JPH04167880A - Muse/edtv system converter - Google Patents

Abstract

PURPOSE:To form a video signal with high picture quality for EDTV by converting a High Vision MUSE signal into a non-interlace EDTV system video signal directly. CONSTITUTION:A digital signal is obtained by converting a MUSE signal of High Vision system subject to band compression, a video signal is extracted from the above digital signal and a video signal of the EDTV system is generated by weight means of 3 sets of sampling information closes to each other on two consecutive scanning lines in the extracted video signal. An output from an arithmetic circuit 13 is delayed by a half clock at a 1/2 clock delay circuit 14 and outputted from a selector 15 to match the phase.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention converts the band-compressed MUSE signal of the so-called high-definition system, which has 1125 scanning lines, into the so-called clear vision signal, which has 525 scanning lines and about 60 frames per second. This invention relates to a system conversion device for converting video signals for EDTV called EDTV.

[Prior Art] The so-called high-definition system, which is used as a high-definition television, has a large number of scanning lines, 1125, and the aspect ratio of the screen is 9:16, which is different from the conventional NTSC system.

Therefore, in order to receive the same high-definition broadcast signal with a conventional NTSC system device, it is necessary to convert the number of scanning lines.

Of the 1,125 scanning lines in HDTV, 1,035 contain video signals, while in the NTSC system, 52
Video signals are included in 483 of the five scanning lines.

Therefore, among the scanning lines containing high-definition video signals, 69 lines corresponding to the upper and lower ends of the display screen are omitted,
By converting the remaining scanning lines to 1/2, the high-definition video signal can be viewed on an NTSC television receiver.

Therefore, in the odd field of a high-definition video signal, the same video signal and a signal delayed by one horizontal scanning period of the signal are added via a 1/2 level converter, and 2
Outputs the scanning line of the book as one line.

In the even field of the same video signal, the scanning line arrangement is maintained by interlacing 1 = 2 with the odd field, and the input video signal of the same scanning line is output as is to the wooden nail, and the number of scanning lines is 1. /2 NTSC format video signal.

On the other hand, from the conventional NTSC video signal, a signal is generated to compensate for the gaps between the scanning lines of the same signal, and the number of scanning lines is 525.
EDTV television receivers, so-called clear vision, which display high-quality images using a non-interlace system with a frame rate of approximately 60 frames per second, are beginning to become popular.

[Problem to be solved by the invention]

High-definition broadcasting signals are transmitted as MUSE signals with compressed bandwidth, and MUS receives and demodulates the same signals before outputting them.
The E signal is decoded into high-definition video and audio signals.

In order to view the high-definition signal on a conventional television receiver, the restored high-definition video signal is further
It is necessary to convert it into an SC video signal, and the conversion device is complicated and expensive.

Further, as mentioned above, since the circuit configuration through which signals pass is different between odd and even fields, timing shifts in video signals occur, which tends to cause image quality deterioration such as flicker.

In addition, since the video signal is an interlaced NTSC format video signal, even if it is a recent TV receiver with high image quality after the video signal input stage or an EDTV format TV receiver, rich high-definition video information can be effectively used. It wasn't something I was using.

The present invention directly converts the video signal for each field of high-definition, which is a 1:2 interlace system at 30 frames per second, into an image signal of one frame each, and
The purpose is to create a frame, non-interlaced EDTV video signal.

[Means to solve the problem]

A/D converts high-definition system band compressed MUSE signal
Convert it into a digital signal, extract a video signal from the digital signal, and use the weighted average of three adjacent sampling information on two consecutive scanning lines of the extracted video signal to generate an ED.
It is designed to generate a TV format video signal.

Figures 2 to 5 are pattern diagrams showing the scanning line conversion method of the MUSE/EDTV format conversion device (7) same as above, in which two adjacent video signals extracted by converting a high-definition MUSE signal into a digital signal are shown. For the horizontal scanning signal, in the odd field shown in FIG. 2 (first field), the first pixel data (white circle) on the first horizontal scanning line is multiplied by 174 as shown by the solid arrow, and The second pixel data ■ (white circles) of two adjacent pixel data on the second horizontal scanning line that are in a close relationship with the first pixel data ■ are multiplied by 5/8 as shown by the thick arrow, and the same second pixel data The third pixel data ■ (white circle mark) adjacent to the first pixel data ■ (white circle mark) are multiplied by 1/8 as shown by the dotted arrow, and the weighted average is used to interpolate the first pixel data ■ (black circle mark). Data (white circle)
is multiplied by 1/4, and the second pixel data (white circle mark) is multiplied by 1/4.
Multiply the third pixel data (white circle) by 5/8, weighted average, interpolate the second pixel data (black circle) adjacent to the interpolated first pixel data ■, and do the same. All pixel data on the first horizontal scanning line and the second horizontal scanning line are interpolated, and then interpolation processing is performed on all horizontal scanning lines in the vertical direction to form an odd field screen.

