JPS60206385A - Recording and reproducing device of video signal - Google Patents

Abstract

PURPOSE:To prevent a disappearance of an original recorded picture where characters of a telop are inserted by recording information such as characters in some track of plural tracks where information made of characters relating to the recorded picture is desirably recorded and by projecting the characters only at the bottom of the screen on a reproduced screen. CONSTITUTION:An operator retrieves the position where a telop is subjected to be inserted viewing a reproduced picture on a monitor receiver. When the position is retrieved, a VTR is stopped at a head of the position. When, for instance, an post-recording switch AR is turned on at this time, the VTR is switched to a reproduction mode in all periods except plural horizontal sections at the end of each track, and a color video signal Sv is reproduced. When the operation is shifted to plural horizontal sections at the end of each track, it becomes a recording mode forcibly, and information of white characters prepared beforehand for these sections is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a video signal recording and reproducing device, and in particular to a technology for after-recording information related to recorded image information, such as captions such as characters and symbols such as the title of the image content. Regarding.

Background Art and its Problems For example, when an image captured by a television camera is recorded by a VTR, information related to the recorded image information, such as the title of the recorded image content, data at the time of recording, etc., is recorded in the recorded image in the form of characters, etc. If you want to insert and display the characters, it is common practice to after-record the data such as characters.

Conventionally, the common method for this after-recording is to use a device called a digital telosono.

Figure 1 shows the after-recording method when using this digital captioner, and this method requires dubbing.

That is, prepare two VT ROIs and (20), load a recorded tape (11) into which subtitles, etc. should be inserted into one VT RQl, set it to playback mode,
Load the raw tape (28) into the other VTR (20) and put it into recording mode. And these two V T
RQOI (20) Noma Nitigi Tarte C1 Tsuba (3
0).

In the VTRα0) which is in the playback mode, a signal is played back from the recorded tape (11) by the rotary head (12), and this signal is supplied to the amplifier (14) via the rotary transformer (13). The output is a luminance signal reproduction system (15) and a carrier color signal reproduction system (16)
is supplied to the synthesis circuit (17) via the synthesis circuit (17).
17), the reproduced color video signal is extracted. The reproduced color video signal from this synthesis circuit (17) is supplied to a digital telopper (30) via an output terminal (18).

In the digital ticker (30), a ticker signal such as white text is superimposed on this reproduced color video signal, and the superimposed signal is supplied to the input terminal (21) of the VTR (20) in recording mode. .

In the VTR (20), the signal supplied to this input terminal (21) is processed in a luminance signal recording system (22) and a carrier color signal recording system (23), respectively, and sent to a synthesis circuit (24).
The output of this synthesis circuit (24) is supplied to the amplifier (24).
5) and a rotary transformer (26) to a recording rotary head (27), and a signal in which a color video signal and this subtitle are superimposed is recorded on a tape (28).

In this way, when this tape (2B) is played back, the reproduced image will be superimposed on the original recorded image and a white text telop will appear, thereby achieving the intended purpose.

However, this method is based on dubbing, and deterioration of the color video signal is inevitable, and the entire image deteriorates because a subtitle is inserted in a portion of the image content that was recorded in good condition. It has the disadvantage that it ends up being

Therefore, without performing such dubbing, first find a period for multiple tracks in which you want to insert a subtitle, and then use a camera to capture a message such as "Graduation Commemoration" during this period, and record the signal obtained as an insert. There are also methods to do this.

However, in the case of this method, the original recorded image disappears in the part where the text of the caption is inserted on the reproduced image, and only the image of the text captured by the camera is displayed on the flesh surface. This results in the original image being cut off at that part.

Purpose of the Invention In view of the above points, the present invention provides a method for dubbing recorded image information without dubbing that would cause image deterioration, and without erasing all image information in the part where a subtitle is inserted. The present invention aims to provide a device that can perform after-recording of information such as characters.

SUMMARY OF THE INVENTION This invention does not replace all the image information in a period for multiple tracks in which information such as characters related to a recorded image is to be recorded with information such as characters, but instead replaces all the image information with information such as characters in a period of a part of the track. etc., and the characters can be displayed on the reproduced meat surface, for example, only at the bottom of the screen.

Embodiment FIG. 2 is a diagram showing an example of a case where an example of the apparatus of the present invention is applied to a color video signal recording and reproducing apparatus of the so-called color low-pass conversion azimuth recording method.

In Figure 2, (40) is a magnetic tape on which image information has already been recorded by a camera, etc. Signals are reproduced from this tape (40) by a rotary head (41), and the output is sent to a rotary transformer (42). Also, the head amplifier (44) is connected to the head amplifier (44) through the terminal PB side of the switch circuit (43).
supplied to The output of this head amplifier (44) is supplied to a low-pass filter (45), where the carrier color signal converted to the low frequency side is taken out, and this is converted into the original carrier color signal of the subcarrier by the color processing circuit (46). It is returned and supplied to the synthesis circuit (50). Head amp (44
) is also supplied to a bypass filter (47) to extract an FM-modulated luminance signal, which is supplied to a demodulation circuit (48) for FM demodulation. This demodulated luminance signal is then sent to a de-emphasis circuit (4
9) to a synthesis circuit (50), from which a reproduced color video signal is obtained and sent to an output terminal (
51). The color video signal obtained at this output terminal (51) is then supplied to, for example, a monitor receiver to reproduce the image.

