JPH08146930A - Character superimposing circuit for word processor - Google Patents

Abstract

PURPOSE: To generate and output an S video output signal by superimposing a primary color signal of characters on a primary color signal based upon an S video input signal. CONSTITUTION: This circuit consists of a Y/C separation part 1 which separates a composite video signal into a color signal (C) and a luminance signal (Y), an input switching part 2 which selects and switches the S signal supplied from the Y/C separation part 1 and an externally inputted S signal, a decoding part 3 which generates the primary color signal (RGB) from the S signal outputted from the Y/C separation part 1, a character superimposing part 4 which superimposes the RGB supplied from the character generation part 6 on the RGB supplied from the decoding part 3, a synchronism detection part 5 which detects a synchronizing signal from the output Y signal, a character signal generation part 6 which generates various characters in phase with the inputted video signal on the basis of the detection result of the synchronism detection part 5, an NTSC encoding part 7 which converts the character-superimposed video signal supplied from the character superimposing part 4 into a composite signal of the NTSC system, and an S signal encoding part 8 which converts the character-superimposed video signal into the S signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a word processor character superimposing circuit for taking in a video signal and superimposing characters and symbols.

[0002]

2. Description of the Related Art A conventional word processor outputs a created sentence on a screen, paper, or the like. Further, as shown in FIG. 3, in addition to the basic functions, in a special multi-function word processor, for example,
Some have a function of capturing a video signal such as that captured by a video camera and superimposing a title created by a word processor, a simple sentence, or the like on the head portion and the like and outputting the superimposed signal.

FIG. 2 is a block diagram of an embodiment of a conventional word processing character superimposing circuit. Reference numeral 1 is a Y / C separation unit that takes in a composite video signal and separates it into a color signal (C) and a luminance signal (Y). A decoding unit 3 generates a primary color signal (RGB) from the Y signal and the C signal output from the Y / C separation unit 1. Reference numeral 5 denotes a sync detector that detects a horizontal sync signal and a vertical sync signal from the output Y signal.
Reference numeral 6 is a character signal generator that generates various characters in phase synchronization with the video signal input based on the detection result of the synchronization detector 5. 4 is the R supplied by the decoding unit 3.
It is a character superimposing unit that superimposes RGB supplied by the character generating unit 6 on GB. Reference numeral 7 is an encoding unit that converts a video signal on which characters are superimposed into a composite (composite video) signal or the like.

By the way, in the conventional word processor character superimposing circuit having the above-mentioned structure, only the video signal in the form of the composite signal is used as the input signal, and the generated signal in which the characters / symbols are superposed is converted into the composite signal or the like. Since the data is output, for example, the title can be easily written in the image taken by the video camera. Further, it is possible to easily add a commentary text of an image to a caption on the lower part of the screen or the like.

However, it is not possible to input the S signal as it is to a high quality camera having an S signal output. Further, the S signal cannot be supplied as it is to the high-definition television having the S signal input. There is a problem in that neither input device nor output device is compatible with high image quality (S signal).

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a word processor character superimposing device capable of superimposing a clear character on a high quality image and supplying the same character superimposing video signal with a high image quality. The purpose is to provide a circuit.

[0007]

In order to achieve the above object, by superimposing an internally generated character / symbol on an externally input video signal, a video signal superposed with the character / symbol is generated and output. In a character processing device for a word processor, a Y / C separation unit that separates an input composite signal into a Y signal and a C signal, and a Y supplied by the Y / C separation unit
An input switching unit that selects and switches between the signal and the C signal and the input S signal, a decoding unit that converts the Y signal and the C signal into primary color signals, and a synchronization signal is detected from the Y signal supplied by the input switching unit. A synchronization detection unit, a character signal generation unit that generates a required character / symbol signal based on the detection result of the synchronization detection unit, and a primary color signal output by the decoding unit, and a primary color signal output by the character signal generation unit. The character superimposing unit is configured to superimpose, the character superimposing video signal supplied by the character superimposing unit is converted into a composite signal, and the character superimposing video signal is converted into an S signal encoding unit.

[0008]

With the above-mentioned structure, the input switching unit is configured to select one of the Y signal and the C signal supplied from the Y / C separation unit, which is the video signal input, and the other S signal input, which is the video signal input. One of them is selected and supplied to the decoding unit. The decoding unit generates a primary color signal from the Y signal and the C signal. The character signal generator outputs a character signal synchronized with the Y signal as a primary color signal, the character superimposing section superimposes the primary color signal of the character signal on the primary color signal of the video signal, and the encoding section superimposes the primary color signal of the character signal on the primary color signal. To generate a composite signal. The S signal encoding unit also generates an S signal from the primary color signal on which the character signal is superimposed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The word processor character superimposing circuit according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a character superimposing circuit of a word processor according to the present invention. However, the same parts as those in the conventional example are denoted by the same reference numerals, and the description thereof will be omitted. Reference numeral 2 selects and switches the Y signal and the C signal supplied by the Y / C separation unit 1 for separating the input composite signal into the Y signal and the C signal and the S signal input from the outside, for example, an analog switch or the like. Is an input switching unit. A character-superimposed video signal 7 supplied from the character superimposing unit 4 is, for example, an NTSC (National Television System).
Committee) N to convert to composite signal
It is a TSC encoding unit. Reference numeral 8 is an S signal encoding unit that converts the character superimposed video signal into an S signal.

