JPH0628429B2 - Video signal recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording / reproducing apparatus, and more particularly to a technology for after-recording information related to recorded image information, for example, a telop such as characters or symbols such as a title of the image content. Regarding

2. Description of the Related Art When an image taken 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 or data at the time of recording, is written in characters in the recorded image. When it is desired to insert and display the data in, the data such as the character is generally after-recorded.

As a technique for this after-recording, a method using a device called a digital teloper has been generally used.

FIG. 1 shows an after-recording method using this digital telop, which is a method premised on dubbing.

That is, two VTRs (10) and (20) are prepared, one of the VTRs (10) is loaded with a recorded tape (11) into which a telop or the like is to be inserted, and this is set to the reproduction mode, and the other VTR (10) is loaded.
The raw tape (28) is loaded on the TR (20), and this side is set to the recording mode. And these two VTRs (10) (20)
Connect the digital teloper (30) between.

In the VTR (10) in the reproduction mode, a signal is reproduced from the recorded tape (11) by the rotary head (12), and this is supplied to the amplifier (14) via the rotary transformer (13), and the amplifier (14) is supplied. ) Is supplied to a synthesizing circuit (17) via a luminance signal reproducing system (15) and a carrier color signal reproducing system (16), and the synthesizing circuit (1)
The reproduced color video signal is taken out from 7). The reproduced color video signal from the synthesizing circuit (17) is supplied to the digital telop (30) via the output terminal (18).

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

In the VTR (20), the signal supplied to the input terminal (21) is subjected to signal processing in the luminance signal recording system (22) and the carrier color signal recording system (23), respectively, and the synthesis circuit (24).
And the output of the synthesis circuit (24) is supplied to the amplifier (2
5) and the rotary transformer (26) to be supplied to the recording rotary head (27), and the color video signal and the signal in which this telop is superimposed are recorded on the tape (28).

In this way, when the tape (28) is reproduced, the reproduced image is superimposed on the original recorded image and a telop of white characters appears, so that the intended purpose can be achieved.

However, this method is premised on dubbing, and the deterioration of the color video signal is unavoidable, and the image contents recorded in good condition are all deteriorated because a telop is inserted in a part of the period. It has a drawback that it will be done.

Therefore, without performing such dubbing, first, a period for a plurality of tracks in which a telop is to be inserted is searched for, and a signal obtained by capturing a character such as "graduation anniversary" with a camera during this period is so-called insert-recorded. There is also a way to do so.

However, in the case of this method, the original recorded image disappears in the portion where the text of the telop is inserted on the reproduced image, and only the image of the character captured by the camera is displayed on the screen. As a result, the original image is interrupted at that portion.

SUMMARY OF THE INVENTION In view of the above points, the present invention relates to recorded image information without performing dubbing that causes image deterioration, and without erasing all image information of a portion where a telop is inserted. It aims to provide a device capable of after-recording information such as characters.

SUMMARY OF THE INVENTION The present invention does not replace all image information in a period for a plurality of tracks for which it is desired to record information such as characters related to a recorded image with information such as characters, but does not replace characters in a part of the track. Is recorded on the reproduction screen so that the characters and the like can be displayed only on the lower part of the screen.

Embodiment FIG. 2 is a diagram showing an example in which an example of the device of the present invention is applied to a recording / reproducing device of a color video signal of a so-called color low frequency conversion azimuth recording system.

In FIG. 2, reference numeral (40) is a magnetic tape on which image information has already been recorded by a camera or the like, a signal is reproduced by the rotary head (41) from this tape (40), and the output thereof passes through the rotary transformer (42). Via the terminal PB side of the switch circuit (43) and the head amplifier (44)
Is supplied to. The output of the head amplifier (44) is supplied to the low-pass filter (45) to extract the carrier color signal converted to the low frequency side, and this is converted into the carrier color signal of the original subcarrier by the color process circuit (46). It is returned and supplied to the synthesis circuit (50). Head amplifier (4
The output of 4) is also supplied to a high-pass filter (47) to extract an FM-modulated luminance signal, which is supplied to a demodulation circuit (48) for FM demodulation. Then, the demodulated luminance signal is supplied to the synthesizing circuit (50) via the de-emphasis circuit (49), the reproduced color video signal is obtained from the synthesizing circuit (50) and is output to the output terminal (51). It And this output terminal (51)
The color video signal obtained in the above is supplied to, for example, a monitor receiver to reproduce an image.

Then, the position where the telop should be inserted is searched while looking at this image, and if that position is detected, the VTR is stopped at the first position of that position. Then, when the after-recording switch AR is turned on from that point on, the VTR enters the reproduction mode in a period excluding a plurality of horizontal sections at the end of each one track, and the color video signal Sv (first 3 A) is reproduced. Then, in a period for a plurality of horizontal sections at the end of each one track, a recording mode is forcibly set as described later, and white character information prepared in advance is recorded in that portion.

