JPH04166888A - Video switch screen control method - Google Patents

Abstract

PURPOSE:To enhance the speed of response for keeping the fixed size of a screen, and reduce costs by adding a screen control signal to a video signal on an interface unit, and reading the screen control signal on a display unit to perform control of the screen. CONSTITUTION:A source terminal control unit which receives a KB signal for requiring its display, sends a video signal to an interface unit, the video signal is converted into the same level video signal capable of being processed in a video switch system, and then given to a video matrix controller 8. On the interface unit, a screen control signal which corresponds to the video signal sent from the source terminal control unit is preset, and the screen control signal is added to the video signal when the video signal is outputted from the interface unit. Thus, the load on a keyboard switch controller 9 is reduced, the speed of processing data for controlling the screen size becomes faster, and responsiveness is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a screen control method for a video switch, and more particularly to a video switch screen control method that can display different types of video signals with good responsiveness.

(Conventional technology) Regarding the conventional external information terminal (source terminal) system,
First, to make the explanation easier to understand, we will explain the case of the single unit in the third section.
Explain using diagrams.

FIG. 3 is a block diagram of a conventional external information terminal (source terminal) system.

In the conventional source terminal system, external information is sent to the source terminal control unit 2 through the external information line 1, and in the source terminal control unit 2, by operating the keyboard unit 6, the keyboard signal is sent to the keyboard signal line. 4, and a video signal is given to the display unit 5 via the video signal line 3 according to the content of the keyboard signal, and the display unit 5 is capable of displaying information based on the video signal. We have a system that allows us to do this. The display section 5 is usually a CRT (cathod-ray tube).
be, cathode ray tube).

The above explanation is about a conventional single external information terminal (source terminal) system, but multiple types of external information sent to multiple source terminal control units 2 are displayed on multiple display units 5.
If multiple single source terminal systems were installed in order to display the information on the screen, the operation would be extremely complicated.
In addition, since the installation space occupies a large amount of space, the video switch system described below has come to be used.

FIG. 4 is a block diagram of a conventional video switch system.

On the input side, external information is given to n different types of source terminal control units 2 via respective external information lines 1. In addition, the output side includes a plurality of display sections 5 and a keyboard section 6.
This constitutes one group of workstations 7.

Operate the keyboard section 6 in the workstation 7,
In order to select the external information to be displayed and display it on a predetermined display section 5, a key input signal is given from the keyboard section 6 to the keyboard switch controller 9, and a control signal is sent from the keyboard switch controller 9 to the switch matrix controller 8. Given. Inside the switch matrix controller 8, a specific source terminal control unit 2
and a specific display unit 5 is switched. At the same time, the keyboard switch controller 9 switches the switch to the keyboard connection line to the source terminal control unit that requests the keyboard connection line to the source terminal control unit to which the keyboard unit 6 has been connected.

By switching the switch, the keyboard switch controller 9 connects to the requested source terminal control section 2, and a keyboard signal is sent via the interface section 10.

The interface unit 10 converts the keyboard signal from the keyboard switch controller 9 into a specification that can be received by the requesting source terminal control unit 2. In this way, the display request instruction from the keyboard section 6 can be transmitted to the source terminal control section 2 via the keyboard signal line 4.

Note that the key input signals from each keyboard are common, and the keyboard signals given from the keyboard switch controller 9 to the interface unit 10 are also common, and the interface unit 10 controls various source terminals. It converts keyboard signals to the specifications of the unit.

In addition, the external information sent to the source terminal control unit 2 is
The video signal is applied as a video signal to the interface section 10 via the video signal line 3, and is converted into a video signal of common specifications that can be received and received by the switch matrix controller 8 in the interface section 10.

The video signal sent to the switch matrix controller 8 is sent to the target display unit by switching the switch inside the switch matrix controller 8, and is displayed on the target display unit 5 in the target workstation 7. It turns out.

