JP2588999B2 - High-definition television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-definition television display (hereinafter, abbreviated as a high-definition display) to which a high-definition television system is applied. The present invention relates to a high-definition television receiver for displaying a television signal.

[0002]

2. Description of the Related Art Conventionally, an NTSC television signal (hereinafter abbreviated as NTSC progressive scanning signal) converted into progressive scanning has a frame frequency of 59.94 Hz and a horizontal frequency of 31.47 KHz. On the other hand, a high-definition television signal has a field frequency of 60 Hz and a horizontal frequency of 33.
It is 75 KHz.

[0003] Therefore, since the vertical frequency and the horizontal frequency of the NTSC progressive scanning signal and the high-definition television signal are very close to each other, the NTSC progressive scanning signal is projected on a high-definition display for displaying the high-definition television signal. Can be issued. However, in the NTSC system, the aspect ratio of the display is 4: 3, whereas the aspect ratio of the high definition display is 16: 9.
In order to display on a high-definition display with no image distortion by a TSC progressive scanning signal, a method has been proposed in which an NTSC television signal is compressed at a predetermined compression ratio in a time axis direction which is a horizontal direction and displayed. ing.

FIG. 10 is a diagram showing a display state of a high-definition television receiver disclosed as a video display device in, for example, JP-A-1-194575.
01 is a high-definition display screen, 102 is a high-definition display screen 10 based on an NTSC television signal.
An image display portion 103 in FIG. 1 is a blank portion generated in the high-definition display screen 101 due to a difference in aspect ratio between the high-definition television system and the NTSC system.

That is, a high-quality display screen 101 having an aspect ratio of 16: 9 has an NTS having an aspect ratio of 4: 3.
Since the television signal of the C system is displayed as the image display portion 102, the high-definition display screen 101
Are formed on both sides of the image. When a high-quality display is used in such a state for a long time, the image display portion 1
02 phosphor degradation occurs. In addition, a high-definition display screen 101 for displaying a high-definition television signal is provided.
When the entire surface of the phosphor is used, unevenness in luminance of an image occurs due to deterioration of a part of the phosphor. Therefore, the margin 10
3 is displayed in gray level to prevent the occurrence of uneven brightness.

FIG. 11 shows television signal waveforms in which NTSC progressive scanning signals are time-compressed in the horizontal direction and signal blanking portions on both sides of the signals are interpolated with gray level signals.

FIG. 11A shows an NTSC progressive scanning signal, where S _V is a video signal section, and S _HB is a horizontal blanking section.

[0008] FIG. 11 (b) shows the case of time-compressed video signal portion S _V shown in the horizontal direction FIG. 11 (a), 1 denotes a video signal portion S _V of the horizontal scan of the NTSC system between dashed lines It becomes shorter than the original time duration of the pre-compression i.e. one horizontal scanning period T _H shown.

[0009] In FIG. 11 (c), the both sides of the video signal blank portion of the video signal portion S _V of the NTSC system which is formed by the compression, shows a signal waveform obtained by interpolating the gray level signal S _G of the same width . When the television signal shown in FIG. 11C is displayed on a high-definition display, FIG.
As shown in (a), both sides of the image display portion 102 become gray level display portions 103a having the same width.

In the meantime, in the NTSC progressive scanning signal, a video signal may be missing on both sides or a part of one side of a video signal portion due to a difference in a broadcasting station or a difference in program software.
The signal waveform in this case is shown in FIG. In FIG. 11 (d), the because of the video signal missing portion S _VB on both sides of the video signal portion S _V of the NTSC system, the time width of the video signal portion S _V is usually one horizontal scanning period of the NTSC system T _H It is shorter. This NTSC video signal section _SV is shown in FIG.
1 time-compressed in the horizontal direction (e), the gray level signal S _G of the same duration as in FIG. 11 (c) to the video signal blanking unit generated upon the compression in FIG. 11 (f) be interpolated as shown, the video signal missing portion S _VB compressed time between the video signal portion S _V and the gray-level signal S _G of the NTSC system remains as a video signal blanking unit.

