JPH066687A - Video switching device - Google Patents

Abstract

PURPOSE:To superimpose an image from a personal computer body upon a video signal which is inputted by an extension unit inserted into the personal computer. CONSTITUTION:The audio signal from the tuner part 1 of the extension unit is passed through an audio processing part 2, an audio switching circuit 4, and a sound volume control circuit 5 and outputted from an audio signal output terminal 6 and the video signal from the tuner part 1 is processed by a video processing part 7 and switched by a video switching circuit 9 with the video signal 8 from a VTR, etc.; and a Y/C separation part 10 separates the signal into the brightness signal and chromaticity signal, an RGB conversion part 13 converts the signal into a primary-color signal, and a video switching part 15 switches it with the primary-color signal 14 from the personal computer body and outputs the switched signal from a video signal output terminal 16. The synchronizing signal from the RGB conversion part 13 is separated by a synchronizing separation part 17 into the horizontal and vertical signals and a synchronism switching part 19 switches the signals with the synchronizing signal 18 from the personal computer body and outputs the signal from a synchronizing signal output terminal 20. An OR operation part 24 outputs a signal with the signal from the switching signal input terminal 23 to switch the video switching part 15 at a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video switching device such as a personal computer device (hereinafter abbreviated as a personal computer), and more particularly to a device for superimposing a video signal in an inserted extension unit.

[0002]

2. Description of the Related Art There is a personal computer in which a unit for function expansion is inserted to operate the personal computer with the function of the expansion unit. The expansion unit includes, for example, one for receiving television broadcasting, and by inserting the expansion unit, it becomes possible to listen to the television broadcasting on the monitor screen of the personal computer. However, conventionally, for example, if a personal computer screen (input screen for personal computer operation, etc.) is displayed while listening to a television broadcast, etc., the television broadcast must be switched to a signal from the personal computer main body. The broadcast screen is interrupted.

[0003]

If the screen of the signal from the personal computer can be displayed without interrupting the listening of the television broadcast, the personal computer can be switched to another operation while watching the broadcast, which is convenient. Is improved. In view of such a point, the present invention provides the expansion unit with a function of switching a video signal by a high-speed switching control signal from the personal computer main body, and superimposes the video signal taken into the expansion unit and the video signal from the personal computer main body. The purpose is to provide something that can be paused, output, and displayed on a computer monitor.

[0004]

In order to solve the above-mentioned problems, the present invention provides a personal computer or the like which operates with the function of an inserted expansion unit, which is provided in the expansion unit and receives a video signal such as a television broadcast. A video signal input section, an RGB conversion section for converting the video signal from the video signal input section into a primary color video signal, and a sync signal for the video signal from the video signal input section separated into a horizontal sync signal and a vertical sync signal. A sync separation unit, a video switching unit that switches to a video signal from the RGB conversion unit or a video signal from the personal computer body, and a sync switching unit that switches to a sync signal from the sync separation unit or a synchronization signal from the personal computer body,
A control unit that controls the synchronous switching unit by a signal input by a required operation, and a logical sum operation unit that calculates a signal from the control unit and a control signal from the personal computer body,
There is provided a video switching device configured to switch the video switching unit by a signal from the logical sum operation unit and output a video signal from the video switching unit and a synchronization signal from the synchronization switching unit.

[0005]

With the above-described structure, in the video switching apparatus according to the present invention, the video switching unit in the expansion unit is connected to the PC main body by inserting the expansion unit into the personal computer and performing the required operation. Based on the signal, the video signal taken into the expansion unit and the video signal from the PC (PC screen) are switched at high speed,
Output as a superimposed video signal and display it on a computer monitor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a video switching device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a video switching apparatus according to the present invention. In the figure, reference numeral 1 is a tuner section for receiving television broadcasts and the like. An audio processing unit 2 extracts an audio signal from the signal received by the tuner unit 1 and processes it. 3 is a voice signal,
For example, it is input from a VTR (image recording / reproducing device) or the like.
A voice switching circuit 4 switches to a signal from the voice processing unit 2 or a voice signal 3. A volume control circuit 5 appropriately adjusts the level of the audio signal from the audio switching circuit 4 and outputs it from the audio signal output terminal 6.

