JPH02237282A - High definition television receiver - Google Patents

Abstract

PURPOSE:To reduce ringing or glitter at both edges of a picture by relaxing the amplitude change of a video signal at both edges of the picture when a video signal with a different aspect ratio is displayed. CONSTITUTION:A signal converter 73A is provided, which applies scanning conversion to signal of the high definition television system and a signal of the existing standard television system based on the vertical length of the screen of the high definition display device and generates a signal 11 controlling the contrast for a prescriber period for the start and end of the video signal within one horizontal period. In the case of displaying the picture of the existing standard television signal onto the screen 76 of the high definition television receiver, a contract adjustment circuit 12 changes the video signal at both edges of a picture gradually. Thus, the amplitude change at a boundary of the video signal is relaxed and ringing and glitter both edges of the picture are reduced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a high-definition television receiver, and particularly relates to a high-definition television receiver and a current standard television receiver having a different aspect ratio. The present invention relates to a high-definition television receiver capable of receiving John system signals.

(Prior technology) The high-definition television system is a new technology that displays high-definition images on a large screen, allowing you to enjoy beautiful images with an impact and realism that cannot be obtained with the current standard television system. It is a method.

This television system was developed by the Japan Broadcasting Corporation (Nl-I
Since it was developed and proposed by K), the aspect ratio is 1 to 16.
:9, the number of scanning lines is 1125 trees, and the current standard h formula (
(aspect ratio 4:3, number of scanning lines 525).

A conventional circuit configuration for displaying current standard television signals on a high-definition television receiver is schematically shown in FIG.

In this figure, 71 is the human power terminal of the current standard television (iM number), and 72 is the human power terminal of the high-definition television signal 3*
i: It's finished. The current standard television signal supplied to the input terminal 71 is sent to the next signal conversion station 73 (,
For example, an interlaced signal with 525 scanning lines is converted into a double-speed non-interlaced signal. A switching circuit 74 switches between this scan-converted current standard television signal and a high-definition revision signal from an input terminal 72, and a high-definition display CR is passed through a video signal processing circuit 75.
Displayed on T' 7 6. , Incidentally, the signal conversion device 7
3 is composed of a digital signal processing circuit.

Figure 8 shows the current standard television signal 8, which has undergone scanning line conversion as described above, on a CRT76 of a high-quality Brevisage 31-inch receiver.
This shows the state reflected in the image.

The screen 81 of CR176 for high-definition screen play has an aspect ratio of 16=9, and is different from the current standard bus 7 revision 'II-i with an aspect ratio of 1 to 4:3 that has undergone the scanning conversion. Since the 7 spec ratios are different, it is difficult to display them on the same screen as is. Therefore, as shown in Figure 8, the vertical length of the screen is set to 1ii]-, the horizontal length is compressed, and the horizontal length is compressed. ;'3B 2 J: A method of projecting sea urchins is being considered. Another method is to make the horizontal length of the screen the same and cut off the vertical length, but this method has the disadvantage that image information may be discarded. Therefore, it is necessary to perform aspect ratio conversion as described in FIG. 8, and this aspect ratio conversion is performed simultaneously with the scanning conversion in the signal conversion device 73 described above.

By the way, as shown in FIG. 8, when the current standard TV signal 31 is displayed, the video signal 'i-3 is not displayed on both left and right ends 83 (shaded areas) of the high-definition television screen 81. The boundary line 8/1. , 85, a3 suddenly went from having no video signal to being in trouble, and suddenly went from having other issues to disappearing. That is, the boundary line portion 8/1. , d3 to 85
It is accompanied by rapid changes. It's the two-in-one, last-in-one image that reveals the most subtle changes in people. Furthermore, since the above-mentioned scanning line conversion using the 8-speed conversion is based on digital signal processing, ringing is likely to occur at the boundary line of J:. Furthermore, the image quality adjustment circuit in the video signal processing circuit 75 performs image quality correction (contour correction) on the video signal to strengthen the T-edge portion of the video signal (11) (by applying the boundary line portion 84. There is a problem that 85 is always emphasized on J1, resulting in a grainy and unsightly image.Also, due to the bad use of the high-voltage circuit, the J: sea urchin white peak signal shown in Figure 9. Since the amplitude of the portion 91 fluctuates (spreads), the boundaries 84 and 85 are not shown at 92.93 and appear to be undulating.

Moreover, it becomes an unsightly object that moves constantly due to the pattern.

