JPH0515356B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention generally relates to a terminal device for a captain, and more particularly to a terminal device for a captain.
PLPS") for decoding data such as images and displaying them on the television, as well as superimposing and displaying on the television an image created by that image and an externally input NTSC composite video signal. Regarding terminal devices.

[Conventional technology]

Conventionally, a terminal device for a captain has a configuration shown in FIG. In the figure, 1 is a central processing unit (hereinafter referred to as "CPU"), 2 is a volatile working memory (hereinafter referred to as "RAM"), and 3 is a central processing unit (hereinafter referred to as "CPU").
4 is a non-volatile memory for program storage (hereinafter referred to as "ROM"), 4 is a peripheral circuit with functions such as a timer function and an interrupt control function, and 5 is the CPU.
1 is a line control circuit for exchanging data with a captain center (not shown) through a public telephone line (not shown); 6 is a remote controller for transmitting image search information from the captain terminal device 17 to the captain center; , 7 is a receiving circuit for receiving the signal from the remote controller 6, 8
1 is a read/write control circuit that controls writing and reading of data from the CPU 1 to the frame memory 9; 9 is a frame memory that stores image information; and 10 is a read/write control circuit that controls the writing and reading of data from the CPU 1 to the frame memory 9; 13 is a conversion circuit for converting a signal to conform to the input signal standard; 11 is a converter circuit for controlling the read/write control circuit 8, frame memory 9, and conversion circuit 10 in accordance with display timing; 12 is an oscillator that generates the basic clock of this device; 13 is an antenna connection terminal and a standard
This is an NTSC television receiver equipped with a 21-pin multi-connector.

Note that the captain terminal device 17 described above is
It is constituted by 1 to 12 described above.

Next, the operation of the captain terminal device configured as described above will be explained. Image information (downlink information) sent from the captain center through the public telephone line is received via the line control circuit 5,
Passed to CPU1. The CPU 1 decodes the received image information using the working RAM 2 or the peripheral circuit 4 according to the captain PLPS. At this time, a control program written inside the program storage ROM 3 controls the processing of the CPU 1. The decoded image information is written and stored in the frame memory 9 via the read/write control circuit 8. Further, a signal (upstream data) from the remote control 6 for searching an image is received by the remote control receiving circuit 7, and then sent by the CPU 1 to the captain center via the line control circuit 5 and the public telephone line. On the other hand, in the display control circuit 11
A CRT controller or a counter constantly generates an address for display, and also generates various control signals related to switching between the read/write address from the CPU 1 and the display address, or display. A read/write control circuit 8, a frame memory 9, and a conversion circuit 10 are organically connected to each other. The display information stored in the frame memory 9 is read out one after another according to the display address input from the display control circuit 11, and then signal conversion is performed by the conversion circuit 10. At this time, the display address input from the display control circuit 11,
The physical display positions of the television 13 have a one-to-one correspondence, and by performing raster scanning inside the television 13, image information is displayed as one picture. Note that the three primary colors of light, red (R) and green, are transmitted from the conversion circuit 10 to the television 13.
Analog signals and composite synchronization signals corresponding to (G) and blue (B) are input and connected via a standard 21-pin multi-connector.

[Problem that the invention seeks to solve]

Since the conventional captain terminal device is configured as described above, if, for example, you want to watch a normal television broadcast transmitted from a broadcasting station while a screen provided by the captain service is being displayed, the remote controller 6 Add a TV mode switching function to the TV and switch the mode, or use a standard that connects the TV and the captain user terminal.
Not only was the switching operation time-consuming as the 21-pin multi-connector had to be pulled out or removed, but if the timing was lost, the desired screen could no longer be viewed.

This invention was made to solve the above-mentioned problems, and allows image information to contain a specific raster image so that, for example, you can watch television broadcasts even when using a captain service. To provide a terminal device for a captain that can easily realize superimpose by specifying a color.

[Means for solving problems]

The captain terminal device according to the present invention includes:
A sync separation circuit for extracting a sync signal from an external NTSC composite video signal input from an NTSC receiver, and a sync separation circuit for reading out information stored in a storage means for display based on the extracted sync signal. The color detection circuit detects a specific raster color from a frame of image information based on the captain PLPS, and generates and outputs an image switching signal based on the detection.

[Effect]

The synchronization separation circuit and synchronization circuit in this invention detect the display position of, for example, an NTSC composite video signal and read out image information stored in the storage means accordingly, while the color detection circuit detects the display position of an NTSC composite video signal and reads out image information stored in the storage means. A specific raster color is detected from a frame of image information based on the NTSC system, an image switching signal is generated and output based on the detection, and the NTSC composite video signal and the image information are superimposed and displayed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In Figure 1, 1 is the CPU, 2 is for work
RAM, 3 is a ROM for program storage, 4 is a peripheral circuit with functions such as a timer function and an interrupt control function, and 5 is a peripheral circuit that the CPU 1 connects to a captain center (not shown) through a public telephone line (not shown).
line control circuit for exchanging information with, 6
is a remote control for sending image search information from the captain user terminal to the captain center,
7 is a receiving circuit for receiving signals from the remote controller 6; 8 is a read/write control circuit for controlling writing and reading of information from the CPU 1 to the frame memory 9; 9 is a frame memory for storing image data; 10 is a conversion circuit for converting the image information read out from the frame memory 9 into a signal conforming to the input signal standard of the NTSC television 13; 11 is the read/write circuit;
A display control circuit that controls the write control circuit 8, frame memory 9, and conversion circuit 10 in accordance with display timing, and sends addresses for display to the frame memory 9. Built-in equipment is a horizontal counter for counting display pixels and a vertical counter for counting vertical display lines. 12 is an oscillator that generates the basic clock of this device; 13 is an NTSC television equipped with an antenna connection terminal and a standard 21-pin multi-connector; and 14 is a synchronization signal from an external NTSC composite video signal input from the television 13. 15 is a synchronization circuit for reading image information from the frame memory 9 for display in accordance with the separated reference synchronization signal; 16;
is a color detection circuit that detects a specific raster color from a frame of image information according to the captain PLPS, and generates and outputs an image switching signal based on the detection.

