
A memory circuit for storing the video signal selected by the head switch switching circuit is provided, and the magnetic tape for one track is alternately run and stopped in synchronization with the head switch switching signal generator to perform intermittent feeding. By doing so, slow playback is performed.

Effect of the Invention The present invention has the above-described structure, and in a multi-channel recording type VTR in which one field of information is recorded on a plurality of tracks, the tape is intermittently fed one track at a time, and video signal data is read and obtained. Since the slow playback screen is constructed by selecting the information obtained, a high-resolution, noiseless slow playback screen can be obtained without requiring a dedicated head for slow playback.

EXAMPLE An example of the present invention will be described below based on the drawings. Here, an example will be described in which one field of information is written on three tracks, that is, in the case of three-channel recording where n=3. FIG. 1 is a block diagram of a magnetic recording device in a first embodiment of the present invention. FIG. 2 is a layout diagram of the magnetic head of the cylinder, and FIGS. 3, 5, and 7 are state diagrams of tracks recorded on the magnetic tape and the trajectory of the magnetic head. FIGS. 4 and 6 are diagrams showing the positional relationship between the tape and the magnetic head. FIG. 8 is a head layout diagram of a conventional configuration example.

FIG. 2 is a diagram showing six magnetic heads 1, 2, 3, 4, 5.6 arranged on the rotating cylinder 13. From then on,
The magnetic head will be simply called a head. head 1,
2.3, 4, and 5.6 are distributed and arranged at an angle of 60°. The head 1.3.5 has an azimuth angle of R, and the nozzle 2.4°6 has an azimuth angle of L, and these two heads with different azimuth angles are arranged alternately without a head step. It is. The rotating cylinder 13 rotates in a half hourly manner. During recording and reproduction, the magnetic tape 12 passes through the inclined post 10 and is attached to the rotating cylinder 13 by approximately 180 degrees.
The head 1, which contacts the
2.3, one field of information is recorded on three diagonal tracks, and heads 4 and 5.6 record one field of information on the adjacent three diagonal tracks.
One frame of information is recorded on six tracks.

FIG. 3 is a diagram showing tracks recorded by the rotary heads 1.2, 3, 4, and 5.6 on the rotary cylinder 13 shown in FIG. 2 and the locus of the center of the head during stilling. . In FIG. 3, tracks 14, 15.16 are tracks recorded by heads 4, 5.6, respectively.

Also, tracks 17, 18, and 19 are tracks recorded by head 1.2.3. Truck 20°21
．． 22 is a track further recorded by head 4.5.6 in FIG. Also, track 15°1? , 19.2
1 has an azimuth angle of R, tracks 14, 16.1B
, 20.22 has an azimuth angle of L.

In the first still reproduction state (referred to as still I), the head trajectories of each head are all the head trajectories 23 because there are no head steps of each head and no movement of the tape. Divide the track into three parts, 24 areas at the bottom of track 16 and 25 areas at the center of track 17.
, the upper area of track 18 is assumed to be 26. Now, the relative positions of the tape and the head are as shown in FIG.
The head 3 with the lower end of 26 and the azimuth angle of R is area 2.
Suppose it is at the lower end of 5. From this point on, the cylinder is 1/6
When rotating, that is, during 1/3 field time, the azimuth angle heads 4.2 each scan the azimuth angle areas 24 and 26, and the azimuth angle head 3 scans the azimuth angle area 25. scan. Since the heads 4, 3.2 and the tracks 16, 17.18 have the same azimuth, it is possible to read out the video signal in the area 24°25.26 in this still I, which is represented by the shaded area in FIG. ing.

From this state, when the tape is advanced by one track and reaches the second still playback state B (referred to as still ■), the head trajectory becomes as shown in FIG. At this time, the throat trajectory becomes 27. The track is divided into three parts, and the lower area of the track 17 is defined as 28, the center area of the track 18 is defined as 29, and the upper area of the track 19 is defined as 30. The timing of tape feeding will be explained later. Now, for example, the position of the tape and the head are as shown in FIG.
Assume that the head 6 having an azimuth angle of L is located at the lower end of the area 29. From this point on, when the cylinder rotates 1/6, that is, during 1/3 field time, the head 1 with azimuth angle R. 5 are areas 28. of azimuth angle R, respectively.
30, and the azimuthal head 6 scans the azimuthal area 30. Each henod 1,6゜5
and tracks 17, 18, and 19 have the same azimuth angle, so in this still ■ area 28, 29, 3
The video signal in the 0 area can be read out.

