JPS60194682A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate the operation for superimposed display and record, reproduce, and mix a main and a sub-picture through one device by recording marks which indicates the display start and end positions of the sub-picture previously, and detecting the marks during reproduction and perform automatic superimposed display operation. CONSTITUTION:Only the main picture is recorded on a magnetic tape 1 only at a 180 deg. part on a track 19 in the beginning. This tape is reproduced and a switch SW1 is pressed where the sub-picture is superimposed, and then a sub-picture on- off signal deciding circuit 18 sends a sub-picture on signal ST to a sub-picture on-off signal recording and reproducing circuit 17. The signal ST is recorded on a signal track 20 on the tape. A timing signal generating circuit 14, on the other hand, sends a rewinding command to a driving mechanism 15 for a specific time (t) under the command of the SW1 to rewind the tape. The circuit 14 supplies a read command to a sub-picture data storage circuit 6 the time (t) later. Previously stored sub-picture data is read out of a storage circuit 6 and recorded at a 30 deg. part on an information track 19. Then, a switch SW2 is pressed at the end scene of the superimposed display to record a sub-picture off signal EN on the track 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention 1] The present invention relates to a magnetic recording/reproducing device, and particularly to a video tape recorder capable of recording and reproducing a main image and a sub-image.

[Prior art] FIG. 1 is a block diagram of a conventional magnetic recording/reproducing device.

In the figure, an image recording circuit 3 records an image on a magnetic tape 1 using a rotary head 2. The image recorded on the magnetic tape 1 is read by a rotary head 2GL, and is supplied to an image reproduction circuit 4 to reproduce an image signal.

By the way, in video cheap recorders etc., the main
There were cases where it was desired to display a sub-image (for example, a title) superimposed on the image. In such a case, with the conventional magnetic recording/reproducing apparatus as described above, it is not possible to perform overlapping display with one apparatus. That is, a magnetic recording and reproducing device for recording and reproducing the main image and a magnetic recording and reproducing device for recording and reproducing the secondary edge are prepared, and these two magnetic recording and reproducing devices record the main image on separate magnetic tapes. The main image and the sub-image recorded on the magnetic tape are reproduced on the main image and the sub-image.

As mentioned above, in the past, in order to record the sub-image over the main image, many devices were required, which was a disadvantage. In addition, in order to display sub-images overlappingly at a predetermined scene in the main image, 8 sets of work are required, and the conventional method described above has the disadvantage that this editing work is extremely troublesome. There was also.

[Summary of the Invention] This invention was made to eliminate the above-mentioned drawbacks of the conventional system, and it is possible to record the main image and the li? An object of the present invention is to provide a magnetic recording/reproducing device that can record, reproduce, and mix images, and can display a sub-image overlaid on any scene of a main image without the troublesome editing work required in the past. shall be.

The above and other objects and features of this invention are as follows:
It will become clearer from the following detailed description with reference to the drawings.

[Embodiment of the Invention] FIGS. 2 and 3 are schematic block diagrams showing an embodiment of the invention. Note that FIG. 2 shows a circuit system for recording, reproducing, and mixing the main image and sub images;
The figure shows a circuit system for commanding the display start position and display #7' position of the sub-image.

First, the configuration of FIG. 2 will be explained. The rotating head 2 is fixed at a predetermined position on a rotating drum (not shown).

Magnetic tape 1 is on this rotating drum! Ill spirally wound. The winding angle is, for example, 210 degrees. In a normal 2-head VTR, the magnetic tape wall has an angle of +SO*. In this example, 2101
The main image is recorded or reproduced for 180 degrees of the winding angle of 1, and the remaining 30Fj1 is used for b! The configuration is such that recording and reproducing of 1111+ is performed. The rotating head 2 has a main image recording circuit 3 and a main image I! I regeneration circuit 4 is connected. These main image recording circuit 3 and main image reproducing circuit 4 have the same configuration as the image recording circuit 3 and the main image reproducing circuit 4 shown in FIG. The main image signal reproduced by 4 is given to one input of the main image/sub-image mixing circuit 5. On the other hand, the input device 12 for reproducing the sub-image 111 is used to create a sub-image to be recorded and input χ. For example, a keyboard or the like is used.The sub-I!il image fa input from the input device 12 for image reproduction is given to the sub-image data generation circuit 13, where it is converted into a digital signal. The output of the sub-image data generation circuit 13 (
One sub-image is given to the data storage circuit 6 and stored. The sub-image data successively outputted from the sub-image data storage circuit 6 is applied to a sub-image data rf encoding circuit 7 and encoded. The output of the sub-i'iil data encoding port 7 is a digital code recording time! 'Given to Ji 8 and modulated into recordable enlightenment. The output of the digital code recording circuit 8 is given to the rotary head 2 and recorded on the magnetic tape 1 by the rotary head 2.