Then, while looking at this image, a search is made for a position where a subtitle should be inserted, and if that position is detected, the VTR is brought to a halt at the beginning of that position. Then, from that point on, for example, when the after-recording switch AR is turned on, the VTR enters the playback mode during a period excluding the horizontal sections at the end of each track, and the color video signal Sv (second 3A) is played.

Then, when it comes to the period of multiple horizontal sections at the end of each track, the recording mode is forced as described below.
Information in white characters prepared in advance is recorded in that portion.

That is, the reproduced luminance signal from the de-emphasis circuit (49) is supplied to the horizontal synchronization signal separation circuit (52) and the vertical synchronization signal separation circuit (53), and the horizontal synchronization signal HD and vertical synchronization signal VD are separated, respectively. and these are supplied to the timing pulse generation circuit (54). Further, a control signal indicating that the after-recording switch AF is turned on is supplied to the timing pulse generation circuit (54) by illuminating the input terminal (55).
From this, a switching signal AT (Fig. 3B) is obtained which switches the switch circuit (43) only while the switch AF is on, and this causes the switch circuit (43) to switch between multiple horizontal sections at the end of each track. Period PT″?!Terminal RP
, switched to the C side.

The plurality of horizontal sections at the end of each track correspond to the period of the plurality of lines at the bottom of the screen on the playback screen, and this portion replaces the recorded video signal with a white telop signal.

(70) is an XY matrix memory having a capacity for multiple horizontal lines for storing the character data of the subtitles to be displayed in the multiple horizontal sections. Character data has been written in advance. Then, the data of this character is transferred to the timing pulse generation circuit (54) as shown in 1 & above.
) is read out during period PT. The signal read out from this memory (70) is a white character, and is a digital signal consisting of two values: pedestal level and white level. This read data is supplied to the synthesis circuit (73), and is synthesized with a signal synchronized with the horizontal and vertical synchronization signals in the reproduced color video signal from the synchronization signal generation circuit (72) as described later. It is supplied to a low pass filter (74).

In this low-pass filter (74), during reproduction, 2.8 MHz enters the color signal demodulation system and causes color interference interference.
The above frequency components are removed, leaving only the luminance signal component. The output of this low-pass filter (74) is supplied to an FM modulation circuit (76) through a pre-emphasis circuit (75), and the FM modulation signal is supplied to a synthesis circuit (77). Then, in this synthesis circuit (77), the burst signal is synchronized with the color burst signal in the reproduced color video signal from the synchronization signal generation circuit (72) and has a phase conforming to the so-called PI method or PS method of the low-frequency conversion azimuth recording method. It is combined with the signal, and the combined output is sent to the amplifier (78
), the signal is supplied to the rotary head (41) through the terminal REC side of the switch circuit (43), and recording is performed in a plurality of horizontal section bones at the end of each track. In this case, this recording signal is only a luminance signal.

Further, in this case, the recording current during this period PT is increased to perform recording, so that it is not necessary to erase only the portion during this period PT.

In this case, reading from the memory (70) is performed in synchronization with the synchronization signal of the reproduced color video signal. However, since the switch circuit (43) is switched to the terminal REC side during the period PT, the reproduced horizontal synchronization signal HD cannot be obtained from the synchronization signal separation circuits (52) and (53) during the period PT. For this reason,
In this example, a circuit (60) for obtaining a signal synchronized with the reproduced horizontal synchronizing signal HD is provided, and a continuous horizontal cycle signal CH synchronized with the reproduced horizontal synchronizing signal HD is obtained in the following manner.

0 In other words, the output signal HD of the horizontal synchronization signal separation circuit (52)
is supplied to the phase comparison circuit (61). On the other hand, a variable frequency oscillation circuit (62) having a free-running oscillation frequency that is an integral multiple of the horizontal frequency is provided, and its output signal is transmitted to the frequency dividing circuit (63).
) from which the horizontal period signal CH (Fig. 3C
) is taken out and supplied to the phase comparator circuit (61) through the switch circuit (64). Therefore, a phase error output between the reproduced horizontal synchronizing signal HD and the signal CH is obtained from this phase comparator circuit (61), which is passed through a low-pass filter (65) to a sampling hold circuit (66).
) and its hold output is supplied to the variable frequency oscillator circuit (
62), this variable frequency oscillation circuit (62)
output is phase-locked to the reproduced horizontal synchronization signal. Therefore, the signal CH becomes a signal whose phase is synchronized with the synchronization signal HD.

