JPH03250872A - Superimposing device - Google Patents

Abstract

PURPOSE:To enter character data directly from a wordprocessor and to attain scroll display sequentially even for a title or an explanation sentence of a long sentence over several screens by superimposing characters onto a video image over several screens and scrolling the resulting image. CONSTITUTION:Since varies a character address for each vertical synchronization gradually with respect to the horizontal synchronization in the case of horizontal direction scroll and varies a character address for each vertical synchronization gradually with respect to the vertical synchronization in the case of vertical direction scroll, a character data generated from a character generator 24 addressed while timing is gradually deviated is superimposed on the video signal in a superimposing circuit 16. Thus, the character data superimposed on the video signal is displayed with scrolling in horizontal or vertical direction on a display screen. Thus, a character data is inputted directly from a wordprocessor 20 and the data is sequentially displayed with scrolling even in the case of a title or an explanation sentence of a long sentence over several screens.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a superimposing device, and more particularly to a superimposing device that superimposes text input from a word processor onto a video.

[Prior Art] In recent years, the popularity of video tape recorders has increased, and their uses have also expanded. Conventionally, teloppers have been used to add arbitrary titles to recorded video and edit it.

This involves preparing a title, converting it into a video signal using a camera, and compositing it with the original image.Recently, products have been commercialized that can also be used on personal computers. In addition, in Japanese Patent Application Laid-open No. 182879 (HO4N) published on September 18, 1985,
A camera has been proposed that can generate a text title on the camera body and superimpose it on the image. However, in all of these, the size of the title must be within one screen, and it is not possible to superimpose a long title or explanatory text that spans several screens.

On the other hand, the popularity of word processors has been increasing recently, but if you want to use a sentence created with this word processor as a title, you must first print it on paper with the word processor, and then use the word processor to print the printed letters or characters on a video. It is necessary to take a picture with a camera and combine the video signal with the original picture. This method is not only complicated in that it must be printed once, but also has the restriction that the size of the title must be within one screen, similar to the above-mentioned prior art.

Therefore, the main object of the present invention is to provide a superimposing device that can input character data directly from a word processor and that can sequentially scroll and display long titles and explanations that span several screens. be.

[Means for Solving the Problems] Simply put, the present invention is a superimposing device that displays characters generated from character data input from a word processor by superimposing them on a video signal. A memory for storing character data input from a character generator, a character generator that generates character data according to the character data, a synchronization separation circuit that separates a synchronization signal from a video signal, and a timing that gradually changes with respect to the synchronization signal. It is equipped with a control means that sends character data stored in memory to a character generator as a character address, and a superimpose circuit that superimposes character data from the character generator on a video signal, thereby superimposing characters on the video over several screens. This is a superimpose device that allows you to both impose and scroll display.

[Operation] When a group of character data is manually entered as a title from a word processor, it is stored in memory.

The character data stored in this memory is output as a character address of the character generator, and the timing thereof is controlled by the control means. For example, when scrolling in the horizontal direction, the control means gradually changes the character address with respect to the horizontal synchronization every vertical synchronization, and when scrolling in the vertical direction, the control means gradually changes the character address with respect to the horizontal synchronization every vertical synchronization. It changes gradually. The character data generated from the addressed character generator with the timing gradually shifted in this way is superimposed on the video signal in the superimpose circuit. Therefore, on the display screen, the character data superimposed on the video signal is scrolled in the horizontal or vertical direction.

〔Effect of the invention〕

According to this invention, since character data input from a word processor is stored in the memory,
Character data can be entered directly from the word processor even for long titles, and since a scrolling function is provided by the control means, even long titles and descriptions that span several screens can be displayed while being scrolled in sequence. can do.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[Example] FIG. 1 is a block diagram showing one embodiment of the present invention.

The superimposing device 10 of this embodiment includes an input terminal 12 to which an input video signal is applied.
The video signal applied to 2 is applied to a sync separation circuit 14 and a superimpose circuit 16. Synchronous separation circuit 1
4, the horizontal synchronization signal Hsync and the vertical synchronization signal Vsync are separated from the video signal and sent to the control circuit 18.
give to The synchronization separation circuit 14 further creates a reference clock and supplies it to the control circuit 18 in order to control the display position in the horizontal direction. As the second reference clock, a clock with a short enough period to control the display position in the horizontal direction using an integer multiple of the reference clock is used, such as 4fsc (a clock with a frequency four times that of the color subcarrier). be done.

