KR101195179B1 - Hdmi video signal switching device and digital broadcasting system having the same - Google Patents

Abstract

PURPOSE: An HDMI image signal switching device and a digital broadcast system with the same are provided to change a real time screen without picture disconnection without a separate expensive image converting device. CONSTITUTION: A matrix switching unit(120) includes a plurality of switching IC(Integrated Circuit)s. An EDID(Extended Display Identification Data) providing unit(140) provides EDID data to an external HDMI(High Definition Multimedia Interface) transmitting device(10). When an HD(High Definition) image signal is not outputted from the matrix switching unit, a dummy signal generating unit(150) supplies a dummy image signal to an external HDMI receiving device(20). An RGB input unit(310) includes one or more RGB input terminals. An image digital converting unit(320) converts an outputted RGG image signal into an HD image signal. [Reference numerals] (10) External HDMI(High Definition Multimedia Interface) transmitting device; (110) HDM input unit; (120) Matrix switching unit; (130) HDMI output unit; (140) EDID providing unit; (150) Dummy signal generating; (160) Association control unit; (20) HDMI receiving device; (30) RGB transmitting device; (310) RGB input unit; (322) Chromakey process section; (324) Image effect process section; (330) Image signal selection unit; (340) Image analog converting unit; (350) RGB output unit; (40) RGB receiving device

Description

HD video signal switching device and digital broadcasting system having same {HDMI VIDEO SIGNAL SWITCHING DEVICE AND DIGITAL BROADCASTING SYSTEM HAVING THE SAME}

The present invention relates to an HDMI video signal switching device and a digital broadcasting system having the same, and more particularly, to an HDMI video signal switching device capable of real-time screen switching with almost no screen interruption, and a digital broadcasting system having the same.

Public institutions, companies or schools are introducing small digital broadcasting equipment for events or education. Currently, digital broadcasting systems mainly adopt the HDMI (High Definition Multimedia Interface) standard.

In order to support such HDMI, EDID (Extended Display Identification Data) information is required. EDID refers to a type of video format supported by a display device, and the like. Include.

In the conventional digital broadcasting system, when a video signal of one of a plurality of video signals is switched to another video signal, the screen may be disconnected for 1 to 2 seconds while the HDMI transmitter and the HDMI receiver check the EDID. . The Video Electronics Standard Association (VESA), a group that promotes the standardization of video and multimedia devices, uses HDMI and Digital Visual Interface (DVI) signal processing methods to transmit high-definition digital signals without loss and ensure compatibility between various electronic devices. Because it is prescribed. Therefore, since the EDID is first checked between the HDMI transmitter and the HDMI receiver, and then the video signal is transmitted, a delay occurs while a channel is formed between the HDMI transmitter and the HDMI receiver.

For example, when an HDMI input terminal 2 is arbitrarily selected among the HDMI input terminals 1, 2, and 3, and an HDMI output terminal 1, 2, and 3 is arbitrarily connected to the HDMI output terminal 3, the HDMI transmitter connected to the HDMI input terminal 2 The HDMI receiver connected to the HDMI output terminal 3 checks the EDID. The process of checking the EDID by the HDMI transmitter and the HDMI receiver usually takes 1 to 2 seconds, and in this process, video and audio are not output to the HDMI receiver. In addition, if the HDMI receiver is a TV or a display device, <no signal> may be displayed during the EDID process. Therefore, the viewer may misunderstand such a display as a bad equipment or a broadcast accident when it is linked with an output modulator of a broadcast.

In order to avoid such video interruption, a high-capacity baseband signal of HD-SDI (Serial Digital Interface) is used instead of a digital signal, and an HD-SDI switching device is an expensive device that exceeds several million won. In addition, if you want to use HD-SDI signals, not only cameras, which are HDMI transmitters, but also TVs and display devices, which are HDMI receivers, must be equipped with HD-SDI. Should be.

In order to solve the above problems, an object of the present invention is to provide an HDMI video signal switching device capable of real-time screen switching with almost no screen interruption and a digital broadcasting system having the same.

Another object of the present invention is to provide an HDMI video signal switching device capable of converting a digital video signal and an analog video signal and a digital broadcasting system having the same.