FIG. 3 is a diagram showing the third field, in which the sampling point of the MUSE signal is sampled in the middle of the first field, and the white circle mark shown as the pixel data is shown as a white field angle mark, and the interpolated Pixel data is indicated by a black angle of view mark, and the method of interpolating pixel data is the same as in FIG. 2.

In the even field shown in FIG. 4 (second field), for each adjacent pixel data of the first horizontal scanning signal, the first pixel data ■ (white diamond mark) is 5/8 as shown by the thick arrow. The second pixel data (white diamond mark) adjacent to the same first pixel data is multiplied by 1/ as shown by the dotted arrow.
The first pixel data of the second horizontal scanning signal is multiplied by 8.
The third pixel data (white diamond mark) adjacent to the second pixel data Similarly, the first pixel data (white diamond mark) is multiplied by 1/8, the second pixel data (white diamond mark) adjacent to the first pixel data is multiplied by 5/8, and the first pixel data (white diamond mark) is multiplied by 5/8. The third pixel data (white diamond mark) of the horizontal scanning signal No. 2 is multiplied by 1/4 and weighted averaged to interpolate the second pixel data (black diamond mark) adjacent to the interpolated first pixel data ■. Similarly, all pixel data on the first horizontal scanning line and the second horizontal scanning line are interpolated, and then interpolation processing is performed on all horizontal scanning lines in the vertical direction to form an even field screen, E
This is a DTV video signal.

FIG. 5 is a diagram showing the fourth field, in which the sampling point of the MUSE signal is sampled in the middle of the second field, and the white diamond mark shown as the pixel data is shown as a Sanno square mark, and the interpolated The pixel data is indicated by a black triangle, and the method of interpolating the pixel data is the same as in the case of FIG.

(Function) 19= In the present invention, as shown in FIGS. 2 to 5, 516 adjacent luminance signal scanning lines of a video signal for each field of a high-definition signal of 30 frames per second and 1:2 increment system are used. One of the two lines is extracted to create a non-interlaced video signal with 515 luminance signal scanning lines for one frame.

The effective number of scanning lines for NTSC non-interlaced signals is 4.
The difference between the number 83 and 515 is rounded down,
Furthermore, as shown in Figures 2 to 5, there are parts where pixel data is not interpolated at both the left and right ends of the screen, but the HDT
It is possible to display high-definition images on V, etc.

[Embodiment] Fig. 1 is a block diagram of the main part of the MUSE/EDTV format conversion device of the present invention, and
The video signal extracted by converting the E signal into a digital signal is branched through the input terminal 1, the first branched signal is input to the selector 2, and the branched second signal is input to the IH delay circuit 4. Then, the third branched signal is input to the selector 3.

The input signal is IH-delayed by the IH delay circuit 4 and inputted to the selectors 2 and 3, and the output of the selector 2 is branched, and one is inputted to the selector 7 via the 1-clock delay circuit 5, and the other is branched. is directly input to the selector 7, and the output of the selector 7 is input to the arithmetic circuit 10.

The output of the selector 3 is branched, the first branch is directly input to the arithmetic circuit 8, the second branch is branched via a one-clock delay circuit 6, and one of the branches is input to the arithmetic circuit 8. is being input. In the arithmetic circuit 8, the selector 3
The output from the 1-clock delay circuit 6 and the output from the 1-clock delay circuit 6 are added together, averaged, outputted, and inputted to the arithmetic circuit 10.

The other branched from the one-clock delay circuit 6 is input to the arithmetic circuit 13.

In the arithmetic circuit 10, the output from the selector 7 and the output from the arithmetic circuit 8 are added together, averaged, and output, and input to the arithmetic circuit 13 via the 1/2 clock delay circuit 12. It is added to the output from the 1 clock delay circuit 6, averaged, and output, and the same output is branched and one is directly input to the selector 15, and the other is input to the 1/2 clock delay circuit 1.
The non-interlaced video signal of EDTV is inputted to the selector 15 via the selector 15, and is outputted from the selector 15 to the output terminal 16.

