JPH0533114Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic still player capable of reproducing field images and frame images from a video signal recording medium.

[Conventional technology]

A video floppy disk, which is a video signal recording medium, has a field video signal in which one video signal is recorded on one track, and a frame video signal in which one video signal is recorded on two adjacent tracks. Two types of signals are recorded: a video signal and a video signal. The playback states of electronic still players that play back normal video from these two types of video signals are different from each other, and especially when you try to play field video in the frame video playback state, the two videos overlap and make no sense at all. The result is an image that doesn't really exist.

Therefore, an ID signal indicating whether the video signal is a frame video or a field video is multiplexed and recorded on the video signal, and the electronic still player decodes this ID signal and automatically converts it into a video signal. It is designed to switch to the appropriate playback state. In this case, while the ID signal is being decoded prior to video playback, normal playback may not occur, which may cause video disturbances.

On the other hand, when moving the playback head to another track to play back another video, normal playback may not be performed during the movement of the playback head and the video may become distorted.

This kind of image disturbance is very unsightly, so
In conventional electronic still players, a muting means is provided, and when the playback head is moved to another track, the movement of the playback head and the ID
The video signal is muted until the decoding of the signal is completed and a reproduction state corresponding to the video signal of the new track is reached.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional electronic still player, when an attempt is made to move the playback head to another track and play back another video, muting is always performed and the video is interrupted. Although this interruption in the image is not as bad as the disturbance in the image when no muting is performed, it is still quite unsightly.

[Means for solving problems]

In order to solve the above-mentioned problems, the electronic still player according to the present invention includes a playback head that takes out a field video signal and a frame video signal mixedly recorded on a video signal recording medium, and a playback head that takes out a field video signal and a frame video signal that are mixed and recorded on a video signal recording medium, and a playback head that outputs a video signal from the playback head. a muting means for mutating a video signal when moving the recording medium to another track on the recording medium; and a muting means for mutating the video signal when moving the playback head to a neighboring track while bringing the playback head into a field video playback state. The invention is characterized in that it includes a control means for controlling so as not to occur.

[Effect]

With the above configuration, when the playback head is moved to a track adjacent to the track being played, muting is not performed, and moreover, the playback head movement and ID signal decoding are completed and the playback head responds to the video signal of the new track. Since the playback state of the field video is maintained until the playback state is changed to the original playback state, the video is not interrupted or disturbed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, a video floppy disk 1, which is a video signal recording medium on which frame video signals and field video signals are recorded, is loaded into the electronic still player. This video floppy disk 1 is rotated by a video floppy disk driving means (not shown).

Playback heads 2 and 3 are provided facing the video floppy disk 1 and constitute an in-line double gap head for retrieving video signals recorded on mutually adjacent tracks of the video floppy disk 1. are connected to the a side terminal and the b side terminal of the switch 4, respectively. This switch 4 has its neutral terminal connected to side a when it is in the field video playback state, and takes out the video signal from the playback head 2, and when it is in the frame video playback state, it outputs the video signal for each field of the video floppy disk 1. At the same time, the neutral terminal is switched to the a side and the b side so that video signals from the reproduction heads 2 and 3 are taken out alternately.

The neutral terminal of the switch 4 is connected to the video signal processing circuit 5
It is connected to a monitor, etc. (not shown) via a muting circuit 6, which is video signal muting means. In addition, the neutral terminal of switch 4 is connected to an ID that is multiplexed and recorded on the video signal.
It is connected to an ID signal processing circuit 7 that separates and decodes the signals. The ID signal includes information that identifies whether the video reproduced by the video signal is a field video or a frame video.

Further, the system controller 8 connected to the ID signal processing circuit 7 further controls the switch 4, the muting circuit 6, and the playback heads 2 and 3 between the inner track and the outer track on the video floppy disk 1. It is connected to a stepping motor 9 that moves between the two. The system controller 8 controls the operation of the stepping motor 9, and serves as a control means for the reproduction head 2,
Switch 4 when 3 moves to a neighboring track.
is switched to change the playback state of the electronic still player to a field video playback state, and at the same time controls the muting circuit 6 so as not to perform muting.

In the above configuration, for example, when playback head 2 is located on track n and playback head 3 is located on track n+1, when an operation is performed to move playback heads 2 and 3 from the outside, the system controller 8 The control performed will be explained below based on the flowchart shown in FIG.

First, determine whether the video currently being played is a frame video or a field video. In other words, the video signals are extracted from both the n track and the n+1 track of the video floppy disk 1 by the playback heads 2 and 3. In step S1, it is determined whether the data is extracted from only n tracks by the playback head 2 or only by the playback head 2.