In order to achieve the object of the present invention, the HDMI video signal switching device according to the present invention, the HDMI input having a plurality of HDMI input terminals that can be connected to the external HDMI transmitter, and a plurality of HDMI outputs that can be connected to the external HDMI receiver An HDMI output having a terminal; a matrix switching unit having a plurality of switching ICs for connecting each HD video signal output from each of the plurality of HDMI input terminals to each of the plurality of HDMI output terminals; An EDID providing unit for supplying EDID data to the external HDMI transmitting device through a DDC channel of an input terminal, and a dummy for supplying a dummy video signal to the external HDMI receiving device when there is no output of an HD video signal from the matrix switching unit. It includes a signal generator.

Each of the switching ICs may be a multiplexer and may receive all the HD video signals from the plurality of HDMI input terminals and output only one selected HD video signal.

The EDID provider may provide 1080i in a default mode.

The dummy image signals supplied by the plurality of dummy signal generators may be HD image signals output from the matrix switching unit.

The dummy image signals supplied from the plurality of dummy signal generators may be black image signals.

The HDMI video signal switching device may further include an RGB input unit having at least one RGB input terminal connectable to an external RGB transmission device, and an image digital converter for converting an RGB image signal output from the RGB input unit into an HD image signal. Can be.

The HDMI video signal switching device may select one of an HD video signal output from any one of the plurality of HDMI input terminals and an HD video signal output from an image digital converter and provide the video signal selection unit to the matrix switching unit. It may further include.

The image digital converter may perform a process of transforming or removing a specific color or selecting a background from the RGB image signal output from the RGB input unit, and applying a fade effect, a mosaic effect, or a transparent overlap effect.

In accordance with another aspect of the present invention, there is provided a digital broadcasting system comprising: a plurality of HDMI transmitters for outputting an HD video signal; an HDMI input unit having a plurality of HDMI input terminals connectable to each of the plurality of HDMI transmitters; A matrix switching unit having an HDMI output unit and a plurality of switching ICs for connecting each HD video signal output from each of the plurality of HDMI input terminals to each of the plurality of HDMI output terminals; EDID providing unit for supplying the EDID data to the HDMI transmission device through the DDC channel of the, and a dummy signal generation unit for supplying a dummy image signal to the corresponding HDMI output terminal when there is no output of the HD video signal from the matrix switching unit An HDMI video signal switching device, and an encoder for encoding an HD video signal input through the plurality of HDMI output terminals; And a multiplexer for multiplexing the MPEG-2 TS signals encoded by the encoder, and a modulator for modulating and transmitting the multiple MPEG-2 TS signals output from the multiplexer into a wireless broadcast signal by applying 8VSB technology. By including the HD code modulation device, the above-described object can be achieved.

With the above-described arrangements, the present invention can provide a real-time screen switching with almost no screen interruption without introducing a separate expensive image converting apparatus or the like.

In addition, the present invention can provide a mutual conversion of a digital video signal and an analog video signal without introducing a separate expensive video conversion device.

1 is a block diagram of an HDMI video signal switching device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating the HDMI video signal switching device shown in FIG. 1 in more detail.
3 is a block diagram of an HDMI video signal switching device according to another embodiment of the present invention.
4 is a block diagram of a digital broadcasting system including an HDMI video signal switching device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a block diagram of an HDMI video signal switching device according to an embodiment of the present invention, Figure 2 is a view showing in more detail the HDMI video signal switching device shown in FIG.

As shown in FIG. 1, the HDMI video signal switching device 100 includes an HDMI input unit 110, a matrix switching unit 120, an HDMI output unit 130, an EDID providing unit 140, and a dummy signal generating unit 150. ) And an image controller 160.

The HDMI input unit 110 receives an HD video signal from the HDMI transmitter 10. As illustrated in FIG. 2, the HDMI input unit 110 may include a first HDMI input terminal 212, a second HDMI input terminal 214, and a third HDMI input terminal 216 that may be connected to the HDMI transmitter 10. Equipped. In addition, the HDMI input unit 110 may further include amplifiers 272, 274, and 276 connected to the respective HDMI input terminals 212, 214, and 216.

