JP2676337B2 - Image signal playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image signal reproducing apparatus for selecting, retrieving and reproducing a desired image signal from a large number of image signals recorded on a recording medium. is there. [Prior Art] In an image signal reproducing device, for example, a VTR, so-called cueing is performed when searching one screen group from a plurality of screen groups recorded on a magnetic tape as a recording medium. For example, cueing using the well-known fast-forwarding and rewinding is performed as follows. In other words, remember the tape count value that is given in advance to the predetermined part to be cueed,
When fast-forwarding or rewinding is started, the magnetic tape runs at a high speed, the tape counter counts, and when the count value matches the tape count value given to the screen group in advance, the magnetic tape is removed. Switching to the normal running speed and starting playback, or stopping the running of the magnetic tape. That is, the reproduction is started from the head portion of each screen group, or the position where the traveling is stopped coincides with the head portion of the screen group. [Problems to be Solved by the Invention] In a conventional image signal reproducing apparatus, for example, a VTR, the screen group recorded on a magnetic tape is cued. Etc., there is a problem that the cueing work is complicated, and moreover, it becomes troublesome as the number of cassettes increases. In addition to the tape count value, you can enter the credits for each screen group, but even if you enter the credits, you can know the contents of each screen group only with this credit over time. There was a problem that it became difficult. Moreover, it is necessary to perform a complicated operation to find a desired screen. The present invention has been made in view of the above-mentioned problems, and provides an image signal reproducing apparatus capable of grasping the contents of the entire recording medium and searching for a desired image signal with a minimum necessary operation. The purpose is to do. [Means for Solving the Problems] An image signal reproducing device of the present invention is a device for reproducing a recording medium in which a large number of image signals are recorded together with a plurality of index signals, and the amount of conveyance of the recording medium is reduced. A counter that counts and reproduces a plurality of image signals according to the reproduction of the index signal from the large number of image signals, writes each as a reduced image in a memory, and extracts the count value of the counter each time the index signal is reproduced. By doing so, a forming means for forming an image in which the counter value is added as a character to a plurality of types of reduced images, and a specific reduced image is manually selected from the plurality of types of reduced images displayed together with the count value. Selection means,
The image signal corresponding to the selected reduced image is provided with search means for performing search and reproduction by comparing the count value displayed together with the selected reduced image with the count value of the counter. . [Operation] By adopting the above configuration, it is possible to search and reproduce a desired image signal only with a simple configuration in which a specific reduced image is manually selected from a plurality of reduced images displayed together with the count value. Became. EXAMPLES Hereinafter, the present invention will be described using one example of the present invention. FIG. 1 shows a schematic structure of a VTR which is an embodiment of the present invention. In the figure, 1 is an image reduction processing unit, which is a low-pass filter (LPF) 2 and an analog / digital converter (A /
D) 3, a thinning-out processing circuit 4, a clock signal generator 5, and a frequency divider 6, which are reproduced from a magnetic tape 25 which is a recording medium by a reproduction unit (not shown) and reproduced in a reproduction processing circuit 33 by, for example, the NTSC system. A composite color television signal is restored, and the reproduced television signal is thinned to reduce the image. The reproduced television signal is supplied to the B side of a changeover switch 32 described later, band-limited by LPF2, input to A / D3, and converted into a digital signal by A / D3. The digital signal is thinned out. The circuit 4 thins out pixels in the horizontal direction every three pixels and thins out lines in the vertical direction every three lines. The clock signal generator 5 selects one of the horizontal sync signal (HD), the vertical sync signal (VD) and the color burst signal (BURST), which is obtained by separating the sync signal from the reproduced television signal by the sync separation circuit 7, And BURST using nfsc (f
sc: frequency of color subcarrier)
It forms a clock signal that takes the sampling timing of A / D3. The frequency divider 6 forms a timing signal for timing the thinning processing circuit 4 from the clock signal. A field memory 8 stores reduced image data obtained from the image reduction processing unit 1. Reference numeral 9 denotes an address control circuit, which is the frequency dividing circuit 6
Is used as a write clock signal, a clock signal from a reference clock generator 20 described later is used as a read clock signal, and writing and reading of the feed memory 8 are controlled in synchronization with these clock signals. Specify the write address and write timing