Interface section 10 described above, switch = 4
- A video switch system 13 is constituted by a matrix controller 8, a keyboard switch controller 9, and a plurality of workstations 7 having a plurality of display units 5 and keyboards 6.

Further, in the conventional video switch system described above, an auto-scan type CRT display is usually used as the display unit 5 in the workstation 7. Auto scan detects the frequency of video signals with different frequencies and automatically adjusts the CRT scanning speed using an internal circuit.
This function enables automatic tracking) and display.

(Problem to be Solved by the Invention) However, in the auto-scan type display device in the conventional video switch system described above, when video signals of different frequencies are used, the scanning speed cannot be perfectly adjusted, resulting in a large display screen size. However, there was a problem in that the screen position was not constant.

Therefore, as shown in the block diagram of the configuration for controlling the screen of the display section in Figure 5, keyboard switch A screen control signal is mixed into the keyboard signal (KB double signal) output from the controller 9, and the screen control signal is applied from the KB (keyboard) adapter 11 to the display unit 5 via the screen control cable 12 to control the display unit 5. The display unit 5 controls the circuit that controls scanning so that the screen size and screen position are constant.
There is something to be displayed.

However, in the screen control method described above, since the keyboard switch controller 9 processes the screen control signal, the data processing speed of the keyboard switch controller 9 becomes slow, resulting in poor responsiveness to instructions from the keyboard section 6. There is a problem in that the KB adapter 11 and the screen control cable 12 from the KB adapter 11 to the display unit 5 are required, resulting in high costs.

The present invention has been made in view of the above-mentioned circumstances, and is a screen control method for maintaining video signals of different frequencies at a constant screen size in a video switch system, and is intended to increase response speed and reduce costs. The purpose is to provide a video switch system screen control method that can be used.

(Means for Solving the Problems) The present invention for solving the problems of the conventional example described above includes a plurality of source terminal control units each receiving a plurality of video signals having different parameters sent from an external information source; an interface unit that converts a video signal from the source terminal control unit; one or more display units that display the video signal; and a connection that connects a line from the interface unit to a line to the display unit. In the video switch screen control method for controlling a display screen in a video switch system having a switch matrix controller for controlling the display screen, the interface unit adds a screen control signal for controlling the screen size and blanking portion to the video signal. It is characterized by

(Function) According to the present invention, a screen control signal for keeping the screen size and screen position constant on the display unit in response to a video signal input to the source terminal control unit is set in advance in the interface unit. , the screen control signal is added to the video signal at the interface section, and the screen control signal is read at the display section to control the screen, compared to the conventional control method in which the screen is controlled by a keyboard switch controller. This reduces the load on the keyboard switch controller, improves processing speed and improves responsiveness.
Moreover, since no device such as a KB adapter is required, costs can be reduced.

(Example) An example of the present invention will be described with reference to the drawings.

The hardware configuration of the video switch system of this embodiment can be realized by the same configuration as the configuration example shown in the configuration block diagram of the conventional video switch system in FIG.

Therefore, the explanation will be given below using FIG. 4. The video switch system of this embodiment-8 is as follows: External information line 1
External information is given to the source terminal control unit 2 via
A key input signal is given to the keyboard switch controller 9 according to an instruction from the keyboard section 6, and the keyboard signal (KB double signal is sent from the keyboard switch controller 9 to the interface section 10 connected to the source terminal control section 2 for receiving the target external information). The received signal is sent to the interface section 10 where it is converted into a KB multiplied signal so that the source terminal control section 2 can receive it, and the converted KB multiplied signal is given to the source terminal control section 2 to request display on the display section 5 .

The source terminal control unit 2 that receives the KB multiplied signal of the display request sends the video signal to the interface unit 10, which converts it into a video signal of the same level that can be processed within the video switch system. The video signal thus obtained is given to the switch matrix controller 8.

