JPH0522660A - Video signal generation device - Google Patents

Abstract

PURPOSE:To provide the digital video signal generation device capable of easily inserting an arbitrary picture into the specific horizontal line of an original picture. CONSTITUTION:The video signal generation device is provided with a horizontal direction memory 1 storing the digital data of the original picture and the insertion picture in one horizontal line and a vertical direction memory 3 storing the vertical direction control data reading out the original picture data for each line and a vertical direction control bit designating an insertion line. When it reads out the picture data from the horizontal direction memory 1 in the horizontal line unit, a data selector 5 supplies external vertical direction control data (a) to the horizontal direction memory in a line where a vertical direction control bit 12 directs the picture insertion, and the insertion picture data is read out. In the other line, the original picture is read out by supplying the vertical direction control data 11 of the vertical direction memory 3. The insertion picture can be changed only by changing the external vertical direction control data (a), and the contents of the vertical direction memory is not required to be changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal generator of a system for generating a video signal by digital processing.

[0002]

2. Description of the Related Art In recent years, video signal generators using digital signal processing have become popular.

FIG. 4 is a block diagram showing the structure of a conventional digital video signal generator. In the figure, 10 is a horizontal memory that holds digital data of an arbitrary original image in units of one horizontal line, 11 is a horizontal address counter for reading the memory, and 12 is a line of image data to be output from the memory. A vertical memory holding vertical control data for determining the cycle, 13 a vertical address counter for reading the vertical memory, 14 a D / A converter, 15 a low pass filter,
Reference numeral 16 is a buffer, and 17 is an output terminal.

The mutual relationship and operation of the above components will be described below. In the figure, the vertical direction control data stored in the vertical direction memory 12 is read by the vertical direction address counter 13 operating at the timing of the horizontal synchronizing frequency F _H , and the horizontal direction 1 stored in the horizontal direction memory 10 is read by the vertical direction control data. A plurality of original image digital data in units of lines are selected in a line cycle, the selected original image digital data is read by the horizontal address counter 11, digital / analog converted by the D / A converter 14, and the low-pass filter 15 and buffer are provided. A video signal output is obtained at the output terminal 17 through 16.

In such a video signal generator, the horizontal memory is provided with digital data of another specific image in addition to the digital data of the original image, and a specific line of the original image is read from the horizontal memory from the horizontal memory. If the vertical direction control data for outputting the digital data of the specific image is stored in the vertical direction memory, the specific image on the specific line of the original image can be inserted.

[0006]

In such a conventional video signal generating apparatus, when an arbitrary other image is to be inserted in a specific line of the original image, the vertical direction control data is associated with each image. It was necessary to prepare separately.

The present invention solves the above problems, and an object of the present invention is to provide a video signal generator capable of inserting an arbitrary image into a specific line of an original image without changing the vertical control data. ..

[0008]

In order to achieve the above-mentioned object, the present invention provides a first storage means for holding digital data of an original image and digital data of an arbitrary image, and of a video signal. 1 of the original image digital data to be read from the first storage means corresponding to a horizontal line
From the second storage means, there is provided second storage means for holding vertical control data for designating horizontal lines and vertical control bits for designating whether or not the arbitrary image is inserted in the horizontal lines. A selection means for inputting the vertical direction control data to be read and the vertical direction control data given from the outside, switching it by the control bit and inputting it to the first storage means, and in the video signal generating operation,
The vertical direction control data and the vertical direction control bit are read from the second storage unit, and the vertical direction control data read by the selection unit is set to the first in the horizontal line where the control bit does not specify the insertion of an image. The original image digital data is read out by giving it to the storing means, and the control data given from the outside is given to the first storing means in the specific horizontal line where the vertical direction control bit specifies the insertion of the image, and A video signal generating device is arranged so that the arbitrary image is inserted in horizontal line units into the specific horizontal line of the original image by reading digital data of the arbitrary image.