This is performed by the servo syscon circuit 12 in synchronization with a lock detection signal from an ATF lock detection circuit 30 described later. The address control circuit 9 is reset in synchronization with the VD separated by the sync separation circuit 7. Reference numeral 10 is a tape counter that counts the tape running amount from the rotation cycle of a reel (not shown). A memory 11 stores the count value of the head of each screen group as index data. Writing and reading of index data to and from the memory 11 is performed by the servo syscon circuit 12. Further, in the servo system control circuit 12, a comparison calculation is performed between the index data key-input from the operation unit 13 and the count value of the counter 10. A character generator 14 outputs the character data of the count value to the superimposing circuit 16 described later based on the index data read from the memory 11. Reference numeral 15 is a multi-screen projection section, which has a superimposing circuit 16, a digital
Reduced image data read from the field memory 8 in the superimpose circuit 16 having an analog converter (D / A) 17, a changeover switch 32, a low-pass filter (LPF) 18, a monitor TV 19, and a reference clock generator 20. And the character data output from the character generator 14 are superimposed, and after this processing, D / A1
In FIG. 7, after being converted back into an analog signal, it is supplied to the A side of the changeover switch 32, and the LPF 1
After being band-limited by 8, it is input to the monitor TV 19. Reduced images are displayed on the monitor television 19 in multiple screens, and index numbers are superimposed on these reduced images. The reference clock signal generator 20 forms a clock signal for timing the operation of the character generator 15 and the D / A 17. The clock signal supplied to the character generator 14 is supplied to the address control circuit 9 as a read clock signal. Reference numeral 21 is a pilot signal generator (OSC) that generates a pilot signal, and supplies the pilot signal to the cue head 24 via a recording amplifier 22 and a switch 23. The cue head 24 records the pilot signal on a cue track 25t (see FIG. 2) of a magnetic tape (hereinafter referred to as tape) 25 on which a composite color television signal is recorded, or records it on the cue track 25t. Playing the pilot signal. A reproducing amplifier 26 amplifies the pilot signal reproduced by the cue head 24. Reference numeral 27 denotes an envelope detector, which monitors the envelope of the reproduction signal selected by the switch 28 or the reproduction pilot signal from the reproduction amplifier 26. Reference numeral 29 denotes a 4f pilot signal detector, which detects a well-known 4f pilot signal superimposed on the reproduction signal. 30 is an ATF lock detection circuit,
A stable tracking state of a video head (not shown) is detected based on the 4f pilot signal detected during normal reproduction, and when the tracking is stable, a lock detection signal is output to the servo syscon circuit 12. 31 is a capstan motor system including a capstan motor and a motor drive circuit, the tape running speed is based on a well-known FG pulse, etc.
The servo system control circuit 12 controls the normal reproduction and the high speed search, and the envelope detector 27 detects the head of the screen group and the envelope detection signal switches the high speed search to the normal reproduction. FIG. 2 schematically shows a signal recorded on the tape 25.
Cue track 25 on the upper edge of this magnetic tape 25
t is the other part (video area, Video-A to Video
-I) has a video track 25v formed diagonally, and the cue track 25t has an index pilot signal (C
UE-A to CUE-I) are recorded, and a video signal is recorded so that the head of each screen group (scene A to scene I) is positioned on the video track 25v corresponding to the position where this signal is recorded. There is. Next, the operation will be described. First, the display of each screen group recorded on the tape and the character data of each screen group will be described. When a high speed search is selected by loading a tape cassette (not shown) in the VTR and operating the operation unit 13, the changeover switch 32 is connected to the A side in the drawing by the servo system control circuit 12 and the tape is reproduced at high speed. . And here, connect the switch 28 to the C side in the figure,
With the cue head 24 and the envelope detection circuit 27,
When the index pilot signal, for example, the index pilot signal CUE-A is detected, the capstan motor system 31 is switched from the high speed search to the normal reproduction by the servo syscon circuit 12, and the normal image reproduction is started. After switching to normal playback, the ATF lock detection circuit 30
When the locked state is detected in and the lock detection signal is output, the image reduction processing unit 1 subjects the image signal of the head portion of the scene A to 1 field subtraction processing to reduce it to 1/9 image data, This reduced image data is written in the field memory 8. On the other hand, when switched to normal reproduction, the count value of the counter 10 (for example, 001) is written in the memory 11 by the servo syscon circuit 12 as index data. Then, based on the index data read from the memory 11, the character data output from the character generator 15 and the reduced image data read from the field memory 8 are superimposed by the superimposing circuit 16. , The reduced image of the scene A is displayed in the center of the monitor TV 19, and the count value, that is, the index number, is displayed below the reduced image.
