JPS61189089A - Superimposing device - Google Patents

Abstract

PURPOSE:To insert and display one of two pictures comprised of two external input 3 primary color signals to the other by using a switching signal from the 1st video device so as to switch both the 3 primary color signals from the 1st and 2nd video devices. CONSTITUTION:The red/green/blue primary color signals with respect to picture information generated by the 1st and 2nd video device 13, 14 are fed to clamp circuits 16, 18, 20 and clamp circuits 17, 19, 21. The 1st video device 13 synthesizes the three primary color signals (c, d, e) and generates a Ys signal when the produced luminance signal has a prescribed level or over, and switching circuits 22, 23, 24 output selectively each output primary color signal of the clamp circuits 16, 18, 20 when the Ys signal (f) is at high level and each output primary color signal of the clamp circuits 17, 19, 21 when low level. The 1st picture by the video device 13 is inserted and displayed in the reproduced pattern of a television receiver 1 while the 2nd picture by the video equipment 14 is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a superimposing device, and in particular, it superimposes characters, symbols, etc. using three primary color signals supplied to an external input terminal onto a part of an image on a screen. In a television receiver or other display device having a structure for displaying images, a superimposing device superimposes a first image based on the first three primary color signals on a second image based on the second three primary color signals. .

Conventional technology Television receivers and various other image display devices (hereinafter collectively referred to as display devices) have characters and symbols 9 based on three primary color signals supplied to external input terminals.
In recent years, the number of display devices that have a superimpose function that allows images such as figures to be displayed on a portion of the reproduced image obtained by demodulating them inside the display device has increased. FIG. 3 shows a block diagram of an example of a conventional superimposing device that performs such superimposing. In the figure, a television receiver 1 as an example of eight displays is shown in the Electronics Industries Association of Japan (EIAJ) technical file TTC-Oo3 (
It has a 21-bin multi-connector (general connection connector) stipulated by the Japanese government (January 1983), and is compatible with superimpose compatible video equipment such as personal computers with superimpose functions, character multiplex adapters, and captain terminals. Various signals are sent and received between the two. An audio signal and a composite video signal obtained by receiving and demodulating the television receiver R1 are sent from the television receiver 1 to the video equipment 2 via the multi-connector and signal lines 3 and 5.

The video@equipment 2 mixes or switches the audio signal supplied via the signal line 3 with the audio signal generated within the video@equipment 2 and sends it to the television receiver 1 via the signal line 4. At the same time, it generates a composite synchronization signal whose frequency and phase are synchronized with the composite synchronization signal included in the composite video signal from the television receiver 1 and sends it back to the signal line 6.
It is supplied to the multi-connector of the television receiver 1 via. At the same time, the video equipment 2 receives three primary color signals of red (R), green (G) and blue (B) containing image information such as characters to be superimposed, symbols 2 and figures, and the AV
A control signal, a YM multiplied signal and a Ys multiplied signal are respectively generated and supplied to the multi-connector of the television receiver 1 via signal lines 10-12°7-9. Here, the above YM
In order to make it easier to identify the double signal superimposed image information, the contrast of images other than the superimposed image information (internal signals) among the reproduced and displayed images of the television receiver 1 is reduced. This is a control signal for performing so-called halftone, and is used as necessary.

The AV control signal is a control signal for selecting one of the internal audio and video signals received and demodulated by the television receiver 1 and the external signal input to the multi-connector. At the time of superimposition, the signal is normally fixed at a high level in order to put the audio and video of the television receiver 1 into the external signal mode. Further, it is a control signal for switching between the internal three primary color signals and the three primary color signals from the signal lines 10 to 12 from the outside on a pixel basis immediately before the video output circuit inside the Ys double signal television receiver 1. As a result, the television receiver 1 reproduces and demodulates the
Image information such as characters, symbols 1, figures, etc. generated by the video equipment 2 in images of television broadcast programs or images reproduced from a VTR or video disc player connected to the television receiver 1. is inserted and displayed.

Problems to be Solved by the Invention However, conventional superimposing devices insert and display image information based on externally input three primary color signals into an image of a composite video signal, and display two images based on two externally input three primary color signals. It was not possible to insert and display one of the two in the other. For this reason, conventionally it has not been possible to further superimpose externally input three primary color signals on a high quality three primary color signal image from a personal computer, compact disk graphics processor, digital audio disk decoder, etc. Ta.