Switch circuit (64) and sampling hold circuit (
66) is a circuit (60
) to prevent malfunctions, the switch circuit (64) is turned off during period PT by the signal AT from the timing pulse generation circuit (54), and an erroneous error signal is detected by the comparison circuit (61). be prevented from getting it. The signal AT from the timing pulse generation circuit (54) is also supplied to the sampling and holding circuit (66), and during this period PT, the previous sampling and holding output is supplied as is, so that the phase error output is sampled. It is prevented from being held.

The signal CH whose phase is locked to the reproduced horizontal synchronizing signal from the frequency division plane II (63) thus obtained is fed to the memory (70) and at the same time, the timing pulse generation cycle vpJ (54
) is supplied to this memory (70) as a read timing pulse. Furthermore, the vertical synchronization signal VD from the vertical synchronization signal separation circuit (53) is also transferred to this memory (
70). In this example, the recording mode is set for a period corresponding to multiple horizontal sections at the end of each track, and the vertical synchronization signal is recorded at the beginning of each track, so 1 This vertical synchronization signal VD is It can be extracted for each trunk.

The output AT of this timing pulse generation circuit (54) is
Of course, as mentioned above, since the reproduced horizontal synchronizing signal HD and the reproduced vertical synchronizing signal VD are supplied to this, the pulses are synchronized with the reproduced synchronizing signal, and the pulses are read out from the memory (70) according to the signals synchronized with these reproduced signals. will be done.

Further, the signal CH1 synchronized with the reproduced horizontal synchronizing signal from the frequency dividing circuit (63), the vertical synchronizing signal VD from the vertical synchronizing signal separation circuit (53), and the color burst in the reproduced color video signal from the color processing circuit (46). The signal is supplied to a synchronization signal generation circuit (72), from which horizontal and vertical synchronization signals and color burst signals synchronized with the reproduced signal are obtained. In this case, for the color burst signal obtained from the synchronization signal generation circuit (72), crosstalk components of the carrier color signal based on the PI system or PS system in the case of the so-called color low-pass conversion azimuth recording system are removed. Phase 3 2 control is also performed for this purpose.

In this way, on the recorded tape (40), during the period in which the telop was inserted, telop character data is recorded in some portions of each recording track T, as shown with diagonal lines in FIG. That will happen. therefore,
If this is played back, a signal with the text information of the caption inserted in the period PT as shown in Figure 3E will be obtained, and a white text caption will be displayed at the bottom of the screen on both sides of the playback. .

Note that the position where the telop character information is inserted may be any part of the screen, and is of course not limited to the bottom part of the screen in the above example.

Furthermore, although the above example is a case of recording white characters, it is also possible to store color character and graphic information in the memory (70) and read and record this in synchronization with the playback synchronization signal. Of course it's good.

Effects of the Invention According to the present invention, since dubbing is not performed when inserting a subtitle, there is no possibility of image deterioration at all.

Also, in the section where a caption is inserted, instead of recording the caption screen instead of all video signals, the caption data is inserted into a part of each track, so multiple tracks where this caption is inserted This has the advantage that all of the recorded image information will not be lost.

In addition, according to this invention, since it is not necessary to install two VTRs, or to install a separate camera to image the subtitles, and furthermore, it does not require a digital subtitle, the user can easily insert subtitles onto a recorded tape. There are remarkable effects that can be achieved.

In addition, the present invention reads information on subtitle characters from the memory in synchronization with the playback horizontal and vertical synchronization signals obtained from the playback color video signal, and adds a signal synchronized with the playback synchronization signal to the memory output. Since the data is recorded in a synchronized manner, there is almost no synchronization difference during playback.

Also, in the After 5 recording, recording is done in a time-sharing manner with tracking being maintained during playback.
This has the effect that almost no track misalignment with the previous recording pattern occurs.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a conventional after-recording method for signals related to recorded information, FIG. 2 is a block diagram of an example of the inventive device, FIG. 3 is a waveform diagram for explaining the method, and FIG. FIG. 4 is a diagram showing a recording pattern for the purpose of explanation. (41) is a rotating head, (43) is a switch circuit that is switched when switching from playback mode to recording mode during playback, (54) is a timing pulse generation circuit that obtains a timing pulse synchronized with a playback synchronization signal, (60) is a circuit that obtains a horizontal period signal synchronized with the reproduced horizontal period signal,
(70) is a memory that stores information related to recorded image information in advance; (72) is a horizontal memory that is synchronized with the reproduced video signal;
This is a circuit that generates a vertical synchronization signal and a color burst signal. 6

Claims (1)

[Claims] In a device that uses a rotating head to record video signals by forming one diagonal trunk for each unit of time and then reproduces the same, in playback mode, the video signal is recorded for each unit of time by forming one diagonal trunk, and in the playback mode, a plurality of desired tracks into which information related to the recorded image is to be inserted are recorded. During the period, a plurality of horizontal section bones of a portion of each trunk are forcibly switched to the recording mode, and the above-mentioned related information previously stored in the memory is read out during this recording mode period, and the plurality A video signal recording and reproducing device configured to perform after-recording on a bone portion in a horizontal section.