JPS58161472A - Television receiver - Google Patents

Abstract

PURPOSE:To decrease the deterioration in picture quality and resolution, when line flicker is prevented by non-interlace display, by controlling the gain of a video signal of interpolated scanning lines depending on an amount of correlativity of the video signal of the scanning lines before and after the interplated scanning line. CONSTITUTION:In the figure, assuming that a video signal Si of the interlace system as shown in Figure A is applied to an input terminal 1 and the correlativity between a video signal S1 of a scanning line and a video signal S2 of the succeeding scanning line is weak in the video signal Si, for example. In this case, from a changeover switch 5 as shown in Figure B, a video signal SN1 having a double horizontal frequency, in which video signals of each scanning line of the input video signal Si are continuous for two times in the period of 1/2H. In Figure C, the video signal SN1 and a signal delayed by 1/2H are shown, and are applied to a correlation device 12, and the subtraction output is obtained at the output.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention converts an interlaced video signal into a non-interlaced video signal and supplies it to a picture tube.
Marugame's television receiver KIIIL, 41 is designed to display non-interlaced images in order to reduce deterioration in image quality and resolution.

In general, when displaying an image using the interlaced method, if there are 125 scanning lines, one field is composed of K1l-1tcB, and this is transmitted over 6011 m.
Ritsuka is restrained. Further, in order to obtain perpendicular resolution, the next field is scanned with a shift of a scan interval.

However, in this case, even though macroscopically the number of images is 60 per second, microscopically one scanning line 1 lights up every second, and the display period is m seconds. . The reason for this is that the light emission of this one scanning line is perceived visually as 7 lines, that is, there are 7 lines.

In order to reduce this line 7 distortion, the display period of one scanning line can be shortened by 1 secondxl. In this case, the display period for both the surface and the line is 1 second), so you will not feel the 0 box 7 litsuka and the twin 7 litsuka.

This horizontal frequency is doubled to perform nine times farther scanning.
The interlaced video signal has its horizontal frequency doubled, is converted into a non-interlaced video signal, and is supplied to the picture tube.

As this conversion method, the methods shown in FIG. 1, Fringe 2, and @3 have been proposed.

First, in the case shown in Fig. 1, it is assumed that the video signal of the previous scanning line and the video signal of the next scanning line are the same, and the video signal of the previous scanning line is used as an interpolation signal. This is a method of pre-prediction.

In the figure, (1) indicates an input terminal, and an interlaced video signal S1 is supplied to this input terminal (1). Further, (2) and (3) are each made of an IH memory, and the reading speed is twice the writing speed. 9, (4) and (5) are changeover switches, respectively, and their states are changed every IH (one horizontal period), and changeover switch (4) is used to switch memory (2) and (
When switched to one of 3), the self-switching switch (5)
is switched to the other side.

In the #EI diagram example, the video signal 8i supplied to the input terminal (1) is sent to the memories (2) and (3) alternately K1
As each minute is written, this message (2)
and (3), the IHK portion of the video signal written in the previous IH is read out twice from the other memory (3) and (2), and this is obtained at the output terminal (6). Therefore, in this case, the output terminal (
6) A non-interlaced video signal S trade in which the video signal of each scanning line of the Hiro video polarization S1 is repeated twice with a period of yH, and the horizontal frequency is doubled! is obtained.

In addition, what is shown in FIG. 2 is the so-called previous field pre-conditioning in which the video signal of the interpolated special scanning line is predicted to be equal to the video signal of the scanning line of the previous field, and this video signal is used as the interpolation signal. This is the method.

In the same figure, (2m) and (3A) are IH memories, respectively, and (4m) and (5m) are changeover switches, respectively. switch(
4) and (S). O9% (2B)
and (3m) are respectively IH memory, (4B) and ($1)
are selector switches), which also operate in the same way as the memories (2) and (3) and the selector switches (4) and (6) shown in FIG.

In the figure, (7) is a delay circuit having a delay amount of IV (one field interval).

(1) is a changeover switch that is switched every J, , IH, and the IH video signal read out from memory (2B) or (31) and the simulator from memory (2B) or (31). The output IH video signal is sequentially supplied to the output terminal (6) every 1H via this changeover switch (@).

In the example shown in FIG. 2, the output terminal (6) is a horizontal line in which the video signal of each scanning line of the K II tweed and the corresponding video signal of the scanning line of the previous field are obtained alternately every yH. The frequency is doubled and a non-interlaced Eirin signal 11xf is obtained.