That is, the reproduction luminance signal from the de-emphasis circuit (49) is supplied to the horizontal sync signal separation circuit (52) and the vertical sync signal separation circuit (53) to separate the horizontal sync signal HD and the vertical sync signal VD, respectively. Obtained, 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) through the input terminal (55), and the switch signal is switched only while the switch AF is turned on. Switching signal AT for switching the circuit (43) (FIG. 3B)
As a result, the switch circuit (43) is switched to the terminal REC side in the period PT of a plurality of horizontal sections at the end of each track.

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

Reference numeral (70) is an XY matrix memory having a capacity of a plurality of horizontal lines for storing character data of a telop to be displayed in the plurality of horizontal sections, and this memory (70) is predetermined by the user from the input device (71). The character data is written in advance. Then, the data of this character is, as described later, the timing pulse generation circuit (54).
Is read in the period PT by the signal from. The signal read from the memory (70) is a white character, which is a digital signal composed of binary values of a pedestal level and a white level. This read data is stored in the synthesis circuit (7
3) and is supplied to the low pass filter (74) by being combined with a signal from the sync signal generating circuit (72) which is synchronized with the horizontal and vertical sync signals in the reproduced color video signal as described later. This low-pass filter (7
In 4), at the time of reproduction, the frequency component of 2.8 MHz or more that enters the color signal demodulation system and causes color interference is removed,
Only the luminance signal component is used. This low-pass filter (7
The output of 4) is F through the pre-emphasis circuit (75).
The FM modulation signal supplied to the M modulation circuit (76) is supplied to the synthesis circuit (77). And this synthesis circuit (7
In 7), the so-called PI system or P of the low-frequency conversion azimuth recording system which is synchronized with the color burst signal in the reproduced color video signal from the synchronization signal generation circuit (72)
It is combined with a burst signal having a phase conforming to the S system, and the combined output is passed through an amplifier (78) to a switch circuit (4
It is supplied to the rotary head (41) through the terminal REC side of 3), and recording is performed in a portion corresponding to a plurality of horizontal sections at the end of each track. In this case, this recording signal is only the luminance signal.

Further, in this case, the recording current is increased during the period PT to perform recording so that only the portion of the period PT need not be erased.

In this case, the reading from the memory (70) is performed in synchronization with the sync signal of the reproduced color video signal.
However, since the switch circuit (43) is switched to the terminal REC side in the period PT, the reproduction horizontal synchronizing signal HD cannot be obtained from the synchronizing signal separation circuits (52) and (53) in the period PT. Therefore, in this example, a circuit (60) for obtaining a signal synchronized with the reproduction horizontal synchronization signal HD is provided, and the reproduction horizontal synchronization signal H is obtained as follows.
A signal CH having a continuous horizontal period synchronized with D is obtained.

That is, the output signal HD of the horizontal sync signal separation circuit (52)
Is supplied to the phase comparison circuit (61). On the other hand, a variable frequency oscillating circuit (62) having a free-running oscillating frequency that is an integral multiple of the horizontal frequency is provided, and its output signal is a frequency dividing circuit (6).
3) and the signal CH (FIG. 3C) having a horizontal period is extracted from this signal and is supplied to the phase comparison circuit (61) through the switch circuit (64). Therefore, a phase error output between the reproduction horizontal synchronizing signal HD and the signal CH is obtained from the phase comparing circuit (61), which is passed through the low pass filter (65) to the sampling and holding circuit (6
6) and its hold output is supplied to the variable frequency oscillation circuit (62), and the variable frequency oscillation circuit (6)
The output of 2) is phase-locked to the reproduction horizontal synchronizing signal. Therefore, the signal CH becomes a signal that is phase-synchronized with the synchronization signal HD.

The switch circuit (64) and the sampling and holding circuit (6
6) is a circuit (60) for obtaining the signal CH of this horizontal period because the reproduction horizontal synchronizing signal is not obtained in the period PT
The switch circuit (64) is turned off during the period PT by the signal AT from the timing pulse generation circuit (54), and an erroneous error signal is obtained from the comparison circuit (61). To be prevented. Further, the sampling hold circuit (66) is also supplied with the signal AT from the timing pulse generation circuit (54) so that the sampling hold output up to that point is supplied as it is during this period PT, and the phase error output is sampled. It is designed not to be held.

