JP2840742B2 - Video signal recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording device, and more particularly to a device for recording a video to be edited on a magnetic tape.

[Conventional technology]

The VTR leaves a memo with a time code and a corresponding list of scenes for each tape so that the contents of the recorded image can be grasped, and uses the memo for editing work at a later date. However, as the number of tapes increases, memo management becomes difficult, and it is not possible to immediately know what kind of scene, so search time for cueing becomes longer, and it takes time to create a story. I was

As a technique for displaying an image recorded at the time of editing as a split screen, for example, as described in JP-B-61-4437, a screen before and after an editing point is divided into one screen and displayed simultaneously. Things have been suggested.

[Problems to be solved by the invention]

The technique described in the above-mentioned document simultaneously displays the screens before and after the edit point, and is effective in accurately determining the edit point. However, it is insufficient to know what image is recorded at which position on the entire tape, and it is not useful for shortening a search operation for locating a desired scene. .

Therefore, an object of the present invention is to create a table of contents that allows the position and contents of an image recorded on a tape to be known at a glance, and record this table of contents on a tape.
It is an object of the present invention to provide a video signal recording device capable of easily and quickly performing cueing at the time of editing.

[Means for solving the problem]

The present invention relates to a video signal recording apparatus for recording a recorded video signal in which a frame is temporally continuous and recorded in a video signal recording area of a recording medium, by generating an address signal indicating a position of the recording medium. Means for recording the signal together with the recording video signal in the address signal recording area of the recording medium, and a time interval obtained by dividing the recording time of the recording medium by the number of divided screens while recording the video signal from the imaging device. Means for generating a control signal at substantially equal time intervals; first gate means controlled by the control signal to select one frame of the recorded video signal at each time interval; first gate controlled by the control signal; Means for selecting an address signal corresponding to a recording video signal of one frame selected by the means, and one frame selected by the first gate means. Compression means for compressing the recorded video signal, a first memory for storing the video signal from the compression means as one of the divided screens, and a second memory for storing the address signal selected by the second gate means. When the video signal of the number of divided screens is stored in the memory and the first memory, the video signal of the number of divided screens is recorded in a video signal recording area at a predetermined position of the recording medium and is stored in the second memory. Means for recording respective address signals of the video signals of the number of divided screens in an address signal recording area at a predetermined position of a recording medium.

[Action]

At the time of the recording operation, the screen at a fixed time or at the time designated by the switch operation is recorded on the tape,
It is written to the frame memory. In this case, each screen
It is compressed and written to the frame memory. A predetermined number of screens are written in the frame memory, and the divided screens are recorded. Further, an address signal indicating the position of each screen, for example, a time code is stored in the memory. After a series of recordings on the tape, at the desired position on the tape, for example, near the end of the tape, the divided screen recorded as described above and the time code corresponding to each screen of the divided screen are recorded as a kind of table of contents. You.

In the tape recorded according to the present invention, first, a divided screen and a time code as a table of contents are reproduced and stored in the memory of the editing machine. The divided screen read from the memory of the editing machine is displayed on the monitor, and a desired screen is designated while looking at the monitor. As a result, the time code of the desired screen is given to the editing machine, and the tape position of the VTR is sent to the position where the desired screen is recorded. This cueing operation shortens the time of the search operation for searching for a desired screen.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 indicates a video camera,
An imaging output signal of the video camera 1 is supplied to the recording circuit 3 via the terminal a of the switch circuit 2. A recording signal is formed by the recording circuit 3, and the recording signal is
Are supplied to the magnetic heads 5A and 5B via the
Will be recorded. The magnetic heads 5A and 5B are, for example, rotating heads having a facing interval of 180 °, and are rotated at a frame frequency. By the magnetic heads 5A and 5B, a recording signal of one field is sequentially recorded as one oblique track.

An imaging signal from the video camera 1 is supplied to the addition circuit 7. The output signal of the character generator 8 is supplied to the addition circuit 7, and the number corresponding to the screen number is superimposed on the imaging signal. The output signal of the adding circuit 7 is supplied to the A / D converter 10 via the gate circuit 9. Gate circuit 9
Is turned on at regular intervals according to the output signal of the timer 11. The timer 11 operates only during a recording operation, and specifies a position of the magnetic tape 6 at a constant interval. Further, a manual switch 12 is provided in association with the timer 11, and when the switch 12 is turned on, a control signal for turning on the gate circuit 9 is generated. The control signal for the gate circuit 7 is also supplied to the character generator 8, and each time the gate circuit 7 is turned on or the switch 12 is turned on, the screen number generated from the character generator 8 is incremented.