When the television signal shown in FIG. 11 (f) is displayed on the high definition display, the display becomes as shown in FIG. 12 (b).
Image display portion 1 corresponding to the video signal portion S _V of the TSC method
02 is displayed. On both sides of the image display portion 102, a black level image blank portion 104 corresponding to the video signal blanking portion exists as a video signal missing portion _{SVB in a} band shape. Further, in the both outer sides of the image blank portion 104, the gray level display portion 103a corresponding to the gray level signal S _G is displayed.

Since the image becomes unsightly if there is a black band in the image blank portion 104, the width of the gray level display portion 103a is increased in advance as shown in FIG. You can keep it. However, in this case, if there is a video signal having a time width T _H of one normal horizontal scanning period, a part of the video signal is lost as a gray level signal.

[0013]

The conventional high-definition television receiver is constructed as described above, and the image blank portion 104 exists between the gray level display portion 103a and the image display portion 102. If the screen becomes unsightly, and if the width of the gray level display portion 103a is widened so as to remove the unsightlyness, there is a problem that both ends of the normal image are missing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and does not cause a blank portion of an image when displaying a current standard television signal on a high-definition display. An object of the present invention is to provide a high-definition television receiver capable of always forming an appropriate image without losing information at an end.

[0015]

Means for Solving the Problems A high-definition television receiving apparatus according to the present invention, the same A as the current line television system
Signals with spectral ratios differ from current television systems
Has the same aspect ratio as high-definition television
In high definition television receiver for converting and displaying the that signal, the video signal of the signal of the current television system
A compression means that compress at a predetermined ratio in the horizontal scanning direction section,
Due to the above-mentioned compression or lack of video signal and the above-mentioned compression
Of the current television signal after compression
Single video signal blank portion produced on at least one side of the scanning period
A signal adding means for outputting an interpolation signal to be interpolated by the color signal, and a water adding means of the compressed current television signal.
And discriminating means for detecting the black level of the positions corresponding to both end portions of the flat scanning period, by the judgment means, if the black level is detected a predetermined time continuously <br/>, run horizontally above interpolation signal
In the scanning direction , the black level is detected continuously for a certain period of time.
If that has not been output, control means for controlling said signal adding means so as to narrow the horizontal scanning direction <br/> width of the interpolation signal
Is provided .

[0016] In addition, high-definition television receiver, the same aspect ratio as the current line television system according to the present invention
Signal with high quality different from the current television system
Change to a signal with the same aspect ratio as the television system
In a high-definition television receiving device for displaying and replacing
A compression means that compress at a predetermined ratio an image signal portion in the horizontal scanning direction of the signal of the current television system, the compression,
Alternatively, due to the lack of a video signal and the above compression,
Current television system signal after the video signal blank portion produced on at least one side of the horizontal scanning period to a single color signal
And signal adding means for outputting an interpolation signal for interpolating Ri, the pressure
A first method for detecting a black level at a position corresponding to both end portions of a current television signal after compression in a horizontal scanning period.
And another unit, the second determining means first discriminating means detects the black level of the position corresponding to the inner <br/> side of a position to be detected, a certain time by the first discriminating means continuous with the black level is detected, the one by the second discriminating means
If the constant time continuous black level is not detected, the upper
Widen the serial interpolation signal, the if the predetermined time continuously black level is not detected by the first discriminating means, narrowing the width of the <br/> interpolated signal, given by the first discriminating means While the black level is detected continuously over time , the second
When the predetermined time continuously black level is detected by the determination means, so as not to change the width of the interpolation signal, the signal
It is obtained as a control means for controlling the addition means.