In addition, when calculating in calculation circuits 8, 10 and 13, each pixel data is weighted and averaged, and 1/4, 1/8 and 5/8 are used as weighting coefficients. The pixel data may be multiplied by a coefficient using a multiplier. Alternatively, instead of using a multiplier, a bit shift and an adder may be used to shift the bits of pixel data and add the shifted signals. The use of multipliers complicates the circuit and increases the circuit size, but the advantage is that the circuit size can be reduced if only bit shifts and additions are performed. Alternatively, instead of using a multiplier - 11 = multiplier, a coefficient ROM can be used and the same coefficient R
The coefficients inside the OM and the input signal may be calculated and output.

The operation of the above circuit will be explained below with reference to FIGS. 2 to 5.

The first scanning line of the first field of the MUSE signal in FIG.
When interpolating pixel data ■ and ■ between It is added to the circuit 10.

On the other hand, the selector 3 outputs the input signal applied via the input terminal 1, and the arithmetic circuit 8 receives the signal of pixel data (■) directly input from the selector 3 and the 1-clock delay circuit 6. A clock-delayed pixel data (2) signal is added, and by averaging the re-input signals in the arithmetic circuit 8, pixel data (2) intermediate between pixel data (2) and pixel data (2) can be calculated.

The signals of pixel data (2) and pixel data (2) are added to the arithmetic circuit 10, and the pixel data (2) can be calculated by averaging the re-input signals in the arithmetic circuit 10.

The pixel data ■ is input to the arithmetic circuit 13 via the 1/2 clock delay circuit 12 in order to match the phase;
The pixel data ■ signal is input to the arithmetic circuit 13 via the clock delay circuit 6, and the arithmetic circuit 13 calculates the pixel data by averaging the input pixel data ■ and pixel data ■ signals. The pixel data ■ is directly output from the output terminal 16 via the selector 15.

Next, the signal of pixel data ■, which is one clock away from the pixel data ■, is input from the one-clock delay circuit 6 to the arithmetic circuit 13, and the arithmetic circuit 13 inputs the signals of the input pixel data ■ and pixel data ■. Pixel data (2) is obtained by calculating the average, and this pixel data (2) is directly output from the output terminal 16 via the selector 15.

In the same way, calculation processing is performed on other pixel data on the first and second scanning lines in FIG. 2 to interpolate the first EDTV scanning line, and then Arithmetic processing is performed on the pixel data and the second EDTV scanning line is interpolated to convert 516 luminance signal scanning lines of one field of the MUSB signal into 515 non-interlaced signal scanning lines for EDTV. ing.

FIG. 3 is a diagram of the third field of the MUSE signal. In FIG. 3, the middle of the sampling points in FIG. 2 is sampled, and the pixel data is converted in the same way as in FIG. The output from the circuit 13 is delayed by 1/2 clock by the 1/2 clock delay circuit 14 and then sent to the selector 1.
5 to match the phase with the output shown in FIG.

Pixel data of the second field of the MUSE signal in Figure 4■
When interpolating and ■, the input signal applied from selector 2 via input terminal 1 should be directly output,
The output is directly input to the selector 7, and is output from the selector 7, so that the pixel data of ■ is input to the arithmetic circuit 10.

The selector 3 outputs the signal from the IH delay circuit 4, branches the output, inputs the first signal to the arithmetic circuit 8, and branches the second signal through the one-clock delay circuit 6. By inputting one of the signals to the arithmetic circuit 8, adding the signals of pixel data ■ and ■ to the arithmetic circuit 8, and taking the average of both signals in the arithmetic circuit 8, the pixel data ■
It is possible to calculate pixel data (■) between and pixel data (2).

The signals of pixel data (2) and pixel data (2) are added to the arithmetic circuit 10, and the pixel data (2) can be calculated by averaging the two human input signals.

The pixel data ■ is input to the arithmetic circuit 13 via the 1/2 clock delay circuit 12 in order to match the phase, while the other branched output of the 1 clock delay circuit 6 is input to the arithmetic circuit 13. The arithmetic circuit 13 calculates the average of the input pixel data ■ and pixel data ■ to obtain pixel data ■, and the pixel data ■ is directly outputted via the selector 15. It is output from terminal 16.

