JPH02237283A - Television receiver - Google Patents

Abstract

PURPOSE:To eliminate picture quality disturbance due to significance information to be superimposed by replacing the signal of an area of upper and lower parts of a picture with a specific picture signal in the case of receiving the signal of a television system with a wide aspect ratio. CONSTITUTION:A synchronization detection circuit 4 detects a horizontal synchronizing signal HD and a vertical synchronizing signal VD and a masking signal generating circuit 5 generates a masking signal MF representing the area of a picture signal replaced by a specific signal corresponding to the upper and lower part of the picture based on the signals HD and VD. A discriminator circuit 6 discriminates the signal system to generate a discrimination signal MODE. A selection circuit 3 selects specific signals R', G', B generated by a specific signal generating circuit 2 for a period of the masking signal MF when the MODE signal is the signal of the television system with a wide aspect radio and selects R, G, B signals demodulated at a demodulation circuit 1 at the outside of the period of the signal MF. When the MODE signal is accordance with the existing television system, the demodulated R, G, B signals are selected. Thus, the reproduced picture with less deterioration in picture quality is attained to any system of signals.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver, and is suitable for receiving current television signals as well as wide aspect ratio 1-ratio television signals that are compatible with current television. The present invention relates to a suitable television receiver.

[Conventional technology]

Recently, in the field of television, the aspect ratio (4.:3) of the current system has been made even wider, for example, 16.
The provision of realistic image services using 1:9 wide aspect ratio television signals is being considered.

Regarding the transmission of wide aspect ratio television signals, it is necessary to maintain compatibility with conventional, current television systems, and various systems have been devised to achieve this.

One example of a compatible wide aspect ratio television signal structure is the so-called upper and lower mask method.

In this system, for example, a television signal with a wide asbestos ratio of 1 is constructed as shown in FIG. 2(a). In the current television receiver with an aspect ratio of 1 to 1, a wide aspect ratio television image as shown in FIG. Due to the significant information transmitted at the same time, the image is received as a high-definition wide aspect ratio television image, as shown in FIG.

Note that when a television receiver with a current aspect ratio receives this wide aspect television signal, the significant information IN shown in the figure is also displayed at the same time, so the hatched area in Figure (b) In this case, image quality disturbance occurs due to this.

[Invention or problem to be solved]

In the case of a television with a wide-to-aspect ratio that has compatibility as described above, the level of significant information to be superimposed, etc.
Although attempts have been made to reduce image quality disturbances in television receivers with current aspect ratios by reducing the JX ratio, it is theoretically impossible to eliminate these image quality disturbances, and this poses a problem.

An object of the present invention is to provide a television image that does not interfere with the image quality even when receiving a compatible television signal with an aspect ratio of 1 to 1 through signal processing in a current aspect ratio television receiver. The objective is to provide a television receiver that can receive the following information.

[Means to solve the problem]

In order to achieve the above purpose, we have added a function to identify the television signals of the current television system and the compatible wide aspect (; When a signal is received, signal processing is performed to replace the signal in the lower area of the image marked by the hatched part in Figure 2(b), on which the information is superimposed, with a specific image signal. By performing and displaying the image 7c (from which interference has been removed), the image 7c is caused by the superimposed powerful information.

[Effect]

In the present invention, when a signal of the current television system is received, it is displayed as is as shown in FIG. 1(a).

On the other hand, when receiving compatible wide aspect ratio television signals, the dots at the top and bottom of the image on which significant information is superimposed, as shown in Figure 1(b). For the area 1, a masking process is performed to replace a specific image signal, for example, a signal corresponding to black or gray, and the image is displayed. This masking process removes image quality interference caused by significant information, so that a wide aspect ratio 1-to-1 television image can be displayed without image quality interference.

Note that the wide aspect ratio television system and the current system can be distinguished by, for example, detecting the presence or absence of an identification signal added to the television signal of the wide aspect ratio television system.

〔Example〕

Hereinafter, a practical example of the present invention will be explained with reference to FIG. In this embodiment, the input signal is a baseband television signal. Note that since signal conversion from radiation waves (RF band) to Haasband can be realized with a configuration similar to that of a conventional television receiver, these functions are omitted in the embodiment.

The demodulation circuit 1 demodulates the signal into three primary color signals R, a, and B by a predetermined demodulation operation according to the current television system. These functions can be realized in the same way as a conventional television receiver, so the details will be omitted.