[0009]

According to the present invention, in the above structure, when the vertical control bit output from the second storage means does not specify the insertion of an image in the horizontal line, the vertical control data output from the second storage means is used. When the digital data of the original image is selected from the first storage means and the vertical direction control bit designates the insertion of the image on the horizontal line, the original direction image data is stored from the first storage means by the vertical direction control data given from the outside. The digital data of another arbitrary image is selected and read. Without changing the vertical control data of the second storage means, another image can be inserted into the original image in units of horizontal lines under the control of externally applied vertical control data.

[0010]

(Embodiment 1) A video signal generator according to 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 a video signal generator according to an embodiment of the present invention. In the figure, 1 is a horizontal memory which holds digital data of an original image and digital data of an arbitrary image other than the original image in units of one horizontal line, and 2 is a horizontal memory for reading out the horizontal memory. A directional address counter 3 is vertical control data for designating one horizontal line of the original image digital data to be read from the horizontal memory, and a vertical designating whether or not the arbitrary image is inserted in the horizontal line. A vertical memory having a direction control bit, and in this embodiment, the bit is inverted at the horizontal line to be inserted. Reference numeral 4 is a vertical address counter for reading the vertical memory, and 5 is the horizontal control by selecting either vertical control data output from the vertical memory or vertical control data a given from the outside by a vertical control bit. A data selector supplied to the directional memory 1, 6 is a D / A converter, 7 is a low-pass filter, 8 is a buffer, and 9 is an output end.

The mutual relationship and operation of the above components will be described below. As shown in FIG. 2, the horizontal memory 1 stores a plurality of sets 0, 1, ... Of original image digital data in units of horizontal 1 line and image digital data a in units of horizontal 1 line of other images. It is stored. If the number of digital data forming one horizontal line is N, the vertical direction control data is designated by the horizontal direction address counter 2 which operates at a frequency N times the horizontal synchronizing frequency F _H.
Data for horizontal lines is sequentially read, and digital data for one horizontal line designated by the vertical direction control data is sequentially read for each horizontal line to form one image. At this time, whether the image digital data read out from the horizontal memory is the original image or the arbitrary image is specified by the vertical control data output from the data selector 5.

The vertical control data according to the present invention will be described below with reference to FIG. 3A shows the structure of the control data in the vertical memory 3, and FIG. 3B shows the screen displayed in that case by taking a color bar as an example. According to the present invention, the vertical direction memory 3 specifies vertical direction control data for specifying digital data of an original image to be read corresponding to a horizontal line of a video signal, and a vertical direction for specifying whether or not to insert an arbitrary image on the horizontal line. And a direction control bit. Figure 3 (A)
In the vertical direction control, the lower n bits of the data sequence corresponding to one horizontal line determine which of a plurality of sets of original image digital data in the horizontal direction memory 1 held by the horizontal direction memory 1 is selected in the line cycle. It is data, and the most significant bit is a vertical direction control bit which becomes high only in correspondence with a horizontal line into which an arbitrary image is inserted. In this embodiment, since the original image is a color bar and the same original image digital data is selected for each horizontal line, the n-bit vertical direction control data are all the same.
Has become. Note that the other bits are not related to the present invention, and the description thereof will be omitted. When the above-mentioned data shown in FIG. 3A is read from the vertical memory 3 by the vertical address counter 4 operating at the horizontal synchronizing frequency F _H , the vertical control data composed of the lower n bits of the data is once data. It is applied to one input terminal A of the selector 5. On the other hand, the other input terminal B of the data selector 5 is supplied with vertical control data a for reading digital data of an arbitrary image to be inserted in a line from the horizontal memory. This control data is vertical control data given from the outside to select an image to be inserted. Further, the most significant bit of the data output from the vertical memory 3, that is, the vertical control bit is input to the input terminal S of the data selector 5. At this time, when the bit of the vertical control bit is low, the data selector 5 supplies the vertical control data for reading the digital data of the original image to the horizontal memory 1, and when the control bit is high. Supplies external vertical control data a for reading digital data of an arbitrary image to be inserted to the horizontal memory 1.

Therefore, the horizontal memory 1 outputs the original image data selected by the vertical control data when the vertical control bit is low, and is selected by the external vertical control data a when the vertical control bit is high. As shown in FIG. 3B, the arbitrary image data is output, and the vertical control bit is high in the original image of the color bar formed by the vertical control data read from the vertical memory. It is possible to obtain from the output terminal 9 a video signal in which another image designated by the external vertical direction control data is inserted in the horizontal line corresponding to the period.