(Problems that will be solved even if the invention is solved)
Standard derebiji. When displaying 1) by converting the signal to the current standard television signal, the left and right edges of the image may be glaring and childish, or the image may be wavy and distorted depending on the image. There were problems such as

Therefore, the present invention (which is intended to eliminate the above-mentioned problem) is to improve the quality of the current standard for television receivers.
; To provide a high-definition television receiver that does not cause glare or waviness at both ends of the screen of current standard television signals when displaying -7 revision signals [-1 and - J' 6 'b's. , ``Drawing of the invention'' (Means for solving the problem) The first invention related to this high-quality television receiver is:
A high-definition television format signal and a current standard television format signal with a different aspect ratio are scan-converted based on the vertical length of the high-definition display screen, and the video signal within one horizontal period is scan-converted. Two specified periods at the beginning and end of
A signal conversion device that generates a control signal to control the signal conversion device, and a switching circuit that switches between the current standard television system signal outputted from this signal conversion device and the high-definition television system signal. It is equipped with a contrast adjustment circuit, an image quality adjustment circuit, and 1) "1
The output of the switching circuit is supplied to the display means, and when receiving the current standard television blur type signal, the control signal is The first predetermined period of the video signal within one horizontal period is gradually
- A video signal processing circuit that increases the gain of the last adjustment circuit and gradually decreases the gain of the contrast 1 - adjustment circuit during the final predetermined period.

Further, the second invention scan-converts a current standard television system signal having a different aspect ratio from that of the high-definition television system G, based on the vertical length of the screen of the high-definition display; A signal converter that generates a control signal for stopping image quality correction at predetermined periods at the beginning and end of a video signal within a cycle; , a switching circuit for switching between signals of a high-quality blur vision signal system, a contrast 1 to adjustment circuit, and an image quality adjustment circuit, and processes the output signal of the switching circuit and supplies it to a display means, When receiving a signal of the current standard television system, the control signal causes a video signal processing circuit to stop the correction operation of the image quality adjustment circuit at a predetermined period at the beginning and end of the video {Mi number within the horizontal period. It is equipped and depicted.

(Function) In the present invention, when displaying an image of the current standard television signal on the screen of a high-definition television receiver, the video signal is gradually changed at both ends of the image,
Alternatively, since the image quality adjustment of the video signal does not work at both ends of the image, the amplitude change at the boundary of the video signal becomes gentle, and ringing and glare at both ends of the image can be reduced. Further, the fluctuation in the screen amplitude due to deterioration of the high voltage regulator 1 is also suppressed because the amplitude change of the video signal becomes gradual.

(Embodiment) The present invention will be explained below based on the embodiment shown in the drawings. Fig. 1 shows a high-definition television receiver according to an embodiment of the present invention. There is ゛C. Components in FIG. 1 that are the same as those in FIG. 7 will be described with the same reference numerals.

In FIG. 1, the signal conversion device 73A converts the current standard television signal supplied from the input terminal 71 based on the vertical length of the high-definition TV signal.
It has a function of outputting a first control signal 11 (see FIG. 3(b)) indicating the video period of the current standard television signal 5 which has been converted into a signal.

This signal conversion device 73A is composed of a circuit that performs digital signal processing, and the first control signal 11 can be easily created based on various timing signals necessary for digital signal processing. Then, the converted signals output from the signal converting equipment 73△ are converted to the current standard television signal.
The switching circuit 7/4 switches the high-definition television signal input from the input terminal 72 to the video signal processing circuit 75.
Supply to A.

The video signal processing circuit 75A is a gong 1-last adjustment circuit 1.
2, the first control signal 11 from the signal converter 73A is supplied to the control terminal of the contrast adjustment circuit 12. There is.

The devision signal processed by the video signal processing circuit 75A is supplied to the high quality display CRT 76 and displayed.

FIG. 2 is a circuit diagram showing an example of the adjustment circuit 12 for the above-mentioned con 1/las 1. The adjustment circuit shown in this figure is composed of a control circuit using a double-balanced differential amplifier. That is, a video signal converted to a high-definition television system (or a video signal of a high-definition television system) is input to the input pane 31. The input terminal 31 is connected to the base of the transistor Q1, and is also connected to the base of the transistor Q2 via a resistor 1<3.

A voltage source E1 is connected to the base of the transistor Q2. Furthermore, the emitters of transistors Q1 and Q2 are connected to one potential point via resistors Rl and R2, and the collectors of transistors Q1 and Q2 are connected to a double-balanced differential amplifier (transistors Q3, Q4, Q5, ( , 16).The collectors of 1 to transistor Q1 are connected to the common emitters of 1 to transistors Q3 and Q4, and the collectors of 1 to transistor Q2 are connected to the common emitters of I to transistors Q5 and Q6. , the bases of the transistors Q3, Q6 are connected in common and connected to the voltage source E2 through the resistor R5, and the bases of the transistors Q4, 05 are connected in common and connected to the voltage source E2 through the resistor R6. It is connected to F2. Also, the transistor (;13, (:15 =
1 collectors are both connected to the voltage source Vcc, and the collectors of transistors 1 to Q4 and Q6 are both connected to the voltage source VCC through a resistor [<4].
, I connected the Q6 collector to the output terminal 32 of the video Buddhist bow. Roughly speaking, both ends of contrast adjustment Voricom V l'{ 1 are connected in parallel to the voltage source VCC, and the sliding end of V R 1 is connected to transistors Q4, Q! through resistor R7. i
is connected to the common base (contrast control end) of the