[0017]

In the present invention, the horizontal width of the video signal portion of a signal of the current standard television system is time-compressed in order to conform to a high-definition display, and the time width of the video signal blanking portion generated at the time of this compression is reduced. The video signal blanking section is interpolated by an interpolation signal having a time width corresponding to the amount of the black signal at the horizontal end of the video signal section or the amount of the black signal near the horizontal end, since the video signal blanking section differs depending on the initial signal state.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a first embodiment of the apparatus of the present invention. 1 is NTS as the current standard television system
An input terminal for inputting a C-type television signal, an input terminal 2 for inputting a high-definition television signal, and an input terminal 3 for converting an analog television signal arriving at the input terminal 1 into a digital television signal. / D conversion circuit,
An EDTV 4 converts a digital television signal output from the A / D conversion circuit 3 into an NTSC progressive scanning signal.
(High-quality digital television) A decoder that has functions such as separation of luminance signal and chrominance signal, sequential scanning conversion for performing signal conversion so as to enable sequential scanning, and matrix conversion.

Reference numeral 5 denotes N output from the EDTV decoder 4.
A time compression circuit for time-compressing the TSC progressive scanning signal, 6 a determination circuit for determining the presence or absence of a video missing portion at the horizontal end of the video signal of the output signal of the time compression circuit 5 and outputting it as a gray level width switching signal; A gray level adding circuit that adds a gray level signal having a width corresponding to the type of the gray level width switching signal to the output signal of the compression circuit 5, and 8 converts a digital output signal of the gray level adding circuit 7 into a signal of an analog amount. / A conversion circuit.

The portions indicated by the reference numerals 3 to 8 constitute a signal conversion section 30. The signal conversion section 30 converts a signal of the current standard television system having a different aspect ratio from a signal of the high definition television system into a progressive scan. At the same time, the video signal is compressed at a predetermined compression ratio (for example, a compression ratio based on the vertical length of a high-definition display) in the horizontal width of the video signal portion. interpolating a video signal blank portion caused by the gray level signal S _G as an example of the interpolation signal, and can be switched in accordance with the time width of the gray level signal S _G to the amount of black signal of a video signal end.

Reference numeral 9 denotes a switching circuit for selectively switching and outputting an output signal of the D / A conversion circuit 8 and a high-definition television signal input to the input terminal 2, and reference numeral 10 denotes an output signal of the switching circuit 9 as an input. , A high-quality display for displaying images.

FIG. 2 is a block diagram of the gray level adding circuit 7 shown in FIG. 1. Reference numeral 11 denotes an input terminal connected to an output terminal of the time compression circuit 5, and reference numeral 12 denotes an output terminal of the discriminating circuit 6. A control input terminal 13 is a gray level generating circuit that always generates a digital level gray level signal. Reference numeral 14 denotes a first gate signal generation circuit that outputs a gate signal having a width corresponding to the type of the gray level width switching signal, which is an output signal of the discrimination circuit 6, corresponding to the video signal blanking unit. Reference numeral 15 denotes a switch circuit in which the rotor side is connected to the output terminal 16, the control terminal is connected to the output terminal of the first gate signal generation circuit 14, and the stator side is connected to the input terminal 11 and the output terminal of the gray level generation circuit 13. Yes, first
While the gate signal is being input from the gate signal generation circuit 14, the output terminal 16 is connected to the output terminal side of the gray level generation circuit 13; otherwise, the output terminal 16 is connected to the input terminal 11 side.

FIG. 3 shows the structure of the discriminating circuit 6, 17 is an input terminal connected to the output terminal of the time compression circuit 5, and 18 is a second gate signal generating circuit for generating a gate signal corresponding to a video signal end. It is. Reference numeral 19 designates a signal input to the input terminal 17 as a signal input, and a second gate signal generation circuit 18.
Is a first black signal detection circuit having the output signal as a control input. While the gate signal is being input from the second gate signal generation circuit 18, the black signal among the signals input to the input terminal 17 is To detect. Reference numeral 20 denotes a first integration circuit for integrating the output signal of the first black signal detection circuit 19 over n (n ≧ 1) frames, and 21 compares the output signal of the integration circuit 20 with the determination level, and sets the comparison result to gray. A first level determination circuit 22 that outputs a level width switching signal is an output terminal connected to the control terminal of the gray level adding circuit 7.

