JPH04302594A - Muse-ntsc converter - Google Patents

Abstract

PURPOSE:To automatically identifying the screen display mode of the NTSC video signal in a processor which processes converted NTSC video signal and to make efficient use of the processor. CONSTITUTION:In a MUSE-NTSC converter 1 which converts the NTSC video signal into a MUSE signal, a identification signal addition part 2 which adds the identification signal identifying the screen display mode to the NTSC video signal is provided. The processor which processes the converted NTSC video signal detects the screen display mode automatically by the identification signal, and the signal processing according to this detected screen display mode can be performed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is applicable to high-definition broadcasting.
Converts the USE signal to an NTSC video signal according to the screen display mode such as zoom up mode and wide mode,
MUSE (multiple sub-nyquis) allows high-definition broadcasts to be viewed on current TV receivers.
t sampling encoding)-NT
Regarding the SC converter, in more detail, the screen display mode of the NTSC video signal is automatically identified on the signal processing side,
MUSE-N aims to expand its use on the signal processing side
This relates to a TSC converter.

0002

[Conventional example] In recent years, high-definition receivers (HDTV) have been introduced that have larger screens (aspect ratio 9:16) than current TV receivers.
Various methods have been proposed, and the MUSE method is about to be adopted as a method for transmitting wide images. By the way, in order to view high-definition broadcasting, a dedicated high-definition MUSE decoder is required, and current television receivers cannot enjoy the realistic images provided by high-definition broadcasting.

[0003] Therefore, various MUSE-NTSC converters have been proposed that allow high-definition broadcasting to be viewed on current television receivers. .5kHz) into 525 scanning lines (scanning line frequency 15.75kHz), 1 of the MUSE signal
This converts the 6:9 aspect ratio to the 4:3 aspect ratio of the NTSC signal.

[0004] Furthermore, when converting the aspect ratio, conversion modes such as full mode, wide mode, and zoom-up mode are adopted. For example, if the image of high-definition broadcasting is as shown in FIG. A horizontally compressed image is displayed on a screen with an aspect ratio of 4:3 (as shown in FIG. 9). In this case, although the image is not very good, it has the advantage that the information of the MUSE signal is not lost during the conversion. In the wide mode, a high-definition broadcast image is displayed horizontally with non-image areas added above and below the NTSC receiver (as shown in FIG. 10). In the zoom-up mode, both end portions of the high-definition broadcast image are cut off, and the central portion of the image is normally displayed (as shown in FIG. 11).

[0005]

[Problem to be solved by the invention] However, the above M
In the USE-NTSC converter, the converted NTS
Since the screen display mode of the C video signal is full mode, wide mode, zoom up mode, etc.
On the side of a television receiver that processes a TSC video signal, it is necessary to issue an appropriate instruction (screen display mode setting) according to the screen display mode, and it is troublesome to have to perform operations for each screen display mode.

[0006] Also, for example, an NTSC video signal is recorded on a VTR device, and then the VTR device records the NTSC video signal.
If you try to play the video signal and watch it on a TV receiver,
Sometimes people forget the screen display mode of the NTSC video signal.

The present invention has been made in view of the above problems, and its purpose is to predetermine identification signals corresponding to each screen display mode and add the identification signals to the output NTSC video signal. An object of the present invention is to provide a MUSE-NTSC converter in which the screen display mode can be automatically identified on the processing side that processes a video signal, and the use of the signal processing side equipment can be expanded.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a MUSE-NTSC converter that converts a MUSE signal into an NTSC video signal in a screen display mode such as full mode, zoom-up mode, or wide mode. , an identification adding section that determines in advance an identification signal corresponding to the screen display mode and adds the identification signal of the current screen display mode to the NTSC video signal.

[0009] Furthermore, the identification signal has the same frequency and phase as the color subcarrier of the NTSC video signal, and its N
This is superimposed on the front porch of the TSC video signal.