Therefore, by adjusting VR1, it is possible to control levels 1 to 3 h. Therefore, the common base of the transistors Q4 and Q5, which serve as the control terminal, is connected to the control terminal 33 via the resistor R8, and is connected to the reference potential point via the capacitor C1. ing. The resistor R 8 , :=t resistor C1 constitutes an integrating circuit. The control terminal 33 has a signal converter 'F1. 7 3
The control signal 11 (see FIG. 3 (1)) from A is supplied.

FIG. 3 shows the signal waveforms of each part of the circuit shown in FIG. 2 in correspondence with the display screen. The input terminal 31 has a
) Video signals as shown in (current television signal converted to high-definition television system)
and a third signal from the signal converter 73A to the control terminal 33.
A control signal g3 as shown in Figure (b) is added. The J control signal shown in (b) is a pulse signal with a width corresponding to the video period of the video signal shown in (a), but the video period Jζ - b time τ or phase of (a) is advanced. . The control pulse in FIG. 3(b) passes through the circuit of resistor R8 and sensor C1. The waveform is loud. The waveform of this (C) is =l
1 to last control 9μ; transistors Q4 and Q
! In order to join the common base of i, the video I symbol in (a) changes slowly between the period 1-1 at the beginning of the video and the period t2 at the end, as shown in Figure 3 (d). 1, Therefore, the current mark displayed on the screen 81 of a high-definition television receiver is the same as that of both ends 1, 82 of the television receiver 2.
The cut of 2 becomes soft 1~.

FIG. 4 is a sub-block diagram showing an embodiment of the present invention.

In FIG. 4, the same components as in FIG. 1 are given the same reference numerals and will be explained.

In FIG. 4, the signal converter 73B is the input terminal 7.
The current standard television signal supplied from 1 is converted into a signal based on the vertical length of the high-definition television screen, and the screen is shown at both ends (edges) of the converted standard television signal. 2 control signal 21 (Fig. 6(b)
(see). This signal conversion device 7 3 B is composed of a digital signal processing circuit, and the second control signal 21 can be easily generated based on various timing signals necessary for digital processing. Then, a switching circuit 74 switches between the converted current standard television signal output from the F3 converter 73B and a high-quality television signal input manually from the input terminal 72, and supplies the switched signal to the video signal processing circuit 7513. do. The video signal processing raccoon circuit 75B is a video J1 width circuit equipped with various adjustment circuits including the image quality adjustment circuit 22.
2. Control prostitute: For Ryo, the Buddhist name conversion device [I""? 7
The second control factor Q 2 1 from 3B is supplied. Video signal processing circuit 75B performs signal processing! The image quality adjustment circuit 22 shown in FIG. 5 is an example of the image quality adjustment circuit 22. This figure shows Jiii! The trade adjustment circuit includes a correction signal output circuit 62, a control circuit 63 for profit 15, and an adder 6.
4. It consists of a volume comb VR 2 for adjusting image quality. The input terminal 61 is connected to a high-definition television system kT-converted video signal (or a high-definition television system video I
station). This video signal is transmitted to the corrected code generation circuit 6.
If human power is applied to 2, the adder 64 is also input. The correction signal generation circuit 62 generates an image quality correction signal such as a quadratic differential waveform based on the input image signal and supplies it to the gain control circuit 63 at the next stage. The control terminal of the gain control circuit 63 is supplied with the Toga control voltage from the voltage control voltage VR2 via the resistor R11. Therefore, the image quality correction signal is sent to the gain control circuit 63 by d3.
2, the rate is controlled by 1F and output. Next, the adder 64 adds the human input video signal and the compensation-controlled correction signal to the adder 64, and outputs the output pane 65 to
It is output as a video signal adjusted by v:r. In this circuit, the amount of the correction signal added to the input video signal can be adjusted by the volume VR2, but in this embodiment, the amount of the correction signal added to the input video signal is adjusted by the terminal 66 connected to the control end of the gain control circuit 63 By applying the control signal (see FIG. 6(b)), the operation of the gain control circuit 63 is stopped for a predetermined period of the video signals at both ends of the screen (that is, the image quality correction operation is stopped for a predetermined period). )be able to.