Next, the signal of pixel data ■, which is one clock away from the pixel data ■, is input from the one-clock delay circuit 6 to the arithmetic circuit 13, and the arithmetic circuit 13 inputs the signals of the input pixel data ■ and pixel data ■. Pixel data (2) is obtained by calculating the average, and this pixel data (2) is directly output from the output terminal 16 via the selector 15.

In the same way, calculation processing is performed on other pixel data on the first and second scanning lines in FIG. 4, and the first EDTV scanning line is interpolated. By performing arithmetic processing on the pixel data and interpolating the second scanning line for EDTV, 516 luminance signal scanning lines per field of the MUSE signal are converted into 515 non-interlaced signal scanning lines for EDTV. I'm trying to convert it.

FIG. 5 is a diagram of the fourth field of the MUSE signal. In FIG. 5, the middle of the sampling points in FIG. 4 is sampled, and the pixel data is converted in the same way as in FIG. The output from the circuit 13 is delayed by 1/2 clock by the 1/2 clock delay circuit 14 and then sent to the selector 1.
5, and the pixel data is changed so as to match the phase with the output of FIG.

[Effects of the Invention] With the simple circuit configuration of the present invention, by directly converting a high-definition MUSE signal into a non-interlaced EDTV video signal, the rich video information of high-definition can be effectively utilized, and high-definition video signals for EDTV can be effectively utilized. It can be a video signal of image quality.

[Brief explanation of drawings]

Fig. 1 shows the main electrical circuit block diagram of the MUSE/EDTV system conversion device of the present invention, and Figs. 2 to 5 show the same MUS as above.
These are pattern diagrams showing the scanning line conversion method of the E/EDTV method conversion device, in which Fig. 2 shows the first field, Fig. 3 shows the third field, Fig. 4 shows the second field, and Fig. 5 shows the fourth field. . ■---Input terminal, 2, 3, 7.11 - Selector, 4, 5, 6, 9.12 - Delay circuit, 8, 10.13
- Arithmetic circuit, 14- Output terminal. Patent applicant Fujitsu General Co., Ltd. Figure 4 516 (Book) 515 (Book) Figure 5 516 (Book) 515 (Book) -
□→ (Solid line arrow) Number one → (Thick line arrow) Number one, weight, weight

Claims (2)

[Claims] (1) For each two adjacent horizontal scanning signals of the video signal extracted by converting the high-definition MUSE signal into a digital signal, one pixel data on one horizontal scanning signal line and arbitrary data on the other horizontal scanning signal line 2 pixel data, and interpolates the pixel data by maintaining the triangular relationship formed by the selected 3 pixels for at least one field period, and converts the pixel data into a non-interlace signal for EDTV. A MUSE/EDTV format conversion device characterized by: (2) For each two adjacent horizontal scanning signals of the video signal extracted by converting the high-definition MUSE signal into a digital signal, in an odd field, the first pixel on the first horizontal scanning line of each of the two horizontal scanning signals The data is multiplied by 1/4, and 2 pixels adjacent to the first pixel data on the second horizontal scanning line are
The second pixel data of the pixel data is multiplied by 5/8, the third pixel data adjacent to the same second pixel data is multiplied by 1/8, and the first pixel data is interpolated by weighted averaging.
The pixel data is multiplied by 1/4, and the second pixel data is multiplied by 1/4.
8, the third pixel data is multiplied by 5/8, and the second pixel data adjacent to the interpolated first pixel data is interpolated by weighted averaging. All pixel data on two horizontal scanning lines are interpolated, and then all horizontal scanning lines in the vertical direction are interpolated to form an odd field screen. In even fields, two adjacent pixel data on the first horizontal scanning line are interpolated. Multiply the first pixel data of the pixel data by 5/8, multiply the second pixel data adjacent to the same first pixel data by 1/8, and multiply the first pixel data adjacent to the first pixel data and the second pixel data on the second horizontal scanning line. The third pixel data obtained is multiplied by 1/4 and weighted averaged to interpolate the first pixel data, and similarly, the first pixel data is multiplied by 1/4.
The interpolated first pixel data is multiplied by 8, the second pixel data adjacent to the first pixel data is multiplied by 5/8, and the third pixel data on the second horizontal scanning line is multiplied by 1/4. Interpolating second pixel data adjacent to the pixel data, interpolating all pixel data on the first horizontal scanning line and the second horizontal scanning line, and then interpolating all the horizontal scanning lines in the vertical direction. 2. The MUSE/EDTV format conversion device according to claim 1, wherein the MUSE/EDTV format conversion device performs the following steps to configure an even field screen and generates an EDTV video signal.