JP2725376B2 - Television receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver capable of receiving both the current standard television system and the high-definition television system.

[Summary of the Invention]

The present invention time-compresses and displays a standard television broadcast signal having a 4: 3 aspect ratio on a television receiver having an aspect ratio of 16: 9, and outputs a synchronization signal included in the standard television broadcast signal. By displaying the delayed output in an area other than the time-compressed output area with a delay of a predetermined amount, the video signal in the standard television broadcast and the related synchronizing signal, burst signal, VITS signal (broadcasting station) All signals such as the control signal between the GCR and the GCR signal (ghost canceller reference signal)
It can be displayed on T and monitored.

[Conventional technology]

In recent years, advanced communication systems have been developed with the advancement of the advanced information society.Especially in satellite communication systems, the advancement of television broadcasting has been promoted, and the realism and power of a movie can be obtained. Is one of the high-definition television (HDTV) broadcasts that can reproduce the video of the TV.
In high-definition television, the aspect ratio is 16: 9, and the number of horizontal scans is 1125. In contrast, the current
In the NTSC system, the aspect ratio is 4: 3 and the number of horizontal scanning lines is 525.

In preparation for the start of such high-definition television broadcasting,
Television receivers capable of receiving both current standard television broadcasting and high-definition television broadcasting are being developed.

However, in a television receiver capable of receiving both high-definition television broadcasting and the current standard television broadcasting, the aspect ratio of the high-definition television screen is 16: 9.
On the other hand, since the aspect ratio of the current NTSC television screen is 4: 3, when the NTSC screen is projected on the reception screen of the high-definition television, a margin is generated on the screen.

Conventionally, this margin is used to display an on-screen signal, a character multiplexed signal, a picture-in-picture signal, etc. (Japanese Patent Laid-Open No. 61-214872), Displaying color or sub-signal images such as analog clocks (JP-A-61-22478)
No. 6).

Conventionally, a horizontal synchronizing signal, a vertical synchronizing signal, and the like related to the screen of the NTSC system are switched and displayed using the margin.

That is, when monitoring the horizontal synchronization signal, switching of the delay circuit for delaying the horizontal synchronization signal, when monitoring the vertical synchronization signal, switching of the delay circuit for delaying the vertical synchronization signal,
When monitoring both horizontal and vertical synchronizing signals at the same time, switch the circuit to obtain a so-called pulse cross by adding the horizontal and vertical synchronizing signals. When monitoring all video signals, switch between the horizontal and vertical synchronizing signals. They switched to the so-called underscan mode, which reduced the amplitude so that all screens could be viewed with a 4: 3 aspect ratio.

[Problems to be solved by the invention]

However, in the case of the above-described conventional method of switching and displaying a synchronization signal or the like, it is necessary to switch the switch for each mode, and there is a disadvantage that all signals cannot be monitored simultaneously by a CRT.

The present invention has been made in view of such a point, and in a television receiver capable of receiving both a high-definition television broadcast and a current standard television broadcast, the present invention is applied to a blank portion caused by a difference in aspect ratio. An object of the present invention is to provide a television receiver capable of displaying various synchronization signals related to standard television broadcasting and simultaneously monitoring all signals related to current standard television broadcasting.

[Means for solving the problem]

The television receiver of the present invention is a television receiver having an aspect ratio of 16: 9, which is used to display a standard television broadcast having an aspect ratio of 4: 3 in a horizontal direction of a video signal related to the standard television broadcast. Time axis compression means for compressing the time axis, separating the horizontal synchronization signal and the vertical synchronization signal from the video signal related to the standard television broadcast, delaying the separated horizontal synchronization signal and the vertical synchronization signal by a predetermined amount, Delay means for outputting a delayed horizontal synchronizing signal and a vertical synchronizing signal; storing the horizontal synchronizing signal and the vertical synchronizing signal output from the delay means; and storing the stored horizontal synchronizing signal and the vertical synchronizing signal in a predetermined read address signal And a synthesizing means for synthesizing with the time-axis-compressed video signal, and combining the time-axis-compressed video signal on a 16: 9 aspect ratio screen. Out movies in aspect ratio, by Utsude the synchronization signal the delay in its margin is obtained by allowing the monitor synchronizing signals along with the video.

[Action]

In the time compression means (4), the time in the horizontal direction of the video signal related to the standard television broadcast is displayed so that the standard television broadcast having the aspect ratio of 4: 3 is displayed on the television receiver having the aspect ratio of 16: 9. Compress the axis. Further, the synchronization signal is separated from the video signal related to the standard television broadcast (5), and the horizontal synchronization signal and the vertical synchronization signal delayed by a predetermined amount (7, 8) are obtained. Further, the delayed horizontal synchronizing signal and the vertical synchronizing signal are added (10) to obtain a pulse cross signal, which is then converted to a picture-in-picture circuit (9).
To memorize. The stored signals are processed by the central processing circuit (1
It is read out based on the address signal from 1), and is added and combined with the video signal compressed on the time axis by the addition and synthesis circuit (6). Then, the time-axis-compressed video signal is displayed on a screen having a 4: 3 aspect ratio and a 16: 9 aspect ratio, and a synchronization signal and the like are displayed on the remaining margin. As a result, all signals such as video signals and synchronization signals related to standard television broadcasting can be simultaneously displayed on the CRT and monitored.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 shows a circuit configuration of the present embodiment. In FIG. 1, (1) denotes an input terminal, and this input terminal (1)
9, a high-definition television signal V _HD to the number of horizontal scanning lines is set to the 1125 supplied: aspect ratio of 16 to. High definition television signals V _HD from the input terminal (2) is supplied to the contact a of the switch (2).

