JP2003134417A - Output device for video signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a picture with a correct aspect ratio corresponding to the format of video and to properly realize the display when a plurality of video signals are selected and supplied to a display unit. SOLUTION: A device is provided with a circuit 44 converts an information signal which accompanies a video signal and shows the aspect ratio of video display with the video signal into a common identification voltage VID. A switch circuit 46 is supplied with the identification voltage VID as its conversion result and an identification voltage accompanying a video signal of a BS digital broadcast. When the video signal of the BS digital broadcast is selected and outputted to a display unit 16, the identification voltage accompanying the video signal is taken out of the switch circuit 46 and sent out to the display unit 16. When a video signal other than a BS digital broadcast is selected and outputted to the display unit 16, the identification voltage VID as the result of conversion is taken out of the switch circuit 46 and sent out to the display unit 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal output device.

[0002]

2. Description of the Related Art As a video device, a TV tuner, B
There are S digital tuners, VTRs, DVD players, and the like, but there is a device that intensively handles video signals output from these video devices and sends them to a display.

FIG. 2 shows an outline of an example of such an output device. In this figure, as a video device,
This is the case where the BS digital tuner 11, the DVD player 12, and the VTR 13 are prepared. Then, the video signals output from these video devices 11 to 13 are supplied to the media box 14.

Although not shown, the media box 14 has a built-in TV tuner for VHF / UHF TV broadcasting so that it can receive broadcasting on any channel. Further, the media box 14 has a D / A converter circuit, a color demodulation circuit, a matrix circuit, and the like,
A device that selects one of the video signals supplied from the video devices 11 to 13 and the built-in television tuner, performs processing corresponding to the signal format on the selected video signal, and outputs a baseband three primary color signal Is.

The three primary color signals output from the media box 14 are supplied to the display 16 via the cable 15. Therefore, the media box 14
In, the video signals output from the built-in television tuner, the BS digital tuner 11, the DVD player 12, and the VTR 13 can be intensively handled, and the screen can be viewed on the display 16.

[0006]

By the way, the aspect ratio of video (screen) handled by BS digital broadcasting is 16: 9.
And 4: 3, squeeze (multi-aspect), letterbox, and standard are prepared as video formats. For this reason, in BS digital broadcasting, an identification signal indicating a video format is superimposed on a video signal and transmitted. And B
When the S digital tuner 11 outputs the received BS digital broadcast video signal, the S digital tuner 11 outputs the identification voltage VID that changes as shown in FIG. 3 based on the identification signal sent in a superimposed manner. There is.

Further, the digital output of the DVD player 12 is similar to that of the BS digital tuner 11, and the identification voltage VID is output together with the video signal. When the DVD player 12 and the VTR 13 have a so-called S terminal as an output terminal, the S terminal
The identification voltage VID is superimposed on the color subcarrier signal output from the terminal.

Further, when the VTR 13 does not have an S terminal output and when the media box 14 has a built-in television tuner, the video signal format handled is standard only, but the identification voltage VID is not output. Also, older types of video equipment have an identification voltage VID
Often there is no function to output.

As described above, depending on the video equipment 11 to 13, the format of the video signal and the format of the displayed image are different, and the output method of the identification voltage VID indicating the format of the image is also different.

However, the display device 16 needs to change the size of the horizontal deflection and the size of the vertical deflection by using the respective identification voltages VID, and display the supplied video signal as an image having a correct aspect ratio. .

In view of the above points, the present invention is capable of displaying a screen having a correct aspect ratio in accordance with the video equipment used and the format of the image, and makes the display appropriately realized. .

[0012]

According to the present invention, for example, in a device for selecting any one of a plurality of video signals and outputting it to a display device capable of changing the aspect ratio of a screen, A circuit for converting an information signal associated with the aspect ratio of the image displayed by the video signal into a common information signal, an information signal resulting from the conversion by the converting circuit, and the plurality of video signals among the plurality of video signals. A switch circuit to which an information signal associated with the predetermined video signal is supplied, and when the predetermined video signal of the plurality of video signals is selected and output to the display device, The information signal associated with the predetermined video signal is taken out and sent to the display device, and the information signal When output to the display device to select a video signal other than the predetermined video signal,
The converted information signal is taken out from the switch circuit and sent to the display device as a video signal output device. Therefore,
A common format identification voltage is sent to the display device regardless of the format of the supplied video signal.

[0013]

1 shows an example of a media box 14 and a display device 16 according to the present invention. In this example, the media box 14 has three types of video input terminals (connectors) 41D, 41S. , 41
This is the case with C. Although not shown, the input terminals 41D and 41S have a plurality of terminal contacts corresponding to the respective input signals.