The matrix switching unit 120 connects each of the plurality of HDMI input terminals 212, 214, and 216 of the HDMI input unit 110 to each of the plurality of HDMI output terminals 232, 234, and 236 of the HDMI output unit 130. Connect. As shown in FIG. 2, the matrix switching unit 120 outputs the respective HD video signals of the plurality of HDMI input terminals 212, 214, and 216 of the HDMI input unit 110 to the plurality of HDMI terminals of the HDMI output unit 130. A first switching IC 222, a second switching IC 224, and a third switching IC 226 are provided to connect to each of the output terminals 232, 234, 236.

As shown in FIG. 2, the HD video signal amplified by the first amplifier 272 is provided to all of the plurality of switching ICs 222, 234, and 236, and the second amplifier 274 and the third amplifier are the same. The HD video signal amplified by the amplifier 276 is also provided to all of the plurality of switching ICs 222, 234, and 236. As a result, each of the plurality of switching ICs 222, 234, and 236 may be a multiplexer, and only one HD video signal is selected and output by the control signal of the image controller 160.

The HDMI output unit 130 transmits an HD video signal to the HDMI receiver 20. As shown in FIG. 2, the HDMI output unit 130 may include a first HDMI output terminal 232, a second HDMI output terminal 234, and a third HDMI output terminal 236 that may be connected to the HDMI receiver 20. It is provided. In addition, the HDMI output unit 130 may include a first image buffer memory (not shown), a second image buffer memory (not shown), and a second image buffer for temporarily storing the HD image signals output from the matrix switching unit 120, respectively. Three image buffer memories (not shown) may be provided.

The EDID provider 140 supplies EDID data through a DDC channel of a corresponding HDMI input terminal connected to the HDMI transmitter 10. The EDID providing unit 140 provides a first EDID storage element 242, a second EDID storage element 244, and a third EDID to provide EDID data to each of the plurality of HDMI input terminals 212, 214, and 216. Storage element 246 may be provided. The plurality of EDID storage elements 242, 244, and 246 of the EDID providing unit 140 may be a flash memory or an EEPROM, but may be an SRAM.

The EDID provider 140 supplies 1080i to the HDMI transmitter 10 in a default mode. In addition, when the special HDMI receiver 20 is connected to any one of the plurality of HDMI output terminals 232, 234, and 236, the EDID provider 140 may select and change an EDID value from the outside.

The dummy signal generator 150 supplies a dummy video signal to the HDMI receiver 20 when there is no output of the HD video signal from the matrix switching unit 120. The dummy signal generator 150 may include a first dummy signal generator 252, a second dummy signal generator 254, and a third dummy signal generator for supplying a dummy image signal to the HDMI receiver 20. 256).

When the buffer memory is provided in the HDMI output unit 130, the dummy signal generator 150 may output the HD video signal temporarily stored in the buffer memory when the HD video signal is not output from the matrix switch 120. ) To generate a dummy video signal by being controlled to continuously output the HD video signal. In addition, even when the buffer memory is provided in the HDMI output unit 130, the dummy signal generator 150 may generate a black image in the buffer memory if the HD image signal is not output from the matrix switching unit 120. Can be.

The image control unit 160 controls the connection between the plurality of HDMI input terminals 212, 214, and 216 and the plurality of output terminals 232, 234, and 236 in the matrix switching unit 120. 140 and the dummy signal generator 150. The image controller 160 is for explanation and may be configured in an external device.

Hereinafter, an operation flow of an HDMI video signal switching device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

When power is supplied to the HDMI video signal switching device 100, the video controller 160 determines whether the HDMI transmitter 10 is connected to each of the plurality of HDMI input terminals 212, 214, and 216. 10) Check if power is supplied.