The signal CH thus phase-locked to the reproduced horizontal synchronizing signal from the frequency dividing circuit (63) is supplied to the memory (70), and the signal AT from the timing pulse generating circuit (54) is used as a read timing pulse in this memory. (70). Further, a vertical sync signal separation circuit (5
The vertical synchronizing signal VD from 3) is also supplied to this memory (70). In the case of this example, the recording mode is set for a plurality of horizontal sections at the end of each track, and the vertical synchronization signal is recorded at the beginning position of each track.
This vertical synchronizing signal VD can be extracted for each track without fail.

The output AT of this timing pulse generation circuit (54) is
Of course, as described above, since the reproduction horizontal synchronizing signal HD and the reproduction vertical synchronizing signal VD are supplied thereto, it is a pulse synchronized with the reproduction synchronizing signal, and is read from the memory (70) in accordance with the signals synchronized with these reproducing signals. Will be done.

Further, the signal CH synchronized with the reproduced horizontal synchronizing signal from the frequency dividing circuit (63), the vertical synchronizing signal VD from the vertical synchronizing signal separating circuit (53), and the color in the reproduced color video signal from the color process circuit (46). The burst signal is supplied to the synchronizing signal generating circuit (72), from which the horizontal / vertical synchronizing signal and the color burst signal synchronized with the reproduction signal are obtained. In this case, for the color burst signal obtained from the synchronizing signal generating circuit (72), the crosstalk component of the carrier color signal conforming to the PI method or PS method in the case of so-called color low frequency conversion azimuth recording method is removed. Phase control is also performed for this purpose.

In this way, the data of the telop character is recorded on the part TD of each recording track T in the part where the telop is inserted in the recorded tape (40) as shown by hatching in FIG. It will be. Therefore,
When this is reproduced, as shown in FIG. 3E, a signal in which the character information of the telop is inserted is obtained in the period PT, and a white telop is displayed in the lower part of the screen on the reproduction screen. .

It should be noted that the position at which the text information of the telop is inserted has only to be a part of the screen, and is not limited to the lower part of the screen in the above example.

In the above example, a white character is recorded, but color memory and graphic information may be stored in the memory (70) and read and recorded in synchronization with the reproduction synchronization signal. Of course good.

EFFECTS OF THE INVENTION According to the present invention, since dubbing is not performed when inserting a telop, image deterioration does not occur at all.

Also, in the section in which the telop is inserted, instead of recording the telop screen in place of all video signals, the telop data is inserted in a part of each track. There is an advantage that all of the information of the recorded image of does not disappear.

Further, according to the present invention, two VTRs are provided, or a camera for picking up a telop is separately provided, and since a digital telop is not required, the user can easily insert the telop into the recorded tape. There is a remarkable effect that it can be done.

In addition, the present invention reads the information of the telop character from the memory in synchronization with the reproduction horizontal and vertical synchronization signals obtained from the reproduction color video signal, and adds the signal synchronized with the reproduction synchronization signal to the memory output. Since the recording is performed by the recording, there is almost no synchronization deviation during reproduction.
Further, in after-recording, since recording is performed in a time-divisional manner while tracking during reproduction is being performed, there is an effect that track deviation from the previous recording pattern hardly occurs.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a conventional method of after-recording a signal related to recorded information, FIG. 2 is a block diagram of an example of the device of the present invention, FIG. 3 is a waveform diagram for the explanation, FIG. 4 is a diagram showing a recording pattern for the explanation. (41) is a rotary head, (43) is a switch circuit which is switched when the reproduction mode is changed from the reproduction mode to the recording mode, (54) is a timing pulse generation circuit which obtains a timing pulse synchronized with the reproduction synchronization signal, (60) Is a circuit for obtaining a signal of a horizontal cycle synchronized with the reproduced horizontal cycle signal,
(70) is a memory in which information related to the recorded image information is stored in advance, (72) is horizontal in synchronization with the reproduced video signal,
It is a circuit for generating a vertical synchronizing signal and a color burst signal.

Claims (1)

[Claims] 1. A rotary head for recording and reproducing a video signal by forming one diagonal track for each unit of time, and reproducing the track. In response to a command to start after-recording, the reproduced video signal is reproduced. Timing pulse generating means for generating a pulse synchronized with the separated first horizontal synchronizing signal and vertical synchronizing signal, storage means for storing information related to a recorded image, and insertion of the above related information in the reproduction mode. Switching means for switching to a recording mode by a control signal from the timing pulse generating means for a plurality of horizontal sections of a portion of one track in a desired plurality of tracks, and during the recording mode Means for generating a second horizontal synchronizing signal synchronized with the horizontal synchronizing signal separated from the reproduced video signal; Above read the related information second
And a means for adding a horizontal synchronizing signal of the above, the related information is after-recorded in a plurality of horizontal sections of a portion of each one track by the second horizontal synchronizing signal in the recording mode period. Recording / reproducing apparatus for video signals.