JPH01212183A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To visually grasp the recording contents of a tape in a short period by recording still picture information, which are selected and designated by a picture designating means, to an edge part concerning a length-wise direction in a second area, which is parallel with a first area on the magnetic tape. CONSTITUTION:In addition to a first area 1, for which a normal recording and reproducing track is formed on the magnetic tape to be a recording medium, a second area 2 is provided as a sub-area. The still picture information of the designated picture (one picture in the head of one program, for example) are totally recorded to the tape edge part in the second area 2 successively as still picture information. Accordingly, only by reproducing only the sub-area part 2 in the beginning edge of the tape, the contents to be recorded to the tape can be known at a glance. Thus, a user can be speedily search the tape, which is desired to be observed, in an extremely short period.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a one-time recording and reproducing device for recording and reproducing video signals, and in particular to an Flf1 device that allows the content recorded on a magnetic tape to be grasped in a short time. A recording/re-recording/playback device.

[Prior Art] Conventionally, in recording and reproducing devices such as VTRs (video tape recorders) that use tape-shaped recording media, in order to quickly find out the recorded contents, it is necessary to fast-forward the tape or play the tape in fast-forward mode. I had to go ahead and check it out.

Recently, devices have been proposed that have a function of automatically feeding the tape using a cue signal and playing back the beginning (first screen) of each scene of the video for several seconds at a time.

[Problems to be Solved by the Invention] However, in the conventional method described above, it is necessary to feed the tape at high speed, but there is a high possibility of tape damage, so there is a limit to how fast the tape can be fed. , and considering the time loss of mode transitions such as stopping and playing,
One drawback was that it took a considerable amount of time to understand the contents of one piece of tape.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording/reproducing apparatus which eliminates the above-mentioned drawbacks and allows the recorded contents of a tape to be visually grasped within a very short time.

[Means for Solving the Problems] In order to achieve the above object, the present invention records a video signal in a first area extending in the longitudinal direction of a magnetic tape, and transfers the recorded video signal from the first area. In a magnetic recording and reproducing device for reproduction, a screen specifying means selects and specifies a reference screen from among the video signals recorded in the first area, and still screen information selected and specified by the screen specifying means is recorded on the magnetic tape. The present invention is characterized in that it includes a recording means for recording at an end in the longitudinal direction of the second region parallel to the first region.

[Function] With the above configuration, the present invention provides a second area as a subarea in addition to the first area where normal recording/reproducing tracks are formed on the magnetic tape as a recording medium, and displays a designated screen ( For example, the still image information of one screen at the beginning of one program can be recorded in sequence at the end of the tape in the second area as still image information, and only the part of the subarea at the beginning of the tape can be played back. , the contents recorded on the tape can be seen at a glance, and the user can quickly find the tape he or she wants to watch in an extremely short time.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a circuit configuration of an embodiment of the invention which will be described later, and FIG. 2 shows a recording pattern on a magnetic tape in the embodiment of the invention shown in FIG.

First, the recording pattern will be explained. In Figure 2, 1 is the main video recording and playback area (first
2 is a sub-area (second area) for recording still images of each scene related to the video/audio signal, and 3 is a time code area for recording a time code.

In addition, in the recording and reproducing section of this embodiment, six recording and reproducing heads are attached to the outer periphery of one drum, three each facing 180 degrees, and each of these three heads covers one field. The signals are distributed to three tracks and recorded and played back on each of the three tracks. The tape shown in FIG. 2 is wound around the drum by about 210 degrees, of which 180'' is used for normal recording and reproduction of area 1.

Next, normal recording/reproducing operations will be explained with reference to the circuit configuration shown in FIG.

During recording, the luminance signal and color difference signal of the video signal are inputted in parallel from an external video input device such as an imaging camera through the external input terminal 3. These human input signals are A/D (
After the signal is converted into a digital signal by an analog/digital converter 4 and sampled, it is supplied to a buffer memory 5 and stored as -B6. At this time, an FCC (error correction code) addition circuit 6 adds ECC to the stored data.

Next, the signal read from the memory 5 is added by the sync addition circuit 7 to each data block in which sync data (synchronization signal) and sync plotter numbers are divided finely, and further modulated by the digital modulator 8. The signal is supplied to the recording/reproducing section 9 and recorded in the video/audio recording/reproducing area 1 on the magnetic tape via the head.

During playback, the video and audio signals played back from the recording/playback unit 9 are demodulated by the digital demodulator 11, and then each data is restored by the data detection circuit 12 and sent to the frame memory 13.
is supplied to and stored at - hours. In memory of ECC
Error correction is performed by the decoding circuit 14. memory 1
The signal read from the D/A (digital/analog) converter 15 converts the signal into an analog signal and outputs it from an external output terminal 16 to a monitor such as a TV receiver.

