JPS60103795A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the delay of a color difference signal at the time of dubbing by making the kind of the recording color signal and the kind of the color signal on the reproducing device side equal in the recorder in which image signals are divided into luminance signals and color signals. CONSTITUTION:Image signals are divided into luminance signal and color signals, in addition, they are divided into two kinds of color difference signals, and they are recorded alternately every one horizontal scanning period. In order to match with the kind of the sequential color difference signal which records the reproduced color difference signal, a flip-flop 46 is initialized by the control signal of a control circuit 33 of a reproduction part 1 to match the polarity of the flip-flop 46. In this way, the delay of the color signal for the luminace signal at the time of dubbing is eliminated when the picture is processed, and the color-protrusion phenomenon can be prevented when this is projected on a television receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording and reproducing apparatus that records a video signal by dividing it into a luminance signal and a color signal.

Conventional configuration and its problems A video signal from a television broadcast or a video camera is divided into a luminance signal and a chrominance signal, and the chrominance signal is further divided into, for example, <R-
There is a method in which two types of color difference signals, a Y) signal and a (R-Y) signal, are time-division multiplexed alternately in one horizontal period to sequentially form one color signal. This can also be FM modulated and recorded on a magnetic sheet. Figure 1 shows the recording system of a conventional recording/reproducing device of this type, in which a luminance signal Y separated from a television broadcast or video camera video signal is shown.
is separated from terminal 1 into a first color difference signal @ (RY) and a second color difference signal (B-Y), and the two color difference signals Iζ are inputted from terminals 2 and 3, respectively. The control circuit 9 is a circuit that generates a control signal for sequentializing color difference signals, and the polarity is inverted every horizontal period in synchronization with the horizontal signal separated from the luminance signal by the synchronization separation circuit 40 (generates ff1 month). This signal controls the connection of the reswitch 4. The common terminal C of the switch 4 is connected to the terminal a when the output of the control circuit 9 is 'H' level, and is connected to the terminal a when the output of the control circuit 9 is 'H' level. are connected to the terminals (R-Y) in Figure 4, and (R-Y) in C.
B-Y) cross every horizontal period! The signal is time-division multiplexed (so-called line-sequential) as the fourth time, and this is modulated by the FM modulator 6. In addition, in order to identify whether the color difference signal of each horizontal period is (RY) or (B-Y) during playback, the chitria frequency of the FM wave is determined as (RY) and (B-Y). Set up differently with different covers. The luminance signal is also l1i
The two FM waves are mixed and amplified by a synthesizer 7, and a recording current is passed through a head 8 to record a signal on a magnetic sheet (or tape) 10.

The spectrum of the recording current is shown in FIG. The low frequency side is the FM wave of the color signal, corresponding to (RY) and (B-Y),
Two Kirrelia F1 and F2 occur alternately for one horizontal period.

The high-frequency side is the FM wave of the luminance signal, where ``3'' indicates the sync tip and ``4'' indicates the carrier frequency of the bow 1-peak.

The reproduction of this signal will be explained with reference to FIG. The magnetic signals 1 to 10 picked up by the head 8 are sent to the head amplifier 1.
1, and the luminance signal component is amplified by a bypass filter 12,
The color signal components are separated by a low-pass filter 17 and each is sent to a limiter 13. +8, FM demodulation is performed by FM modulators 14 and 19 to obtain a baseband signal.

The color difference signal is a signal obtained by delaying the FM demodulated signal and the 114 delay device 21 for one horizontal period (IH bright period), (R-Y)
The signal is sent by switch 23, (B-Y) signal [J switch 2
By alternately switching between the two color difference signals, the two color difference signals can be simultaneously generated. , 9, and the fourth reproduction is the color difference signal e, which is delayed by 11''. And (R-Y) signal (A) <B) (C)
..., (8-Y) as a signal (d) (b) (f)...
Two continuous color difference signals (R-Y) and (B-Y) are obtained by switching the reproduced signal d and the delayed signal e using the switches 23 and 24 in FIG. The switches 23 and 24 are controlled by a switch control circuit 22, and when the output of the amplifier 20 is (RY), the switch 23 is connected to the a side, and the switch 24 is connected to the b side. On the other hand, the amplifier 20
When the output is (B=Y), the switch 23 is connected to the b side, and the switch 24 is connected to the a side. The output of the amplifier 20 is (R
-Y) or (B-Y) is determined by the switch control circuit 22. Utilizing the difference in the number of carrier cycles between (RY) and (BY), discrimination is made based on the difference in voltage at the blanking portion of the FM detection signal. Obtained as above (
By performing quadrature two-phase modulation using the color encoder 25 using R-Y) and B-Y, an NTSC color signal can be obtained. The color signal quadrature-two-phase modulated by the color encoder 25 and the ￥i degree signal subjected to FM demodulation are sent to the amplifier 15.
mixer 16 with a predetermined amplitude and mix it with the NTS
A color video signal of the C format is output from the terminal 26 11
The above is an overview of recording and reproduction using the color difference signal line sequential recording method.