Further, when the tape is advanced by one track and reaches the third still playback state (referred to as still ■), the head trajectory becomes as shown in FIG. The head trajectory is as shown in 31. Similarly, the track is divided into three parts, and the area at the bottom of the track day is 32,
The area at the center of the track 19 is assumed to be 33, and the area at the top of the track 2o is assumed to be 34. For example, let us assume that the head arrangement is as shown in FIG. 4, similar to the still (2). When the cylinder rotates 1/6 from this point, the azimuth angle hemlocks 4 and 2 scan the azimuth angle areas 32 and 34, respectively, during exactly 1/3 field time, and the azimuth angle R
The nose 3 scans an area 33 with an azimuth angle R. Head 4, 3.2 and track 1B, 19.20 have the same azimuth angle, so in this still ■, area 32.3
It is possible to read video signals in the 3.34 area.

By performing still I, n, and I[t three times in this manner, the obtained video information becomes the shaded area as shown in FIG. One field information we are trying to get here is:
Assuming that it is recorded on tracks 17, 18, and 19,
Area 25.28 on track 17 and area 26.29 on track 1 are video information used during slow playback.
, 32. By using the information in areas 30 and 33 on track 19, it is possible to play back 67% of the video signal at the top and bottom of the track and 100% at the center, creating a noiseless slow playback screen. can be obtained.

FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. The head is composed of six heads 1, 2, 3, 4, 5, and 6 as shown in FIG. Further, the head switch circuit 7 selectively selects signals from the information reproduced from these six heads, and further outputs the signals to the corresponding channel lines. After that, each channel for the 3 channels will be Ach.

A head switching signal generator 8, called Bch and Cch, sends a signal to the head switch circuit 7 and generates a signal for controlling the head switch circuit.

Further, the tape is kept stationary and repeatedly fed by one track while being synchronized with the head switch and the thousand switching signal generator 8. The memory 9 is Ach output from the head switch circuit 7.

The Bch and Cch signals are recorded in the memory at the address corresponding to the position on the track. Once the video signal corresponding to one field is stored, the memory information is sequentially read out to form a screen for slow playback.

Detection of the first field information in the above configuration will be explained. Here, it is assumed that the tracks for the first field are tracks 17, 18, and 19, and information of Ach, Bch, and Cch is recorded, respectively. First, let T be 1/3 of one field time. Also,
Still I, II.

In the state (2), the nozzles in contact with the tape are designated as α head, β head, and γ head in the clockwise direction. It is in the case of the conditions shown in Table 1 that information such as the example described above can be obtained in the stills I, It, and I[l.

Table 1 In stills I, n, and II where the tape is in a stationary state, the active heads that are in contact with the tape and reproducing the video signal during time T are the α head, β head, and T head. In still I, the heads that reproduce necessary field information are the α head and the β head. As explained in Fig. 3, the α head is on track 18 of Bch.
Since the information on the upper part of the α head is being reproduced, the head switch circuit switches to output the signal reproduced by the α head to the Bch signal line. β head is Ach track 1
Since the information in the center of 7 is being reproduced, the signal reproduced at the throat of β is switched to be output to the Ach signal line. Since the signal reproduced by the γ head is information of another field, the head switch circuit does not output it. The signal output from the head switch circuit is stored in the memory at the address corresponding to the position on the track. With these operations, the still I state is completed, and the tape is then sent to move to the still II state. It takes 2 mT (rr
+1. , 2...) is the tape feeding period.

Next, the tape is held still and becomes a still state.

During time T, the α, β, and γ heads are located at the top of the Cch track 19, the center of the Bch track 18, and the Ach).
Since signals from the lower part of the rack 17 are being read, the head switch circuit 7 is switched to output to the Cch, Bch, and Ach signal lines, respectively. and,
These signals are stored in memory 9 as in the case of still I.