The image controller 160 controls the EDID provider 140 to provide the EDID information through the HDMI input terminals to which the HDMI transmitter 10 is electrically connected. For example, the first HDMI transmitter 12 is electrically connected to the first HDMI input terminal 212, and the second HDMI transmitter 14 is electrically connected to the second HDMI input terminal 214. In this case, the EDID providing unit 140 supplies EDID data to the respective HDMI transmitters 12 and 14 through the DDC channels of the first HDMI input terminal 212 and the second HDMI input terminal 214. The first HDMI transmitter 12 and the second HDMI transmitter 14 generate and output an HD video signal using EDID data received through a DDC channel. In this case, the EDID provider 140 may supply 1080i to the HDMI transmitter 10 in a default mode.

Meanwhile, the image controller 160 transmits the EDID information transmitted from the corresponding HDMI receiver 20 connected to each of the plurality of HMDI output terminals 232, 234, and 236 of the HDMI output unit 130 to the corresponding HDMI transmitter. Control not to.

In addition, the image controller 160 controls the plurality of switching ICs 222, 224, and 226 using matrix information stored in the storage unit (not shown). For example, the first HDMI receiver 22 is connected to the first HDMI output terminal 232 of the HDMI output unit 130, and the third HDMI receiver 20 is connected to the third HDMI output terminal 236. And the matrix information is information connecting the first HDMI output terminal 232 to the first HDMI input terminal 212 and the third HDMI output terminal 236 to the second HDMI input terminal 214. The controller 160 provides information about the corresponding HDMI input terminal to the first switching IC 222 and the third switching IC 226. Accordingly, the first switching IC 222 may select and output the HD video signal of the first HDMI input terminal 212, and the third switching IC 226 may output the HD video of the second HDMI input terminal 214. The signal can be selected and output.

The HD video signal of the first HDMI input terminal 212 selected by the first switching IC 222 is supplied to the HDMI receiving device 20 through the first HDMI output terminal 232, and the third switching IC 226 is provided. The HD video signal of the second HDMI input terminal 214 selected by the second HDMI input terminal 214 is supplied to the HDMI receiver 20 through the third HDMI output terminal 236.

On the other hand, when the third HDMI transmitting device 16 is electrically connected to the third HDMI input terminal 216 of the HDMI input unit 110, the image control unit 160 via the DDC channel of the third HDMI input terminal 216. The EDID data is supplied to the third HDMI transmitter 16, and the third HDMI transmitter 16 outputs the HD video signal using the EDID data.

Thereafter, when the user inputs to output the HD video signal of the third HDMI input terminal 216 to the first HDMI output terminal 232, the image controller 160 inputs the third HDMI input to the first switching IC 222. Information for selecting the terminal 216 is provided, and the first switching IC 222 selects the third HDMI input terminal 216.

Conventionally, when such a switching transition occurs, the EDID is checked between the third HDMI transmitter 16 and the first HDMI receiver 22 connected to the first HDMI output terminal 232. The process usually takes 1 to 2 seconds, and in this process, video and audio do not come out of the first HDMI receiver 22.

However, in the present embodiment, even when such switching switching occurs, since the HD video signal is input to the third input terminal from the third HDMI transmitter 16 in advance by the third EDID storage element 246, the matrix switching unit 120 The connection time according to the operation of) can be reduced.

In addition, since the HD video signal is continuously provided to the first HDMI receiver 22 by the first dummy signal generation element 252 even when the switching in the matrix switching unit 120 occurs, the first HDMI receiver 22 does not provide EDID information through the DDC channel of the first HDMI output terminal 232. As a result, even when such switching switching occurs, the image can be provided to the HDMI receiver 20 in almost real time.

3 is a block diagram of an HDMI video signal switching device according to another embodiment of the present invention.

The HDMI video signal switching device 300 shown in FIG. 3 includes the HDMI input unit 110, the matrix switching unit 120, the HDMI output unit 130, the EDID providing unit 140, and the dummy signal generation unit illustrated in FIG. 1. In addition to 150, an RGB input unit 310, an image digital converter 320, an image signal selector 330, an image analog converter 340, and an RGB output unit 350 are included.

The HDMI input unit 110 receives an HD video signal from the HDMI transmitter 10.

The RGB input unit 310 receives an RGB image signal from the RGB transmitter 30. A plurality of RGB input terminals (not shown) of the RGB input unit 310 may be provided in the same manner as the HDMI input terminals 212, 214, and 216 of FIG. 2.

