KR101565490B1 - Method for outputting an audio signal in case of DVI display device connection of a teaching desk - Google Patents

Abstract

An electronic desk system for improving the compatibility of an electronic apparatus to be mounted, and a method for prioritizing an EDID in the electronic desk system. To this end, the present invention can convert an RGB video / audio signal of an input terminal into an RGB video / audio signal and an HDMI video / audio signal and simultaneously output them to an output terminal, and transmit the HDMI video / An electronic desk system including a main controller capable of converting video and audio signals into an output terminal at the same time and a DVI (Digital Visual Interface) display device connected to an HDMI (High Definition Media Interface) terminal of the main controller of the electronic desk system And provides a method of outputting an audio signal.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for outputting an audio signal when a DVI display device is connected to an electronic desk system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic teaching apparatus and, more particularly, to an electronic teaching apparatus having an electronic teaching system equipped with a main controller capable of improving the compatibility of electronic apparatuses mounted inside the electronic teaching apparatus, (Digital Visual Interface) terminal is connected to a High Definition Media Interface (DVI) terminal.

Typically, a lecture is a table in which a teacher or instructor places a book or a supplementary material when teaching or lecturing a large number of students in a school, academy, or company. It is usually made of wood, but sometimes it is made of plastic or metal.

In the past, the lecture desk was merely responsible for placing books or auxiliary equipment for reference by instructors or instructors. Recently, however, due to the development of various educational equipment, electronic devices equipped with various educational equipment such as monitors, computers, projectors, The desk is emerging.

Such an electronic lecture desk is installed with a monitor and other educational equipments installed together to help the convenience of the river. On the other hand, electronic apparatuses such as computer projectors, monitors, speakers, and microphones, which are mounted on an electronic desk, are evolving into a digital signal in which audio and video signals used mostly in the apparatus evolve into digital signals. However, since many video and audio electronic devices use analog voice and analog video signals in the device, compatibility with the electronic lecture desk is difficult to use. Also, when the DVI display device is connected to the main controller output terminal in the electronic desk system, there is a problem that the voice signal can not be output efficiently.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic apparatus for use in electronic timekeeping, in which an internal signal can be either a digital HDMI signal or an analog RGB signal, And to provide a desk system.

Another object of the present invention is to provide a system and a method for controlling an audio system such as a digital audio interface signal to be output efficiently.

An electronic desk system having improved compatibility according to an aspect of the technical idea of the present invention includes a console capable of mounting a plurality of electronic devices, A main controller that can convert audio signals and audio signals to HDMI video / audio signals and simultaneously output them to the output terminals, convert the HDMI video / audio signals of the input terminal into HDMI video / audio signals and RGB video and audio signals, A personal computer (PC) mounted in the console and connected to the main controller to exchange signals, and a DVI type display device connected to the main controller to extend the contents of the personal computer through the controller And a controller connected to the main controller so as to extend the contents of the personal computer through the controller Type display devices, a power amplifier mounted on the console and connected to the main controller, and a plurality of speakers connected to the power amplifier and provided outside the console.

According to an embodiment of the present invention, it is preferable that the power amplifier is connected to the audio output terminal of the main controller.

According to an embodiment of the present invention, the DVI type display devices may be connected to the main controller through an HDMI / DVI connection cable.

The main controller converts the RGB video / audio signal of the input terminal into the RGB video / audio signal and the HDMI video / audio signal and simultaneously outputs the converted RGB video / audio signal to the output terminal by using an RGB Mux, a graphic digitizer / An HDMI receiver, an audio mux, an audio A / D converter, a digital video and audio processor, a video D / A converter, an HDMI Transmitter and audio D / A converter (Audio D / A Converter).

In addition, the main controller converts the HDMI video / audio signal of the input terminal into the HDMI video / audio signal and the RGB video / audio signal and simultaneously outputs the HDMI video / audio signal to the output terminal by using a graphic digitizer / HDMI receiver, an audio mux, An audio A / D converter, a digital video and audio processor, a video D / A converter, an HDMI transmitter, and an audio D / A converter Converter (Audio D / A Converter).

According to another aspect of the present invention, there is provided a method of outputting an audio signal when a DVI display apparatus is connected to an electronic desk system, the method comprising: preparing the electronic desk system; Receiving the EDID signal of the DVI type display devices through a DDC in the personal computer; reading the EDID of the DVI type display device and storing the read EDID in an internal memory; The method comprising the steps of: modifying information in an address indicating presence of an additional block among 128 bytes of information of the EDID stored in the main controller to have additional blocks; checking the information of 128 bytes of EDID stored in the main controller; And the main controller writes EDID information of the modified 128 bytes in the internal memory Storing EDID of 256 bytes by adding an EDID of extended 128 bytes extended in the personal computer, transmitting video and audio while reading EDID of 256 bytes in the personal computer, and transmitting the video signal from the main controller to the DVI display device And outputting the voice signal to the amplifier.

According to a preferred embodiment of the present invention, when the signal input to the main controller in the personal computer is an analog RGB video signal and is an analog audio signal, the main controller performs A / D conversion of the analog audio signal, A step of including the converted digital voice signal in an HDMI signal, a step of D / A converting the digital voice signal, and a step of outputting the converted analog voice signal to an amplifier. The frequency at which the analog voice signal is subjected to A / D conversion is preferably 24.576 MHz.