The digital video signal from the A / D converter 10 is the compression circuit 1
Supplied to 3. The compression circuit 13 thins out pixels according to the compression ratio in the horizontal direction, that is, in the sample direction, and in the vertical direction, that is, in the line direction. The output signal of the compression circuit 13 is written to the frame memory 14. In this embodiment, as shown in FIG. 2, one screen is divided into nine (3 × 3). Therefore, in the compression circuit 13, the pixel data for one frame is thinned out so as to be reduced to 1/3 in the horizontal direction and the vertical direction, respectively. In FIG. 2, a1, b2, c
Each of 3, d4, e5, f6, g7, h8, and i9 indicates a screen sampled by the gate circuit 9, and the screen numbers 1 to 9 are superimposed on the imaging signal of each screen in this order.

Digital data is supplied to the D / A converter 15 on the divided screen read from the frame memory 14, and an analog video signal from the D / A converter 15 is supplied to the recording circuit 3 through the terminal b of the switch circuit 2. Are recorded on the magnetic tape 6 by the magnetic heads 5A and 5B.

Reference numeral 16 denotes a fixed magnetic head for recording a time code in the longitudinal direction of the magnetic tape 6. 17 is a time code generation circuit for generating a time code, and 18 is a time code reading circuit for decoding the time code.
As the time code, for example, an SMPTE time code can be used. The tape position may be indicated by a time code other than the SMPTE time code or address data. When recording the image pickup output of the video camera, the time code generated by the time code generation circuit 17 is supplied to the magnetic head 16 via the recording amplifier 19 and recorded on the magnetic tape 6.

At the same time, the time code is supplied to the time code reading circuit 18 via the switch circuit 20. The switch circuit 20 is turned on by a control signal from the timer 11,
The time code corresponding to the frame stored in the frame memory 14 is supplied to the time code reading circuit 18.
The time code data from the time code reading circuit 18 is stored in the memory 22 through the control circuit 21. Therefore, the memory 22 sequentially stores nine time codes indicating the recording positions of the divided screens. A screen number of each screen is recorded in the memory 22 together with the nine time codes.

The time code and the screen number stored in the memory 22 are read by the control circuit 21 and supplied to the time code generation circuit 17 via the switch circuit 23. The screen number is inserted into the user bits of the time code. The time code from the time code generation circuit 17 is stored in the recording amplifier 19
Is supplied to the magnetic head 16 and recorded on the magnetic tape 6. This switch circuit 23 and the aforementioned switch circuit 2
Is controlled by the output of the timer 11. That is, if nine frames equal to the number of divisions are stored in the frame memory 14,
The switch circuit 23 is turned on, and the switch circuit 2 is switched to the terminal b.

In the above-described embodiment, when recording the imaging output of the video camera 1 on the magnetic tape 6, the switch circuit 2 is connected to the terminal a. Therefore, the image pickup signal is supplied to the recording circuit 3 via the switch circuit 2, and the recording signal from the recording circuit 3 is recorded on the magnetic tape 6 by the magnetic heads 5A and 5B. In this case, the screen at regular time intervals controlled by the timer 11 is compressed and stored in the frame memory 14.

A time code generated in synchronization with the recording of the video signal is supplied to the magnetic head 16 via the recording amplifier 19,
It is recorded as a track in the longitudinal direction of the magnetic tape 6.
As described above, the time code of the screen stored in the frame memory 14 at regular intervals is sampled by the switch circuit 20 and stored in the memory 22 under the control of the control circuit 21. In this case, the screen number corresponding to the time code of each screen is also stored in the memory 22. The time interval for storing the screen is determined by the time that can be recorded on the tape and the number of divisions. For example, when the tape has a recording time of 20 minutes and the number of divisions is 9, a screen every about 2 minutes and 13 seconds is stored in the frame memory 14 as a divided screen.

As shown in FIG. 3A, when video signals including screens a1 to i9 are sequentially recorded on the magnetic tape 6 from the start end 25 thereof,
Next, the switch circuit 2 is switched to the terminal b side, and the data of the divided screen stored in the frame memory 14 is read. The read divided screen data is converted into an analog video signal by the D / A converter 15 and
Supplied to The output signal of the recording circuit 3 is supplied to the magnetic heads 5A and 5B. At the same time, the switch circuit 23 is turned on, the time code and the screen number of the divided screen stored in the memory 22 are supplied to the time code generation circuit 17 through the control circuit 21 and the switch circuit 23, and the generated time code is output. It is supplied to the magnetic head 16 via the recording amplifier 19. The screen number is recorded as a time code user bit.