If the judgment in S1 is a field image,
Next, the destination track of playback head 2 is n+1.
or S2, or n-1 or S3, and if n+1, the stepping motor 9 is driven to move the playback heads 2 and 3 to the inner track by S4, and n-1 or S3.
If it is -1, move S5 to one track outside and move to S8. In other words, if the video currently being played is a field video and the tracks to which the playback head 2 is moving are adjacent tracks, the video will be played back the moment the playback head 2 reaches the destination track. Since the video is switched to a new video, the video is not disturbed and the playback heads 2 and 3 can be moved without muting.

If the destination track of playback head 2 in S2 and S3 is neither n+1 nor n-1, playback heads 2 and 3 will pass through other tracks before reaching the target track, resulting in a distorted image. First, after mutating the video signal in S6, move the playback heads 2 and 3 and move them to S7 and S8.
to move to.

In S8, the ID signal which has been separated and decoded by the ID signal processing circuit 7 is read from the video signal of the track to which the reproduction head 2 has moved. Next, playback head 2
Is the track on which S9 is located the outer track where the frame video signal is recorded or the inner track where the frame video signal is recorded?
Check whether the track is recording the S10 or a field video signal other than the above.
Check from ID signal.

In other words, the track where the playback head 2 is located is
When the frame video signal is recorded on the inner track, the playback head 3 is located on the track where another video signal is recorded, so the frame video cannot be played back as it is. Therefore, playback heads 2 and 3 are moved one track outside, and in step S11, playback head 2 comes to the outer track where the frame video signal is recorded, and playback head 3 comes to the inner track where the frame video signal is recorded. Then, return to S8 to check the ID signal again.

If the track on which the playback head 2 is located is the outer track where the frame video signal is recorded, the playback head 3 is located on the inner track where the frame video signal is recorded, so the playback head 3 is located on the inner track where the frame video signal is recorded. , the neutral terminal of the switch 4 is switched alternately between the a side and the b side to play a frame image, and the process moves to S12 and S14.

Furthermore, if the track on which the playback head 2 is located is a track on which a field video signal is recorded, the playback heads 2 and 3 are not moved;
The neutral terminal of the switch 4 is connected to the a side and the field video is played back, and the process moves to S13 and S14.

In S14, when the playback head 2 moves past another track, the muting performed in S6 is canceled and the control ends. However, when no muting is being performed, the muting circuit 6 does not do anything.

On the other hand, if it is determined in S1 that the video currently being played is a frame video, the playback head 2
S15 to check whether the destination track is n+1. If the video currently being played is a frame video, this n+1 track is the inner track where the signal of that frame video is recorded, so the track to which the playback head 2 moves is the n+1 track.
+1 is meaningless. Therefore, at this time, the system controller 8 ends the control without doing anything.

If the destination track of the playback head 2 is not n+1, then it is checked in step S16 whether the destination track of the playback head 2 is n+2. Playback head 2
When it is determined that the destination track is n+2, first set the field video to playback mode.
S17, move playback heads 2 and 3 two places inward.
Move to S18, S8.

In other words, the video signal recorded on the n track and the video signal recorded on the n+1 track, which are frame video signals, are similar. Therefore, if the playback head 2 is moved while the field video is being played, the playback head 2 will move from track n to track n.
When moving to the +1 track, the video to be reproduced is almost unchanged, and the video is switched to a new video the moment the n+2 track is reached, so the reproduction heads 2 and 3 can be moved without muting.

On the other hand, the destination track of playback head 2 is n+
If it is neither 1 nor n+2, the playback state is changed to a field video playback state and the process moves to S19 and S3, and the same processing as when the currently played video is a field video is performed.

[Effect of idea]

As described above, the electronic still player according to the present invention includes a playback head that takes out field video signals and frame video signals mixedly recorded on a video signal recording medium, and a playback head that takes out field video signals and frame video signals mixedly recorded on a video signal recording medium, and a muting means for mutating a video signal when moving the playback head to a neighboring track, and controlling the playback head to be in a field video playback state and not to mute the playback head so as not to mute the playback head. The configuration includes a control means. As a result, when moving the playback head to a track away from the track currently being played, muting of the video signal is performed to prevent image distortion, while the playback head is moved to a track near the track currently being played. When moving the track, no muting is performed, and the playback state of the field video is maintained until the playback head has been moved and the ID signal has been decoded, and the playback state corresponds to the video signal of the new track. This has the effect of preventing interruptions and disturbances in the video.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a block diagram showing the configuration of an electronic still player, and Figure 2 being a flowchart showing the processing performed by the system controller. be. 1 is a video floppy disk (video signal recording medium), 2 and 3 are playback heads, 6 is a muting circuit (muting means), and 8 is a system controller (control means).

Claims (1)

[Scope of utility model registration request] A playback head that extracts field video signals and frame video signals that have been mixedly recorded on a video signal recording medium, and muting that mutes video signals when moving this playback head to another track on the video signal recording medium. and control means for controlling the muting means so as not to perform mutating while bringing the playback head into a field video playback state when moving the playback head to a neighboring track. .