JPH05292424A - Television receiver - Google Patents

Abstract

PURPOSE:To receive every television signals as high-definition images by displaying the images while making the aspect ratio of television signals different for an NTSC system and an EDTV or HDTV system. CONSTITUTION:A selecting circuit 7 selects and outputs a signal sequence VH in the HDTV system or selects and outputs a signal sequence VIN in living NTSC and EDTV systems corresponding to a selection control signal (b). This output signal is converted to an analog three primary color signal sequence VS by a D/A conversion part 8, and a wide aspect ratio display part 9 displays television images in a certain form for which the aspect ratio is 16:9, the number of scanning lines is 1125 and 2:1 interlace scanning is performed. In this case, the television images are displayed at the aspect ratio of 16:9 in the EDTV and HDTV systems and displayed at the aspect ratio of 4:3 in the living NTSC system. Then, the television images of all the systems are displayed in the form for which the number of scanning lines is 1125 and 2:1 interlace scanning is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to the current NTSC system, EDTV system, HDTV.
The present invention relates to a television receiver suitable for receiving a high-quality television image for a television signal of any one of the methods.

[0002]

2. Description of the Related Art 4: 3 is used as the aspect ratio of television images in the current NTSC system of television.
In order to provide a more realistic image service, EDT
In the V system and the HDTV system, a television image is formed with an aspect ratio of 16: 9 to widen the screen. Also,
The current NTSC system and the EDTV system, which is compatible with the current NTSC system, employs 525 scanning lines, while the HDTV system uses as many as 1125 scanning lines to achieve high definition.

Therefore, the development of a television receiver capable of receiving a television signal of any of the EDTV system and the HDTV system whose aspect ratio and number of scanning lines are different from the current NTSC system has been developed. It is being advanced.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a television receiver which can receive a television signal of any of the current NTSC system, EDTV system and HDTV system as a high definition image.

[0005]

In order to achieve the above object, in the present invention, the display section is configured with an aspect ratio of 16: 9, and in the EDTV system and the HDTV system, one TV image is displayed.
It is displayed as a TV image with an aspect ratio of 6: 9, and with the current NTSC system an aspect ratio of 4: 3.

Then, a television image of any system is displayed in the form of interlaced scanning with 1125 scanning lines and 2: 1 to achieve high definition.

Further, television images of either system are displayed in the form of progressive scanning with 1125 scanning lines and 1: 1.
Higher quality is achieved by reducing image interference caused by interlaced scanning.

[0008]

In the present invention, the television image is displayed in the display form shown in FIG. Current NTSC system (aspect ratio 4: 3, 525 scanning lines, 2: 1 interlaced scanning,
For a television signal of 480 effective pixel scanning lines), scanning conversion from interlace to progressive scanning is performed,
The number of effective pixel scanning lines is 480, and the signal sequence is converted into a 1: 1 sequential scanning signal sequence. Then, by the scanning line number conversion processing, a signal series of 2: 1 interlaced scanning with 1040 effective pixel scanning lines is generated. Furthermore, the time axis 3/4 compression processing of the effective pixel area of each scanning line is performed, and an image with an aspect ratio of 4: 3 is displayed in the shaded area in FIG.

On the other hand, for an EDTV system letterbox type (525 scanning lines, 2: 1 interlaced scanning, 360 effective pixel scanning lines form an image with an aspect ratio of 16: 9) television signals. , Interlaced to progressive scan conversion processing, 360 effective pixel scanning lines,
Converted to a 1: 1 progressive scanning signal sequence. Next, by the scanning line number conversion processing, the number of effective pixel scanning lines is 480, 1: 1
Convert to a signal sequence for progressive scanning. In addition, the current NTSC
A scanning line number conversion process similar to that of the method is performed to generate a signal series of 1040 effective pixel scanning lines and 2: 1 interlaced scanning. Then, in the shaded area in the figure, the aspect ratio 1
The image of 6: 9 is displayed.