Reference numeral 7 denotes a video processing unit which extracts a video signal from the signal received by the tuner unit 1 and processes it. A video signal 8 is a signal (composite video signal) from the VTR or the like. A video switching circuit 9 switches to the signal from the video processing unit 7 or the video signal 8. A Y / C separation unit 10 separates the composite video signal from the video switching circuit 9 into a luminance signal and a chromaticity signal. Reference numeral 11 denotes a video signal separated into a luminance signal / chromaticity signal, which is input from, for example, a VTR. 12
Is a switching unit which is operated by, for example, inserting a connector for inputting the luminance / chromaticity separation signal from the VTR, and switches to the luminance / chromaticity separation signal 11 side. Reference numeral 13 is an RGB conversion unit, which is a switching unit 12
R (red), G (green) from the luminance / chromaticity separation signal via
And B (blue) three primary color signals. 14 is a primary color video signal, which is a signal input to the expansion unit from the personal computer body. A video switching unit 15 switches to the video signal or the video signal (primary color) 14 from the RGB conversion unit 13 and outputs the video signal from the video signal output terminal 16.

Reference numeral 17 denotes a sync separator which separates the sync signal input through the RGB converter 13 into a horizontal sync signal and a vertical sync signal. Reference numeral 18 is a sync signal, which is a horizontal sync signal and a vertical sync signal input from the personal computer body. Reference numeral 19 denotes a synchronization switching unit which switches to the synchronization signal or the synchronization signal 18 from the synchronization switching unit 18 and outputs from the synchronization signal output terminal 20. Reference numeral 21 is a control signal input terminal for inputting a signal for switching the audio switching circuit 4 and the video switching circuit 9 or the video switching unit 15 and the synchronization switching unit 19 from the personal computer body. Reference numeral 22 denotes a control unit, which performs required switching according to a signal from the control signal input terminal 21. Reference numeral 23 is a switching signal input terminal for inputting a control signal for high speed switching from the personal computer body. 24 is a logical sum operation part, which performs a logical sum operation on the signal from the switching signal input terminal 23 and the signal via the control part 22,
It is applied to the video switching unit 15.

Next, the operation of the video switching device according to the present invention will be described. By inserting the expansion unit into the PC body, the screen and audio of the PC monitor etc. are automatically switched to those of the signal taken in by the expansion unit. That is, a monitor or the like of a personal computer outputs a signal from the audio signal output terminal 6 as sound and displays an image from the video signal output terminal 16 on the screen in synchronization with the synchronization signal from the synchronization signal output terminal 20. In order to switch the output of the expansion unit to the signal output from the personal computer body, for example, a remote control signal transmitter (hereinafter abbreviated as remote control) is operated toward the personal computer body. The signal from the remote controller is input from the control signal input terminal 21 via the main body of the personal computer, and is also input to the logical sum calculation section 24 via the control section 22, which outputs the signal from the logical sum calculation section 24 and the video switching section 15 Is switched to the video signal 14 side from the personal computer, and at the same time, the synchronization switching unit 19 is switched to the synchronization signal 18 side from the personal computer.

For example, when receiving a television broadcast, the audio switching circuit 4 is moved to the audio processing unit 2 side, and the video switching circuit 9 is operated to the video processing unit by a signal from the control unit 22 based on a signal from a remote controller or the like. It is switched to the 7 side. As a result, the audio signal of the television broadcast received by the tuner unit 1 is input to the volume adjusting circuit 5 via the audio processing unit 2 and the audio switching circuit 4, and is adjusted to an appropriate signal level, and the audio signal output terminal Output from 6 and input to the audio circuit such as the monitor of the personal computer. Further, the video signal of the television broadcast from the tuner unit 1 is subjected to a required signal processing in the video processing unit 7, and the Y / C separation unit 10 is processed via the video switching circuit 9.
To a luminance signal and a chromaticity signal. The separated signals are input to the RGB conversion unit 13 via the switching unit 12, converted into the three primary color signals of R, G and B, output from the video signal output terminal 16 via the video switching unit 15, and output from the personal computer. Input to video circuit such as monitor. And RGB converter
The sync signal input to the sync separation unit 17 via 13 is separated into a horizontal sync signal and a vertical sync signal, output from the sync signal output terminal 20 via the sync switching unit 19, and input to a sync circuit such as a monitor of a personal computer. . As a result, the image and sound of the television broadcast received by the tuner unit 1 are output from the monitor or the like of the personal computer.

