JPH0271685A - Video equipment - Google Patents

Abstract

PURPOSE:To prevent invasion of noise or stripe and to obtain a pattern easy to see by storing a video signal into a memory sequentially, outputting the last pattern of the memory as a still picture with mode changeover, releasing part or all of the picture thereafter and outputting a switched video signal. CONSTITUTION:A control circuit 3 at changeover of the video mode inhibits write of a memory 1. The picture information of a 1st mode written finally from the memory 1 is read repetitively and a still picture is outputted. The signal processing corresponding to a second mode is finished during the output of the still picture by a signal processing circuit 2. After a prescribed time, the write inhibit is released and the memory 1 writes and reads in parallel the output of the signal processing circuit 2 at any time. In this case, part or all of the still picture of the 1st mode is released by the processed signal corresponding to the end mode at the output of the processing circuit 2 and the video image of the 2nd mode is outputted. The mode is the TV multiple channel picture mode or the like and the processing circuit 2 is a multiplex channel picture generating circuit or the like.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to video equipment, and particularly to video equipment that outputs previous video content as a still image when switching between multiple video modes such as... Regarding equipment.

[Conventional technology]

Conventional video equipment, such as television receivers, when switching video modes, for example, when switching channels, displays noise or striped images on both sides even during the period when the channel is not tuned until the desired channel is tuned. It was displayed on. In addition, as described in Japanese Patent Application Laid-open No. 60-235592, when the channel is not matched during tuning in a television receiver equipped with an auto-tuning function, certain pre-stored image data is It was displayed as a still image, and when the tuning was correct, the received video was displayed.

[Problem that the invention seeks to solve]

In the conventional technology described above, when switching the video mode, unnecessary images such as noise, striped patterns, or specific images appear between the previously displayed image and the next image to be viewed. There was a problem that it was very difficult to see because it was visible.

SUMMARY OF THE INVENTION An object of the present invention is to provide video equipment that can continuously switch from a previously displayed video to a next video to be displayed when switching video modes.

[Means for solving problems]

The above purpose is to store video signals in memory sequentially, and when the video mode is switched, the last one stored in memory is
It repeatedly reads data for a screen and outputs it as a still image.
This is achieved by subsequently canceling part or all of the still image and outputting the switched video signal.

[Effect]

When operating in a certain video mode, video signals are stored in the memory at any time, and read out and output at any time. If the memory is switched to another video mode, the memory becomes write-inhibited and the same image data is read out repeatedly, so that the last video of the previous video mode is output as a still image. After that, when the time elapses, the write-protected state of the memory is canceled, and the input video signal of the next video mode is written to the memory, and then read out and output, so that the still image changes to the next video mode. The image changes to a stable image. Therefore, even if the video mode is switched, the video can be continuously switched without unnecessary video such as noise being displayed in the middle.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

1 is a memory, 2 is a signal processing circuit, 3 is a control circuit that controls the memory 1 and the signal processing circuit 2, and 4 is a video signal.

When operating in the first video mode, the control circuit 3 controls the signal processing port Nt2 to perform signal processing corresponding to the first video mode on the video signal 4 and output it. At the same time, the output of the signal processing circuit 2 is controlled to be written into the memory 1 as needed and read out in parallel. Therefore, in this case, a video corresponding to the first video mode is output.

When the first video mode is switched to the second video mode, the control circuit 3 controls the memory 1 to be in a write-inhibited state. Then, from memory 1,
Since the last written image data in the first video mode is read out repeatedly, the video just before the video mode is switched is finally output as a still image. At the same time, the control circuit 3 controls the signal processing circuit 2 to perform signal processing on the video signal 4 corresponding to the second video mode. Then, the signal processing circuit 2 completes the signal processing corresponding to the second video mode while the still image is being output.

After the control circuit 3 controls the memory 1 to be in a write-protected state, when a predetermined period of time has elapsed, the control circuit 3 controls a part or the whole of the memory 1 so that the write-protected state is released. . Then, the memory 1 again starts writing the output of the signal processing circuit 2 as needed and reading it in parallel. However, the output of the signal processing circuit 2 at this time is a stable signal that has already undergone signal processing corresponding to the second video mode, so the output video content is a still image of the last scene of the first video mode. is partially or completely canceled, and the video in the second video mode is output there.

Here, the video mode is, for example, a TV reception channel, a strobe image that divides a normal screen into multiple parts and continuously displays one video as shown in Figure 3, or a strobe image as shown in Figure 4. This applies to multi-channel images in which one normal screen is divided into several parts and each part displays the reception content of a different TV channel, and correspondingly, the signal processing circuit 2 has a channel selection circuit and a strobe image creation circuit for each part. ,
This applies to multichannel image creation circuits.