In addition, what is shown in Fig. 3 predicts that the video signal of the scanning line to be interpolated is the arithmetic average of the scanning lines before and after it, and uses this video signal as the interpolation signal, which is the so-called arithmetic average. It's a method.

In the same figure, (2C) and (3C) are 1M memories, respectively, and (4C) and (5C) are changeover switches, respectively31)
, operates in the same way as the memory (3) and changeover switches (4) and (6) shown in FIG. Two consecutive video signals are obtained with a period of 1!-H.This video signal B is supplied to the synthesizer (2) via a delay circuit (9) having a delay amount of ±a, and this The video signal is directly supplied to a synthesizer (2), which synthesizer (7) arithmetic averages the two video signals and outputs *4, which is supplied to an output terminal (6).

Therefore, in the example in FIG. 3, the output terminal (6)
The horizontal frequency at which the video signal of each scanning line of the input Eirin signal 8i and the 9 Eirin signal obtained by arithmetic averaging of the two Eirin signals, this Eirin signal and the following video signal, are obtained alternately every TH is doubled. Kunon-interlaced video signal h! is obtained.

If the non-interlaced video signals S~SN7 with double the horizontal frequency obtained in this way are supplied to the receiver tube and double-speed scanning is performed, the area 7 image and line 7 image can be obtained as described above. I no longer feel it.

However, the above non-interlaced Eirin signal BN! A TV SpW receiver that performs double-speed scanning using ~S old has the following drawbacks.

First, in 4, which uses the nine-non-interlaced O video signal IMI obtained by the pre-prediction method shown in Figure 1, two Takitsubo lines of the same video signal continue, so in the diagonal direction 0Ill becomes step-like. This looks great in a still image, but not in a moving image.
〇-Quality deterioration O1! This causes the screen nano to become a great maximum.

Next, using the non-interlaced video signal 811f obtained by the previous field pre-VaO method shown in FIG. This is ideal for images with a strong temporal correlation, that is, still images, but for moving images, there is a time lag within the images, which deteriorates the image quality.

Furthermore, the 3rd IIl! The video signal of the interpolated scanning line is the arithmetic average of the scanning lines before and after the interpolated scanning line. , the resolution in the vertical direction deteriorates due to the integral action.

In this case, for example, the step-like appearance of the diagonal line is somewhat alleviated compared to the case of the 111th example.

These deteriorations in image quality and resolution are considered to be due to improper rounding of the interpolated scanning line video signal. For example, the Eirin signal Bxt by the pre-prediction method shown in the example of FIG.
always uses the video signal of the - scanning line even if there is no correlation between the video signal of the - scanning line and the next scanning line O video signal (for example, when there is a diagonal line). It is used as an interpolated signal.

The present invention has been successfully made in view of this point, and is capable of suppressing line flicker through non-interlaced display, thereby reducing the deterioration of image quality and resolution as described in 5 above. Hereinafter, an embodiment of a television receiver according to the present invention will be described with reference to FIG.

In FIG. 4, portions corresponding to those in FIG. 1II are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, the horizontal frequency obtained by the changeover switch (5) is doubled, and the video signal Sw! of the non-interlaced system is doubled. is one fixed terminal (ll
a) K is supplied. Here, the Eirin signal 8) II is the interlaced Eirin signal S! supplied to the input terminal (1) as described above. The video signal of each scanning line is a video signal that is repeated twice at a period of 2H. The other 0Ii1 constant terminal (11k) of this changeover switch (b) has
A blanking level O voltage VIL is supplied, and an output terminal (6) is led out from the movable terminal (lla) of this changeover switch (II).

Furthermore, the video signal 8Ml obtained from the changeover switch (5) is supplied to one input side of the correlation 5 (2), and this video signal F3N1 is! - Delayed abrasive circuit with no delay amount (
to the other input side of the correlator (2).

The correlator (2) is composed of, for example, a subtracter, and receives the video signal Sw! supplied to one and the other input sides. and ζ angle is 2H
The delayed good signal is subtracted, and the subtracted output is supplied to the changeover switch α umbrella as a changeover control signal.