The HDTV system (aspect ratio 16:
(9, 1125 scanning lines, 2: 1 interlaced scanning), this 2: 1 interlaced scanning signal sequence has an aspect ratio of 1 in the shaded area in FIG.
It is displayed as a 6: 9 image.

As described above, according to the present invention, the current NTSC system,
Since an EDTV system television signal can be subjected to interlace-sequential scan conversion and scan line number conversion processing with little deterioration in image quality, a high-definition image can be displayed even for these television signals. Will be possible.

For any type of television signal, interlace-sequential scan conversion processing is further performed to generate a 1: 1 progressive scan signal sequence having 1125 scanning lines. You can also display the image with.
In this case, it is possible to reduce the image quality disturbance due to the interlaced scanning, so that the image quality of the television image is further improved.
It is possible to improve the quality.

[0013]

FIG. 2 shows the overall block configuration of the first embodiment of the present invention. This is suitable for displaying a television image on the display unit in the form of interlaced scanning having an aspect ratio of 16: 9, scanning lines of 1125, and 2: 1.

The television signal in the base band is
HDTV decoding circuit 1, NTSC decoding circuit 2, E
It is input to the DTV decoding circuit 3 and the system discriminating circuit 4.

In the HDTV decoding circuit 1, for example, H
A predetermined demodulation process is performed on a television signal of HDTV system such as DTV-MUSE system, and the number of scanning lines is 11
25, 2: 1 interlaced scanning digitized primary color signal series VH is generated.

In the NTSC decoding circuit 2, the current NTS
TC separation based on the C method, demodulation processing such as color demodulation, scan conversion from interlaced scanning to progressive scanning, horizontal time axis compression processing are performed, and the number of effective pixel scanning lines is 480.
Book, effective pixel area of each scan line is 3/4 in 1: 1 sequential scan
A time-axis-compressed digital three-primary-color signal series VN is generated.

The EDTV decoding circuit 3 performs a predetermined demodulation process according to the letterbox type EDTV system, that is, YC separation, color demodulation, scan conversion from interlaced scan to progressive scan, and scan line number conversion. ,
A digitized three-primary-color signal series VE in the form of progressive scanning with 480 effective pixel scanning lines and 1: 1 is generated.

The system discriminating circuit 4 discriminates the system based on the form of the synchronizing signal of the television signal, the identification code, etc., and generates a selection control signal corresponding thereto.

The selection circuit 5 outputs a signal sequence VN in the current NTSC system and a signal sequence VE in the EDTV system as a signal sequence VP according to a selection control signal.

The interlaced scan conversion circuit 6 performs a scanning line number conversion process to generate a signal series VIN in the form of 1: 1 scanning lines (1040 effective pixel scanning lines) and 2: 1 interlaced scanning. ..

The selection circuit 7 receives the HDT according to the selection control signal.
V system uses signal sequence VH, current NTSC system and EDTV
In the method, the signal series VIN is selected and output. This output signal is sent to the D / A converter 8 for analog three primary color signal series VS.
And the wide aspect ratio display unit 9 displays a television image in the form of interlaced scanning with an aspect ratio of 16: 9, scanning lines of 1125, and 2: 1.

Next, the configuration of each block in this embodiment will be described in detail together with the embodiment.

FIG. 3 shows an embodiment of the HDTV decoding circuit 1, which is suitable for an HDTV-MUSE type television signal.

The television signal is converted into a digital signal by the A / D converter 10. The YC separation unit 11 separates the luminance signal component Y and the chrominance signal component C, which are superimposed in the form of time division multiplexing.

The luminance signal demodulating section 13 performs a time axis expansion operation and a frequency-multiplexed luminance signal high-frequency component demodulation operation to generate a luminance signal YH. The high frequency component demodulation operation is performed by motion adaptive signal processing. The motion information necessary for this is detected by the motion information detection unit 12 by a difference signal between two frames, a low frequency component of the difference signal between one frame, and the like.

The color signal demodulation section 14 carries out a time axis expansion operation and a color demodulation operation to obtain the color difference signals CN and CW.
To generate.