Next, with reference to the flowchart of FIG. 3, the recording and reproducing operation of index still images according to the present invention will be explained.

First, while the video recorded on the tape is being played back on the monitor as described above, when the user finds a screen that he wants to use as an index, he stops the screen using the stay key (not shown) provided on the operation unit 171 (step Sl). At this time, the memory 13 stores one frame of information about the still image that you want to index, so if you switch to the index mode using the switch on the operation unit 171, the CPU
(Index mode control circuit) 17 is activated, switch 172 is switched, and the information in memory 13 is supplied to recording memory 5 and stored (step 52). next,
The tape is automatically rewound to the starting end, and recording of the index image begins (step S3).

That is, ECC is added to the still image signal supplied to the memory 5 by the ECC adding circuit 6 as in normal recording, and sync data and a sync block number are added by the sync adding circuit 7, and the signal is sent through a digital modulator. The signal is supplied to the recording/reproducing section 9 and recorded on the magnetic tape via a head. During this recording, the switching control circuit 10 converts images from FIG. 4(A) and (B) to FIG. 4(C).
), (D), the switching signal changes as shown in
Switching is performed by the switching circuit 101 so that the data is recorded only in subarea 2. At the same time, the read timing from the memory 5 is also changed.

In this embodiment, subarea 2 is approximately 30° of the drum, and is approximately 1/6 of the normal recording/playback track, so 1
18 tracks are used to record information for one field. Note that if the image quality of the index image does not need to be so good, data may be thinned out to reduce the amount of information to be recorded and the number of tracks used. You can also freely set the recording time.

At the end of recording the index image, an end signal 18 is written onto the magnetic tape as shown in Figure 2, and when recording the next index image on the tape, the recorded video must first be played back. From (step S4)
, this end signal (index signal) +8 is detected (step S6), and if the next end signal is no signal (step S7), short rewind is performed (step S8), and video playback starts again (step S6). Step S9),
When the end signal I8 is detected (step 510), an operation is performed to switch to recording from the next field (step 511). In this way, still images are sequentially recorded in the subarea 2 at the beginning of the magnetic tape.

Next, reproduction of still images recorded in sub area 2 will be explained.

When the device of this embodiment is set to the index playback mode using the mode switch of the operation section 171, it enters the normal playback operation, but the timing circuit 19 digitally modulates only the recording signal of the sub-area 2 from the signal played back by the recording and playback section 9. The data is supplied to the memory 13 through the data detector 11 and the data detection circuit 12. Next, error correction is performed in the memory 13 by the ECC decoding circuit, and the signal read out from the memory 13 is outputted from the external output terminal 16 via the D/A converter J5, and a still image is displayed on the monitor. It is visible as a playback.

At this time, the output screen can be divided into several parts using another memory (not shown), and a plurality of scenes can be displayed simultaneously on the screen. It is also possible to configure the configuration so that the time code information for that part is recorded in time code area 3 along with the still image for one field.If the time code information is also recorded at the same time, cueing will be smoother. can be done.

[Effects of the Invention] As explained above, according to the present invention, a subarea (second area) is provided on a magnetic tape, which is a recording medium, in addition to the first area where a normal recording/reproducing track is formed. Since the still image information of the specified screen (for example, one screen at the beginning of one program) is recorded as still image information in the subarea at the end of the tape, only the part of the subarea at the end of the tape will be played back. The recorded contents can be seen at a glance, and the user can quickly turn to the tape he or she wants to watch in an extremely short period of time.

In other words, according to the present invention, since a still image is recorded in a sub-area near the end of the tape, it is possible to obtain a table of contents effect in which the contents of the tape can be immediately understood by simply playing back the end of the tape. It will be done.

Furthermore, since this still image can be easily rewritten, there is also the effect that specified screens can be easily switched or deleted.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the circuit configuration of the embodiment of the present invention, Figure 2 is an explanatory diagram showing the recording pattern of the magnetic tape used in the embodiment of Figure 1, and Figure 3 is the index image recording mode of Figure 1. FIG. 4 is a timing chart showing the output timing of the switching signal in the embodiment of FIG. 1. l... Main video recording and playback area (first area), 2... Sub area (second area), 3... Time code area, 9... Recording and playback section, 10... Switching control circuit, 12... Data detection circuit, 13... Memory, 17... CPU (index mode control circuit), 18... Index end signal, 19... Timing circuit.

Claims (1)

[Scope of Claims] 1) A magnetic recording and reproducing apparatus that records a video signal in a first area extending in the longitudinal direction of a magnetic tape and reproduces the recorded video signal from the first area, comprising: screen designating means for selecting and designating a reference screen from among the video signals recorded in the first area; and still screen information selected and designated by the screen designating means on the magnetic tape, and combining the still screen information with the first area on the magnetic tape. A magnetic recording/reproducing device comprising: a recording means for recording at an end in the longitudinal direction of the parallel second areas.