FIG. 4 is a signal waveform diagram of the television signal, and FIG. 5 is a signal waveform diagram of the output signal of the first integration circuit 20.

Next, the operation of the above apparatus will be described with reference to FIGS. The NTSC television signal input to the input terminal 1 is converted by the A / D conversion circuit 3 into a digital television signal.
The V decoder 4 performs luminance signal / chrominance signal separation, sequential scan conversion, matrix conversion, and the like.
The signal is converted into an NTSC sequential scanning signal having 94 Hz and 525 horizontal scanning lines. The NTSC progressive scan signal is time-compressed by the time compression circuit 5 at a predetermined compression ratio so that the horizontal width of the video signal portion is converted into the current aspect ratio based on the vertical length of the screen of the high-quality display 10. It is output to the discriminating circuit 6 and the gray level adding circuit 7.

[0026] For example, FIG. 4 (a) shows the NTSC progressive scanning signal immediately before being input to the time compression circuit 5, the video signal portion S _V is shorter than one horizontal scanning period T _H, the horizontal blanking section S _HB This shows a state where a video signal missing portion S _VB exists between the video signal portion S _V and the video signal portion S _V.

FIG. 4B shows the video signal portion S _V shown in FIG.
The shows a signal state after the time-compressed by a time compression circuit 5 together with the video signal missing portion S _VB, a video signal blanking unit S _O containing compressed video signal missing portion S _VB video in time T _H It occurs on both sides of the signal portions S _V. The discriminating circuit 6 monitors a black signal corresponding to both ends S _{VB of the} video signal.
If a black signal appears continuously for a certain period of time, it is determined that the black signals at both ends are image missing portions, otherwise, it is determined that the black signal is a video signal portion, and the gray level adding circuit 7 is used as a gray level width switching signal. Output to the control terminal.

The gray-level addition circuit 7 is adjacent both sides of the video signal blanking unit S _O of the video signal portion S _V to the video signal portion S _V by the gray level signal of a time width corresponding to the gray level width switching signal Interpolation. More specifically, the output signal of the time compression circuit 5 as shown in FIG. 4B is input to the input terminal 11 of the gray level adding circuit 7, and the gray level is input to the other input terminal of the switch circuit 15. A predetermined gray level signal from the generation circuit 13 is input. On the other hand, the first gate signal generation circuit 14 to which the gray level width switching signal output from the discriminating circuit 6 is input is supplied to the first gate signal generation circuit 14 according to the type of the gray level width switching signal.
One of the two types of gate signals shown in FIGS. 4C and 4D is input to the control terminal of the switch circuit 15. Switch circuit 15
Switches the output terminal 16 to the gray level generation circuit 13 while the gate signal is being input to the control terminal, and switches the output terminal 16 to the input terminal 11 otherwise.

On the other hand, the output signal of the time compression circuit 5 is also input to the input terminal 17 of the discrimination circuit 6, and this signal is input to the first black signal detection circuit 19. The control signal of the black signal detection circuit 19 is supplied with the gate signal of FIG. 4 (e), which is the output of the second gate signal generation circuit 18, and detects the black signal during the period when the gate signal is being input. . First
Integrates the output signal of the black signal detection circuit 19 over n frames (n ≧ 1). The first level determination circuit 21 compares the output signal f (t) of the integration circuit 20 with predetermined levels W ₁ and W ₂ as shown in FIG. As a result,

When f (t) ≦ W ₁ (period in FIG. 5), that is, when the number of black signals is small during the gate signal input period in FIG. 4 (e), this signal is determined to be a video signal (information). And the first
The gate signal generation circuit 14 outputs a gray level width switching signal so as to select the gate signal shown in FIG.

When W ₁ <f (t) <W ₂ (period in FIG. 5), that is, there are relatively many black signals during the gate signal input period, it is determined whether this signal is a noise or a video signal. If it is difficult, the first gate signal generation circuit 14 outputs a gray level width switching signal so that the previous state is maintained.