In this case, the video signal 8) fl is the video signal of each scanning line of the input video signal Si' that is repeated twice with a period of IH as described above, so this video signal 8N1
When comparing this with a signal delayed by Σ■, it is found that during the video signal period (-HH) of the second scanning line where the video signal SKI ID is repeated, both input video signals 8
However, during the period (TH) of the Eirin signal of the first scanning line in which the Eirin signal 8 is repeated, the - of the input Eirin signal 81, respectively. Since it is based on the video signals of the scanning line and the previous scanning line, the two do not necessarily match. Therefore, the period correlator (6) of the video signal of the repeated first scanning line of the Eirin signal axis (■), the - scanning line of the input video signal 8i corresponding to this, and the Eirin of the previous scanning line. Depending on the signal correlator, a nine-minus calculation output is obtained. In other words, the video signal 8
During the interpolated nine-scan video signal period of M, a subtraction output corresponding to the correlation amount of the video signals of the scan lines before and after this scan line is obtained. One becomes larger and one becomes smaller, and when there is a perfect correlation, it becomes O.

When the magnitude of the subtraction output is below a predetermined level vTl (K is the input video signal 8.), the correlation between the - scanning line and the scanning line before it is strong; conversely, when it is above this level, there is no correlation. ) In the following cases, K is the movable terminal (11) of the changeover switch aI, which is one of the fixed terminals (
lla) K is connected so that the video signal S□ obtained at the changeover switch (5) can be directly obtained from the output terminal (6)K.

On the other hand, when this subtraction output is equal to or higher than the predetermined level vTII, the movable terminal (lie) of the changeover switch oe is connected to the other fixed terminal (llb), and the changeover switch (5) K is connected to the other fixed terminal (llb).
The obtained video signal 8□ is taken as the blanking level vlL. In this case, the reason why the subtracted output is equal to or higher than the predetermined level V□ is because the video signal SM
This is the period of the interpolated nine-scanning line O image signal of l, and this is when the correlation between the video signals of the scanning lines before and after this scanning line is weak.In the end, the output terminal (6) receives the interpolated video signal S□. When there is no correlation between the video signal of the scan line and the video signals of the scan lines before and after it, a blanked video signal s, □ is obtained.

Although not shown, the non-interlaced video signal 8□ with twice the horizontal frequency obtained at the output terminal (6) is
The signal is supplied to the picture tube via the signal processing circuit tube, and double-speed scanning is performed.

In the example of FIG. 4, it is assumed that an interlaced video signal Si as shown in FIG. 5A is supplied to the input terminal (1). This video signal 8. In this case, it is assumed that the correlation between the scanning line signal 81 and the scanning line signal S of the following scanning line is weak.

In this case, from the changeover switch (5), the Eirin signal of each scanning line of the input Eirin signal S1 as shown in FIG. is obtained. What is shown in FIG. 3C is a signal obtained by delaying this video signal 8N□ by 2H.

The correlator (6) receives these video signals 'Nl and -!
A good signal delayed by -H is supplied, and the subtracted output of these is obtained at the half output 11.

Therefore, in this case, the video signal S of the scanning line of the input Eirin signal town
Since the correlation between 1 and the video signal sl of the following scanning line is weak, the magnitude of the subtraction output obtained from the correlator (2) during the video signal S, O period of the 1st scanning line of video signal 8□0 is V □The above is completed, and the video signal 8 of the first scanning line is blanked. In the end, the output terminal (6) receives eight video signals as shown in the same figure, with the first scan IIO signal 81 being blanked. As is clear from the example, according to the television receiver according to the present invention, the gain of the video signal of the interpolated scanning line is controlled according to the amount of correlation between the video signals of the scanning lines before and after the interpolated scanning line. Since this is a trap, even when there is no correlation as in the past, it is interpolated as if there is a correlation, reducing deterioration in image quality due to the nine-scanning line signal. t
In this case, since the video signal of the interpolated scanning line is not obtained by arithmetic averaging of the video signal of the previous and subsequent scanning lines, there is no deterioration in the resolution in the vertical direction.

Next, FIGS. 6, 7, and 9 show other embodiments of the present invention, respectively. In these FIGS. 6, 7, and 9vA, parts corresponding to those in FIG. 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

First, #I6 shown in Figure 1 uses three IH memories. In the same figure, α◆, (2) and - are Fufu I
In many H memories, the read speed is twice the write speed. In addition, αη, (B) and (To) are changeover switches, respectively, and are switched every J) and IH (one horizontal period), and the changeover switch
When switched to (To) and (B) sides, the selector switch (
(to) is switched to memory (g), 64 and (c) IIK, and the selector switch (2) is switched to memory (c), (2).
) and - can be switched to Confucian.

