JPH02312369A - Television receiver - Google Patents

Abstract

PURPOSE:To monitor all the signals relating to current reference television broadcast simultaneously by displaying a synchronizing signal, etc., relating to the current reference television broadcast on a blank part generated due to the difference of an aspect ratio when both high definition television broadcast and the reference television broadcast can be received. CONSTITUTION:The receiver is comprised of a switch 2, a time base compression circuit 4, a synchronizing separator circuit 5, an adder synthetic circuit 6, a horizontal synchronizing signal delay circuit 7, a vertical synchronizing signal delay circuit 8, a picture-in-picture circuit 9, an adder circuit 10, a central processing unit 11, a driver 12, and a picture tube 13. And the video signal of the reference television broadcast with the aspect ratio 4:3 is displayed by applying time compression on a television receiver with the aspect ratio 16:9, and also, the synchronizing signal of the video signal is delayed by a prescribed quantity, and its delayed output is displayed on an area other than a time- compressed output area i.e., the blank part. In such a way, it is possible to monitor all the video signals of the reference television broadcast and the signals such as the synchronizing signal relating to the reference television broad cast, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver capable of receiving broadcasts of both the current standard television system and high-definition television system.

[Summary of the invention]

This invention compresses and displays a standard television broadcast signal with an aspect ratio of 4:3 on a television receiver having an aspect ratio of 16:9, and also transmits a synchronization signal included in the standard television broadcast signal. By delaying a predetermined amount and projecting this delayed output in an area other than the time-compressed output area, the video signal in standard television broadcasting and related synchronization signals and burst signals,
VrTS signal (control signal between broadcasting stations), OCR
All signals such as the ghost canceller reference signal can be displayed and monitored on the CRT at the same time.

[Conventional technology]

In recent years, advanced communication systems have been developed with the development of an advanced information society, and the advancement of television broadcasting, especially in satellite communication systems, is progressing. One such example is high-definition television (HDTV) broadcasting, which can reproduce images of A high-definition television has an aspect ratio of 16:9 and a horizontal scanning number of 1125 lines. On the other hand, in the current 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 broadcasts, development of television receivers that can receive both current standard television broadcasts and high-definition television broadcasts is underway.

However, in television receivers that can receive both high-definition television broadcasting and current standard television broadcasting, the aspect ratio of the high-definition television screen is 16:
9, whereas the aspect ratio of current NTSC television screens is 4:3, so when an NTSC screen is displayed on a high-definition television screen, a blank space appears on the screen.

Therefore, in the past, this margin was used to display on-screen signals, single-character multiplex signals, picture-in-picture signals, etc. (Japanese Unexamined Patent Publication No. 61-214872), Colors or sub-signal images such as analog clocks were displayed (Japanese Patent Laid-Open No. 6
1-224786).

Furthermore, in the past, this blank space was used to switch and display horizontal synchronization signals, vertical synchronization signals, etc. related to the NTSC screen.

In other words, if you want to monitor the horizontal sync signal, you can switch the delay circuit that delays the horizontal sync signal, or if you want to monitor the vertical sync signal, you can switch the delay circuit that delays the vertical sync signal, or you can use both the horizontal and vertical sync signals at the same time. When monitoring, switch the circuit that adds the horizontal and vertical synchronizing signals to obtain a so-called pulse cross, and when monitoring all video signals, reduce the amplitude of the horizontal and vertical synchronizing signals so that all screens are 4:3. I had switched to so-called underscan mode, which allows viewing at a higher aspect ratio.

[Problem to be solved by the invention]

However, in the case of the conventional method of switching and displaying synchronization signals, etc. as described above, it is necessary to change the switch for each mode.
There were drawbacks such as the inability to monitor all signals simultaneously on a CRT.

This invention was made in view of this point, and in a television receiver capable of receiving both high-definition television broadcasting and current standard television broadcasting, the current 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 to solve the problem]

A television receiver according to the present invention includes a time compression means (4) for displaying a standard television broadcast signal having an aspect ratio of 4:3 on a television receiver having an aspect ratio of 16:9; Delay means (5, 7, 8
, 10) and the output from this delay means to a time compression means (
4) compositing means (9, 11, 6) for projecting the image in an area other than the output area from the output area.

[Effect]

In the time compression means (4), the time in the horizontal direction of the video signal related to the standard television broadcast is used to display the standard television broadcast with an aspect ratio of 4:3 on a television receiver having an aspect ratio of 16:9. Compress the shaft.