Therefore, the present invention solves the above problems without making any changes to the conventional equipment by switching both the three primary color signals from the first and second video equipment using a switching signal from the first video equipment. The purpose of the present invention is to provide a superimposing device with

Means for Solving the Problems The superimposing device according to the present invention is a display device having a function of inserting and displaying an image based on externally input three primary color signals into a part of an image based on an internal video signal. The display device includes means for generating and supplying a control signal for controlling the external input three primary color signals to be displayed at all times, first and second video equipment, and a switching circuit. The first video device generates at least a switching signal, a first three primary color signal, and a first composite synchronization signal, and the second video device generates at least a second three primary color signal and a second composite synchronization signal. of which the second composite synchronization signal is
A first composite synchronization signal synchronized with the phase and frequency is outputted from the first video device to a display device. The switching circuit selects and outputs one of the first and second three primary color signals according to the switching signal and supplies the selected signal to the display device as an externally input three primary color signal.

Function: The switching circuit supplies the display device with the first three primary color signals taken out from the first video equipment or the second three primary color signals taken out from the second video equipment. Which of the first and second three primary color signals is supplied to the display device depends on the logical value of the switching signal.

This switching signal is a signal output from the first video equipment, and is generated with a logical value such that all of the first image based on the first three primary color signals is displayed. Therefore, the second primary color signal is supplied to the display device only during the period when the first three primary color signals are not output, and if the second three primary color signals are not output during that period, the first and second three primary color signals are supplied to the display device. None of these are supplied to the display device.

Therefore, on the display screen of the display device, the first image based on the first three primary color signals is inserted and displayed in the second image based on the second three primary color signals. That is, the first and second three primary color signals can be superimposed on each other. Note that in this case, a part of the second image may not be displayed by the first image, so in this specification, this is referred to as superimposing the first image on the second image. do. Hereinafter, the first embodiment of the present invention will be described.
This will be explained with reference to FIG.

Embodiment FIG. 1 shows a block system diagram of an embodiment of the apparatus of the present invention. In the same figure, the same components as in FIG. 3 are given the same reference numerals.
The explanation will be omitted. The first video device 13 is the same video device as the superimpose compatible video device 2 shown in FIG. The second video device 14 is a device that outputs at least R, G, and B primary color signals and a composite synchronization signal,
The device may be a personal computer, a compact disk graphics processor, a digital audio disk decoder, or the like. Second
The second image taken out from the video equipment 14 through the terminal 26
The second composite synchronization signal a as shown in the figure is supplied to the first video equipment 13 via the terminal 27 instead of the composite video signal from the television receiver R1, and is synchronized with its frequency and phase. In addition, a first composite synchronization signal shown in FIG. 2 is generated. This first composite synchronization signal is sent to the signal line 6 via the terminal 28 and supplied to the television receiver 1. Further, the AV control signal and YM double signal generated and outputted from the first video equipment 13 are sent to the signal lines 7 and 8 via terminals 29 and 30, respectively, and supplied to the multi-connector of the television receiver R1.

Further, red (R), green (G), and blue (B) regarding arbitrary first image information generated by the first video equipment 13
The primary color signals are supplied to clamp circuits 16, 18 and 20 via terminals 32, 33 and 34 as signals having waveforms as shown, for example, by C1d and e in FIG. On the other hand, the R, G, and B primary color signals related to arbitrary second image information generated by the second video equipment 14 are sent to the terminal 35 as signals with waveforms as shown at 9°h and i in FIG. Clamp circuit 17.19 and 21 via °36 and 37
Each is supplied separately. The clamp circuit 16-21 is supplied with the composite synchronizing signal or a pulse generated therefrom as a clamp pulse, clamps the pedestal level of the input primary color signal, and outputs the clamped signal.