[0032] When f (t) ≧ W ₂ (Fig. 5 periods), that is, when the black signal is large in the gate signal period, the signal is discriminated as the image missing portion, the gate signal generating circuit 14 in FIG. A gray level width switching signal is output so as to select the gate signal of 4 (d).

For example, when the signal shown in FIG. 4B continues for one frame (l ≧ n), the signal within the gate signal period of FIG. 4E is determined to be a missing portion, and FIG. The video signal blanking section S _O is converted to the gray level signal S by using the gate signal of d).
Interpolate with _G. Thus, initially even if the video signal missing portion S _VB, will be completely interpolated gray level signal S _G. Also, if there is no video signal missing portion _SVB with the same signal as the NTSC progressive scanning signal shown in FIG.
Since there is no black signal in the gate signal period of (e), it is determined that the signal in this period is a video signal, and the video signal blanking section S _{O is set} to the gray level by using the gate signal of FIG. 4 (c). interpolating signal S _G.

The signal shown in FIG. 4 (f) or the same signal as shown in FIG. 11 (c) is output from the gray level adding circuit 7 and is converted by the D / A conversion circuit 8 into a signal of an analog amount. 9 through a high-quality display 10. A screen similar to that shown in FIG. 12C shows a state in which the signal shown in FIG. 4F is imaged on the high-quality display screen 101, and the gray level display portion 103a is similar to that shown in FIG. The screen is wider than the normal case of a simple screen, and the image blank portion 104 is interpolated.

If the switching circuit 9 is switched to the input terminal 2 side while a high-definition television signal is being input to the input terminal 2, the high-definition display 10 will fill the screen with the high-definition television signal. Create an image.

FIG. 6 shows the configuration of a second embodiment of the apparatus of the present invention. Numeral 40 denotes a signal conversion unit composed of parts indicated by reference numerals 3 to 5, 7, and 8 and a discrimination circuit 36, and is a high-definition television. The signal of the current standard television system having an aspect ratio different from that of the television system is converted to progressive scanning, and a predetermined compression ratio (for example, compression based on the vertical length of a high-definition display) is applied to the horizontal width of the video signal portion. compressed by a factor), and the interpolation video signal blank portion produced on at least one side of the video signal section at the gray level signal S _G as an example of the interpolation signal by the difference in the aspect ratio during the compression,
This allows switching in accordance with the time width of the gray level signal S _G to the amount of black signal near amount and the horizontal edge of the black signal of the horizontal edge of the video signal portion. Other configurations are the same as those of the first embodiment.

FIG. 7 shows the configuration of the discrimination circuit 36, 27 is a third gate signal generation circuit for generating a gate signal corresponding to the vicinity of the video signal end, and 23 is a signal input to the input terminal 17 as a signal input. , A second black signal detection circuit that uses the output signal of the third gate signal generation circuit 27 as a control input, and inputs the signal to the input terminal 17 while the gate signal is being input from the third gate signal generation circuit 27. A black signal is detected from the signals obtained. Reference numeral 24 denotes a second integration circuit for integrating the output signal of the second black signal detection circuit 23 over m (m ≧ 1) frames, and reference numeral 25 compares the output signal of the second integration circuit 24 with a predetermined level. The second level determination circuit 26 that outputs the result outputs the output signal of the first level determination circuit 21 as it is or retains the previous state according to the output signal of the second level determination circuit 25. And the other configuration is the same as that of the first embodiment.

FIG. 8 is a signal waveform diagram of a television signal according to the second embodiment, and FIG. 9 is an integration circuit 2 according to the second embodiment.
It is an output signal waveform diagram of 0,24.

Next, the operation of the second embodiment will be described with reference to FIGS. The NTSC progressive scan signal time-compressed by the time compression circuit 5 is output to the discrimination circuit 36 and the gray level addition circuit 7.