On the other hand, in the specific signal generation circuit 2, for example, three primary colors R', G corresponding to a specific signal to be replaced when a compatible wide aspect ratio 1 to 1 television signal is received.
', B' signals are generated.

Further, in the synchronization detection circuit 4, the water Xfl synchronization signal H T:
), the vertical synchronization signal VD is detected, and based on this, the masking signal generation circuit 5 selects an area of the image signal to be replaced with a specific signal corresponding to the dot area as shown in FIG. 1(b). First, a masking signal M1.'' is generated.

Further, in the identification circuit 6, by detecting an identification signal, for example, it is determined whether the received signal is a signal of the current television system or a signal of a compatible wide aspect ratio television system. MODE
occurs.

The selection circuit 3 selects specific signals R', G' within the period of the masking signal MF when the MODE signal is compatible with a wide aspect I/ratio television system.
, B', and demodulated R, G, B' are selected outside the MF period.
Select a signal. In addition, if the old) l) E signal is of the current television system, the selection circuit 3 demodulates the demodulated R, G
, B signal is selected.

The output signals of these selection circuits 3 are subjected to a display operation by a display circuit 7 to reproduce an image.

Due to the following two operating functions, the current television format signal can be handled as shown in Figure 1 (a), and the compatible wide aspect ratio television signal as shown in Figure 1 (b). By performing image reproduction, it becomes possible to obtain a reproduced image with little deterioration in image quality for any signal of any system.

Note that, as described in this embodiment, the process of masking by replacing a part of the image signal with a specific signal does not necessarily have to be limited to compatible wide aspect ratio television systems. , it is also possible to make it possible with the current television system depending on the viewer's preference. Further, the masking area does not necessarily have to be limited to the dot area shown in FIG. 1(a), and can be changed depending on the viewer's preference. Furthermore, the specific signal used for masking can also be selected according to the viewer's preference. An example of an actual journey to realize these is shown in Figure 4.

This configuration is almost the same as the embodiment shown in FIG.
, the functionality of the identification circuit 10 is improved.

The specific signal group generation circuit 8 generates R″G LL , corresponding to multiple types of specific signals according to the control 1 to roll signals.
Generates BM signal. Note that these are, for example, ROM
This can be easily achieved by using etc.

Further, the masking signal group generation circuit 9 generates signals with masking regions having various shapes, as shown in FIG. 5, for example. These signals can also be easily realized using ROM or the like.

Further, the identification circuit 10 generates a MODE' signal to control the masking process based on the compatible wide aspect ratio 1 and the television system and the control signal.

Note that the control signal controls the operation so that the viewer can select the format of his/her preference.

〔Effect of the invention〕

According to the present invention, with a simple configuration, it is possible to reproduce images without interference for both the current television system and compatible wide aspect ratio television systems, so that a single receiver can be used. Image services of either method can be received.

Furthermore, since masking processing can be performed according to the viewer's preference, it can be used in a more multifunctional form.

It is clear that the present invention can also be applied to a display type television receiver that displays images in a sequential scanning format using scanning line interpolation processing or the like.

Further, in the present invention, a case has been described in which masking processing is performed on a specific signal, but it is clear that this function can be realized by a mechanical adapter as shown in FIG.

[Brief explanation of drawings]

Fig. 1 shows one form of image display according to the present invention, Fig. 2 shows an example of a compatible form of a television system with a wide aspect ratio, and Figs. 3 and 4 show an example of the present invention. , FIG. 5 is a diagram showing one form of the masking area in the present invention, and FIG. 6 is a diagram showing one form when the function of the present invention is realized by a mechanical adapter. 1... Demodulation circuit, 2... Specific signal generation circuit, 3.
Selection circuit, 4... Synchronization detection circuit, 5... Masking signal generation circuit, 6... Identification circuit, 7... Table box circuit, 8
- Specific signal group generation circuit, 9... Masking signal group generation circuit, 10... Identification circuit. spelling

Claims (1)

[Claims] 1. Has a function to identify television signals of the current television system and a compatible wide aspect ratio television system, and in the case of a wide aspect ratio television signal that is compatible with the above, significant information What is claimed is: 1. A television receiver characterized in that a superimposed area of the image is replaced with a specific signal and displayed in a masked form.