The red signals C and 9 taken out from the clamp circuits 16 and 17 are supplied to the switching circuit 22, and the green signals d and h taken out from the clamp circuits 18 and 1 are supplied to the switching circuit 23, and then the clamp circuits 2o and 17 are supplied to the switching circuit 22. The green signals e and i taken out from 21 are supplied to a switching circuit 24. On the other hand, the first video equipment 13 synthesizes the three primary color signals C, d, and e, respectively, and generates a signal multiplied by Ys as shown in FIG. Then, this Ys multiplied signal is sent to the switching circuit 22 via the terminal 31.
．． 23 and 24 as switching signals. The switching circuits 22, 23 and 24 selectively output the respective output primary color signals of the clamp circuits 16, 18 and 20 when the Ys multiplied signal is at a high level, and on the other hand, when the Ys multiplied signal is at a low level, the switching circuits 22, 23 and 24 select and output the respective output primary color signals of the clamp circuits 16, 18 and 20, respectively, when the Ys multiplied signal is at a low level. 21 output primary color signals are selectively output.

Therefore, each output signal of the switching circuits 22, 23 and 24 is
The primary color signals of red, green and blue shown as j, k and 2 in FIG. 2 are supplied to the multi-connector of the television receiver 1 via signal lines 10, 11 and 12. Furthermore, Y extracted from the DC generator 25 is supplied to the television receiver 1.
A DC signal with a level corresponding to the high level of the s signal is Y
Since the signal is multiplied by s and supplied via the signal line 9, the television reception f! s1 is always maintained in a switched state to display image information based on externally input three primary color signals. Note that if the second video equipment 14 is outputting a high-level signal multiplied by Ys, this may be directly input to the television receiver 1.

As a result, on the playback screen of the television receiver 111,
Three primary color signals 9 to i generated by the second video equipment 14
The first image based on the three primary color signals c-e generated by the first video equipment 13 can be inserted and displayed in the second image based on the image data.

Regarding audio signals, the audio signals generated by the first and second video devices 13 and 14 are respectively supplied to a mixing/switching circuit 15, where they are mixed or switched as necessary, and then connected to the signal line 4. The signal is supplied to the television receiver 1 via the TV receiver 1. In this way, the first image based on the first three primary color signals is superimposed on the second image based on the second three primary color signals without making any changes to conventional video equipment or television receivers. This can be achieved at low cost.

Note that the present invention is not limited to the above embodiments,
Mixing/switching circuit 15. Clamp times ff116~2
1. Switching circuits 22-24. The DC generator 25 and the like may be configured to be built into the video equipment 13, 14 or the television receiver Ia1 instead of being in the form of an adapter. Also,
When halftone/full tone control is performed using the YM multiplied signal, the amplitude of each of the three primary color signals from the second video equipment 14 is attenuated by 6 (E) using the YM multiplied signal extracted from the first video equipment 13. This can be easily achieved by

Effects of the Invention As described above, according to the present invention, it is possible to produce a high-quality second image using the second three primary color signals without making any changes to the display device or the superimpose compatible video equipment combined therewith. It has the advantage of being able to superimpose a high-quality first image based on the first three primary color signals on top of the image.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention;
Figure 2 is a signal waveform diagram for explaining the operation of the device shown in Figure 1;
The figure is a block system diagram showing an example of a conventional device. 1...Television receiver with multi-connector, 2...
・Video equipment compatible with superimpose, 13...1st
video equipment, 14... second video equipment, 15... mixing/switching circuit, 16-21... clamp circuit,
22-24...Switching circuit, 25...DC generator. Patent applicant: Victor Japan Co., Ltd. Figure 2 □ Time Figure 3

Claims (1)

[Claims] A display device having a function of inserting and displaying an image based on the external input three primary color signals into a part of the image based on the internal video signal by at least a composite synchronization signal, three primary color signals and a control signal input from the outside, and the display device. means for generating and supplying to the display device a control signal for always displaying an image based on the externally input three primary color signals in place of the internal video signal, a switching signal and an arbitrary first
a first video device that outputs at least a first three primary color signal and a first composite synchronization signal related to image information; a second video device that outputs a second three primary color signal related to at least arbitrary second image information; The first video device supplies a composite synchronization signal to the first video device and synchronizes the frequency and phase of the first video device.
a second video device that outputs a composite synchronization signal from the first video device to the display device; and one of the first and second three primary color signals according to the switching signal from the first video device. 1. A superimposing device comprising a switching circuit for selectively outputting a signal and supplying the signal to the display device as the externally input three primary color signals.