001 is superimposed (see Figure 4). Third
The timing chart of this operation is shown in the figure. The reduced image data of the scene A is stored in the field memory 8.
Further, when the index data of the scene A is stored in the memory 11 and the reduced image of the scene A in which the index data 001 is superimposed is displayed on the monitor TV 19, the servo syscon circuit 12 switches to the high speed search. , Again, the tape is played back at high speed. Then, by repeating the above operation, the reduced images from the scene B to the scene I in which the index data are respectively superimposed are sequentially displayed at a predetermined position on the monitor television screen shown in FIG. As can be seen from FIG. 4, the index data of each scene is as follows: Scene A …… 001 Scene B …… 023 Scene C …… 047 Scene D …… 091 Scene E …… 112 Scene F …… 156 Scene G …… 191 Scene H ... 253 Scene I ... 305. Next, the cueing operation of an arbitrary screen group will be described. For example, in order to cue the scene C shown in FIG. 4, the operator first visually recognizes the scene C from the nine reduced images displayed on the screen of the monitor TV 19 and displays the scene C. The attached index data (047) is read, and then the index data (047) is keyed in from the operation unit 13 to select the high speed search. Then, the tape 25 runs at a high speed, and at the same time, the counter
Counting is started by 10, and the count value of the counter 10 and the index data (04
7) and are compared and calculated by the servo syscon circuit 12. Then, when the value of the counter 10 becomes (047) and coincides with the index data, the servo system control circuit 12 switches to the normal reproduction and at the same time, the changeover switch 32 is connected to the B side, and the scene C shows the screen of the monitor TV 19. Fully projected. If the tape does not have a cue track, or if the index pilot signal is not recorded, the switch 28 is connected to the D side in the figure, and the envelope of the reproduced signal is monitored by the envelope detector 27. If the envelope changes abruptly, it is determined that this portion is a seam of the screen group, and the capstan servo system 31 is switched from the high speed search to the normal reproduction by the servo syscon circuit 12 as described above. [Effects of the Invention] As described above, according to the present invention, a desired image signal is selected by a very simple operation of manually selecting a specific reduced image from a plurality of reduced images displayed together with the count value. Thus, it is possible to obtain an image signal reproducing device capable of searching and reproducing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram schematically showing signals recorded on a magnetic tape, and FIGS. 3 (a)-(d). ) Is a timing chart for cueing, and FIG. 4 is a diagram showing an example of a reduced image displayed on a monitor television. 1 Image reduction processing unit 8 Field memory 9 Address control circuit 10 Tape counter 11 Memory 12 Servo syscon circuit 15 Multi-screen projection unit 25 Magnetic tape

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Tadayoshi Nakayama               770 Shimonoge, Takatsu-ku, Kawasaki-shi Canon               Tamagawa Works Co., Ltd. (72) Inventor Toshiyuki Masui               770 Shimonoge, Takatsu-ku, Kawasaki-shi Canon               Tamagawa Works Co., Ltd.                (56) References Japanese Patent Laid-Open No. 63-2186 (JP, A)                 JP-A-56-154885 (JP, A)                 JP-A-60-134679 (JP, A)

Claims (1)

(57) [Claims] A device for reproducing a recording medium in which a large number of image signals are recorded together with a plurality of index signals, wherein a counter for counting the amount of conveyance of the recording medium, and a plurality of counters for reproducing the index signals from the large number of image signals Image signal of which the counter value is added as a character to a plurality of types of reduced images by reproducing the image signal of each of them and writing each to the memory as a reduced image and extracting the count value of the counter each time the index signal is reproduced. Forming means for forming an image, a selecting means for manually selecting a specific reduced image from the plurality of reduced images displayed together with the count value, and an image signal corresponding to the selected reduced image. Search by comparing the count value displayed with the reduced image displayed with the count value of the counter An image signal reproducing apparatus comprising: a search unit for reproducing.