In the example of FIG. 6, the video signal supplied to the input terminal (1) is stored in the memory a◆→(2)→α→→a◆...
In this way, writing is performed for each IH.

Then, memories (2), α◆, and (2) are written to the IH in which these memories α→, (to), and (2) are written.
From here, the IH portion of the video signal being written: #E Ho
It is read out twice in succession with a certain period. Therefore, from the changeover switch (to), the 11-minute video signal of the video signal S supplied to the input terminal (1) K is doubled in consecutive horizontal frequencies twice with a period of 111, and is converted into a non-interlaced system. The video signal ~ is obtained. This video signal 8□ is connected to one fixed terminal (l1m) of the changeover switch (c).
) and one input side of the correlator (2). t, memory A4, IHK written in (n and (2)), (c), @ and (
From b), the written Eirin signal t) 11 minutes is read out twice consecutively with the IH cycle. Therefore, from the changeover switch (to), the 11 minute signal of Eiso Signal Town supplied to the input terminal (1) is 2 consecutive times with ->IIO period, and the 9 water frequency is doubled. A non-interlaced 0 video signal is obtained.
It is delayed by HHX2 with respect to □ and has nine lines, and the correlator (
2) In the correlator (2), the video signal S□ supplied to one and the other input side and a signal obtained by delaying this by 2 a x 2 are subtracted, This subtracted output line switching switch αIK is supplied as the switching control signal. In this example in FIG. 6, the correlator (
6) Eirin signal 'X supplied to one and the other input side of
When comparing I and a signal delayed by THX2, the video signal S
Since Nl and the signal delayed by THX2 are the result of the video signals of the - scanning line and the previous scanning line of the input video signal S1, they do not necessarily match. Therefore, during the video signal period of the first scan line that is repeated in the video signal S A subtraction output corresponding to the correlation amount of the video signal can be obtained. In other words, a nine-point calculation output is obtained according to the amount of correlation between the video signal period of the interpolated scanning line of the video signal SN1 and the video signal of the scan line before and after the scan line. Further, a similar subtracted output can be obtained during the video signal period of the second scanning line in which the video signal swx is repeated, ie, the video signal period of the scanning line after the interpolated scanning line.

The rest of the structure is the same as the example shown in FIG.

After all, in this example of FIG. 6, the output terminal (6) K is a video signal that is ranked 1 when the video signal of 9 scanning lines is interpolated with the video signal 8Nl and there is no correlation between the video signals of the scanning lines before and after it. ) 112 is obtained.In addition, this 65th!1
In the case of the example shown in FIG. The gain of the video signal of the scan line is controlled in accordance with the correlation amount of the video signal of the scan line before and after it, and the same effect as in the example of FIG. 4 can be obtained.

Next, what is shown in FIG. 7 is that when the video signal of the first scanning line that is repeated in the video signal 8Nx, that is, the video signal of the interpolated scanning line, is blanked, the video signal of the second scanning line is The signal, that is, the interpolated scanning line signal, is amplified and strengthened to compensate for the reduction in brightness due to blanking.

In the same figure, the horizontal frequency obtained by the changeover switch (5) is doubled, and the video signal S of the non-interlace system is shown.
Nl is supplied to the first fixed terminal (20m) of changeover switch 4. The second fixed terminal (2
0b) is supplied with a voltage vlL at the planning level. Then, the movable terminal (20d
) and an output terminal (6) is derived.

In addition, the changeover switch (5) K obtains the input signal Sw1 to the gain'? : is supplied to the third fixed terminal (20) of the changeover switch via the amplifier having
'This video signal S), f is supplied to one input side of the correlator (2). On the other input side of this correlator (2),
The video signal SN0 obtained by the changeover switch (5) is supplied via a delay circuit (2) having a delay amount of IH.

In the correlator (2), the video signal SNl supplied to one and the other input signal is delayed by THX2 and a good signal is subtracted, and the subtraction output of the signal is output by a changeover switch.
is supplied as a switching control signal.

On the one and other input sides of the correlator (2), video signals ~,
And since this is supplied with a signal delayed by 5H x 2,
The subtraction output obtained from this correlator (2) is the same as in the example of FIG. That is, the video signal S□O is repeatedly viewed 1
During the period of the video signal of the second scanning line, that is, the period of the video signal of the interpolated scanning line of the video signal SH□, the correlator (b) scans the corresponding input video signal S, A subtraction output corresponding to the amount of correlation between the line and the previous scanning line, that is, the amount of correlation between the scanning lines before and after the interpolated nine scanning lines of the video signal 8□ is obtained. The magnitude of this subtraction output is 1 small when the correlation amount is large, and O when there is a complete correlation. Also, the period of the video signal of the first scanning line that is repeatedly viewed is 5NIO. In other words, a similar subtraction output is obtained in the period of the video signal of the scanning line after the interpolated scanning line.