Therefore, what has been described above can be explained using a transition diagram of operating states as shown in FIG. 2. In FIG. 2, the moving image state refers to a state in which stable images such as received images of television channels, human video images, strobe images, and multi-channel images thereof are output. For example, if a channel is changed, the operating state changes from a moving image to a static screen, and the memory 1 in Figure 1 is set to write-protected state, and the last image of the video that was being output up to that point is output as a still image. do. Next, the operation state shifts to channel switching, and the signal processing circuit 2 shown in FIG. 1 selects a desired channel and outputs the video signal. Next, the screen returns to a static state, and this time the write protection of the memory 1 shown in FIG. 1 is canceled to release the screen from static. Next, the operation mode returns to the moving image state, and the video signal of the desired channel is written into the memory 1 shown in FIG. 1 and output. The channel switching operation is now complete. Additionally, when the video mode is switched to the strobe image mode, the operating state changes from a moving image to a static screen, and the memory 1 in Figure 1 is set to a write-protected state, and the last image of the video that was being output until then is transferred. output as a still image. Next, the system shifts to a strobe operation state, and the signal processing circuit 2 shown in FIG. 1 performs signal processing to divide the input image into screens and output them continuously. Next, the screen returns to a static state, and this time, the write-protected state of memory 1 in Figure 1 is partially released, or the whole part is released one by one, and the screen freeze is partially released, or the whole part is released one by one. 0 After canceling, the operation state returns to moving image, and a strobe image is output to the portion where the still image was canceled. With the above steps, switching to strobe image mode is completed. Switch to this strobe image mode!
The method of using memory 1 in Figure 1 in the 11j work is explained in Chapter 5.
This will be explained in detail using FIGS. FIG. 5 shows an example of how one screen is divided in the strobe image mode, and FIG. 6 is a memory map corresponding to each divided small screen in FIG. When the video mode is the video mode, writing and reading of input video data is performed in parallel using the entire memory area from A to E in the memory map in Figure 6, and one image is displayed on the entire screen. The video will be displayed. Therefore, when switching to the strobe image mode, the data for one screen of the previous moving image is written, and then the writing is prohibited. Then, only the reading is repeated while the video data of the last screen of the moving image remains written in the memory, so that the last scene of the moving image is displayed as a still image on the entire screen. Next, only the area A of the memory in FIG. The data is converted into individual pieces of data and written to area A of the memory. Therefore, the image for one screen is displayed as a small screen in the part A of the screen in FIG. 5, and the previous still image continues to be displayed in the other parts B to I. Next, the area A of the memory in FIG.
It is converted into individual pieces of data and written to area B of the memory. Therefore, two consecutive scenes are displayed as small screens in portions A and B of the screen in FIG. 5, and previous still images continue to be displayed in the remaining portions C to 4. By sequentially performing write protection/release of write protection on areas C and D, strobe images are displayed one after another, and if there is a part where no strobe image is displayed, the memory corresponding to that area is By leaving the area write-protected, you can keep the previous video as a still image. Furthermore, when switching to the multi-channel image mode, the operation state transition is the same as in the case of the strobe image mode, except that the processing content of the signal processing circuit 2 in FIG. 1 changes accordingly. According to this embodiment, when switching the TV reception channel, when the video content changes from the previous video content to the video content of the next desired channel, the video content is continuously displayed without outputting unnecessary video such as noise. It has a changing effect. In addition, when outputting strobe images or multi-channel images, by removing still images of the video content that was previously output one by one, areas where the strobe or multi-channel image split screen is not displayed can be removed. has the effect of preserving previous video content as a still image.

〔Effect of the invention〕

According to the present invention, when the video mode of the video equipment is switched, the previous output video is continuously switched to the output video of the next mode, and unnecessary video such as noise and stripes is inserted in the middle. Since it can prevent this, it is very effective in making it easier to have children.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a mode transition diagram showing the operation of the embodiment, and FIG. 3 is an explanatory diagram showing an example of a screen display state in strobe image mode.
FIG. 4 is an explanatory diagram showing an example of a screen display state in multi-channel image mode, FIG. 5 is an explanatory diagram showing an example of a screen division method, and FIG. 6 is an example of a memory map corresponding to the screen division shown in FIG. FIG. 1...Memory, 2...Signal processing circuit, 3...Control circuit, 4...Video signal. Akira/I2] Brother 3 Prisoner Akira 2nd No. 40

Claims (1)

[Scope of Claims] 1. A video device comprising a memory capable of writing and reading an input video signal, and a control means capable of controlling the writing/reading state of the memory according to the video mode. 1. A video device that outputs previous video content as a still image signal when the video is switched. 2. In a video display device having at least three display modes including a still image mode, when switching display modes, the display mode is switched from the display mode before switching to the display mode after switching via the still image mode. video display device. 3. A video device having a still image mode, which is characterized in that when switching television reception channels, the received video of the channel before switching is outputted via the still image mode to the received video of the channel after switching. 4. In video equipment that has a still image mode and a strobe image mode that divides one screen into multiple screens and continuously displays input video on at least one of each small screen, when switching to strobe image mode, A video device characterized by switching from a display mode to a strobe image mode via a still image mode, and leaving a still image in an area on the screen where a strobe image is not displayed. 5. In video equipment that has a still image mode and a multi-channel image mode that divides one screen into multiple parts and displays received images of multiple TV channels on at least one of each small screen, when switching to the multi-channel image mode. ,
Video equipment characterized by switching from a display mode before switching to a multi-channel image mode via a still image mode, and leaving a still image in an area on the screen where the multi-channel image is not displayed.