The RGB converter 15 converts the luminance signal YH and the color difference signals CN and CW into the three primary color R, G and B signals by a predetermined matrix calculation operation, and the number of scanning lines is 1125, 2: 1.
Generate a digitized three primary color signal sequence VH in the form of interlaced scanning.

The control signal generator 16 generates signals necessary for these operations.

Next, another embodiment of the HDTV decoding circuit 1 is shown in FIG. This is an HDT different from the MUSE method
It is suitable for V type television signals.

The television signal is digitized by the A / D converter 17, and the HDTV demodulation circuit 18 performs a predetermined demodulation operation according to the system to demodulate the luminance signal YH and the color difference signals CN, CW. Then, the RGB conversion unit 19 sets 3
Converted to primary color R, G, B signals, the number of scanning lines is 1125,
A 2: 1 interlaced scan digitized three primary color signal sequence VH is generated. Signals necessary for these operations are generated by the control signal generator 19.

Next, an embodiment of the NTSC decoding circuit 2 is shown in FIG.

The television signal is sent to the A / D converter 20,
For example, a sampling operation is performed at a frequency four times as high as the color subcarrier fsc to convert it into a digital signal.

The YC separation unit 21 is a motion adaptive type three-dimensional Y.
By the C separation operation, the luminance component Y and the color component C are separated and extracted. The motion information necessary for this operation is detected by the motion information detection unit 22 based on the difference signal between two frames and the low frequency component of the difference signal between one frame.

The color signal demodulation section 23 synchronously detects the color component C with the color subcarrier fsc to demodulate the color difference signals I and Q.

In the progressive scan conversion unit 24, a signal of a scan line which has been missed by the 2: 1 interlace scan is generated by a motion adaptive scan line interpolation operation, and is 1: 2 by a time axis 1/2 compression and rearrangement operation. The scan conversion to the signal form of the progressive scan of 1 is performed. The pattern of this operation is shown in FIG. The signal IP of the interpolated scanning line which is not transmitted by the interlaced scanning shown by the hatched portion in the figure is the average value of the signals of the scanning lines A and B of the preceding and following fields suitable for a still image, the upper and lower sides of the same field suitable for a moving image. The average value of the signals of the scanning lines C and D is generated by changing the mixing ratio according to the motion information.

The RGB conversion section 25 converts the luminance and color difference I, Q signal series into three primary color R, G, B signal series by a predetermined matrix operation.

In the horizontal time axis compression unit 26, as shown in FIG. 1, since the image having the aspect ratio of 4: 3 is displayed on the display unit having the aspect ratio of 16: 9, 3 of the effective pixel area of each scanning line is displayed. / 4 hour compression operation is performed.

FIG. 7 shows the pattern of this operation. The same figure (a)
Is an operation explanatory view. 3 for the effective pixel area
/ 4 compressed and placed in the center of one horizontal scanning line period. Then, the masking regions at both ends of the screen where no image is displayed are replaced with a specific signal (for example, a signal corresponding to black or gray). Further, FIG. 9B shows an example of characteristics when the time axis compression is performed by the 4 to 3 conversion operation of the sample points. This is the four pixels a, b,
Signals of three pixels of a 3 / 4-compressed signal sequence on the time axis indicated by dots are generated by weighting and adding coefficients c and d, and 4 to 3 conversion of sampling points is realized. Then, a digitized three primary color signal series VN in the form of progressive scanning with 480 effective pixel scanning lines and 1: 1 is generated.

The control signal generator 27 generates signals necessary for these operations.

In this embodiment, the YC separation and the scan conversion to the progressive scan are shown by the motion adaptive type processing.
These can also be realized in the form of fixed parameters. Further, a nonstandard signal whose phase relationship between the sync signal and the color subcarrier does not satisfy the standard can be dealt with by processing in the complete moving image mode.