In the changeover switch (2), the subtraction output supplied as the changeover control signal is below the predetermined level vTH (strong correlation)
When K is, the movable terminal (20d) is the first fixed terminal (20d).
0m) so that the video signal 'Ml obtained at the changeover switch (5) is directly obtained at the output terminal (6).

On the other hand, when this subtraction output is equal to or higher than the predetermined level V□ (the correlation is weak), the video signal SN obtained at the changeover switch (5)
During the period of the video signal of the first scanning line that is repeated, the movable terminal (20d) is connected to the second fixed terminal (20b).
), and the portion related to the subtraction output of the video signal of the first 0 scanning line is set to blanking level v, L, and during the period of the video signal of the second scanning line, the movable terminal (2
0d) is connected to the third fixed terminal (20@), and this
The portion related to the subtraction power of the image signal of the second scanning line is doubled by the amplifier (c) and supplied to the output terminal (6). In this case, as mentioned above, since the subtraction output is the same in the video signal period of the first and second scanning lines in which the video signal ~ is repeated, if blanking is performed in the first time, then the second time is blanked. The corresponding portion will be amplified.

In the end, the output terminal (6) outputs the video signal of the interpolated scanning line of the video signal S□ (repeated first scan ゛@0
A video signal) is blanked when the correlation between the video signals of the scanning lines before and after it is weak, and the corresponding part of the video*a of the scanning line after this interpolated scanning line is amplified. ~Is is obtained.

In the example of FIG. 7, it is assumed that an interlaced video signal S1 as shown in FIG. 8 is supplied to the input terminal (1) K. Ko0eiso signal 8. In IIc, it is assumed that the correlation between the video signal 81 of the scanning line and the video signal S3 of the following scanning line is weak.

In this case, the changeover switch (5) is used to generate a video signal in which the video signal of each scanning line of the input video signal Si as shown in FIG. ``Nl is obtained. What is shown in the same figure C is a signal in which this video signal 8..l is delayed by HX2. A good signal is supplied with a delay of 1, and the subtracted output of these is obtained as the output *.

Therefore, in this case, since the correlation between the video signal S1 of the scanning line of the input Eirin signal amount s and the following 8 times is weak, the video signal S
The magnitude of the subtracted output obtained from the phase aS(2) during the period of 8 exposures of the video signal of the first and second scanning of XI is equal to or greater than V□, and the magnitude of the subtraction output obtained from the phase aS(2) is equal to or greater than V□, and the video signal 8.
is blanked, and the video signal 81 of the second scanning line is amplified twice.

In the end, the output terminal (6) k is the Eirin signal as shown in the same figure.
) iris is obtained.

In this way, also in the example of FIG. 7, the gain of the video signal of the interpolated scanning line is controlled according to the correlation between the video signals of the scanning lines before and after it, so the same effect as in the example of FIG. 4 is achieved. Effects can be obtained. In the example shown in FIG. 7, when one of the video signals of the two repeated scanning lines of the Eirin signal supplied to the Jirin tube is blanked, the signal level of the other one is amplified. Therefore, it is possible to compensate for the decrease in brightness that occurs when blanking is applied.

Next, in the system shown in FIG. 9, the gain of the video signal of the interpolated scanning line is controlled in an analog manner according to the correlation amount of the video signal of the scanning line before and after it.

In the figure, the horizontal frequency obtained by the changeover switch (5) is doubled, and the non-interlaced signal S
□ is supplied to the input side of the variable gain amplifier (2). An output terminal (6) is led out from the output side of this amplifier.

9. The video signal 8, obtained at the selector switch (5).

is supplied to one input side of the correlator (2), and this video signal S□ is supplied to the other input side of the correlator (2) via a delay circuit 4 having a delay amount of 2 H x 20. Ru.

In the correlator (2) k, the video signal 8□ supplied to one and the other input side is delayed by 1H x 2 and subtracted from the 9-bit signal, and the subtracted output is sent to the above-mentioned amplifier). K is provided as a gain control signal.