FIG. 8A shows an NTSC progressive scan signal similar to that shown in FIG. 4A, and FIG. 8B shows a time-compressed NTSC progressive scan signal similar to that shown in FIG. by the video signal blanking unit S _O including a video signal missing portion S _VB has occurs on both sides of the video signal portion S _V of the period T _H. Discrimination circuit 36 monitors the black signal portions corresponding to both ends S _VC in the black signal and a video signal portion S _V of the portions corresponding to both ends S _VB of the video signal portion S _V, a period of time continuously S It appears black signal in _VB, and determines that when not appear black signal in S _VC is black signal missing part in the S _VB, appears black signal in the S _VB,
If a black signal also appears in S _VC , it is determined that the black signal in S _VB is a missing part or represents black video information, and the previous determination state is maintained. In this case, the signal in _SVB is determined to be a video signal portion, and is output to the gray level adding circuit 7 as a gray level width switching signal.

The gray-level addition circuit 7 is adjacent both sides of the video signal blanking unit S _O of the video signal portion S _V to the video signal portion S _V by the gray level signal of a time width corresponding to the gray level width switching signal Interpolation. More specifically, the input terminal 11 of the gray level adding circuit 7 is
The output signal of the time compression circuit 5 shown in (b) is input, and a predetermined gray level signal from the gray level generation circuit 13 is input to the other input terminal of the switch circuit 15. The first gate signal generation circuit 14 to which the gray level width switching signal output from the determination circuit 36 is input
Input one of the two types of gate signals shown in FIGS. 8C and 8D to the control terminal of the switch circuit 15 in accordance with the type of the gray level width switching signal, and the switch circuit 15 While the gate signal is being input, the output terminal 16 is switched to the gray level generating circuit 13 side, and otherwise the input terminal 11 is switched to the input terminal 11 side.

On the other hand, the output signal of the time compression circuit 5 is also input to the input terminal 17 of the discrimination circuit 36, and this signal is input to the first black signal detection circuit 19. The control signal of the black signal detection circuit 19 receives the gate signal shown in FIG. 8 (e), which is the output of the second gate signal generation circuit 18, and the black signal detection circuit 19 receives this gate signal. The black signal during the period is detected. The first integration circuit 20 integrates the output signal of the black signal detection circuit 19 over n (n ≧ 1) frames. As shown in FIG. 9A, the first level determination circuit 21 outputs the output signal f (t) of the integration circuit 20 and the predetermined level W
₁ and W _2, and as a result,

When f (t) ≦ W ₁ (the period of FIG. 9A), that is, when the number of black signals is small during the gate signal input period of FIG. 8E, this signal is a video signal (information ), And outputs a gray level width switching signal to the hold circuit 26 so that the first gate signal generation circuit 14 selects the gate signal shown in FIG.

W ₁ <f (t) <W ₂ (period in FIG. 9A)
In other words, when there are relatively many black signals during the gate signal input period, but it is difficult to determine whether this signal is noise or a video signal, the first gate signal generation circuit 14 holds the previous state. To output a gray level width switching signal to the hold circuit 26.

[0045] When the f (t) ≧ W ₂ (the period of FIG. 9 (a)), that is, when the black signal is large in the gate signal period, and determines that the signal is a video missing portion, the gate signal The generation circuit 14 outputs a gray level width switching signal to the hold circuit 26 so as to select the gate signal shown in FIG.

The output signal of the time compression circuit 5 is also input to the second black signal detection circuit 23, and the control terminal of the black signal detection circuit 23 is the output of the third gate signal generation circuit 27. The gate signal shown in FIG.
The black signal detection circuit 23 detects a black signal during a period when the gate signal is input. The second integration circuit 24
The output signal of the black signal detection circuit 23 is m frames (m ≧
Integrate over 1). The second level determination circuit 25 outputs the output signal g (t) of the second integration circuit 24 and a predetermined level W
Compare ₃ and

When g (t) ≦ W ₃ (the period of FIG. 9B), that is, when the number of black signals in the gate signal of FIG.
The hold circuit 26 outputs a control signal so that the output signal of the first level determination circuit 21 is output to the output terminal 22 as it is. Therefore, in this case, the same result as in the first embodiment is obtained.