Note that the above-mentioned captain terminal device 17 is constituted by the above-mentioned 1 to 12 and 14 to 16.

Next, the operation of the captain terminal device configured as described above will be explained. CPU1 in Figure 1,
The operations of the working RAM 2, program storage ROM 3, peripheral circuit 4, line control circuit 5, remote control 6, and remote control receiving circuit 7 are exactly the same as those of the conventional configuration example shown in FIG.
That is, according to the control program written in the program storage ROM 3, the CPU 1 decodes the image information sent from the captain center and writes it into the frame memory 9 via the read/write control circuit 8.

Conventionally, in order to read the image information written in the frame memory 9, the display control circuit 11 independently generated a synchronizing signal, that is, a horizontal synchronizing signal corresponding to the horizontal scanning of the electron beam of the television, and a horizontal synchronizing signal corresponding to the vertical scanning. A vertical synchronization signal is generated and images are displayed completely asynchronously with, for example, television broadcast images inputted from the antenna terminal of the television 13. On the other hand, in the present invention, for example, the NTSC of television broadcasting is input from the antenna terminal of the television 13.
After being demodulated inside the television, the composite video signal RF modulated wave is input to the sync separation circuit 14 via a standard 21-pin multi-connector, and the sync separation circuit 14 first extracts a horizontal sync signal and a vertical sync signal. be done.

Next, these synchronization signals are subjected to timing adjustment waveform shaping by the synchronization circuit 15, and then outputted to the display control circuit 11, and used to initialize the display control circuit 11. In other words, display control circuit 1
The horizontal counter that counts the horizontal display picture form and the vertical counter that counts the vertical display line described above in No. 1 are reset by the extracted horizontal synchronization signal and vertical synchronization signal, respectively. With this, for example, images of television broadcasting and frame memory 9
This means that the images stored in the images have been synchronized.

On the other hand, the image switching signal Ys for displaying the television broadcast image and the image stored in the frame memory 9 on the television 13 by switching pixel by pixel, for example, is generated and outputted by the color detection circuit 16 described above. Ru. i.e. Capten PLPS
When the 4-bit transparent color data 8H at . As a result, as shown in FIG. 2A, for example, images displayed by the host user terminal may appear in originally transparent colors (in reality, the phosphor on the surface of the television's cathode ray tube does not glow at all). As shown in Figure 2b, the image input from the antenna terminal of the television 13 is displayed in the area where the color is the color of the surface of the cathode ray tube, and the above two images are superimposed. It looks like it's been done.

In the above embodiment, ordinary television broadcasting is used as an example of the external NTSC composite video signal source inputted from the antenna terminal of the television 13, but the NTSC composite video signal source input from the antenna terminal of the television 13 is taken as an example. Composite video signal RF
Any device that can output modulated waves will produce similar effects. Further, in the above embodiment, the transparent color in the captain PLPS is decoded and used as an image switching signal, but other colors such as blue and red have the same effect.

〔Effect of the invention〕

As described above, according to the present invention, since the conventional captain terminal device is configured by adding a signal processing circuit for superimposing images with an external NTSC composite video signal source, it is possible to simultaneously use the television while using the captain service. The effect is that you can also watch broadcasts.

Furthermore, this invention detects a specific raster color from a frame of image information and generates an image switching signal based on the detection.
As shown in the publication, there is an information frame of the image switching signal configured in block units, and the image switching signal is generated by referring to the pattern information of the image information frame based on the information of this information frame. With a relatively simple configuration, the effect of easily realizing superimposition can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a captain terminal device according to an embodiment of the present invention, FIG. 2 is an example of display of an image by a conventional captain terminal device and a superimposed image by the captain terminal device of the present invention, and FIG.
The figure is a configuration diagram of a conventional captain terminal device. In the figure, 9 is a frame memory, and 13 is a frame memory.
NTSC television receiver, 14 is a synchronization separation circuit, 15 is a synchronization circuit, and 16 is a color detection circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1 storage means for receiving and storing the transmitted image information decoded according to a predetermined coding rule; In a captain terminal device having an NTSC receiver that inputs and displays an NTSC composite video signal from the outside, the NTSC composite video signal output from the NTSC receiver receives a horizontal synchronization signal and a a synchronization separation circuit for extracting a vertical synchronization signal; a synchronization circuit for controlling the readout timing of image information stored in the storage means using the extracted synchronization signal; and a color detection circuit that detects a color and generates and outputs an image switching signal based on the detection, and displays the NTSC composite video signal in a display area of the color detected by the color detection circuit, Superimposed with the image information
A terminal device for a captain, characterized in that the display is displayed on an NTSC receiver.