Then, tape feeding is started in order to move to the still state (2). Similar to when moving to still ■, the positional relationship between the tape and the head is 2nT (rr+-1, 2, 3...
) The tape is fed by one track during the period.

In the still state (2), since the α head is reading out other field information during the time T, the head switch circuit 7 does not output any output. β and γ heads each have Cch track 19
The signals at the center of the Bch track 18 and the top of the Bch track 18 are read out, and the head switch circuits read out the signals at the center of the
It can be switched so that it is output to the signal line. These signals are then stored in memory as in the case of stills I and II. Then, the tape begins to be fed in order to move to the STILL (2) state for reading the information of the next field. As in other cases, 2kT (k-1゜2.3...
...), one track of tape is fed.

These relationships are shown in Table 2 below.

The head switch switching signal generator 8 sends a signal to the head switch circuit 7 to switch these head switches. On the other hand, after reading the information on the tape in synchronization with the pattern of the head switch switching signal, one field of information is read and stored in the memory 9 in the process of 0 or more tape feeding for one track.

In slow playback, while the information in the second field is being read from the tape, the information in the first field is sequentially read out from the memory to form a screen. Further, while the information in the third field is being read out, the information in the second field is read out from the memory to form a screen. By continuing this, slow playback is performed.

If m = n = -1 as shown above, it takes 3 fields to read one field of information, so it is 1/3
Double the throw can be achieved. m.

It is also possible to reproduce field information without missing information by storing the information of the part and the information of the 340 parts obtained from the α head in still ■ in a memory, and repeating a series of slow reproduction operations.

With the above configuration, high-resolution, noiseless slow playback can be performed without using a special playback head.

Although the case where one field of information is recorded on three tracks is explained here, the pattern of the head switch switching signal generator 8 and the timing of moving the tape can also be changed in the case where the information is recorded on multiple other tracks. It can be configured in the same way just by changing it.

Effects of the Invention As described above, the present invention provides an n-channel recording VTR.
- The tape is driven intermittently for one track during each intermittent operation, eliminating the need for a dedicated head for slow playback and allowing normal 2-track playback.
By sequentially storing in memory the playback signals played by n heads out of n playback heads when the tape is stopped during each intermittent operation, and reading field information from the memorized information, high Tut without noise can be achieved. Accordingly, it is possible to provide a magnetic recording and reproducing device that can obtain slow-motion reproduction images.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the magnetic recording/reproducing device, Fig. 2 is a head arrangement diagram of a rotating cylinder, Fig. 3 is a status diagram of the track and head trajectory in Still II, and Fig. 4 is a diagram of the tape and head in Still I. Figure 5 is a diagram showing the track and head trajectory of still LTI, Figure 6 is a diagram showing the position of the tape and head in still ■, and Figure 7 is a state diagram of the track and head trajectory in still I, ■, ■. , FIG. 8 is a head layout diagram of a conventional configuration. 1.2, 3.4.5.6...Head, 7...
. . . Head switch switching circuit, 8 . . . Head switch switching signal generator, 9 . . . Memory. Name of agent: Patent attorney Haruaki Koba and two others Figure 2 Figure 4 Figure 6

Claims (1)

[Claims] This is a magnetic recording and reproducing device that slowly reproduces video signals from a magnetic tape on which one field of video signals is recorded over n diagonal tracks (n is an integer of 1 or more), and includes a rotating cylinder and the rotating cylinder. 2n magnetic heads are arranged such that adjacent ones have different azimuth angles at an angle of 180°/n without a head step difference, and output video signals reproduced from the magnetic heads when the tape is stationary are selectively transmitted. The head switch switching signal generator includes a switching head switch circuit, a head switch switching signal generator that controls switching timing of the head switch circuit, and a memory circuit that stores a video signal selected by the head switch circuit. 1. A magnetic recording and reproducing apparatus characterized in that slow playback is performed by alternately repeating running and stopping of one track of the magnetic tape in synchronization with an intermittent feed.