JPH0955900A - Method and device for switching picture mode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unnecessary switching from the superimposed dialogue in-mode of the video picture by providing a sound mode detection means, which detects stereo broadcast or not, and a picture mode control means which inhibits the auto-wide function from switching the superimposed dialogue in-mode. SOLUTION: A picture mode control means 12 monitors whether a picture of the 4:3 aspect ratio is sent or not when a picture mode setting means is set to the state of the superimposed dialogue in-mode. While a picture of the normal size is not sent, the superimposed dialogue in-mode is held. If it is judged that a picture of the 4:3 aspect ratio is sent, the picture received at present is discriminated as commercial broadcasting when switching from multiplex broadcasting to stereo broadcasting is discriminated based on the discrimination result of a sound mode detection means 11. At this time, switching by the auto- wide function is inhibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen for controlling switching of screen modes according to respective aspect ratios when receiving a television signal including image screens having different aspect ratios in a television receiver. The present invention relates to a mode switching device.

[0002]

2. Description of the Related Art In recent years, wide screen television receivers have become widespread. This wide-screen television receiver receives a 4: 3 normal-size television signal called a so-called letterbox with a 16: 9 image in the center of the upper and lower parts of the screen masked by a black signal, and displays it. When the image is processed as, the part of the screen where the upper and lower parts of the screen are masked by the user's operation, such as the subtitle in mode or the wide zoom mode, is excluded from the screen and enlarged, and the image part is displayed on the entire 16: 9 screen. Project 1
It can be viewed as a 6: 9 image. Also, the image portion can be automatically displayed on the entire 16: 9 screen by enlarging as described above by the auto wide function without the user's operation. On the other hand, when a television signal of a normal size image of 4: 3 which is not a letter box broadcast is received, the image portion is displayed on the entire screen by the auto wide function in the wide mode enlarged to the left and right. In addition, the subtitle in mode described above leaves the subtitles on the lower side of the received letterbox broadcast and eliminates the black image part on the upper side,
This is a mode for enlarging the 16: 9 image inside. The wide zoom mode is a mode in which the upper and lower black image portions are excluded and the 16: 9 image inside is enlarged.
In addition to these two modes, as described above, a normal television signal of 4: 3 which is not letterbox broadcasting is set to 1 on the right and left.
There is a wide mode that expands to a screen of 6: 9.

FIG. 3 (a) is a block diagram showing a configuration of a conventional screen mode switching device for realizing such an auto wide function. In the figure, 1 is an aspect ratio of a video signal of a received television wave. Aspect ratio detecting means 2 for detecting the subtitles, 2 for detecting subtitles in the black portion of the letterbox signal from the video signal of the received television signal, and 3 for the aspect ratio of the video signal detected by the aspect ratio detecting means 1. Screen mode determination means 4 for determining a screen mode to be switched based on the presence or absence of the subtitle detected by the subtitle detection means 2 is a screen mode setting means for switching the image to the screen mode determined by the screen mode determination means 3.

In this conventional screen mode switching device, an example of how each of the above modes is selected when the auto wide function is set is shown as a flowchart in FIG. 3 (b). The input television signal is detected by the aspect ratio detecting means 1 as a 4: 3 ordinary television image or the letterbox image (step S).
1). In the case of a letterbox image, the presence or absence of a subtitle in the black image portion is further detected by the subtitle detection unit 2 (step S3). Next, by the screen mode determination means 3, 4: 3
The normal image, the letterbox image without subtitles, or the letterbox image with subtitles is judged. The screen mode setting means 4 is in wide mode for a normal image of 4: 3 (step S6), in wide zoom mode for a letterbox image without subtitles (step S4), and for letterbox image with subtitles. Sets the subtitle in mode (step S5).

[0005]

Since the conventional screen mode switching device is constructed in this way, when the auto wide function is selected and a movie or the like with subtitles is watched 4:
When the commercial broadcast having the aspect ratio of 3, the subtitle in mode is switched to the wide mode in which the image is spread laterally by the screen mode determination means 3, the commercial image is displayed on the entire screen, and the commercial broadcast is finished. If the subtitle is not displayed, the normal program content is displayed, and the subtitle is switched to the wide zoom mode.If the subtitle is displayed, the first subtitle in mode is switched to again. Had a problem that the image pattern on the screen suddenly changed, and in some cases the image pattern on the screen also changed, and the interest in watching TV was diminished.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a screen mode switching device capable of preventing unnecessary switching of the video screen from the subtitle in mode.

[0007]

A screen mode switching method according to the present invention is a wide mode for an ordinary TV signal having an aspect ratio of 4: 3, a wide zoom mode for a TV signal without a subtitle, and a letterbox with a subtitle. In a screen mode switching method for a horizontal TV receiver having at least a subtitle in mode for the TV signal and having an auto-wide function between the modes, a stereo mode broadcast in which the audio mode is at least based on the TV signal. When the auto wide function is selected as the subtitle in mode, the auto mode of the subtitle in mode is detected when the "stereo" broadcast is detected by the audio mode detecting unit. The feature is that switching by the wide function is prohibited.