[0048] When g (t) ≧ W ₃ black signal in the gate signal in the case i.e. diagram (FIG. 9 (b period)) 8 (f) is large,
The control signal is output so that the hold circuit 26 holds and outputs the output of the first level determination circuit 21.

For example, when the signal shown in FIG. 8B continues for one frame (l> m, l> n), there are many black signals in the gate signal of FIG. 8E, and the signal shown in FIG. Since there is no black signal in the gate signal, the signal in the gate signal of FIG. 8 (e) is determined to be a missing portion, and the video signal blanking section S _O is grayed using the gate signal of FIG. 8 (d). interpolating level signal S _G. Therefore, it would be completely interpolated original gray level signal S _G even when the video signal missing portion S _VB. Also, if the signal is similar to the NTSC progressive scan signal shown in FIG. 11A and there is no video signal missing portion, there is no black signal in the gate signal period of FIG. Since there is no black signal in the gate signal period of f), the signal in the gate signal of FIG. 8E is determined to be a video signal, and the video signal is blanked using the gate signal of FIG. 8C. interpolating part in gray level signal S _G.

A signal similar to that shown in FIG. 8 (g) or FIG. 11 (c) is output from the gray level adding circuit 7 and is converted into an analog signal by the D / A conversion circuit 8, and is transmitted through the switching circuit 9. And is imaged by the high-quality display 10. A screen similar to that shown in FIG. 12 (c) shows a state in which the signal shown in FIG. 8 (g) is imaged on the high-quality display screen 101, and a gray level display portion 103a is similar to that shown in FIG. 12 (a). It is wider than a normal screen, and complements the image blank portion 104.

In each of the above embodiments, when a television signal of the current standard television system is displayed on a high-definition display, an image is displayed at the center of the high-definition display screen. The same effect as in the above-described embodiments can be obtained even if the display is performed and only one side is displayed in the gray level. Further, although the width of the gray level display portion is switched between two types, the width may be switched to more types. Although the width of the gray level display portion is the same at the left and right ends, the width may be different at the left and right.

In each of the above embodiments, the interpolation signal for interpolating the video signal blanking portion is set to the gray level, but a color or the like may be added. Further, the compression ratio of the time compression circuit 5 is based on the vertical length of the high-quality display screen. However, if the image is not completely displayed on the screen, for example, the vertical length is the vertical length of the high-quality display screen. Any compression ratio based on the above dimensions that are smaller than the width of the high-quality display screen may be used.

[0053]

As it is evident from the foregoing description, according to the high definition television receiving apparatus according to the present invention, and the present line television system
Signals with the same aspect ratio are converted to the current television system
Same aspect ratio as high-definition television system
High-definition television receiver for converting to a signal having
In the imaging device, the signal of the current television system is displayed.
A compression means for compressing the image signal portion at a predetermined rate in the horizontal scanning direction
Stage and the above compression or lack of video signal and the above compression
As a result, of the signal of the current television system after the compression,
With the signal for outputting the interpolation signal for interpolating at least video signal blank portion <br/> occurring on one side of the horizontal scanning period by monochromatic signal
And a signal of the current television system after the compression.
Black level at positions corresponding to both ends of the horizontal scanning period
A predetermined time by the determining means for detecting
If the black level is detected continuously,
If the black level is not detected continuously for a certain period of time in the horizontal scanning direction,
Control means for controlling the signal adding means so as to reduce the width in the direction.
Having to so that a control means, without causing the image blank portion of the black band adjacent to the image display portion and that no information of the edge of the image are missing, always possible to obtain an appropriate image There is an effect that can be. Also, the high-quality product according to the present invention
According to the current television receiver,
A signal with the same aspect ratio as the current television
The same aspect as high-definition television
High-definition television
In the television receiver, the signal of the above-mentioned current television system is used.
For compressing the video signal part of the
Compression means or the above-mentioned compression or lack of video signal and
By compression, the signal of the current television system after the compression
Of the video signal generated on at least one side of the horizontal scanning period
A signal that outputs an interpolation signal that interpolates the white part with a single color signal
Signal adding means and the signal of the current television system after the compression.
Black level at the positions corresponding to both ends of the horizontal scanning period
First determining means for detecting the
Detect the black level at a position inside the detection position.
Out of the second discriminating means and the first discriminating means.
While the black level is detected continuously for a fixed time,
Predetermined time continuously black level detection of the second discriminating means
If not, the width of the interpolation signal is increased and the first
The black level is detected continuously for a certain period of time
If not, the width of the interpolation signal is reduced and the first
The black level is continuously detected for a predetermined time by the discriminating means.
At the same time, the second determination means continuously
If a black level is detected, change the width of the interpolation signal.
Control means for controlling the signal adding means so as not to
So that the black band next to the image display
No image blanks, and information on the edges of the image
Can always get the right image without missing
There is a clear effect.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the device of the present invention.