Next, FIG. 8 shows an embodiment of the EDTV decoding circuit 3. This embodiment is suitable for a television signal in which an auxiliary signal for interlace-sequential scan conversion is superimposed on the mask portions at the top and bottom of the screen shown in FIG.

The television signal is sampled by the A / D converter at a frequency four times as high as the color subcarrier and converted into a digital signal, which is input to the auxiliary signal separator 29, YC separator 31, and motion information detector 32. To be done.

The auxiliary signal separating section 29 separates and extracts the auxiliary signal components superimposed on the upper and lower mask area. Then, the auxiliary signal demodulation unit 30 performs predetermined processing such as time-axis conversion, rearrangement, expansion operation, and demodulation operation, and reproduces the auxiliary signal SH used for scan conversion.

The YC separation unit 31 performs a motion adaptive three-dimensional YC separation operation to separate and extract the luminance component Y and the color component C. The motion information necessary for this is the motion information detection unit 3
In step 2, the detection is performed based on the difference signal between two frames and the low frequency component of the difference signal between one frame.

In the color signal demodulation section 33, the color component C is synchronously detected by the color subcarrier fsc to demodulate the color difference signals I and Q.

The progressive scan conversion unit 34 performs interlace-sequential scan conversion using the auxiliary signal SH to generate a 1: 1 progressive scan signal sequence having 360 effective pixel scanning lines.

The pattern of this operation is shown in FIG. Regarding the low frequency component of the luminance signal, an auxiliary signal is added to the signal of the scanning line transmitted by the interlaced scanning to generate the signal of the interpolation scanning line. That is, by the signals SA and SB of the scanning lines A and B and the auxiliary signals SHA and SHB corresponding thereto,
The signals of the interpolated scan lines are SA + SHA and SB + SH, respectively.
Generate in B. On the other hand, for the high frequency component and the color difference signal component of the luminance signal, the interpolation scanning line signal is generated by the average value of the signals of the upper and lower scanning lines in the same field. That is, the signal of the interpolation scanning line is generated by the average value 1/2 (SA + SB) of the signals SA and SB of the scanning lines A and B.

The scanning line number conversion unit 35 converts the 1: 1 sequential scanning signal having 360 effective pixel scanning lines into a 1: 1 sequential scanning signal having 480 effective pixel scanning lines. Do. FIG. 10 shows an operation explanatory diagram when this is realized by converting the number of scanning lines into 3 to 4. The signals of the scanning lines a, b, and c of the system of 360 scanning lines are weighted and added to generate the signals of the scanning lines of the system of 480 scanning lines indicated by dots.

The RGB conversion section 36 performs a predetermined matrix calculation operation, and digitizes three primary color signal series V in the form of progressive scanning with 480 effective pixel scanning lines and 1: 1.
Generate E.

The signals necessary for these operations are generated by the control signal generator 37.

In the present embodiment, the case where the auxiliary signal SH is for interlace-sequential scan conversion has been shown. However, unlike this, for example, a television signal in which a horizontal high frequency component is superimposed as an auxiliary signal. Even in such a case, it can be realized in a similar configuration by demodulating a predetermined auxiliary signal.

Next, an operation explanatory diagram of the interlaced scan conversion circuit 6 and an embodiment thereof will be shown in FIGS.
This is a conversion sequence of 12 to 13 scanning lines into a 1: 1 sequential scanning signal sequence of 480 effective pixel scanning lines into a 10: 1 2: 1 interlaced scanning signal sequence of effective pixel scanning lines. Convert.

As shown in FIG. 11, the signals of the scanning lines of the progressive scanning system are weighted and added to generate the signals of the scanning lines of the interlaced scanning system shown by the dots in FIG. Coefficients are weighted with different coefficient values in the first field and the second field of the interlaced scanning system to generate scanning line signals satisfying the interlaced scanning relationship.