In FIG. 3A, a video signal of a divided screen and a time code including a screen number as user bits are recorded near a tape end 26 indicated by a hatched area 24. FIG. 3B conceptually shows the state of recording in the hatched area 24. The video signal of the divided screen from the frame memory 14 is repeatedly recorded by at least the number of divided frames. This is because recording a time code corresponding to one screen requires a length of one frame period. In this example, (3 × 9 =
27) The video signal and time code of the divided screen are recorded over the frame. Further, on a time code track extending in the longitudinal direction of the magnetic tape 6, a start code 27 corresponding to the start end of the hatched area 24 is recorded.
At the end of, an end code 28 is recorded.

Note that the video signal of the divided screen and the time code including the screen number may be recorded not only near the end of the magnetic tape 6 but also near the start of the magnetic tape 6.

When the editing operation is performed using the magnetic tape recorded as described above, the editing device includes a device for identifying the start bit 27 and the end code 28 in the time code reproduced from the magnetic tape 6 and a divided screen. A frame memory for storing and a memory for storing a time code and a screen number are provided.

First, the magnetic tape 6 is moved from the tape end 26 to the shaded area 24.
Is rewound to the position where is recorded. Next, the hatched area of the magnetic tape 6 is reproduced, and the video signal and the time code of the divided screen are reproduced. In this case, the start code
Starting from 27, the video signal of the divided screen, the time code and the screen number relating to the divided screen are stored in the frame memory and the memory of the editing apparatus.

Thus, preparation for cueing is completed. Next, the data of the divided screen stored in the frame memory is repeatedly read, and the divided screen is displayed as a still image on the monitor. While viewing the display of the divided screen, the screen number of the desired screen is designated by a key switch or the like. When a screen number is given, a time code corresponding to the screen number is read from the memory, and remote control is performed so that the position of the magnetic tape 6 is sent to the position of the time code. By searching for the images before and after the designated screen number, the cueing can be performed in a short time.

In the above-described embodiment, the divided screen of one frame is used. However, the table of contents of the image recorded on the magnetic tape may be formed by the divided screen of a plurality of frames.

〔The invention's effect〕

According to the present invention, since the table of contents of the image recorded for each recorded magnetic tape, that is, the divided screen in which the discrete screens are combined and the time code indicating the position of each screen are recorded, The cue can be easily and quickly performed by looking at this table of contents. Therefore, unlike the related art, a memory for the recorded video is not required, and the trouble of managing the memo can be eliminated.

Further, in the present invention, the recording video signal is gated at predetermined time intervals by a timer to form a divided screen obtained by compressing a plurality of frames of the video signal.
Each address signal of the divided screen is recorded separately. Therefore, at the time of recording, the screen of the recorded video signal can be automatically recorded as a table of contents without the user having to operate a switch or the like, and it is troublesome to set an address or determine a divided screen after reproducing the recorded video once. Is unnecessary, and since the address signals of the plurality of divided screens are recorded in the address signal area, there is an advantage that the address signal of each divided screen can be reproduced at the time of reproduction by the same processing as the reproduction of the normal address signal.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of a divided screen, and FIG. 3 is a schematic diagram used to explain a recorded tape in this embodiment. . Description of main reference numerals in the drawings 1: video camera, 6: magnetic tape, 8: character generator, 11: timer, 14: frame memory, 16: magnetic head for recording and reproducing time code.

Claims (1)

(57) [Claims] An image signal recording apparatus for recording a recorded video signal, which is imaged by an imaging device and has temporally continuous frames, in a video signal recording area of a recording medium, generates an address signal indicating a position of the recording medium, Means for recording the address signal together with the recording video signal in the address signal recording area of the recording medium; and a time obtained by dividing the recordable time of the recording medium by the number of divided screens while recording the video signal from the imaging device. Means for generating a control signal at each time interval substantially equal to the interval, first gate means controlled by the control signal and selecting one frame of the recording video signal at each time interval, controlled by the control signal A second gate means for selecting the address signal corresponding to a recording video signal of one frame selected by the first gate means; Compression means for compressing the recording video signal of one frame selected by the compression means, first memory for storing the video signal from the compression means as one of the divided screens, selection by the second gate means A second memory for storing the divided address signals, and a video signal recorded at a predetermined position on a recording medium when the video signals of the divided screen number are stored in the first memory. Means for recording in the area and recording each address signal of the video signal of the divided screen number stored in the second memory in an address signal recording area at a predetermined position of the recording medium. Video signal recording device.