0010

[Operation] With the above configuration, the processing side that processes the NTSC video signal from the MUSE-NTSC converter,
In a television receiver or the like, the identification signal added to the NTSC video signal can be detected in synchronization with the color burst signal. That is, since the screen display mode of the input NTSC video signal is automatically detected by the signal processing device, there is no need for the operator of the signal processing device to set the screen display mode. Also,
Since the signal processing device can automatically identify the screen display mode of the input NTSC video signal, the NTSC video signal can be subjected to various types of signal processing, and its use can be expanded.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 1 to 7. In Fig. 1, the MUSE-NTSC converter 1 receives the MUSE signal from the BS tuner.
In addition to converting into an SC video signal, an identification signal adding section 2 is provided which adds an identification signal for identifying a screen display mode such as full mode, wide mode, or zoom-up mode during the conversion.

As shown in FIGS. 2 and 3, the identification signal has the same frequency and phase as the color subcarrier (color burst signal; arrow A in FIG. 2) of the output NTSC video signal, and It is superimposed on the front porch of the vertical retrace period (for example, 14H to 21H) of the signal.

[0013] Furthermore, the front porch during the vertical retrace period such as 14H is guaranteed to be a minimum of 2.1 μsec. Therefore, as shown in FIG. 3A, in the full mode, four cycles of the color subcarrier frequency (fsc) are added to the front porch of the NTSC video signal in the same way as the color burst signal. As shown in FIG. 3B, when outputting a converted NTSC video signal in wide mode, two cycles of the color subcarrier frequency (fsc) are added to the front porch. As shown in FIG. 3C, in the zoom-up mode, two cycles of the color subcarrier frequency (fsc) are added to the front porch.

As shown in FIGS. (b) and (c), even two cycles of the same color subcarrier frequency (fsc) are superimposed at different positions. Further, as shown in FIG. 3(d), if there is another conversion mode, the color subcarrier frequency signal is not added to the front porch.

That is, in the television receiver connected to the MUSE-NTSC decoder 1, that is, the processing side equipment that processes the NTSC video signal, since the identification signal is the same as the color burst signal, the color It is possible to synchronize and detect the identification signal in the same way as the burst signal.

Therefore, for example, the identification signal is as shown in FIG. 3(b).
If the TV receiver has the input NT
The screen display mode of the SC video signal is determined to be the wide mode, and signal processing corresponding to the wide mode is performed.

[0017] As described above, since the identification signal for identifying the screen display mode is added to the output NTSC video signal, the screen display mode can be automatically identified on the television receiver side to which the NTSC video signal is input. This eliminates the need for troublesome operations each time the screen display mode changes.

Further, as shown in FIG. 4, the NTSC video signal in each screen display mode is recorded on the current VTR device 3, and then the recorded NTSC video signal is played back.
input to the color television receiver 4. Then, even if you have forgotten or do not know the screen display mode, the identification signal determination unit 4a of the color television receiver 4 will automatically detect the screen display mode and perform signal processing according to this screen display mode. Since this is performed, images in each screen display mode are reproduced on the color television receiver 4 according to a predetermined method.

Furthermore, as shown in FIGS. 4 and 5, NTSC video signals in each screen display mode are converted into NTSC-H
When input to the D converter 5 and converted to a high-definition video signal, the video signal is returned to the original aspect ratio (16:9) screen, and the video by the NTSC video signal is converted to a display device with an aspect ratio of 16:9 (for example, a high-definition video signal).・Display device) 6 etc. In this case, the NTSC-HD converter 5 is equipped with an identification signal discriminator 7 that discriminates the identification signal added to the input NTSC video signal. Automatic processing is possible according to a predetermined method.

As another use, for example, when the image display mode of the NTSC video signal is full mode, this NT
When an SC video signal is input to the NTSC-HD converter 5, the NTSC-HD converter 5 detects the identification signal added to the input NTSC video signal in the identification signal discriminator 7, and automatically detects the identification signal added to the input NTSC video signal. NTS
The signal time compression circuit inside the C-HD converter 5 is scaled and double speed conversion is performed.

Through this process, the full mode image of the MUSE-NTSC converter 1 (shown in FIG. 9) automatically becomes a 16:9 image, and the high-definition screen shown in FIG. 8 is displayed on the screen of the high-definition display device 6. can be displayed.

