JPS60212092A - Reproducer of picture information - Google Patents

Abstract

PURPOSE:To eliminate a delay of a chrominance signal and a black and white video signal and to obtain satisfactory reproduced picture information by providing a delay circuit for delaying the reproduced black/white video signal by one horizontal scanning period. CONSTITUTION:The 3rd delay circuit having one-hour delay time is inserted between the 1st FM demodulator 12 and an adder 22. An output signal (e) of the demodulator 12 is delayed by one hour by means of a delay circuit 23, which outputs a signal (l). Assuming that a color difference signals Rn and (Bn-1+ Bn+1)/2 are outputted to respective terminals of a switch circuit 18, a synthesized carrier chrominance signal is added to a Y signal component outputted from the circuit 23 by means of the adder 22 and a composite video signal is outputted, said Y signal component is Yn, which is the same as the relation between an output Y signal and an output color difference signal of a matrix circuit at the time of recording. Thus the composite video signal never has the time delay of the chrominance signal and the video signal.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an image information reproducing device, and in particular, to a magnetic disk such as an electronic camera, which was published in the Technical Bulletin of the Television Society of Japan on March 25, 1981. The present invention relates to an image information reproducing device on the reproducing side of an apparatus that records and reproduces television signals as an information medium.

[Prior Art] FIG. 1 is a schematic block diagram showing the electrical configuration of a recording side circuit of an electronic camera as an example of a device that generates image information to be processed by a conventional image information reproducing device.

First, the configuration of the recording circuit of an electronic camera will be explained with reference to FIG. An optical image of a subject (not shown) of an electronic camera captured by an optical lens 1 is formed on an optical JR conversion element 2 which is a solid-state m-image element using a tube type or a semiconductor. This input optical signal is converted into an electrical signal by the photoelectric conversion element 2 ), and is provided to the matrix circuit 3 . Furthermore, the matrix circuit 3 converts this electrical signal into a Y signal, which is a black and white video signal component of a television signal, and a Y signal, which is a black and white video signal component of a television signal.
The color difference signals R-Y and B-Y are converted into two types of color difference signals RY and B-Y. Two types of color difference signals R-Y (I) and B-Y are applied to two input terminals of the switch circuit 40. The switch circuit 4 is
This is a switch circuit that alternately selects and outputs one input signal every horizontal scanning period. The color difference signal selected by the switch circuit 4 is FM-modulated by the first FM modulator 5 and then given to the adder 7. On the other hand, the Y signal output from the matrix circuit 3 is
After being FM modulated by M modulator 6, it is applied to adder 7. In the adder 7, the output signal of the first FM modulator 5 and the output signal of the second FM modulator J6 are frequency-multiplexed, supplied to the recording magnetic head 8, and recorded on the magnetic sheet 9.

FIG. 2 is a diagram for explaining the conversion of color difference signals performed by the recording circuit of the electronic camera shown in FIG.

Next, the operation of the recording circuit of the electronic and IJ camera shown in FIG. 1 will be explained with reference to FIG. FIG. 2(a) shows the video signal component Y of white fish output from the matrix circuit 3 in FIG. 1, and FIG. 2(b) shows the color difference signal RY output from the matrix circuit 3. , Figure 2 (C
) is the color difference signal @B output from the matrix circuit 3 as well.
-Y is shown. Figure 2 (a), (b) and (c)
Each signal component shown in is generated continuously during an arbitrary horizontal scanning period, and the Y signal component occurring during the nl-th horizontal scanning period is denoted by Y. and the color difference signal R-Y is Bn,
The color difference signal B-Y is B. shall be. Furthermore, the Y signal generated in the (n+1)th horizontal scanning period is designated as Yn++, the color difference signal R-YeRn++, the color difference signal B-Y is designated as B II+1, and the numbers of the corresponding horizontal scanning periods are similarly designated. I will attach it and show it.