On the other hand, the word processor 20 includes a keyboard (not shown), converts the data into necessary character data according to the key code input from the keyboard, and outputs the character data. The word processor 20 may be a dedicated word processor, or may be a personal computer having a word processor function. and,
Character data input from word processor 20 is stored in memory 22. The control circuit 18 is composed of, for example, a microcomputer or a microprocessor, and reads character data from the memory 22 and outputs it to the character generator 24.

The character generator 24 reads character data from the given character address and supplies it to the superimpose circuit 16.

Note that a display switch 26 and a direction changeover switch 28 are connected to the control circuit 18. The display switch 26 is operated in the superimpose circuit 16 when character data generated from the character generator 24 is to be superimposed, and the direction changeover switch 28 is operated.
is a switch for selecting horizontal scroll display or vertical scroll display.

In the embodiment shown in FIG. 1, when a character data group is input as a title from the word processor 20, the character data group is stored in the memory 22. When the display switch 26 is operated, the control circuit 18 outputs character data read from the memory 22 as a character address to the character generator 24, but the timing thereof is gradually changed.

That is, when scrolling in the horizontal direction, the reference clock 4fsc is counted, and the timing at which a character address is outputted with respect to the horizontal synchronization signal Hsync is increased or decreased by several clocks of the reference clock every time the vertical synchronization signal Vs yH (. Similarly, when scrolling in the vertical direction, the control circuit 18 uses the horizontal synchronization signal Hsync.
is counted, and for each vertical synchronization signal Vsync,
Specifically, increasing or decreasing the timing of outputting a character address with respect to the vertical synchronization signal Vsync by several horizontal synchronizations is as shown in Figure 2.
...Congratulations. Assume that you want to superimpose a long explanation such as ". When horizontally scrolling one character per second to the left on the screen, assuming 30 frames per second, if the character that starts displaying at time T1 shown in Figure 2 (b) is "mu", two characters will be displayed. The time T2 shown in FIG. 2(C) when the robot moves is T1,022 seconds. Similarly, Fig. 2(d),... Fig. 2(y) and Fig. 2
Time T3 shown in figure (z). ...T4 and T5 are delayed by 2 seconds with respect to the horizontal synchronizing signal HsynC shown in FIG. 2(a). 60 frames are displayed in 2 seconds, and by scrolling in this manner, the character that starts displaying is shifted by 1/3o character per frame. Therefore, when controlled as shown in FIG. 2, a horizontal scrolling operation to the left as shown in FIG. 3 is achieved.

In addition, as shown in Figure 4, when vertically scrolling upward by 60 lines per second, if the number of frames per second is 30 and the number of lines per frame is 525, then the line to start displaying every frame is two lines at a time. If you reduce it, it will scroll vertically by two lines.

In this way, the character data output from the character generator 24 whose timing is controlled by the control circuit 18 is superimposed as a title on the video signal input from the input terminal 12 in the superimpose circuit 16, and is output. It is output to terminal 30.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a timing diagram showing how the timing of outputting a character address in response to a horizontal synchronization signal is gradually changed in order to cause horizontal scrolling. FIG. 3 is an illustrative view showing the state of scrolling by horizontal scrolling when controlled according to FIG. 2. FIG. 4 is an illustrative view showing the state of scrolling due to vertical scrolling operation. In the figure, 10 is a superimpose device, 14 is a synchronous separation circuit, 16 is a superimpose circuit, 18 is a control circuit, 20 is a word processor, 22 is a memory, 26 is a display switch, and 28 is a direction changeover switch.

Claims (1)

[Scope of Claims] A superimposing device for displaying characters generated by character data input from a word processor superimposed on a video signal, comprising: a superimposing device for storing character data input from the word processor; a memory, a character generator that generates character data according to character data, a synchronization separation circuit that separates a synchronization signal from the video signal, and the character data stored in the memory at a timing that is gradually changed with respect to the synchronization signal. and a superimpose circuit for superimposing character data from the character generator on the video signal, thereby superimposing characters on the video over several screens. A superimpose device that enables scrolling display.