The image digital converter 320 converts the RGB image signal output from the RGB input unit 310 into an HD image signal. That is, the image digital converter 320 converts an RGB image signal having various resolutions such as 480i, 720p, and 1080p into, for example, an HD image signal of 1080i.

In addition, the image digital converter 320 may include a chroma key processing section 322 and a screen effect processing section 324. The chroma key processing section 322 removes a specific color from the RGB image signal input from the RGB input unit 310 or selects and transforms the background. The picture effect processing section 324 provides a fading effect, a mosaic effect, or a transparent overlapping effect on the RGB image signal input from the RGB input unit 310.

The image signal selector 330 selects any one of an HD image signal of the third HDMI input terminal 216 of the HDMI input unit 110 and an HD image signal output from the image digital converter 320 to perform a matrix switching unit ( 120). According to the present invention, the video signal selector 330 can be used to simplify signal wiring and reduce switching ICs.

The matrix switching unit 120 connects each of the first HDMI input terminal 212, the second HDMI input terminal 214, and the image signal selection unit 330 to a plurality of HDMI output terminals 232, of the HDMI output unit 130. 234 and 236, respectively.

The HDMI output unit 130 may include an image buffer memory for transmitting the HD image signal to the HDMI receiver 20 and temporarily storing the HD image signal output from the matrix switching unit 120, respectively.

The image analog converter 340 converts the HD image signal selected and output by the matrix switching unit 120 into an RGB image signal, and the RGB output unit 350 transmits the RGB image signal to the RGB receiver 40. .

The EDID provider 140 may supply EDID data through a DDC channel of a corresponding HDMI input terminal connected to the HDMI transmitter 10 and may supply 1080i in a default mode.

The dummy signal generator 150 supplies a dummy video signal to the HDMI receiver 20 when there is no output of the HD video signal from the matrix switching unit 120. When the buffer memory is provided in the HDMI output unit 130, the dummy signal generator 150 may output the HD video signal temporarily stored in the buffer memory when the HD video signal is not output from the matrix switch 120. The dummy video signal may be generated to continue output until the HD video signal is input from

4 is a block diagram of a digital broadcasting system including an HDMI video signal switching device according to an embodiment of the present invention.

As shown in FIG. 4, the digital broadcasting system 400 includes a plurality of HDMI transmitters 12, 14, and 16, an HDMI video signal switching device 100, and a plurality of HD code modulators 410, 420, and 430. , Combiner 440, system control device 450, and a plurality of digital TVs 22, 24, and 26.

The plurality of HDMI transmitters 12, 14, and 16 may include a camcorder, a camera, a Blu-ray, and the like.

As illustrated in FIGS. 1 and 2, the HDMI video signal switching device 100 outputs each HD video signal output from each of the plurality of HDMI input terminals 212, 214, and 216 to a plurality of HDMI output terminals 232. , 234, 236 for the connection to each of the switching devices. In addition, the HDMI video signal switching device 100 may be replaced with the HDMI video signal switching device 300 shown in FIG. 3 when the RGB transmission device 30 shown in FIG. 3 is to be connected.

Each of the plurality of HD code modulators 410, 420, and 430 includes an encoder 412, a multiplexer 414, and a modulator 416.

The encoder 412 encodes an HD video signal output from a plurality of HDMI output terminals 232, 234, and 236 of the HDMI video signal switching device 100 using a compression technique. The encoder 412 applies a moving picture expert group (MPEG) 2 technology, which is a video compression technique, to encode and output an HD video signal output from the corresponding HDMI output terminal into an MPEG-2 TS (Transport Stream) signal.

The multiplexer 414 multiplexes the MPEG-2 TS signals encoded by the encoder 412 and outputs the multiplexed signal to the modulator 416.

The modulator modulates the multiple MPEG-2 TS signals outputted from the multiplexer into RF (Radio Frequency) broadcast signals by applying 8VSB technology.

The combiner 440 mixes RF broadcast signals transmitted from each of the plurality of HD code modulation devices 410, 420, and 430, and transmits them to the plurality of digital TVs 22, 24, and 26 as digital broadcast signals.