The screen mode switching device according to the present invention is 4:
It has at least a wide mode for ordinary TV signals with an aspect ratio of 3, a wide zoom mode for letterbox TV signals without subtitles, and a subtitle in mode for letterbox TV signals with subtitles, and an auto-wide function between those modes. In a screen mode switching device for a horizontal television receiver including, when an audio mode detection means for detecting at least a "stereo" broadcast based on the television signal, and an auto wide function is selected in the subtitle in mode. When the "stereo" broadcast is detected by the audio mode detection means, screen mode control means for prohibiting switching by the auto wide function of the subtitle in mode is provided.

[0009]

In the screen mode switching method according to the present invention, when the aspect ratio detection means detects a change in the aspect ratio of an image from 16: 9 to 4: 3 when the subtitle in mode is selected, the next audio mode is selected. The detection means detects whether or not the "sound multiplex" broadcast is switched to the "stereo" broadcast, and if switched to the "stereo" broadcast, it is determined that the commercial broadcast is currently displayed on the screen, and the subtitle The automatic switching from one mode to another screen mode is prohibited, and the annoyance to the television viewer is reduced by the switching of the screen mode that is automatically performed every time the commercial broadcast flows. On the other hand, if the "voice multiplex" has not been switched to the "stereo" broadcast, it is determined that the broadcast is not a commercial broadcast but a normal 4: 3 television signal, and the wide mode is switched to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the screen mode switching device of this embodiment. In the figure, 10 is an aspect ratio detecting means for detecting a change in the image of the television signal between 16: 9 and 4: 3, and 11 is an audio mode detecting means for detecting an audio mode of "multiplex" broadcasting or "stereo" broadcasting. , 12 are aspect ratio detecting means 10 and voice mode detecting means 11
The screen mode control means for controlling the screen mode based on the result of the determination and the currently set screen mode, and 13 is the screen mode setting means for setting the screen mode based on the output of the screen mode control means 12.

FIG. 2 is a flow chart showing the processing operation of the screen mode control means 12 of the screen mode switching device of this embodiment. When the screen mode setting unit 13 is set to the subtitle in mode, the screen mode control unit 12 receives a video of a 4: 3 aspect ratio such as a commercial broadcast or a news information broadcast of a normal size. We are monitoring whether or not it has come (step S11, step S
12) If the normal size image is not sent, the subtitle in mode is held. On the other hand, step S1
When it is determined that the video of the aspect ratio of 4: 3 of the normal size has been sent in 2, the voice is further “multiplexed” based on the determination result of the voice mode detection means 11.
It is determined whether or not the broadcast has been switched to the "stereo" broadcast (step S13). When it is determined that the "multiplex" broadcast has been switched to the "stereo" broadcast, it is determined that the currently received image is a commercial broadcast (step S14). When it is determined that the currently received broadcast is a commercial broadcast, the subtitle in mode until then is held and fixed as it is. That is, switching by the auto wide function is prohibited.

When it is determined in step S13 that the "multiplex" broadcast has not been switched to the "stereo" broadcast, 4: 3 in the normal mode which is not the commercial broadcast.
Since the image is being received, the screen mode is switched to the wide mode (step S15).

As described above, in the screen mode switching device of this embodiment, even if the commercial broadcast is received while the subtitle in mode is set, the subtitle in mode set up to then can be switched. It keeps the subtitle in mode until then. In other words, as a result, the screen mode does not switch every time a commercial broadcast image is displayed while watching the video screen in the subtitle in mode, and the TV viewer does not have to bother with switching the screen mode. It will be released.

[0014]

According to the present invention, even when a commercial broadcast is received in the subtitle in mode, the screen mode remains the subtitle in mode.
There is an effect that it is possible to effectively prevent unnecessary switching from the subtitle in mode of the video screen by the commercial broadcast which is frequently inserted into the program video of No. 3.

[Brief description of drawings]

FIG. 1 is a block diagram showing a screen mode switching device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the screen mode switching device according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional screen mode switching device.

[Explanation of symbols]

 10 Aspect Ratio Detection Means 11 Audio Mode Detection Means 12 Screen Mode Control Means 13 Screen Mode Setting Means

Claims (2)

[Claims] 1. A wide mode for an ordinary television signal having an aspect ratio of 4: 3, a wide zoom mode for a letterbox television signal without subtitles, and a subtitle in mode for a letterbox television signal with subtitles, at least. In the screen mode switching method of the horizontal television receiver having the auto wide function between the modes, the audio mode detecting means for detecting whether or not the audio mode is at least "stereo" broadcasting based on the TV signal, When the wide function is selected in subtitle in mode,
A screen mode switching method, wherein switching of the subtitle in mode by the auto wide function is prohibited when "stereo" broadcasting is detected by the audio mode detection means. 2. A wide mode for an ordinary television signal having an aspect ratio of 4: 3, a wide zoom mode for a letterbox television signal without subtitles, and a subtitle in mode for a letterbox television signal with subtitles, at least. In the screen mode switching device of the horizontal television receiver having the auto wide function between the modes, the audio mode detection means for detecting at least "stereo" broadcasting based on the TV signal and the auto wide function for subtitle in When the mode is selected, the screen mode control means for prohibiting the switching of the subtitle in mode by the auto wide function when the "stereo" broadcast is detected by the audio mode detection means is provided. Screen mode switching device.