In this case, the subtraction output obtained by the correlator (2) is the same as in the example of FIG.

First, in the example of FIG. 9, the subtraction output supplied as the amplifier EIK gain control signal is at a predetermined level v? I, hereafter (
When the correlation is strong), K is the amplification gain G is 1,
The video signal SNl obtained at the changeover switch (5) is supplied as is to the output terminal (6).

9, the subtraction power is at a predetermined level v? H2 (> v711
) or more (there is almost no correlation), the selector switch (
During the period of the video signal of the first scanning line that is repeated from the video signal obtained in 5) to □, the gain G of the amplifier So is 0, and the subtraction output of the video signal of the first scanning line is This part is blanked, and during the video signal period of the second scanning line, the gain G of the amplifier (c) is K (>1
), and the portion related to the subtracted output of the video signal of this second scanning line is multiplied by X.

Also, when the level of the subtraction output is within V□, ~V□ (there is a correlation but it is weak), the video signal of the first repeated scanning line of the video signal SNx obtained at the changeover switch (5) is During the period, the gain G of the amplifier is set to 0 (G (1), and the gain of the portion related to the subtraction output of the video signal of the first scanning line is multiplied by G and weakened. In this case, the gain of the subtraction output of the video signal of the first scanning line is The gain G1 of the polar layer width filter (2) whose magnitude is close to v?m
It is made closer to 110, which is closer to 77M2. Then, during the period of the video signal of the second scanning line, the gain G of the amplifier (2) is set to G)1, and the portion related to the subtraction output of the video signal of the second scanning line is strengthened by a factor of G. .

In this case, the magnitude of the subtracted output is v? The gain G of the layer width filter (2) close to li is made close to l.

In the end, the output terminal (6) has the video signal 81□0 interpolated scanning line video signal (repeated first scan! IO video signal), but the previous firefly scan 11AO @ video is not present. When,
Alternatively, if it is weak, blanking or the level is weakened according to the amount of correlation.This interpolated scanning @1) @1) A video signal hx4 in which the level of the corresponding part of the video signal of the scanning line is strengthened. is obtained.

In this example of FIG. 9, for example, the input terminal (1) has a first
Interlaced Eirin Signal Si as shown in Figure 0AK
is supplied and it is assumed to be 9. In this video signal S1, the part of the video signal BIO period TI of the scanning line has no correlation with the corresponding period 30 part of the video signal S3 of the scanning line that follows it, and the video signal 81 of the scanning line has no correlation with this part. It is assumed that there is a weak correlation with the video signal 8s of the subsequent scanning line.

In this case, the selector switch (5) is used to select the video signal S, as shown in FIG. ... is obtained. What is shown in tjlmc is a signal obtained by delaying this Eirin signal 8Nl by HX2. The correlator (6) is supplied with the video signal SMl and a signal delayed by -HX2,
On the output side, these subtracted outputs are obtained.

Therefore, in this case, the magnitude of the subtracted output of the correlator (A) is greater than vTII2 during the period of 1 m of the video signal S of the first scanning line of the video signal S□, so the gain G of the amplifier (A) is is set to 0, and the period tl of the first scanning line of the video signal S is blanked. Then, the period of the video signal S3 of the second scanning line corresponding to this is set to the gain GtfK (>1) of the amplifier.
The portion of the period t3 of the second scanning line signal S is intensified to perform brightness compensation. Before, during the first period tsK of the video signal 8s of the scanning line of the Eirin signal 8□, the magnitude of the subtraction output of the correlator (2) is V□, ~vTII12, so the gain of the amplifier (to) G is assumed to be 0<G<1, and ζ
The image line signal Ss of the 01st scanning line is weakened. In the period t4 of the video signal 8I of the second scanning line corresponding to this, the gain G of the amplifier (2) is G>1, and this second scanning @0 video signal 8I The brightness is enhanced and brightness compensation is performed. Furthermore, in other periods other than those mentioned above, the magnitude of the subtracted output of phase analyzer (2) is vTI
, as follows, so the gain G of the amplifier @0 is set to l, and the output terminal (6) K is supplied with the video signal SN□ obtained from the changeover switch (5).

In the end, a video signal 5NI4 as shown in the 10th IIIDE is obtained at the output terminal (6). In this way, also in the example in FIG. 9, the gain of the video signal of the interpolated scanning line is Since it is controlled according to the correlation amount of the line video signal, the same effect as the example in FIG. 4 can be obtained.