From the matrix circuit 3, these 281 class color difference signals (b) and (0) are outputted as one unit and simultaneously. These 2i1tM color difference signals are input independently to the two input terminals of the switch circuit 4, but the switch circuit 4 alternately selects and outputs these color difference signals every horizontal scanning period. , switch circuit 4
The output becomes a color signal as shown in FIG. 2(d). For example, in the n-th horizontal scanning period (switch 4
If R1 is selected and output, an is not transmitted, and accordingly, in the next (n+1)th horizontal scanning period, BI and Y1 are output, and Rh++ is not transmitted. That is,
As a result, the manual color signal information of the original information 1 is recorded on the magnetic sheet 9.

FIG. 3 is a schematic block diagram showing the electrical configuration of a conventional image information reproducing device that reproduces the Y signal and color signal recorded on the magnetic sheet 9 by the recording circuit of the electronic camera shown in FIG. .

Next, the configuration of the image information reproducing apparatus shown in FIG. 3 will be explained. On the magnetic sheet 9, a Y signal component as shown in FIG. 2(a) and a 2ili type color difference signal are arranged alternately for each horizontal scanning period, and colors as shown in FIG. 2(d) are arranged. It is assumed that the signal information is FM modulated and recorded. These image information are reproduced by the magnetic head 10, the first filter circuit 11 selects the Y signal information band, and the second filter circuit 13 selects the color signal band. Roughly, the output signal of the first filter circuit 11 is FM demodulated by the first FM demodulator 12, and the Y signal component at the time of recording is reproduced.

On the other hand, the output signal of the second filter circuit 13 is transmitted to the second FM
The demodulator 14 demodulates the FM, and the second FMw&[1
14(7) Output reproduces the color signal at the time of recording shown in FIG. 2(d)k: tl. The output of this second FM demodulator 14 is
First delay circuit 15 having a delay time of one horizontal scanning period
The output of the first delay circuit 15 is further applied to a second delay circuit 16 having a delay time of one horizontal scanning period. The output of the second delay circuit 16 is given to an adder 41117 together with the output of the second FM demodulator 14, and the adder 17 outputs the output signal of the second delay circuit 16 and the second FM
The average value with the output signal of @key fj14 is outputted and applied to one input terminal of a switch circuit 18 having two input horn terminals. Further, the output of the first delay circuit 15 is applied to the other input terminal of the switch circuit 18 . In the switch circuit 18, the color signals respectively applied to the two inputs are switched alternately every horizontal scanning period, one continuous color difference signal of class II is output from one output terminal, and the other continuous color difference signal is output from the other output terminal. The other type of continuous color difference signal is outputted from the . For example, one output terminal of the switch circuit 18 continuously outputs the color difference signal RY, and the other output terminal continuously outputs the color difference signal @8-Y. One output of the switch circuit 18 is given to the first balanced modulator 19, and the other output is given to the second balanced modulator 2o.

In the first balanced modulator 19 and the second balanced modulator 20, an information carrier wave (for example, 3.58 MHz in the case of the NTSC system) is modulated by the input color difference signal. At this time, the phase of the carrier wave for the color difference signal @RY is different from the phase of the carrier wave for the color difference signal B-Y by 90''.

Furthermore, the first balance degree &I device 19 and the second balance degree g
Each color difference signal received by the converter 20 is added Il.
The signals are added together by the receiver 21 and sent to the adder 822 as a carrier color signal. Add 1! In the IX unit 22, the first FM (I tone @1
The Y signal output from 2 and the above-mentioned carrier color signal are added and output as a composite television signal.

FIG. xi4 is a diagram for explaining the conversion of color difference signals performed by the conventional image information reproducing apparatus shown in FIG.

Next, the operation of the conventional image information reproducing apparatus will be explained with reference to FIG.

Figure 14 (c) is xi's FM! 111112FFM
FIG. 4(r) shows the state of the m-tuned Y signal component.
WE 2 ノFM fM m N 14-C4! 1
This is a 16° letter color A M H (1) state, and two types of color difference signals @R-Y and B-Y are shown being arranged alternately for each horizontal scanning period. For example, the first F
When Y r+ is being output to the output of the M repeater 12, the color difference signal Rh is simultaneously being output to the output of the second FMItill 4, and the Y signal and the color difference signal are the same as during recording. It is played at the right time.