The sub 1lil image signal recorded on the magnetic tape 1 is read by the rotary disc 2 and then demodulated by the digital code reproducing circuit 9 into the original digital code signal.

The output of the digital code reproducing circuit 9 is given to the code/image data converting circuit 10, and is converted into the original digital iii image data. The output of the code/image data conversion circuit 10 is given to the sub-image data storage circuit 6 and stored therein. The sub-image data thus reproduced from the magnetic tape 1 and stored in the sub-image data storage circuit 6 is read out and applied to the image data/uniformity signal conversion circuit 11. This image data/image signal converting circuit 11 converts the sub-image data of the applied digital signal into the original analog image signal. image data·
The output of the image signal converting circuit 11 is given to the other input of the main image/sub-plane an merging circuit 5. Further, the main image/sub-image mixing circuit 5 is supplied with a mixed display control signal 11 from a -1m image on/off signal determination circuit 16 shown in FIG. 3, which will be described later. In response to this mixed display control] double signal, the main image/sub-image mixing circuit 5 outputs the main image signal given from the main image reproduction circuit 4 and the gekiga m-jigo given from the image data/m-image signal conversion circuit 11. Mix and play the image! Output as a signal. This reproduced image signal is applied to a CRT display (not shown) and displayed. On the other hand, respective command signals of the on switch SW1 as an example of display n start point command means and the off switch SW2 as an example of display end point command means are given to the timing signal generation circuit 14. The timing signal generation circuit 14 has an on switch S.
In response to the press of W1 and the press of A switch SW2, a rewind command is given to the drive mechanism 15 of the magnetic tape 1, and a continuation command is given to the sub m1111 data storage circuit 6. Also, on switch SW1 and off switch S
Each command signal of W2 is given to a sub-image on/off signal determination circuit 16 shown in FIG.

Next, the configuration of the circuit system shown in FIG. 3 will be explained.

The magnetic tape 11 is the same magnetic tape as the magnetic tape 1 shown in FIG. The fixed head 16 is set so as to be able to trace the signal track at the top or bottom end of the magnetic tape 1. A sub-image on/off signal recording/reproducing circuit 17 is connected to the fixed head 16 . This sub-image on/off signal recording/reproducing circuit 17 generates a sub-image on signal (display amount start point signal) and a sub-image off signal (display end point signal) and supplies them to the fixed head 16.
This is a circuit for reproducing the signal read by.

A sub-picture on/off signal determination circuit 18 is connected to the sub-picture on/1718 recording/reproducing circuit 17 . The sub-image on/off signal determination circuit 18 is supplied with command signals from the on switch SW1 and the A-off switch SW2 shown in FIG. Controls generation of a sub-image off signal and a sub-image off signal. That is, when the on switch SW1 is pressed, the sub-image on/off signal determination circuit 18 detects the sub-image on/off signal recording/reproducing circuit 17.
The secondary movement aA signal is generated. Also, off switch S
When W2 is pressed, the sub-image on/off signal determination circuit 18 causes the graphic 11J-A signal recording and reproducing circuit 17 to generate a sub-image OFF signal. Furthermore, the sub-image on/off signal determination circuit 18 is read from the signal track by the fixed head 16, and! 113ml! ! It is determined whether the signal reproduced by the on/off signal recording/reproducing circuit 17 is a sub-picture on signal or a sub-picture off signal.

This determination result is given to the main image/n image mixing circuit 5 in FIG. 12 as a mixing display control number 18.

FIG. 4 shows a magnetic tape 1 recorded according to the above embodiment.
FIG. 2 is an illustrative diagram showing an example of a recording format. below,
1IJf\- of the above-mentioned embodiment will be explained with reference to FIG.

First, a sub-image to be displayed superimposed on a main image is input by operating the sub-image creation input device 12.

The sub-image data corresponding to this sub-image is generated by the sub-image data generation circuit 13 and stored in the sub-image data storage circuit 6.