In this example, brightness compensation is performed in the same manner as in the example shown in FIG. 7, so that reduction in brightness due to gain control is prevented.

Next, FIGS. 11 and 12 show a television receiver in which a 2-beam type picture tube is used for non-interlace display, respectively. Examples of these FIGS. 11 and 12 are shown in FIG. In this case, the first beam Bm1 and the second beam Bm2 are adjacent to each other on the screen at an interval of 100, which is the scanning line interval in the interlace method, and are scanned in good condition. FIGS. 13B and 13C are diagrams showing the scanning pattern Ii of the first beam-1 and the second beam-7 on the screen (2) in odd and even fields.

When the number of scanning lines is 525, only 262.5 scanning lines are emitted in the 1-field in the 1-beam system, but in the case of the 2-beam system shown in the examples in Figures 11 and 12, The 0262.5 scanning lines in II, which would normally emit light in the next field, are emitted multiple times by scanning with the second beam 'Bo2, and all 525 scanning lines are emitted in one field. Therefore, a non-interlaced display is performed in which the display period of each scanning line is 1 second. FIG. 13 shows a V-5 scanning pattern on the screen in the 1-beam system, with solid lines representing odd fields and broken lines representing even fields.

In the beam shown in FIG. 11, the first beam-1 and the second beam Bfn2 are density-modulated with the same signal.

In the figure, - indicates an ink-lace type video signal Si.
° indicates the input terminal to which the video signal gi is supplied, and the video signal gi supplied to this input terminal (c) is passed through the signal processing circuit (2) and the amplifier (c) to the receiver tube Second
1 and 3 to the first cathode and the second cathode according to V-mu~2. Therefore, in this case, the first beam B1. and a second beam B. 2 is the same signal density-modulated. In the same figure, the wire is the synchronous separation circuit,
4 is a horizontal deflection circuit, (G) is a horizontal deflection coil, 0 is a vertical deflection circuit, and 2) is a vertical deflection coil.

Moreover, what is shown in FIG. 12 is the second 2-51.

The density modulation is performed using a signal obtained by arithmetic averaging of the video signal of the scanning line of the first beam 1t (density modulated) and the video signal of the subsequent scanning line.

In the figure, the video signal S supplied to the input terminal (c)
l is the first beam of the picture tube through 11 signal processing circuits, a delay circuit (to) with an IH delay amount, and an amplifier).
1 to the first cathode according to 1, and the first beam -
1 is density-modulated by this signal. Also, the signal processing circuit (
The video signal from (c) and the video signal from the delay circuit (to) are arithmetic averaged in a combiner (b), and the arithmetic averaged signal obtained by this combiner (b) is 2) to the second cathode of the second beam-3 of the recipient tube. Therefore, the second beam BtIm is density-modulated with a signal that is the arithmetic average of the video signal of the scanning line of the first beam BtIm, which is density modulated, and the video signal of the scanning line that follows. According to the television receivers shown in FIGS. 11 and 12, when there are 525 scanning lines, 525 scanning lines are emitted in one field, and non-interlaced display is performed, resulting in so-called line flicker. Never.

However, in the case of the example in FIG. 11, the video signal of the interpolated scanning line, that is, the video signal that density-modulates the second beam-2, is the video signal of the previous scanning line, that is, the video signal of the first beam-1. Screen (2) is the same as the video *a that modulates the density of
Since there are two consecutive scans of the video signal above,
This has the disadvantage that the diagonal lines are step-like and the image quality deteriorates. In the case of the example shown in FIG.
* No. is the image signal of the scanning line before and after it, that is, the first beam Bn1. Since this is the arithmetic average of two video signals that modulate the image signal, there is a drawback that the vertical resolution is degraded due to this integral action.

This deterioration in image quality and resolution is caused by the second V-5Bm
This is thought to be because the Eirin signal that modulated the density of 2 was not appropriate. That is, for example, in the example of FIG. 11, there is no correlation between the video signal of the scanning line of the first beam 1 modulated by the video signal of the next scanning line that follows it. This is because the second beam Bm2t is always modulated by the video signal of the scanning line.

W! FIG. 14 shows another embodiment of the present invention in which this point is taken into consideration.

In this figure, parts corresponding to those in FIG. 11 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

In the same figure, the video signal from the signal processing circuit (c) is IH
is supplied to the first cathode of the first beam-1 of the picture tube (b) via the amplifier (b), and the gain is variable. It is supplied to the second cathode associated with the beam -2 of Is2 of the picture tube (1) through an amplifier (to).