The operation of the word superimposing circuit of the word processor according to the present invention will be described with reference to FIG. The input switching unit 2 is one of the Y signal and the C signal, which is one video signal input and is generated and supplied from the composite video signal by the Y / C separation unit 1, and the S signal input, which is the other video signal input. Is selected and supplied to the decoding unit 3. The decoding unit 3 generates a primary color signal from the Y signal and the C signal. The character signal generator 6 outputs a character signal synchronized with the Y signal as a primary color signal, the character superimposing unit 4 superimposes the primary color signal of the character signal on the primary color signal of the video signal, and the NTSC encoding unit 7 outputs the character signal. A composite signal is generated from the superimposed primary color signals. Also,
The S signal encoding unit 8 generates an S signal from the primary color signal on which the character signal is superimposed. In addition, the Y / C separation unit 1 is, for example,
Even if it is composed of a frequency filter composed of a circuit such as LC or a comb filter composed of a 1H delay circuit such as a glass delay line or a line memory and an addition circuit, a two-dimensional line comb filter and a three-dimensional A frame-combination filter and a motion adaptive Y / C separation circuit may be used. Also,
The character superimposing unit 4 is configured by, for example, a high-speed changeover switch provided for each primary color signal RGB, and the high-speed changeover switch is switched by the primary color signal of the character signal to output a predetermined voltage supplied to another input. You can

[0011]

As described above, the present invention provides a word superimposing circuit for superimposing a clear character on a high quality image and supplying the same character superimposing video signal with a high image quality. Therefore, not only video cameras that handle composite signals, but also high-quality images such as SVHS video cameras that output S signal video signals and high 8 video cameras, superimpose titles and simple sentences created in word processors. Output as an S signal or a composite signal. There is a merit that it can support a wide range from high image quality to normal image quality.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a character superimposing circuit of a word processor according to the present invention.

FIG. 2 is a block diagram of an embodiment of a conventional word processing character superimposing circuit.

FIG. 3 is an explanatory diagram of a superimpose screen obtained as a result of superimposing characters by a character superimposing circuit of a word processor.

[Explanation of symbols]

 1 Y / C separation unit 2 Input switching unit 3 Decoding unit 4 Character superposition unit 5 Sync detection unit 6 Character signal generation unit 7 NTSC encoding unit 8 S signal encoding unit 17 Encoding unit

Claims (7)

[Claims] 1. A composite signal input in a character superimposing circuit of a word processor for generating and outputting a video signal in which characters / symbols are superimposed by superimposing characters / symbols generated inside in an externally input video signal. And a Y / C separation unit that separates the Y signal and the C signal, an input switching unit that selectively switches the Y signal and the C signal supplied by the Y / C separation unit, and the input S signal, and the Y signal and the C signal. A decoding unit for converting the signal into a primary color signal, a synchronization detection unit for detecting a synchronization signal from the Y signal supplied by the input switching unit, and a character for generating a required character / symbol signal based on the detection result of the synchronization detection unit. The signal generating unit, the character superimposing unit for superimposing the primary color signal output by the character signal generating unit on the primary color signal output by the decoding unit, and the character superimposing video signal supplied by the character superimposing unit are compo Tsu and encoding unit for converting the preparative signal, the character superimposing a video signal of a word processor consisting of the S signal encoding unit for converting the S signal character superposition circuit. 2. The character superimposing circuit for a word processor according to claim 1, wherein the Y / C separator is composed of a frequency filter. 3. The character superimposing circuit for a word processor according to claim 1, wherein the Y / C separator is formed of a comb filter. 4. The word processor according to claim 1, wherein the Y / C separation unit is composed of a motion adaptive Y / C separation circuit consisting of a two-dimensional line comb filter and a three-dimensional frame comb filter. Character superposition circuit. 5. The word superimposing circuit for a word processor according to claim 1, wherein the input switching unit is composed of an analog switch. 6. The character superimposing circuit for a word processor according to claim 1, wherein the character superimposing section is composed of a switch provided for each primary color signal. 7. The character superimposing circuit for a word processor according to claim 1, wherein the encoding unit is composed of an encoder for generating an NTSC composite signal.