Initially, only the main image is recorded on the magnetic tape 1 by the main image recording circuit 3. Here, a rotating drum (not shown)
If the winding angle of the magnetic chip 11 is 210 degrees and 1 no., as shown in FIG. 4, the main image is the information track 19.
It is recorded only in the first half of 180 degrees. Initially, no signal is recorded in the latter 30 degree portion. Next, the magnetic tape 1 on which only the main image has been recorded in this manner is played back, and the user observes the main image displayed on a CR display (not shown). Then, when the user wants to display the sub-images in an overlapping manner, the user presses the on switch SW1. By this pressing, a command signal is derived from the on switch SW1 and is applied to the timing signal generation circuit 14 and also to the sub-surface min/off signal determination circuit 18. In response to this command signal, the sub-image on/off signal determination circuit 18 detects the sub-image on/off signal recording and reproducing circuit 1.
7, a sub-image on signal ST is generated. This sub-image ANSIGN@S KING is recorded on the signal track 20 of the magnetic chip 71 by the fixed head 16 . On the other hand, the timing signal generation circuit 14 gives a rewind command to the drive mechanism 15 for a predetermined time t in response to the command signal from the on switch SW1. Therefore, the drive mechanism 15 rewinds the magnetic tape 1 by a distance corresponding to this time. When the above-mentioned time t has elapsed and the rewind command to the drive IIA mechanism 15 is completed, the timing signal generation circuit 14 gives a continuation command to the sub-image data storage circuit 6. In response to this continuous output command, the sub-image data storage circuit 6 outputs the sub-image data set in advance by the sub-image creation input device 12 and the sub-image data generation circuit 13 one after another. The read sub-image data is encoded by the sub-image data encoding circuit 7 and then modulated by the digital code recording circuit 8.
Information track 1 of magnetic tape 1 by rotating I\rad
It is recorded in the latter part of 30 degrees of 9.

The reason why the sub-image data is recorded by rewinding a little from the position where the sub-image on signal ST was recorded as described above is as follows. That is, the sub-image on signal ST is recorded on the magnetic tape 1 immediately when the switch SWI is pressed, whereas the sub-image data is recorded on the magnetic tape 1 as soon as the switch SWI is pressed.
When W1 is pressed, the data must be read from the sub-image data storage circuit 6, and complex processing such as encoding and demodulation must be performed, so that the data is not actually recorded on the magnetic tape 1. The time required to do so is a little delayed from the time when the on switch SW1 is suppressed. Therefore, the sub-image on signal ST
The recording position of the sub-image data and the recording start position of the sub-image data are misaligned. In this case, when the m1 image ON signal ST is detected during later playback and the main image and sub-image are mixed from that time,
As a result of the initial delay, it is not possible to obtain an accurate sub-image display. In order to eliminate this problem, the sub-image data is recorded a little before the recording position of the sub-image on signal @S.

Next, when the display scene of the main image reaches a scene where the overlapping display of the sub images is desired to end, the user presses the off switch SW2. Due to this suppression, a command signal is output from the off switch SW2, and is applied to the timing signal generation circuit 14 and the sub-image on/off signal determination circuit 1B. In response to this command signal, the sub-image on/off signal determination circuit 18:
Vice 1! I@ Generates a sub-image off signal EN to the on/off signal recording/reproducing circuit 17. This sub-image off signal EN is
The fixed head 16 records the signal on the signal track 20 of the magnetic tape 1, as shown in FIG. On the other hand, the timing error generating circuit 14 stops issuing a read command to the sub-image data storage circuit 6 in response to the command signal from the off switch SW2. Therefore, reading of sub-image data from sub-image data storage circuit 6 is stopped. This completes the recording of the sub-image data onto the magnetic tape 1.

Next, the operation during playback will be explained. In this case, the main image/sub-image mixing circuit 5 initially outputs only the main image reproduction signal from the main image reproduction circuit 4 as a reproduction image signal. Here, when the reproduction position of the magnetic tape 1 comes to the part of the sub-image ON signal ST, this II image A-ON signal ST is read by the fixed head 16 and sent from the sub-image ON/OFF signal determination circuit 18 to the mixed display control section. A signal is derived. In response to this mixed display control signal, the main image/sub image mixing circuit 5 converts the reproduction signal from the main image reproduction circuit 4 into ii! The sub-image signals provided from the i-image data/image signal conversion circuit 11 are mixed. Therefore, the sub-image is also displayed on the CRT display (not shown) superimposed on the main image.

As described above, since the sub-image data is recorded on the magnetic tape 1 a little before the sub-tii*on signal ST, the display timing of the WII picture is prevented from being shifted due to a delay due to signal processing. Next, magnetic tape 1
The playback position is sub ii! When the im off signal EN is applied to the recorded part, this sub-WJ image EN is transferred to the fixed head 1.
6, the sub-ms on/off signal determination circuit 1
The mixed display system m signal derived from 8 is turned off. Therefore, the main image/sub-image mixing circuit 5 stops the mixing operation and derives only the main image signal from the main image reproduction circuit 4. Therefore, only the main image is displayed on the CRT display (not shown).