FIG. 2 is a configuration diagram of a gray level adding circuit according to the present invention.

FIG. 3 is a configuration diagram of a discrimination circuit according to the first embodiment of the present invention.

FIG. 4 is a signal waveform diagram according to a first embodiment of the present invention device.

FIG. 5 is an output waveform diagram of the integration circuit according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram of a device according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a discrimination circuit according to a second embodiment of the present invention.

FIG. 8 is a signal waveform diagram according to a second embodiment of the device of the present invention.

FIG. 9 is a signal waveform diagram of an integration circuit according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a display state of a conventional device.

FIG. 11 is a signal waveform diagram of the conventional device.

FIG. 12 is a diagram illustrating a defect in a display state of a conventional device.

[Explanation of symbols]

 Reference Signs List 4 EDTV decoder 5 Time compression circuit 6, 36 Discrimination circuit 7 Gray level addition circuit 10 High quality display 30, 40 Signal conversion unit

Claims (2)

(57) [Claims] [Claim 1] the same aspect as the current line television system
High quality signal with different ratio than current television system
To the position signal having the same aspect ratio as the television system
In high definition television receiver for converting and displaying missing and the current TV and compression means a video signal portion of the television system of the signal that be compressed at a predetermined ratio in the horizontal scanning direction, the compression, or video signals Due to the above compression
Of the current television signal after compression
Single video signal blank portion produced on at least one side of the scanning period
Signal addition means for outputting an interpolation signal to be interpolated by a color signal, and horizontal scanning of the compressed current television signal
And discriminating means for detecting the black level of the positions corresponding to both end portions of the period, by the judgment means, a predetermined time continuously black level detection
If it is, widen the horizontal scanning direction of the interpolation signal, if the reverse for a predetermined time continuously black level is not detected, the to narrow the width of the horizontal scanning direction of the interpolation signal A high-definition television receiver comprising: a control unit for controlling the signal adding unit . 2. The method of claim 1] the same aspect as the current line television system
High quality signal with different ratio than current television system
To the position signal having the same aspect ratio as the television system
In high definition television receiver for converting and displaying missing and the current TV and compression means a video signal portion of the television system of the signal that be compressed at a predetermined ratio in the horizontal scanning direction, the compression, or video signals Due to the above compression
Of the current television signal after compression
Single video signal blank portion produced on at least one side of the scanning period
Signal addition means for outputting an interpolation signal to be interpolated by a color signal, and horizontal scanning of the compressed current television signal
The black level at the position corresponding to both ends of the period is detected.
A first discriminating means, said second determination means for first determining means detects the black level of the position corresponding to the inside than the position detecting, a predetermined time continuously black by the first discriminating means Level
Is detected and at a certain time by the second determination means.
If during continuous black level is not detected, expanding the width of the auxiliary <br/> between signals, a predetermined time continuously black level by the first discriminating means
If not detected, narrowing the width of the interpolation signal, a predetermined time continuously black level by the first discriminating means
Is detected and at a certain time by the second determination means.
If during continuous black level is detected, so as not to change the width of the interpolation signal, for controlling said signal adding means braking
And a control means .