This signal @(f) is delayed by one horizontal scanning period in the first delay circuit 15, and the first delay circuit 15 is as shown in FIG. 4(g).
Outputs the signal shown in This signal (Q) is further
The delay circuit 16 delays the second horizontal scanning period by one horizontal scanning period.
The delay circuit 16 outputs the signal shown in FIG. 4(h).

Further, the output signal <1> of the second FM decoder 14 and the output LH bow (h) of the second delay circuit 16 are added to the adder 17, and the adder 17 is shown in FIG. 4(1). A signal of the average value of these two signals ('') and (h) is outputted. For example, the output signal (11) of the first delay circuit 15
or Ro, the output signal (f) of the FM demodulator 14 is the signal QBll or 1 at the beginning of one horizontal scanning period, and the output signal (h) of the second delay circuit 16 is the signal QBll or 1 at the beginning of one horizontal scanning period. Therefore, the output signal (1) of addition 613 in this case is a signal obtained by adding and averaging (i and (h)), that is, (Bn+1 +Bn-Kan)/2 bawl.

By the way, the image information reproducing device must restore the color difference 1F1N, which is transmitted alternately every horizontal scanning period, into two continuous color difference signals and generate a correct conveyed color signal. As mentioned above, the color signal recorded in the image is half of the original color information, and this truncated information must be restored during playback.

Here, in the case of television signals, there is a relatively strong correlation between the signal in any horizontal scanning period and the signals before and after that one horizontal scanning period, for example, the color difference signal B0-2 and the color difference signal B . The color difference signal B is truncated at the time of recording by averaging the color difference signals B and Y1. It is possible to create a pseudo signal corresponding to . The above-mentioned truncated color difference signal can be interpolated using this pseudo signal, and continuous color difference signals can be obtained.

Here, the output signal (1) of the above-mentioned adder 17 - (B 1
1-? I1B11-+)/2 is this color difference signal B that is not transmitted. This is a color difference signal corresponding to .

That is, as shown in FIG. 4(1), the adder 17 continuously generates and outputs a pseudo signal corresponding to the color difference signal that is truncated during recording.

Roughly speaking, this signal (i) and the output signal (g) of the first delay circuit 15 are given to two inputs of the switch circuit 18. These signals are alternately switched every horizontal scanning period, and one output terminal of the switch circuit 18 outputs a continuous color difference signal RY interpolated by pseudo 4M@ as shown in FIG. However, from the other output terminal, a continuous color difference (I ("B - Y) interpolated by a pseudo signal as shown in FIG. 4(k) is obtained.The color difference signal reproduced in this way is first balanced transformer g8 19
, the second balanced modulator 20a3 and the adder 21 to make a carrier color signal, and the adder 22 adds it to the Y signal component which is the output signal of the eleven FMI modulators 12, and outputs it as a composite video signal.

However, in the conventional image information reproducing apparatus configured as described above, the color signal component and the Y signal component are shifted by one horizontal scanning period. For example, the signal (J) output from one output terminal of the switch circuit 18
When is Rn, the signal (k) at the other output terminal is the color difference signal Bn-+ + Bn+t)/2 corresponding to Bn.
is output, and the first FMIII! )1
2 is the Y signal component Y. +1 is output. Here, in the output of the matrix circuit 3 of the recording apparatus shown in FIG. 2, the Y signal for the color difference signals Rn and Bn is Y.
. Also, on the playback device side, when adding the carrier color signal synthesized from the color difference signal R1 and (B n-+ + B n-ya1 )/2 and the Y signal to obtain a composite video signal, the The Y signal is actually Y. Must.

That is, in the conventional image information reproducing device, the color difference signal R1 and (B n-+ + B n++ ) /
The Y signal component corresponding to the carrier color signal synthesized from 2 is:
Y. Y, which is output after one horizontal scanning period. +1, and when such a composite video signal is reproduced on a television receiver, the Y signal component, that is, the black and white video 1m signal component, is reproduced with a lead of one horizontal period, that is, one scanning line, relative to the color signal. Therefore, in the reproduced image, the color appears to be protruding below the outline.