Although this method can record both the luminance signal and the color signal in FM and improve the signal-to-noise ratio of the reproduced signal, it has the disadvantage that one color difference signal is discarded every 11'' and the amount of information is halved.

When dubbing is to play back a signal recorded and played back using the above method, for example, when recording a video signal that has been synthesized by overlapping the playback signal and another video signal,
The following problems arise. This will be explained with reference to FIG.

There is no video information up to the nl-1st (1" is the horizontal period), and the color par signal from the (n -1-1)Hth
+4. > Let us take as an example the video signal shown in Figure 5a, which continues up to the Hth point. This is converted into two color difference signals (RY) and (B-Y).
decomposed into −shinogashi, c, which is expressed as < n +
1) I"th is (RY) signal, (n -1-2>
1-1 is d, which is line-sequentialized to become a (B-Y) signal. This is FM modulated and recorded/played. The reproduced signal is also d, and the signal delayed by one day is e. By switching d and e at the predetermined timing described in FIG. 3, two color difference signals (R-Y) and (B-Y) shown as f and q are obtained. This is color encoded into an NTSC signal. The above is the first recording/playback. Next, when converting this signal into color difference line method and recording it again, in the first recording, (R-Y
) in the second recording, it becomes (n+1
)I-1st is (B-Y), thereafter (RY), ([3-Y
) when re-recording, such as alternating with
If the type of color signal recorded in each horizontal period is different from that on the playback device side, the line-sequential color difference signal will be h, which will be recorded and reproduced, and the synchronized color difference signal will be 1. The signal is delayed by 11'' compared to j roar and f and 9.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a recording and reproducing apparatus that can eliminate the delay of color difference signals during dubbing as described above.

Structure of the Invention The recording and reproducing apparatus of the present invention divides a video signal into a luminance signal and a color signal, and further divides this color signal into two types of color difference signals.
The recording device is configured to alternately record each horizontal scanning period, and is configured to record the same type of color difference signal as the type of color difference signal on the player side in each horizontal scanning period. Then, when the reproduced signal is subjected to image processing such as dubbing or superimposing it with other video signals, it is recorded and reproduced again, and when it is displayed on a television, the color signal is compared to the luminance signal. The present invention is characterized in that it prevents the phenomenon of color run-out by avoiding inconvenient delays.

Description of examples Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 6, the reproducing section 11 reproduces the signal from the air signal 1, so the configuration is almost the same as that of FIG. 3. The luminance signal is subjected to FM detection of the output of the head amplifier circuit 30 by a Y signal reproducing circuit 31, and subjected to predetermined signal processing such as amplification, and then output as a C output. On the other hand, for the color signal, the output of the head amplifier circuit 30 is subjected to FM detection by the color signal reproducing circuit 32, and after predetermined signal processing such as amplification, the serialized color difference signal is successively produced by the synchronization circuit 35 according to the procedure described above. There are two color difference signals. A control signal for this synchronization is generated by the control circuit 33.

The Y signal obtained as described above and the two color difference signals are mixed in the mixing circuit 34 to produce a j-color television signal. In the image synthesis section 3, the image synthesis section 3 performs predetermined signal processing such as compositing this signal with the image of the camera 37.
6, and performs trimming, inset, superimpose, etc. Heat theory, output signal of reproduction department engineer and camera 37
The synchronization of the output signals of camera 3 must match.
The synchronization in step 7 is performed by the synchronization of the output signal of the reproduction section (1). The recording section (2) performs some processing on the output signal of the reproduction section (2) and re-records the signal. The input signal is divided N1 into the Y signal and two color difference (1g signals) by the U signal separation circuit 38, and the color difference signals are serialized in synchronization with the horizontal period by the serialization circuit 39, and are converted into FM signals by the color difference modulation circuit 43. It modulates.