The input terminal 41D is a so-called D terminal. Generally, a BS digital tuner or a DVD player is connected to the terminal 41D, and digital component signals (digital luminance signal, red and blue color difference signals) are input. And various control signals including the identification voltage VID are supplied.

The input terminal 41S is a so-called S terminal. To this terminal 41S, a video device without an output D terminal is connected, and an analog luminance signal and carrier color signal are supplied. Further, the input terminal 41C is a general video input terminal and is supplied with an analog composite video signal (a multiplexed signal of a luminance signal and a carrier color signal).

Further, the media box 14 has a VHF
・ Built-in TV tuner 42 for UHF TV broadcasting,
It is designed to receive a broadcast of an arbitrary channel and output its composite video signal. The video signal supplied to the input terminals 41D, 41S, 41C is supplied to the video processing circuit 43, and the video signal output from the television tuner 42 is also supplied to the video processing circuit 43.
Is supplied to.

Although not shown, the processing circuit 43 has a D
A / A converter circuit, a color demodulation circuit, a matrix circuit, etc., and selects one of the video signal supplied from the input terminals 41D, 41S, 41C and the video signal supplied from the television tuner 42, and the selected video The signal is processed according to the signal format and converted into baseband three primary color signals R, G and B.

Then, the converted three primary color signals R,
G and B are supplied to the display device 16 through the cable 15. Further, the horizontal synchronizing signal HD and the vertical synchronizing signal VD are taken out from the video processing circuit 43, and these synchronizing signals HD and VD are also supplied to the display device 16 through the cable 15.

In the display device 16, the three primary color signals R, G, B supplied from the media box 14 are passed through the video circuit 61 having a drive amplifier or the like, for example, a wide type CRT, that is, an aspect of a display screen. 16: 9 color CRT6
2 is supplied. Further, the synchronizing signals HD and VD supplied from the media box 14 are supplied to the deflection circuit 63 to form a horizontal deflection current and a vertical deflection current, and these deflection currents are supplied to the deflection coil 64 to horizontally and vertically deflect the CRT 62. Deflection takes place. Therefore, CRT62
The video of the video signal selected by the video processing circuit 43 is displayed on.

At this time, in order to correct the aspect ratio of the displayed image, the present invention is further configured as follows.

That is, the media box 14 is provided with a microcomputer 44 as a control circuit.
The identification voltage VID supplied to the input terminal 41D is supplied to the microcomputer 44, and the carrier color signal supplied to the input terminal 41S (the identification voltage VID is superimposed on the carrier color signal) is supplied to the microcomputer 44. Is supplied to.

Further, the video signal supplied to the input terminal 41C is supplied to the decoder 45 to determine the aspect ratio at which a video image is displayed by the video signal, and the identification voltage VID indicating the aspect ratio is extracted. The identification voltage VID is supplied to the microcomputer 44. The video signal from the television tuner 42 is also supplied to the decoder 45, the identification voltage VID is extracted, and the identification voltage VID is supplied to the microcomputer 44.

Then, the microcomputer 44 controls the video processing circuit 43 to select the video signal to be output to the display device 16 according to the instruction of the viewer.
To decide. In addition, the microcomputer 44
Of the identification voltage VID supplied thereto, the identification voltage VID associated with the video signal selected and output by the video processing circuit 43, and the aspect ratio preset by the viewer. VID is newly formed and output. The identification voltage VID newly formed by the microcomputer 44 is as shown in FIG. 3, for example.

The identification voltage VID formed by the microcomputer 44 is supplied to one input contact A of the switch circuit 46, and the identification voltage VID supplied to the input terminal 41D is the other input contact B of the switch circuit 46. Is supplied to. Further, a predetermined control signal is supplied from the microcomputer 44 to the switch circuit 46, and the switch circuit 46 is connected to the contact B when the video processing circuit 43 selects the video signal supplied to the input terminal 41D, When any other video signal is selected, it is connected to the contact A.

Thus, the identification voltage VID corresponding to the video signal selected by the video processing circuit 43 is extracted from the switch circuit 46. Then, the extracted identification voltage VID is supplied to the microcomputer 65 through the cable 15. The microcomputer 65 is for controlling the entire display device 16, and is connected to the microcomputer 44 through the cable 15 so that the display device 16 cooperates with the operation of the media box 14, for example, the media box 14. When the power of the display device 16 is turned off, the power of the display device 16 is also turned off.

Further, a predetermined control signal is supplied from the microcomputer 65 to the deflection circuit 63, and the deflection circuit 63 is
Is adapted to change the horizontal deflection size and the vertical deflection size in accordance with the identification voltage VID supplied from the switch circuit 46 to the microcomputer 65.