Further, the video signal from the delay circuit (2) is supplied to one input side of the correlator (2), and the video signal from the signal processing circuit (c) is supplied to the other input side of the correlator (2). Ru.

That is, this correlator is supplied with the video signal of the scanning line of the first beam 8m1t (to be modulated) and the video signal of the next scanning line.

The correlator (2) is supplied with the image signal of the scanning line that modulates the beam 1 of the irises and the video signal of the next scanning line. The subtracted output is determined according to the amount of correlation between the video signals of these scanning lines, and the smaller the amount of correlation, the larger the magnitude.

In the amplifier, the magnitude of the subtraction output supplied as a gain control signal is at a predetermined level v? When iK is less than or equal to (in this case, the correlation is strong), the gain G is the same as the gain Kr*f of the amplifier (b), and the same video signal is applied to the first cathode and the second cathode.・Also, the magnitude of the subtracted output is at the predetermined level '2112 (>
vTI, ) or more (there is almost no correlation), the gain G of the amplifier (2) is set to 0, and the video signal supplied to the second cathode Kl is blanked.Furthermore, the magnitude of the subtraction output is vTWI. ~vT12 (within this range, there is a weak correlation), the gain of the amplifier (to) aFiO<G<Ky*f, and the level of the Eirin signal supplied to the WJ2 cathode is weakened. It will be done.

The rest of the structure is the same as the example in FIG. 11.

Since the example in FIG. 14 is configured in this way, the picture tube (
b) second beam B! 112 second cathode Kl
The video signal of the scanning line supplied to the scanning line, that is, the video signal of the scanning line to be interpolated, is supplied to the video signal of the scanning line before and after it, that is, the first cathode related to the first beam -4.
When there is no correlation in the image *a of the scanning line that follows this, or when the correlation is weak, the level of K is weakened according to blanking or the amount of correlation.

In this example in FIG. 14, as shown by the broken line, the gain of the amplifier is variable, and the output related to the subtraction output of the correlation device is supplied as a gain control signal, and as described above, the tuna 2
When the video signal of the scanning line supplied to the cathode is blanked or its level is weakened according to the amount of correlation, the gain is increased and the video signal O level of the scanning line supplied to the first cathode is increased. The brightness may be increased to compensate for a decrease in brightness due to blanking or the like.

As described above, also in the example of 914, the gain of the interpolated scanning line video signal (the video signal of the scanning line that modulates the second beam) is the correlation between the video signal of the scanning line of the so+wr edge. Since it is controlled according to the amount, the same effect as the example in Figure 4 can be obtained. In the case of the example in Figure 14, a 2-bit display is assumed, assuming a black and white television receiver. 4 shows the system using the system. In the case of a single-color system, each of the red, green, and blue beams has two reeds, resulting in a 6-beam system, but the configuration can be similar to the example shown in FIG. 14.

Furthermore, among the above-mentioned embodiments, in the examples shown in FIGS. 4, 6, and 7, the Eirin signal is blanked by blanking processing, but this should be done on the side of the Aigai tube. You can also do that.

[Brief explanation of the drawing]

Figures 1 to 3 are configuration diagrams of main parts used to explain a conventional non-interlaced display television receiver, and Figure 4
The figure is a block diagram showing a dormitory example of a television receiver according to the present invention, FIG. 5 is a line diagram for explaining the example in FIG. 4, and #! 6
Figures 97, 9 and 14 are block diagrams showing other embodiments of the present invention, and Is8 and Figure 10 are diagrams of the explanations of the examples in Figures 7 and 9, respectively. , 1s11E and 41112 are configuration diagrams showing examples of conventional 2-beam type television receivers, respectively, and I/513WA is a b-line diagram for explaining the same. (1) Input terminal, (2) and (3) Hiro's IB memory, (4 bar 6) and al are changeover switches, (6) is output terminal, (2) is correlator, (2) is delay It is a circuit. 1rIA Fig. 2 1 Fig. 3 Fig. 4 t Fig. 5 Fig. 7 Fig. 8

Claims (1)

[Claims] The interlaced video signal is converted to a non-interlaced video signal and supplied to the picture tube for non-interlaced display.In the nine-television receiver, the gain of the interpolated nine-scanned video signal is calculated by scanning before and after the interlaced video signal. 9. A television V-digital receiver characterized in that the control is performed according to the correlation amount of the video signal II.