Further, when reproducing the VTR, the connection cord of the VTR signal is connected to the VTR connection terminal of the expansion unit, and the switching operation is performed by the remote controller or the like directed to the personal computer body. This switching operation signal is input to the control unit 22 through the control signal input terminal 21, the audio switching circuit 4 is switched to the audio signal 3 side, and the video switching circuit 9 is switched to the video signal 8 side.
The VTR separately outputs the luminance signal and the chromaticity signal, and when this signal is inserted into the corresponding socket of the expansion unit, this switching operation causes the switching unit 12 to switch between the luminance / luminance / luminance signal.
Switching to the chromaticity separation signal 11 side, the video signal from the VTR is input to the RGB conversion unit 13, processed in the same manner as described above, and input to a monitor or the like of a personal computer.

When the image of the signal from the personal computer is superimposed on the image of the video signal captured by the expansion unit, the required operation is performed on the main body of the personal computer. By this operation, a high-speed switching signal (superimpose control signal) is input to the switching signal input terminal 23 and applied to the other input terminal of the OR operation section 24, and the OR operation section 24 responds to this signal. A signal is output and the video switching unit 15 is switched and driven. Thereby, for example, the image of the signal from the personal computer body (personal computer image) is superimposed on the screen of the television broadcast or the like. In addition, when the image is switched by the remote control operation during this superimposing, the signal based on this operation is input from the control signal input terminal 21 and added to the OR operation section 24. Signal is output as a result, the video switching unit 15 is switched to the signal side of the RGB conversion unit 13 or the video signal 18 side, and the superimposing operation is stopped.

[0013]

As described above, in the video switching apparatus according to the present invention, the television broadcast signal or VTR is used.
In the expansion unit that has the function of capturing the playback signal of
Since the high-speed switching function of the video signal is provided by the superimposing signal from the personal computer, this expansion unit allows the personal computer image to be superimposed on the screen such as television broadcasting. Therefore, for example, it is convenient that the operation of switching the personal computer function can be performed while watching the television broadcast.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a video switching device according to the present invention.

[Explanation of symbols] 1 tuner section 2 audio processing section 3 audio signal 4 audio switching circuit 6 audio signal output terminal 7 video processing section 8 video signal (composite video signal) 9 video switching circuit 10 Y / C separation section 11 video signal ( Luminance / Chromaticity separation video signal) 12 Switching unit 13 RGB conversion unit 14 Video signal (primary color video signal) 15 Video switching unit 16 Video signal output terminal 17 Sync separation unit 18 Sync signal 19 Sync switching unit 20 Sync signal output terminal 21 Control Signal input terminal 22 Control section 23 Switching signal input terminal 24 Logical OR operation section

Claims (1)

[Claims] 1. In a personal computer device or the like that operates by the function of the inserted expansion unit, a video signal input section that is provided in the expansion unit and that inputs a video signal such as television broadcast, and a video signal input section An RGB converter for converting a video signal into a primary color video signal; a sync separator for separating a sync signal of the video signal from the video signal input unit into a horizontal sync signal and a vertical sync signal;
A video switching unit for switching to a video signal from the conversion unit or a video signal from the personal computer device main body, a synchronization switching unit for switching to a synchronization signal from the sync separation unit or a synchronization signal from the personal computer device main body, and a required operation. The control unit controls the synchronization switching unit according to the input signal, and the logical sum calculation unit calculates the signal from the control unit and the control signal from the main body of the personal computer, and the signal from the logical sum calculation unit. And a video switching device configured to switch the video switching unit to output a video signal from the video switching unit and a synchronization signal from the synchronization switching unit.