The switch matrix controller 8 receives a control signal from the keyboard switch controller 9 in response to an instruction from the keyboard section 6, and switches the display section to be displayed. The data will be transmitted to the display unit 5 in the workstation 7 and displayed.

The display unit 5 is an auto-scan type display and has a function of detecting the frequency and automatically adjusting the scanning speed of the display.

In addition, in this embodiment, regarding the screen control signal for adjusting the display screen size and unspecified screen position, which occurs due to incomplete adjustment of the scanning speed, which is a drawback of auto-scan type display devices, , what kind of processing is done,
The processing method will be explained below.

Within the video switch system 1.3, the video signals are processed at the same level by the interface section 10, but the external information input to each source terminal control section 2 is
The signals are at different levels. Focusing on the function of the interface unit 10 that converts signals of different levels into the same level, screen control signals corresponding to the video signals sent from the source terminal control unit 2 are preset in the interface unit 10, and the interface unit 10
We will add a screen control signal when outputting the video signal from. The video signal to which the screen control signal has been added is sent to the display section 5 via the switch matrix controller 8.
When the screen control signal is received, the screen control signal is detected and the screen is controlled by the control circuit in the display section 5.

Conventionally, the video signal output from the interface section 10 is composed of a video signal a, a retrace signal b, and a synchronization signal C for reproducing the video screen on the display section 5, as shown in the voltage waveform diagram of FIG. However, in this embodiment, as shown in the voltage waveform diagram of FIG. 1, the screen control signal d is superimposed and added within the retrace signal.

This screen control signal d may be added to each retrace signal, or may be added to a part of the retrace signal of the video signal, for example, at the beginning of the video signal. You can do it like this.

According to the video switch screen control method of this embodiment, the fifth
Unlike the control method explained using the diagram, the keyboard switch controller 9 does not need to process screen control signals, and the load on the keyboard switch controller 9 is reduced, resulting in faster data processing and better responsiveness. This has the effect of improving the performance, and since the KB adapter 11 and the screen control signal cable 2 are no longer necessary, the cost can be reduced.

(Effects of the Invention) According to the present invention, a screen control signal that keeps the screen size and screen position constant on the display unit in response to a video signal input to the source terminal control unit is set in advance in the interface unit. In addition, the interface section adds a screen control signal to the video signal, and the display section reads the screen control signal to control the screen, making it possible to control the screen using a conventional keyboard switch controller. Compared to the control method, there is no load on the keyboard switch controller, processing speed is improved, and responsiveness is improved.
Moreover, since a device such as a KB adapter is not required, there is an effect of reducing costs.

[Brief explanation of drawings]

Fig. 1 is a voltage waveform diagram according to an embodiment of the present invention, Fig. 2 is a voltage waveform diagram of a conventional video signal, Fig. 3 is a configuration block diagram of an external information terminal (source terminal) system, and Fig. 4 is a voltage waveform diagram of a conventional video signal. FIG. 5 is a block diagram of the configuration of a conventional video switch system. FIG. 5 is a block diagram of the configuration for controlling the screen of the display unit. 1...-... External information line 2... Source terminal control section 3...
...Video signal line 4...Keyboard signal line 5...Display section 6...Keyboard section 7...・Workstation 8・・・・・・
・Switch matrix controller 9・・・・・・
... Keyboard switch controller 10 ... Interface section 11 ... KB adapter 12 ... Screen control signal cable 13 ...
・Video switch system a...Video signal b...Retrace signal C...Sync signal d...Screen Control signal

Claims (1)

[Scope of Claims] A plurality of source terminal control units each receiving a plurality of video signals having different parameters sent from an external information source; an interface unit converting the video signal from the source terminal control unit; Control of a display screen in a video switch system having one or more display units that display video signals, and a switch matrix controller that performs connection control to connect a line from the interface unit to a line to the display unit. A video switch screen control method comprising: adding a screen control signal for controlling screen size and blanking portion to the video signal in the interface section.