Data stored in the vertical memory 3 is stored in the horizontal memory 1 by storing digital data of a plurality of sets of inserted images and switching the external vertical control data a for insertion in accordance with the inserted image. The image can be switched and inserted in various ways on a specific horizontal line of the original image without changing.

As described above, according to the video signal generator of the embodiment of the present invention, the vertical direction control data for designating the horizontal line for reading the digital data of the original image and the control bit for designating the horizontal line for inserting the arbitrary image. Is stored in the vertical direction memory, the external control data is selected by the control bit read from the vertical direction memory, and the horizontal direction memory is read out, so that the horizontal line specified by the external control data is set in the horizontal line specified by the control bit. Any image in the directional memory can be inserted.

In the embodiment, the vertical control bit is set to 1
Although it is composed of bits, it goes without saying that it may be composed of two or more bits.

[0017]

As apparent from the above embodiments, the present invention corresponds to the first storage means for holding the digital data of the original image and the digital data of the arbitrary image, and the horizontal line of the video signal. Vertical direction control data for designating one horizontal line of the original image digital data to be read from the first storage means, and a vertical direction control bit for designating whether or not the arbitrary image is inserted in the horizontal line. The second storage means held therein, the vertical direction control data read from the second storage means, and the vertical direction control data given from the outside are input, switched by the control bit, and input to the first storage means. And selecting the vertical control data and the vertical control bit from the second storage in the video signal generating operation, In the horizontal line where the control bit does not specify the insertion of the image, the selection means gives the read vertical direction control data to the first storage means to read the original image digital data, and the vertical direction control bit specifies the insertion of the image. In the specific horizontal line, the control data given from the outside is given to the first storage means to read the digital data of the arbitrary image therein, so that the arbitrary image is added to the specific horizontal line of the original image. By setting the video signal generator so that it is inserted in units of horizontal lines, an arbitrary image in the horizontal memory is inserted in the horizontal line specified by the vertical control bits, without changing the value of the vertical control data. Various images can be inserted into a specific line of the original image only by changing the fixed control data.

Since switching between the two types of vertical control data is performed by the vertical control bit in the data output from the vertical memory, it is not necessary to additionally provide a circuit for generating the switching signal. .. further,
By masking the vertical direction control bits with a gate, etc., the inserted image can be turned on / off, and by changing only the vertical direction control bits by software processing, the line for inserting the inserted image can be easily changed. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a video signal generator according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a horizontal memory in a video signal generator according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing a configuration of a vertical memory in a video signal generator according to an embodiment of the present invention and a corresponding screen display.

FIG. 4 is a block diagram showing a configuration of a conventional video signal generator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 horizontal direction memory (1st storage means) 3 vertical direction memory (2nd storage means) 5 data selector (selection means) 10 vertical direction control data 11 vertical direction control data read from the vertical direction memory 12 vertical direction control bit 13 Digital image data a Vertical control data given from outside

Claims (1)

Claim: What is claimed is: 1. A first storage means for holding digital data of an original image and digital data of an arbitrary image, and the first storage means corresponding to a horizontal line of a video signal. Second storage means for holding vertical control data for designating one horizontal line of the original image digital data to be read and vertical control bits for designating whether or not to insert the arbitrary image in the horizontal line. And a selection means for inputting the vertical direction control data read from the second storage means and the vertical direction control data given from the outside, switching it by the control bit, and inputting it to the first storage means. In the video signal generating operation, the second
Of the vertical direction control data and the vertical direction control bit from the storage means, and in the horizontal line where the control bit does not specify image insertion, the selection means stores the read vertical direction control data in the first storage means. The original image digital data is given and read, and the control data given from the outside is given to the first storage means in the specific horizontal line where the vertical control bit specifies the insertion of the image, and the arbitrary image therein. A video signal generator for inserting the arbitrary image in horizontal line units into the specific horizontal line of the original image by reading the digital data.