[0022] Also, if the output of the MUSE-NTSC converter 1 is once recorded on the current VTR device 3, and then the screen display mode reproduced by the current VTR device 3 is an NTSC video signal in full mode, the same as above applies. Automatic processing is possible, and a high-definition screen (shown in FIG. 8) can be reproduced in the same way.

Furthermore, for example, if the image display mode of the NTSC video signal from the MUSE-NTSC decoder 1 is the zoom-up mode, the video (MUSE signal) shown in FIG. 6 is converted into an NTSC video signal by the MUSE-NTSC decoder 1. Then, convert this NTSC video signal to NTSC-H
Input to D converter 7. Then, the NTSC-HD converter 7 detects the identification signal (zoom up mode) added to the video signal and processes the input NTSC video signal according to the zoom up mode.

In this case, since there is no information on the original MUSE signal and information on both ends of the high-definition screen, for example, as shown in FIG. The remaining part of the other side (arrow B in the same figure)
, C, and D), it is possible to display other images using PoutP (picture out picture).

In this way, by adding the identification signal of each screen display mode to the NTSC video signal from the MUSE-NTSC converter 1, the signal processing equipment connected to the MUSE-NTSC converter 1 can distinguish the input video signal. Since the screen display mode can be identified, various uses can be considered for the signal processing side equipment.

[0026]

As explained above, according to the present invention, a MUSE signal from a BS tuner or the like is converted into an NTSC video signal, and during this conversion, the screen display mode such as full mode, zoom up mode, or wide mode can be set. M
The USE-NTSC converter is equipped with an identification signal adding section that adds an identification signal for identifying the screen display mode to the output NTSC video signal.
The identification signal is detected by a signal processing device such as a TV receiver connected to the TSC converter, and the NTSC video signal can be automatically processed according to the detected screen display mode, so that the TV reception There is no need for troublesome operations by the machine operator, and the converted NTSC
When a video signal is recorded on a VTR device, then played back and input into a television receiver or the like, the signal processing is reliably performed even if the screen display mode of the NTSC video signal is forgotten.

Furthermore, when the screen display mode of the NTSC video signal is full mode, since the information of the input MUSE signal is not lost, the signal processing side equipment that detects the identification signal added to the NTSC video signal By making it possible to display high-definition broadcasting images on a screen with the original aspect ratio of 16:9, and by using the identification signal added to the NTSC video signal, various other uses can be considered, and we aim to expand its use on the signal processing side. It has the effect of being able to

[Brief explanation of drawings]

[Fig. 1] MUSE-NTSC showing one embodiment of this invention
Schematic block diagram of the converter

[Fig. 2] A schematic waveform diagram of a video signal for explaining the operation of the MUSE-NTSC converter.

FIG. 3 is a schematic waveform diagram of an identification signal explaining the operation of the MUSE-NTSC converter.

[Figure 4] A schematic diagram explaining how to use the above MUSE-NTSC converter

[Fig. 5] Schematic signal flowchart explaining the operation of the MUSE-NTSC converter.

[Fig. 6] A schematic screen diagram explaining the operation of the above MUSE-NTSC converter.

[Fig. 7] A schematic screen diagram explaining the operation of the MUSE-NTSC converter.

[Figure 8] Schematic screen diagram explaining the screen of high-definition broadcasting

[Fig. 9] Schematic screen diagram explaining the operation of a conventional MUSE-NTSC converter

[Fig. 10] A schematic screen diagram explaining the operation of a conventional MUSE-NTSC converter.

[Fig. 11] A schematic screen diagram illustrating the operation of a conventional MUSE-NTSC converter.

[Explanation of symbols]

1 MUSE-NTSC converter 2 Identification signal addition section

Claims (2)

[Claims] 1. In a MUSE-NTSC converter that converts a MUSE signal into an NTSC video signal according to a screen display mode such as full mode, zoom-up mode, or wide mode, an identification signal corresponding to the screen display mode is determined in advance, and the A MUSE-NTSC converter comprising an identification adding means for adding an identification signal of a current screen display mode to an NTSC video signal. 2. The identification signal has the same frequency and phase as the color subcarrier of the NTSC video signal, and
A MUSE-NTSC converter characterized in that an SC video signal is superimposed on a front porch.