FIG. 12 shows an embodiment for realizing this operation. As for the signal VP of the progressive scanning system, the signals L ₁ , L ₂ , ...
Written in 8. On the other hand, from the memory circuit 38, the RD operation is performed every one horizontal scanning line period of the interlaced scanning system.
The signals L ₁ , L ₂ , ... Are read. In this RD operation, the signals of 12 lines of the scanning system are sequentially read in the period of 13 lines. That is, the output signal V from the memory circuit
P'is L ₁ , L ₁ , L ₂ , L ₃ ... L ₁₂ , L ₁₃ , L ₁₃ , L ₁₄
It is in the form of ... For this signal and the signal delayed by one line scanning line period of the interlaced scanning system by the one line delay circuit 39, the coefficient weighting circuit 40 performs the coefficient value k.
₁ and k ₂ are weighted and both are added by the adder circuit 41 to generate the interlaced scanning system signal series VIN. The coefficient values k ₁ and k ₂ are as shown in FIG. 11 above. Also,
The control circuit 42 generates signals necessary for these operations.

As described above, according to the present embodiment, it is possible to receive a high-definition television image for any television signal of the current NTSC system, EDTV system and HDTV system. In this embodiment, the television signal of the EDTV system has been described by taking the letterbox type as an example, but also for other side panel type, intermediate mode type, vertical mode type (Squeeze type) television signals and the like. The present invention can be applied by generating a digitized three-primary-color signal sequence VE in the form of progressive scanning in which the number of effective pixel scanning lines is 480 and 1: 1 by predetermined demodulation processing.

Next, a second embodiment of the present invention will be described with reference to FIG.
Shown in. This has an aspect ratio of 16: 9 and 112 scanning lines.
It is suitable for displaying a television image on the display unit in the form of 5 lines, 1: 1 progressive scanning.

The baseband television signal is
HDTV decoding circuit 1, NTSC decoding circuit 2, E
The signals are input to the DTV decoding circuit 3 and the system discriminating circuit 4, respectively.

In the HDTV decoding circuit 1, for example, HD
A predetermined demodulation process is performed on an HDTV system television signal such as a TV-MUSE system, and the number of scanning lines is 112.
A 5 digit, 2: 1 interlaced scan digitized three primary color signal series VH is generated.

In the NTSC decoding circuit 2, the current NTS
YC separation based on the C method, demodulation processing such as color demodulation, scan conversion from interlaced scanning to progressive scanning, horizontal time axis compression processing are performed, and the number of effective pixel scanning lines is 480.
In this 1: 1 sequential scanning mode, the effective pixel area of each scanning line is time-axis compressed to 3/4 to generate a digital three-primary-color signal series VN.

The EDTV decoding circuit 3 performs a predetermined demodulation process on an EDTV television signal such as a letterbox type, that is, YC separation, color demodulation, scan conversion from interlaced scanning to progressive scanning, and scanning line number conversion. Processing is performed and the number of effective pixel scanning lines is 480,
A digitized three primary color signal sequence VE in the form of a 1: 1 progressive scan is generated.

The system discriminating circuit 4 discriminates the system of the received signal based on the form of the synchronizing signal of the television signal, the identification code, etc., and generates a selection control signal corresponding to this.

The selection circuit 5 receives the current N by the selection control signal.
The signal sequence VN is selected in the case of the TSC system, and the signal sequence VE is selected in the case of the EDTV system, and output as the output signal sequence VP.

In the interlace scanning conversion circuit 6, the number of effective pixel scanning lines is 480, and the 1: 1 sequential scanning signal sequence is 1125 scanning lines (the number of effective pixel scanning lines is 1040).
Convert to a signal sequence VIN in the form of 2: 1 interlaced scanning.

The selection circuit 7 receives the HDT signal according to the selection control signal.
In case of V system, signal sequence VH, current NTSC system, ED
In the case of TV system, select the signal series VIN,
Output as VHI.

The progressive scan conversion conversion unit 43 performs scan conversion from interlaced scan to progressive scan, and the number of scan lines is 11
A signal sequence VHP in the form of 25 lines and 1: 1 progressive scanning is generated.