In the above embodiment, the magnetic tape 1 is wound at an angle of 2.
The first half of 180 degrees out of 10 degrees is allocated to recording and reproducing the main image, and the latter 30 rx is allocated to recording and reproducing the sub 111iilIl, but the winding angle and the allocation angle can be changed arbitrarily.

Further, in the above-described embodiment, one information track 19 is divided into the first half and the second half to record the main image and the sub-image, but the present invention is not limited to this.
i! It is also possible to multiplex record the i-image and the sub-image.

[Efficacy of invention! ! ! ] As described above, according to the present invention, it is possible to record, reproduce, and mix the main image and the sub-t7J image with one magnetic recording/reproducing device. Therefore, there is no need to prepare a plurality of magnetic recording/reproducing devices and image listening equipment as in the past, and the cost for overlapping display is reduced. In addition, with this invention, it is #J i! ! A mark indicating the display start position i of the image i and a mark indicating the display end position are recorded, and during playback, the mark is detected and the sub-1 rlfi is automatically displayed. Now, the troublesome editing process used in the past is no longer necessary.

[Brief explanation of drawings]

There are 10 diagrams in FIG. 1 showing a conventional magnetic recording/reproducing device U. 2 and 3 are block diagrams showing a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 shows a main image and a sub-g! FIG. 3 shows a circuit system for recording and reproducing fiIII m (f?on signal and sub-WU 1171) signal. , FIG. 4 is an illustrative diagram showing an example of a recording format of a magnetic tape recorded according to an embodiment of the present invention. In the figure, 1 is a magnetic tape, 2 is a rotating hepard, 3 is a main image recording circuit, 4 is a main image reproducing circuit, and 5 is a main image recorder/sub ii! 1ittJ mixing circuit, 6 is a subsurface-arter storage circuit, 7 is a DI image data encoding circuit, 8 is a digital '
r'f5'3 recording circuit, 9 a digital code reproducing circuit,
10 is a code/picture stock data converting circuit, 1゛1 is m image data/
Picture (2) Im naturalization circuit, 12 is input for Gekiga llI
13 is a sub-image data generation circuit, 14 is a timing signal generation circuit, 15 is a drive mechanism, 16 is a fixed head, 17
;J sub-image on/off signal distribution reproducing circuit, 18 is sub-f
f171 On/Off signal determination circuit, 19 (J information I rank, 20 signal E rack, SWl A off switch,
SW2 is an off switch, S is a sub-image on signal, and EN is a sub-image off signal.

Claims (1)

[Claims] (1) A magnetic recording and reproducing device that records a main image and a sub-image on one magnetic tape and reproduces the main image and graphic images recorded on the magnetic tape. a main image recording/reproducing means for recording and reproducing the main image on the magnetic tape; 81 for storing sub-images to be recorded on the magnetic tape;
ill image data storage means; display start point command means for commanding the display amount start point of said one image; and in response to a command from said display start point command means, send a display start point signal to said magnetic tape. Means to record, before &! Display end point command means for commanding a display end point of a sub-graphic; means for recording a display end point signal on the magnetic tape in response to a command from the display end point command means; sub-image recording means for recording the sub-image data stored in the sub-image data storage means on the magnetic tape during a period from the command to the command of the display end point command means; Sub-image playback means for playing back separately from the main image; display start point signal playback detection means for detecting that the display start point signal has been played back when playing back the magnetic tape; Display end point signal reproduction detection means detects that the display end point signal has been reproduced; and after the display start point signal is detected by the display start point signal reproduction detection means, the display end point signal reproduction detection means detects the display start point signal. Until the display end point signal is detected, the main image signal reproduced by the main image reproducing means is mixed with the sub image signal reproduced by the sub image reproducing means and reproduced.
(2) After the command from the display start point command means, the sub-image recording means rewinds the magnetic tape a little from τ to the sub' The magnetic recording and reproducing device according to claim 1, which records the sub-image data stored in the BA data storage means on the magnetic tape. (3) The magnetic tape has a magnetic head disposed at a predetermined position. The angle A (A-
B+C) Wrapped l! Il! Recording and playback is performed, and the angle B of the winding angle A is allocated to the recording and playback of the llQ recorder recorded image, and the remaining angle C is allocated to the recording and playback of the drama picture record. The range 1st term or I- is 14 as stated in the 2nd term! Qi record playback table 14. (・1) The angle IB is l;I 1. T1801 Sad't
``There is a G1 recording device as described in the third claim. and!91L
! Information on which the image is recorded is recorded on a track different from the 1-rack, Claim Ill Item 1 L Sae i 4
Magnetic recording/reproducing vLd according to any of the paragraphs? .