[Summary of the Invention] Therefore, the main object of the present invention is to provide an image information reproducing device that can eliminate the above-mentioned drawbacks, eliminate the time lag between color signals and black and white video signals, and reproduce correct video. It is to provide.

[Embodiment of the Invention] FIG. 5 is a schematic block diagram showing the electrical configuration of an image information reproducing apparatus which is an embodiment of the invention.

The configuration of the embodiment shown in FIG. 5 is the same as the conventional image information reproduction unit 1 shown in FIG. 3 above, except for the following points.

That is, a third delay circuit 23 having a delay time of one horizontal scanning period is provided between the first FMII device 12 and the adder 22.
is inserted.

FIG. 6 is a diagram for explaining the operation of the embodiment shown in FIG.

Next, the operation of the embodiment shown in FIG. 5 will be explained with reference to FIG. Here, FIG. 6(e) shows the first FM
The state of the Y signal demodulated by the Iall unit 12 is shown,
6(J) and (k) show the color difference signals output from the two output terminals of the switch circuit 18, and FIG. 6(1) shows the output signal of the third delay circuit 23.

In the embodiment shown in FIG.
The output signal (0) is delayed by one horizontal scanning period by a third delay circuit 23 having a delay time of one horizontal scanning period, and the third delay circuit 23 outputs a signal @(1). For example, each output terminal of the switch circuit 18 receives the color difference signal R8 and (B n-+ + B n++ ) / 2
is output, and when the adder 22 adds the carrier color signal synthesized from these color difference signals and the Y signal component output from the third delay circuit 23 to output a composite video signal, the third The Y signal component output from the delay circuit 23 is Y
. This is the same correspondence as the relationship between the output color difference signal and the output Y signal of the matrix circuit 3 during recording.

Therefore, even when such a composite video signal is reproduced on a television receiver, no time lag occurs between the color signal and the black and white video signal, and a correct video can be reproduced.

Note that in the above embodiment, the delay of the Y signal is
As shown in FIG. A similar effect can be obtained by delaying in the circuit 24.

[Effects of the Invention] As described above, according to the present invention, a color signal and a black and white video signal can be separated by a simple configuration including a delay circuit that delays a black and white video signal reproduced from a recording medium by one horizontal scanning period. It is possible to eliminate temporal and visual deviations between images and obtain good reproduced image information.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing a recording circuit of an electronic camera. FIG. 2 is a diagram for explaining the operation of the recording circuit of the electronic camera shown in FIG. 1. FIG. 3 is a schematic block diagram without showing a conventional image information reproducing device. FIG. 4 is a diagram for explaining the operation of the conventional image information reproducing apparatus shown in FIG. FIGS. 5 and 7 are schematic block diagrams illustrating one practical example of the present invention. FIG. 6 is a diagram for explaining the operation of the embodiment shown in FIG. In the figure, 1 is an optical lens, 2 is a photoelectric conversion element, 3 is a matrix circuit, 4.18 is a switch circuit, and 5.6 is an F
M modulator, 7.17, 21.22 are adders, 8, 10 are magnetic heads, 9 is magnetic sheet, 11.13 is filter circuit, 12.14 is FIVNI tone! , 15, 16, 23.
21t3m extension [i, 19.20 indicates a balanced modulator. Agent Masuo Oiwa

Claims (1)

[Scope of Claims] Image information consisting of color signals and black and white video signals in which the first color difference signal and the second color difference signal are arranged alternately every horizontal scanning period is reproduced, and the continuous An image information reproducing device that outputs a composite video signal consisting of a first color difference signal, the continuous second color difference signal, and the black and white video signal, the video information reproducing device comprising: a first color difference signal that receives the color signal and delays the second color difference signal by one horizontal scanning period; a second delay means for further delaying the output of the first delay means by one horizontal scanning period; an input signal to the first delay means and an output signal of the second delay means; a first addition means for adding and outputting an average value; a switch means for alternately switching and outputting the first delay means output signal and the first addition means output signal every horizontal scanning period; i!, comprising: a third delay means for delaying the black and white video signal by one horizontal scanning period; and a second addition means for adding the output of the switch means and the output of the third delay means. Li image information reproducing device.