Further, the synchronization signal is separated from the video signal related to standard television broadcasting (5) and delayed by a predetermined amount (7, 8) to obtain delayed horizontal synchronization signals and vertical synchronization signals. Furthermore, the delayed horizontal synchronization signal and vertical synchronization signal are added (10) to obtain a pulse cross signal, which is stored in the picture-in-picture circuit (9). These stored signals are read out based on the address signal from the central processing circuit (11), and added and synthesized with the previous time-axis compressed video signal in the addition/synthesis circuit (6). And the time axis compressed video signal is 4:
The image is displayed on a screen with an aspect ratio of 16:9 with an aspect ratio of 16:9, and a synchronization signal and the like are displayed on the remaining blank space. This allows all signals related to standard television broadcasting, such as video signals and synchronization signals, to be simultaneously displayed on the CRT and monitored.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 and 2.

FIG. 1 shows the circuit configuration of this embodiment. In the figure, (1) is an input terminal, and this input terminal (1) has an aspect ratio of 16:9. A high-definition television signal VHD having 1125 horizontal scanning lines is supplied.

High-definition television signal VH from this input terminal (2)
, is supplied to the contact a side of the switch (2).

(3) is an input terminal, and this input terminal (3) has an aspect ratio of 4:3. Standard television signal with 525 horizontal scanning lines ■8. (For example, a demodulated signal of the NTSC system) is supplied. The standard television signal VNA from this input terminal (3) is supplied to a time base compression circuit (4) and also to a synchronization separation circuit (5).

The time axis compression circuit (4) compresses the horizontal time axis of the standard television signal (1) from the input terminal (3), and supplies the compressed signal to the addition and synthesis circuit (6). A synchronization separation circuit (5) separates a horizontal synchronization signal and a vertical synchronization signal from the standard television signal Vst from the input terminal (3), and the horizontal synchronization signal is supplied to a horizontal synchronization signal delay circuit (7), where 1 /2
The vertical synchronization signal is delayed by a vertical synchronization signal delay circuit (8
), where it is delayed by 1/2■.

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

The horizontal synchronization signal, vertical signal, and these added signals stored in the PIF circuit (9) are processed by the central processing unit (CPU) (1
The signals are sequentially read out according to the address signals from 1) and supplied to the addition and synthesis circuit (6), where they are added and synthesized with the standard television signal 8A from the time axis compression circuit (4).

When receiving high-definition television, the switch (2) is switched to the contact a side, and a high-definition television signal (■) is received from the input terminal (1). is supplied to a picture tube (13) with an aspect ratio of 16:9 via a switch (2) and a driver (12). The picture tube (13) receives a high-quality television signal ■ from the input terminal (1). screen will be displayed.

Since the aspect ratio of the picture tube (13) is 16:9,
When receiving high-definition television, the high-definition television screen is displayed on the entire screen of the picture tube (I3).

When receiving a standard television image, the switch (2) is switched to the contact 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 video signal is displayed on the screen of the picture tube (13) with an aspect ratio of 4:3, as shown in Figure 2.
is displayed on the screen (14) as a vertical synchronizing signal, V
ITS signals, GCR signals, etc. are projected on the margin (15), horizontal synchronization signals, burst signals, etc. are projected on the margin (IG), and a signal obtained by adding the horizontal synchronization signal and vertical synchronization signal is projected on the margin (15). 17).

In this manner, in this embodiment, when receiving standard television, all signals related to the standard television signal, such as video signals and synchronization signals, can be displayed and monitored simultaneously on the screen of the picture tube (13). Note that the human signal source may be a directly received broadcast signal, or a signal from a camera or VTR.

In addition, in the above-mentioned embodiment, by adopting a configuration in which some parts are switched (not shown), the above-mentioned Japanese Patent Application No. 61-2148
As with Publication No. 72 and Japanese Patent Application No. 61-224786, it goes without saying that images of other channels can also be displayed. When the sync signal display mode is selected, the sync signal and the like according to the present invention are displayed in the blank space as described above.

〔Effect of the invention〕

As described above, according to the present invention, a standard television broadcast video signal with an aspect ratio of 4:3 is displayed on a television receiver having an aspect ratio of 16:9 in a time-compressed manner, and its synchronization signal is also transmitted. Since the delayed output is delayed by a fixed amount and displayed in an area other than the time-compressed output area, that is, in the margin area, a television receiver capable of receiving both high-definition television broadcasting and standard television broadcasting can All signals such as video signals and related synchronization signals in standard television broadcasting can be displayed and monitored simultaneously on a CRT, especially for broadcasting station monitor televisions and VT.
This is useful when applied to R playback signal monitor televisions, etc.

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 base 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)

[Scope of Claims] Time compression means for displaying a standard television broadcast signal with an aspect ratio of 4:3 on a television receiver having an aspect ratio of 16:9; A television comprising: delay means for delaying a synchronization signal by a predetermined amount; and composition means for projecting the output from the delay means in an area other than the output area from the time compression means. receiver.