FIG. 6 shows the signal waveforms of each part of the circuit shown in FIG. 5 in correspondence with the display screen. The human JdMf child 61 receives a video signal (high-definition TV 1) as shown in FIG.
The control terminal 66 is connected to the control terminal 66 from the signal converter 73B to the fifth
) Add a control signal as shown in Figure (b).

This control number 113 is shown in (a). This is, for example, a pulse signal of negative polarity corresponding to the timing of the predetermined period t3 at the beginning and the predetermined period 1-4 at the end of the number. , {Shite,
By applying this control signal to terminal 66, 1:3,
It is possible to stop the image τ'1 correction operation during the period i:4. Therefore, if the current standard television signal is displayed on the screen 81 of a Hatake quality receiver as shown in image 10182, even if the image quality is adjusted (even if the sharpness is emphasized), the image will be distorted. The predetermined period t3 at both ends of
i:4 is not corrected, both ends of the picture 1082/1.1
．． 42 edges are not emphasized and no glare occurs.

In the above embodiment, the 1st +g02 control symbol is generated based on the 1st clock of the digital signal processing section of the signal converter, but it is generated by the deflection circuit of the display section (not shown). It is also possible to generate and overturn using 7 pulses of "Hatsu Uzuro Mizu". Similarly, it is better to use the digital signal processing section 121 as in the embodiment because the control signal can be created more stably.

According to the present invention, when displaying video signals of the current standard television system with different aspect ratios on the screen of a high-definition television receiver, both ends of the image are This makes it possible to reduce ringing and glare at both ends of the image by making the amplitude change of the video signal gentler and preventing image quality adjustment from working at both ends of the image. Furthermore, the fluctuation in the amplitude at both ends of the image due to deterioration in high voltage regulation becomes less noticeable because the amplitude change in the video signal becomes gentler. Moreover, the present invention can be realized with a relatively simple configuration.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a high-definition television receiver according to an embodiment of the wooden invention, Fig. 2 is a circuit diagram showing an example of the contrast adjustment circuit in Fig. 1, and Fig. 3 is a circuit diagram of the contrast adjustment circuit shown in Fig. 2. An explanatory diagram explaining the circuit operation, FIG. 4 is a tab diagram showing another embodiment of the present invention, FIG. 5 is a sub-block diagram showing an example of the image quality adjustment circuit in FIG. 4, and FIG. is an explanatory diagram explaining the circuit operation of FIG. 5, FIG. 7 is a block diagram showing the configuration of a conventional high-definition television receiver, and FIG. 8 is an explanatory diagram explaining the circuit operation of FIG. 7. 111.21. Figure 9 is a front view showing the state in which the current standard television French name is projected on the high-definition display screen of the machine.・・・
Control signal, 12... Contrast 1 adjustment circuit, 22... Image quality adjustment circuit, 71... Current standard television signal input terminal, 72...
・・High quality television signal input terminal, 73A, 73B
...Number conversion device, 74...Switching circuit, 75A, 7513...Video signal processing circuit, 76...
CRT for high-definition displays.

Claims (2)

[Claims] (1) While scanning converting the current standard television system signal, which has a different aspect ratio from the high-definition television system signal, based on the vertical length of the screen of the high-definition display,
A signal conversion device that generates a control signal that controls the contrast between the beginning and end of a video signal within one horizontal period, a current standard television system signal output from this signal conversion device, and a high-definition television system. The apparatus includes a switching circuit for switching between the signals of the current standard television system, a contrast adjustment circuit, and an image quality adjustment circuit, and processes the output signal of the switching circuit and supplies it to the display means, and the apparatus is configured to process the output signal of the switching circuit and supply the signal to the display means, and is capable of receiving signals of the current standard television system. At times, a video signal processing circuit that gradually increases the gain of the contrast adjustment circuit during the first predetermined period of the video signal within one horizontal period and gradually decreases the gain of the contrast adjustment circuit during the final predetermined period of the video signal according to the control signal. and,
A high-definition television receiver characterized by being equipped with. (2) While scanning converting the current standard television system signal, which has a different aspect ratio from the high-definition television system signal, based on the vertical length of the screen of the high-definition display,
A signal conversion device that generates a control signal for stopping image quality correction at predetermined periods at the beginning and end of a video signal within one horizontal period, a current standard television system signal output from this signal conversion device, and a high-definition television system. The apparatus includes a switching circuit for switching between signals of the current standard television system, a contrast adjustment circuit, and an image quality adjustment circuit, and processes the output signal of the switching circuit and supplies the signal to the display means. a video signal processing circuit configured to stop the correction operation of the image quality adjustment circuit at a predetermined period at the beginning and end of the video signal within one horizontal period according to the control signal when the image is received. television receiver.