The system control device 450 controls each device of the digital broadcasting system, including a user input device (not shown) and a monitor (not shown). In this case, the system controller may control the HDMI video signal switching device 100 through an RS-232 / 485 interface, and control the plurality of HD code modulation devices 410, 420, and 430 through a LAN. have.

The plurality of digital TVs 22, 24, and 26 may be provided with scaling to provide an appropriate image on each display screen.

The protection scope of the present invention should be interpreted by the following claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It should be interpreted that it is included in the scope of right.

110: HDMI input unit 120: matrix switching unit
130: HDMI output unit 140: EDID control unit
150 dummy signal generating unit 160 image control unit
310: RGB input unit 320: video digital conversion unit
330: Image signal selector 340: Image analog converter
350: RGB output unit

Claims (12)

An HDMI input having a plurality of HDMI inputs that can be connected to an external HDMI transmitter;
An HDMI output unit having a plurality of HDMI output terminals that can be connected to an external HDMI receiver;
A matrix switching unit including a plurality of switching ICs for connecting each HD video signal output from each of the plurality of HDMI input terminals to each of the plurality of HDMI output terminals;
An EDID provider for supplying EDID data to the external HDMI transmitter through a DDC channel of a corresponding HDMI input terminal;
A dummy signal generator for supplying a dummy video signal to the external HDMI receiver when there is no output of the HD video signal from the matrix switching unit;
An RGB input unit having at least one RGB input terminal connectable to an external RGB transmitting device;
And an image digital converter for converting an RGB image signal output from the RGB input unit into an HD image signal. The method of claim 1,
Each switching IC comprises a multiplexer and receives all the HD video signals from the plurality of HDMI input terminals and outputs only one selected HD video signal. The method according to claim 1 or 2,
And the EDID provider provides 1080i in a default mode. The method according to claim 1 or 2,
And a dummy image signal supplied from the plurality of dummy signal generators is an HD image signal output from the matrix switching unit. The method according to claim 1 or 2,
And a dummy image signal supplied from the plurality of dummy signal generators is a black image signal. delete The method according to claim 1 or 2,
And a video signal selector for selecting one of the HD video signal output from any one of the plurality of HDMI input terminals and the HD video signal output from the video digital converter and providing the selected video signal to the matrix switching unit. HDMI video signal switching device. The method according to claim 1 or 2,
The image digital converting unit performs a process of transforming or removing a specific color or selecting a background from the RGB image signal output from the RGB input unit and applying a fading effect, a mosaic effect, or a transparent overlapping effect. Video signal switching device. A plurality of HDMI transmitters for outputting HD video signals,
An HDMI input unit having a plurality of HDMI input terminals connectable to each of the plurality of HDMI transmitters, an HDMI output unit having a plurality of HDMI output terminals, and a plurality of switching ICs, A matrix switching unit for connecting each HD video signal output from each of the plurality of HDMI output terminals, an EDID provider for supplying EDID data to a corresponding HDMI transmitter via a DDC channel of the corresponding HDMI input terminal; An RGB input unit including a dummy signal generation unit for supplying a dummy image signal to a corresponding HDMI output terminal when there is no output of an HD video signal from the matrix switching unit, at least one RGB input terminal connectable to an RGB transmission device, and HDMI video signal switch with video digital converter to convert RGB video signal output from RGB input to HD video signal With ching device,
An encoder for encoding the HD video signals input through the plurality of HDMI output terminals, a multiplexer for multiplexing the MPEG-2 TS signals encoded by the encoder, and multiple MPEG-2 TS output from the multiplexer And an HD code modulation device having a modulator for modulating and transmitting a signal into a wireless broadcast signal by applying 8VSB technology. 10. The method of claim 9,
Wherein each switching IC comprises a multiplexer and receives all HD video signals from the plurality of HDMI input terminals and outputs only one selected HD video signal. delete 11. The method according to claim 9 or 10,
The HDMI video signal switching device may select one of an HD video signal output from any one of the plurality of HDMI input terminals and an HD video signal output from an image digital converter and provide the video signal selection unit to the matrix switching unit. Digital broadcasting system further comprises.

Images