According to such a configuration, the input terminal 41
Of the video signals supplied to the D, 41S, and 41C and the video signals output from the tuner 42, the video signal specified by the viewer is selected by the video processing circuit 43, and the three primary color signals R, G, and B are selected. Since it is converted and supplied to the display device 16, the image of the designated video signal can be viewed by the display device 16.

At that time, the identification voltage VID corresponding to the video signal on which the image is displayed is displayed on the display device 16.
Is supplied to the CRT 62 to control the deflection size of the CRT 62, so that the displayed image has the correct aspect ratio.

Therefore, according to the media box 14, it is possible to display an image with a correct aspect ratio regardless of the aspect ratio of the displayed image. And
In that case, in the media box 14, each identification voltage VID supplied thereto is converted into a common identification voltage VID by the microcomputer 44, and the converted identification voltage VID is sent to the display device 16. Therefore, the number of lines of the cable 15 for transmitting the identification voltage VID can be reduced to one, and the circuit of the display device 16 can be simplified.

Depending on the image, it may be appropriate to change or fix the aspect ratio at the time of display according to the viewer's instruction. In such a case, one identification voltage VID and one cable 15 are also used. Can be realized by the line.

Further, when the BS digital tuner is connected to the input terminal 41D, the switch circuit 46 is not provided and the identification voltage VID of the BS digital broadcast is processed by the microcomputer 44 and sent to the display device 16. However, in BS digital broadcasting, the aspect ratio of the image changes frequently depending on the main program or commercials. Therefore, when the identification voltage VID is processed by the microcomputer 44 and sent to the display device 16, the identification voltage VID in the microcomputer 44 is changed.
The ID process may not be able to be followed, and the image may not be displayed on the display device 16 in the correct aspect ratio.

However, in the above-described media box 14, when the BS digital tuner is connected to the input terminal 41D, the identification voltage VID output from the BS digital tuner is directly applied to the display device through the contact B of the switch circuit 46. Since it is supplied to the CRT 6, even if the aspect ratio of the video changes frequently due to the main program or commercials, the CRT 6
It is possible to quickly change the aspect ratio of the image displayed in No. 2 and always display an appropriate image.

[List of abbreviations used in this specification] BS: Broadcasting Satellite CRT: Cathode Ray Tube D / A: Digital to Analog DVD: Digital Versatile Disc UHF: Ultra High Frequency VHF: Very High Frequency VTR: Video Tape Recorder

[0034]

According to the present invention, the identification voltage of the common format is sent to the display regardless of the format of the video signal, so that the line of the cable for sending the identification voltage is one. Can be reduced. Also, depending on the video, it may be appropriate to change or fix the aspect ratio at the time of display according to the viewer's instruction, but such a thing should also be realized by the common identification voltage and one line. You can

Further, when the aspect ratio of the image changes frequently like in BS digital broadcasting, the identification voltage accompanying the input signal is supplied to the display as it is, so that the change of the aspect ratio can be followed and is always appropriate. It is possible to display various images.

[Brief description of drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention.

FIG. 2 is a perspective view showing an example of an external appearance of a video system.

FIG. 3 is a table showing a relationship between a video format and an identification voltage.

[Explanation of symbols]

14 ... Media box, 15 ... Cable, 16 ... Display device, 41C ... Video input terminal, 41D ... D terminal, 41 ... S terminal, 42 ... Television tuner, 43 ... Video processing circuit, 44 ... Microcomputer, 45 ... Decoder, 46 ... Switch circuit, 61 ... Video circuit, 62 ...
Color CRT, 63 ... Deflection circuit, 64 ... Deflection coil, 6
5 ... Microcomputer

Claims (2)

[Claims] 1. A device for selecting any one of a plurality of video signals and outputting it to a display device capable of changing an aspect ratio of a screen, the image being accompanied by the video signal and displayed by the video signal. A circuit for converting an information signal related to the aspect ratio of the information signal into a common information signal, and an information signal resulting from the conversion by the conversion circuit,
A switch circuit to which an information signal associated with a predetermined video signal of the plurality of video signals is supplied, and a predetermined video signal of the plurality of video signals is selected and output to the display device. In this case, the information signal associated with the predetermined video signal is taken out from the switch circuit and sent to the display device, and a video signal other than the predetermined video signal is selected from the plurality of video signals and the display is selected. A video signal output device for taking out the converted information signal from the switch circuit and outputting it to the display device when outputting to the device. 2. The video signal output device according to claim 1, wherein the predetermined video signal is a video signal based on BS digital broadcasting.