The D / A converter 8 converts the analog three primary color signal series VSP, and the progressive scan wide aspect ratio display 44 displays the aspect ratio 16: 9 and the number of scanning lines 1125.
Display television images in the form of 1: 1 progressive scan.

In this embodiment, each block other than the progressive scan conversion unit 43 can be realized by the same configuration as that of the first embodiment, and therefore the description thereof will be omitted.

FIG. 14 shows an embodiment of the progressive scan converter 43. This is a motion-adaptive operation for generating a signal of an interpolated scanning line that is missing in interlaced scanning and performing scanning conversion into a progressive scanning system.

The interpolation scanning line generating circuit 45 generates the signal line VHIP of the interpolation scanning line by the same operation as in FIG.
That is, the interpolating scan is performed by changing the mixing ratio according to the movement with respect to the average value of the signals of the scanning lines of the preceding and following fields suitable for a still image and the average value of the signals of the scanning lines above and below the same field suitable for a moving image. Generate a line signal. The motion information detection circuit 46 detects the motion information necessary for the motion adaptation processing from the difference signal between frames.

In the time axis conversion circuit 47, as shown in FIG.
The time series ½ compression operation and the time axis rearrangement operation are performed on the signal series VHI and VHIP to generate a signal series VHP in the form of progressive scanning.

According to this embodiment, the current NTSC system, E
It is possible to receive a high-definition and high-quality television image without interlace interference with respect to a television signal of either the DTV system or the HDTV system.

In both the first and second embodiments,
Although the NTSC decode circuit and the EDTV decode circuit have been described as independent configurations, many functions can be shared. Therefore, these decoding circuits can be configured in a shared form.

[0073]

According to the present invention, it is possible to receive a balanced and high-quality image for any television signal of the current NTSC system, EDTV system and HDTV system by simple signal processing. It is effective in reducing the cost and improving the image quality of television receivers.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an image display mode according to the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a block diagram of an embodiment of this HDTV decoding circuit.

FIG. 4 is a block diagram of an embodiment of this HDTV decoding circuit.

FIG. 5 is a block diagram of an embodiment of an NTSC decoding circuit.

FIG. 6 is an operation explanatory diagram of the progressive scan conversion unit.

FIG. 7 is an operation explanatory diagram of a horizontal time axis compression unit.

FIG. 8 is a block diagram of an embodiment of an EDTV decoding circuit.

FIG. 9 is an operation explanatory diagram of the progressive scan conversion unit.

FIG. 10 is an operation explanatory diagram of a scanning line number conversion unit.

FIG. 11 is an operation explanatory diagram of the interlaced scan conversion circuit.

FIG. 12 is a block diagram of this embodiment.

FIG. 13 is a block diagram of a second embodiment of the present invention.

14 is an explanatory diagram of an example of the progressive scan conversion unit in FIG.

[Explanation of symbols]

1 ... HDTV decoding circuit, 2 ... NTSC decoding circuit, 3 ... EDTV decoding circuit, 4 ... System determination circuit, 5
... selection circuit, 6 ... interlaced scan conversion circuit, 7 ... selection circuit, 8 ... D / A conversion section, 9 ... wide aspect ratio display section.

Claims (2)

[Claims] 1. A means for identifying a television signal format of an NTSC system, an EDTV system, and an HDTV system, a television image having an aspect ratio of 16: 9, a number of scanning lines of 1125, 2:
1 means for displaying in the form of interlaced scanning,
Aspect ratio 4: 4 for TSC television signals
3. A television receiver characterized by displaying as a television image with an aspect ratio of 16: 9 in a television signal of EDTV system or HDTV system. 2. A means for identifying the system of television signals of the NTSC system, the EDTV system and the HDTV system, a television image is displayed in the form of progressive scanning with an aspect ratio of 16: 9, 1125 scanning lines and 1: 1. And an aspect ratio of 4: 3 for an NTSC television signal.
A television receiver characterized in that it is displayed as a television image with an aspect ratio of 16: 9 in a V or HDTV television signal.