An input terminal (3) is supplied with a standard television signal V _NT (for example, a demodulated signal of the NTSC system) having an aspect ratio of 4: 3 and the number of horizontal scanning lines is 525 to this input terminal (3). You. Standard television signal from this input terminal (3)
_VNT is supplied to the time axis compression circuit (4) and to the synchronization separation circuit (5).

Time axis of the horizontal direction of the standard television signal V _NT from the input terminal (3) in the time base compression circuit (4) is compressed, it is supplied to the additive synthesis circuit (6). A horizontal synchronizing signal and a vertical synchronizing signal are separated from a standard television signal _VNT from an input terminal (3) by a synchronizing separation circuit (5), and the horizontal synchronizing signal is supplied to a horizontal synchronizing signal delay circuit (7). Delayed by 1 / 2H, the vertical synchronization signal is supplied to a vertical synchronization signal delay circuit (8), where it is delayed by 1 / 2V.

The horizontal synchronizing signal and the vertical synchronizing signal delayed by the delay circuits (7) and (8) are supplied to a picture-in-picture (PIP) circuit (9) comprising a plurality of memories, respectively, and stored in predetermined areas. Also, delay circuits (7) and (8)
The horizontal synchronizing signal and the vertical synchronizing signal delayed by are added by an adding circuit (10), and then supplied to a PIP circuit (9) and stored in a predetermined area.

The horizontal synchronizing signal, the vertical signal and the sum signal of these signals stored in the PIP circuit (9) are sequentially read out by the address signal from the central processing unit (CPU) (11) and supplied to the addition / synthesis circuit (6). _Are added and synthesized with the standard television signal _VNT from the time axis compression circuit (4).

When high-definition television, the switch (2) is switched to the contact a side, high definition television signal V _HD is switched from the input terminal (1) (2), the aspect ratio via the driver (12) is 16 : 9 to the picture tube (13). Then, the picture tube (13) is the screen of a high definition television signal V _HD from the input terminal (1) is issued movies. Since the aspect ratio of the picture tube (13) is 16: 9, a high-definition television screen is displayed on the entire screen of the picture tube (13) when receiving high-definition television.

At the time of standard television reception, the switch (2) is switched to the contact b side, and the output of the addition / synthesis circuit (6) is supplied to the picture tube (13) via the switch (2) and the driver (12). At this time, the second picture is displayed on the surface of the picture tube (13).
As shown in the figure, the video signal is projected on the screen (14) with an aspect ratio of 4: 3, and the vertical synchronization signal, VITS signal and G
The CR signal is projected in the margin (15), the horizontal synchronization signal and the burst signal are projected in the margin (16), and the signal obtained by adding the horizontal synchronization signal and the vertical synchronization signal is displayed in the margin (17). It is projected.

Thus, in this embodiment, at the time of standard television reception, all signals such as video signals and synchronization signals relating to the standard television signal can be simultaneously displayed on the picture tube of the picture tube (13) and monitored. The input signal source may be a directly received broadcast signal or a signal from a camera or a VTR.

In the above-mentioned embodiment, by adopting a configuration in which a part is switched, not shown, as in the above-mentioned Japanese Patent Application Nos. 61-214872 and 61-224786, images of other channels are also displayed. Of course, you can get out. When the synchronization signal projection mode is set, the synchronization signal and the like according to the present invention are projected in the margin as described above.

〔The invention's effect〕

As described above, according to the present invention, a video signal of a standard television broadcast having an aspect ratio of 4: 3 is time-compressed and displayed on a television receiver having an aspect ratio of 16: 9, and a synchronization signal thereof is obtained. Since the delay output is projected in an area other than the time-compressed output area, that is, the margin, with a fixed delay, in a television receiver capable of receiving both high-definition television broadcast and standard television broadcast, All signals such as video signals and related synchronization signals in standard television broadcasting can be simultaneously displayed and monitored on a CRT, and it is particularly useful when applied to a monitor television for broadcast stations or a VTR reproduction signal monitor television. .

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining the present invention. (2) is a switch, (4) is a time axis compression circuit, (5) is a synchronization separation circuit, (6) is an addition and synthesis circuit, (7) is a horizontal synchronization signal delay circuit, and (8) is a vertical synchronization signal delay circuit. ,
(9) is a picture-in-picture circuit, (10) is an addition circuit, (11) is a central processing unit, and (13) is a picture tube.

Claims (1)

(57) [Claims] 1. A horizontal time axis of a video signal related to a standard television broadcast is compressed in order to display a standard television broadcast having an aspect ratio of 4: 3 on a television receiver having an aspect ratio of 16: 9. Time axis compression means for separating a horizontal synchronization signal and a vertical synchronization signal from a video signal related to the standard television broadcast, delaying the separated horizontal synchronization signal and the vertical synchronization signal by a predetermined amount, Delay means for outputting a signal and a vertical synchronization signal; storing the horizontal synchronization signal and the vertical synchronization signal output from the delay means; and reading out the stored horizontal synchronization signal and the vertical synchronization signal based on a predetermined read address signal. And a synthesizing means for synthesizing with the time-axis-compressed video signal, and displaying the time-axis-compressed video signal on a screen with an aspect ratio of 16: 9 at an aspect ratio of 4: 3. And, by Utsude the synchronization signal the delay in the blank space, the television receiver, characterized in that to be able to monitor the synchronization signal along with the video.