The Y signal is similarly FM modulated by the Y modulation circuit 42. A flip-flop 46 controls the switches for serializing the color difference signals. This is clocked by the horizontal synchronization signal which is synchronized by the synchronization separation circuit 40, and its polarity is inverted every 1H. In order to make the reproduced sequential color difference signal match the type of the recorded sequential color difference signal, the flip-flop 4G is initialized with a control signal from the control circuit 33 of the playback section to match its polarity. These are the delay circuit 44 and the differential circuit 45. Although the delay circuit 44 is not necessarily necessary, the I! ! A! The differential circuit 45 is used to compensate for the lag in the image signal, and is a circuit that extracts the leading edge or trailing edge of the control signal from the control circuit 33 having a pulse width of 1H. This pulse is input to the flip-flop 46 for CC unialization. With the configuration described below, it is possible to make the output of the color signal reproduction circuit 32 of the reproduction section the same as the type of color difference signal of the sequentialization circuit 39 of the recording section (2).

Other embodiments are shown in FIGS. 7 and 8. In this other embodiment, the horizontal scanning line number and the type of color difference signal are always determined to be the same; for example, an even number is (R-Y), an odd number is (B- Y). The embodiment will be described with reference to FIG. 7079 in FIG. 7 and the timing chart in FIG. 8 only regarding the generation of the switch control signal. , a composite synchronization signal shown in FIG. 8A is inputted to the terminal 55. From now on, the vertical synchronization extraction circuit 50 uses an integration circuit and waveform shaping to generate the eighth signal.
Obtain the vertical synchronization signal shown in the figure. When the synchronization signal of the retriggerable monostable multivibrator 52I is triggered, the pulse width is 1H ((i3.5μs) or less < 1, / 2
), and the output waveform of FIG. 8C is 1q. The falling edge detector 53 detects this falling edge (j) in FIG. When the edge is reached, the output of the R-3 flip-flop 51 becomes e in FIG.
This is the pulse until the second half of the period. The polarity of the flip-flop 54 is inverted every 11-1 using the synchronizing signal a as a clock.
However, if the output of the R-8 type flip-flop 51, that is, the reset signal 1-sign in FIG. When the "1-" level t- reaches the "I building level", the switch control signal 56 whose polarity is reversed is obtained, and as explained in FIG.
111+1-! By doing this, it is possible to carry a determined type of color difference signal in a determined horizontal period.

"Effects of the Invention" 2 Explanation J: By using Uniki's recording and reproducing device, the type of color signal to be recorded can be made the same as the second type of color signal on the player side, so when dubbing or There is no delay with respect to the luminance signal of Color No. 13 during image processing, and when this is displayed on a television receiver, it is possible to prevent color overflow and obtain a good reproduced image.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the recording unit in the color difference line sequential system, Figure 2 is a spectrum diagram of the recording current, Figure 3 is a block diagram of the reproduction unit in the color difference line sequential system, and Figure 4 shows the sequential and simultaneous systems. Time chart for explanation - 1 - Figure 5 is a time chart diagram explaining the 1H shift in color that occurs when the reproduced color difference signal is recorded again, and Figures 6 to 8 are examples of the present invention. , FIG. 6 is a block diagram of one embodiment of the present invention, FIG. 7 is a block diagram of main parts of a second embodiment, and FIG. 8 is a timing chart diagram of FIG. 7. ■... Playback section, ■... Image composition section, ■... Recording section, 33... Control circuit, 39... Sequentialization circuit, 46,
51.56...Flip-flop 1.50...Gravity center synchronization extraction circuit, 5G...Switch control signal agent Yoshihiro Moriki

Claims (1)

[Claims] 1. The video signal is divided into a luminance signal and a chrominance signal.The chrominance signal is further divided into two types of chrominance signals, and the two types of chrominance signals are recorded alternately every horizontal scanning period. A recording and reproducing apparatus configured to record the same type of color difference signal as the type of color difference signal on the reproducing device side during the horizontal scanning period. 2. Information indicating the type of color difference signal being reproduced on the player side is transmitted from the player side to the recorder side, and based on this, the color difference signals on the recording side are sequentialized. A recording/reproducing apparatus according to claim 1, characterized in that: The recording/reproducing device according to item 1.