According to a preferred embodiment of the present invention, when the signal input from the personal computer to the main controller is an HDMI video / audio signal, the main controller transmits the HDMI video / audio signal through an HDMI receiver Receiving the voice signal and processing the voice signal in the main controller; and D / A converting the voice signal and outputting the converted analog voice signal to the amplifier.

According to the technical idea of the present invention, in the main controller in which the electronic device is connected in the console, whether the use signal of the electronic device is a digital audio / video signal or an analog analog audio / / Can be output as a voice signal. Thus, by enabling the electronic equipment installed in the electronic desk system including the electronic apparatus to be used for the electronic desk, whether using the digital audio / video signal or the analog audio / video signal, There is an advantage that compatibility of electronic devices used in the system can be enhanced.

According to another technical idea of the present invention, when a DVI type display device is connected to a main controller of an electronic desk system, when a personal computer transmits a video / audio signal to a DVI type display device, You can avoid the problem.

1 is a schematic block diagram of an electronic desk system in which compatibility is improved according to an embodiment of the present invention.
2 is a circuit diagram for explaining functions of a main controller applied to an electronic teaching system according to a preferred embodiment of the present invention.
FIG. 3 is a flowchart for explaining a method of outputting an audio signal when a DVI display apparatus is connected to an electronic desk system according to a preferred embodiment of the present invention.
4 is a flowchart for explaining an audio signal output method when a signal input to the main controller in the personal computer of the electronic desk system is an analog RGB video signal and an analog audio signal.
5 is a flowchart for explaining an audio signal output method when a signal input from the personal computer of the electronic desk system to the main controller is an HDMI video / audio signal.

In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms and various modifications may be made. It should be understood, however, that the description of the embodiments is provided to enable the disclosure of the invention to be complete, and will fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, the constituent elements are shown enlarged for the sake of convenience of explanation, and the proportions of the constituent elements may be exaggerated or reduced.

It is to be understood that when an element is described as being "on" or "connected to" another element, it may be directly in contact with or coupled to another element, but there may be another element in between . On the other hand, when an element is described as being "directly on" or "directly connected" to another element, it can be understood that there is no other element in between. Other expressions that describe the relationship between components, for example, "between" and "directly between"

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms may only be used for the purpose of distinguishing one element from another. The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. For example, the words "comprise" or "having" are used herein to designate the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, wherein one or more other features, , Steps, operations, elements, parts or combinations thereof, may be added.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are not to be construed as ideal or overly formal in meaning unless expressly defined in the present application .

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a schematic block diagram of an electronic desk system in which compatibility is improved according to an embodiment of the present invention.

Referring to FIG. 1, an electronic desk system 100 having improved compatibility according to a preferred embodiment of the present invention includes a console 102 capable of burning a plurality of electronic devices therein. The console 102 may be equipped with various electronic devices as a part corresponding to the main body of the electronic office apparatus. Also, the electronic desk system 100 can be installed in the console 102 and convert the RGB video / audio signals of the input terminal into RGB video / audio signals and HDMI video / audio signals and simultaneously output them to the output terminals, And a main controller 200 for converting an HDMI video / audio signal into an HDMI video / audio signal and an RGB video / audio signal and simultaneously outputting the same to an output terminal. And a personal computer (PC) 106 mounted in the console 102 and connected to the main controller to exchange signals. On the other hand, the personal computer 106 can use a personal computer such as a Lap Top type personal computer, a notebook, and a tablet PC.

The electronic gaming system 100 according to the preferred embodiment of the present invention is installed in the console 102 and connected to the main controller 200 so that a voice signal is inputted to the main controller 200 from outside by a lecturer And microphone devices 118A and 118B that can be used. When the microphone device includes a wireless microphone device in the console 102 to extend the width of the copper wire of the lecturer, a wired microphone 118A may be used, or a general wired microphone or a wireless microphone 118B may be used have. The wired microphone may be a condenser type microphone or a dynamic type microphone.

Meanwhile, the electronic gaming system 100 according to the preferred embodiment of the present invention may include a first display device 110 connected to the main controller so as to extend contents of the personal computer through the main controller , The first display device 110 may be a tablet type monitor which can be used as a reference in the lecturer's console 102. [ The electronic gaming system 100 according to the preferred embodiment of the present invention may have second display devices 112A and 112B connected to the main controller 200 and installed outside the console 102. [ The second display devices 112A and 112B can be any device as long as it is a large-sized screen that can be easily viewed by the trainee. According to the present invention, a DVI type display device, a PDP device, Device, an electronic blackboard such as a touch screen, or a digital / analog type projector. The second display devices 112A and 112B may be installed in one or more than one, depending on the size and position of the lecture room.

The electronic desk system 100 according to the preferred embodiment of the present invention includes a power amplifier 114 mounted on the console 102 and connected to the main controller 200 and a power amplifier 114 connected to the power amplifier 114, And a plurality of speakers 116 installed outside the console. The power amplifier 114 is preferably connected to an audio output terminal of the main controller 200.

2 is a schematic circuit diagram for explaining functions of a main controller applied to an electronic teaching system according to a preferred embodiment of the present invention.

Referring to FIG. 2, a plurality of analog video signals (RGB IN 1, RGB IN 2) can be input to an input terminal of the main controller 200.

In this embodiment, the number of analog video signals is illustratively shown as two, but the number may be changed according to the intention of the designer if necessary. The main controller 200 is provided at its input terminal with terminals for receiving a plurality of digital video / audio signals HDMI IN 1 and HDMI IN 2. Here, the HDMI IN 1 and HDMI IN 2 terminals can transmit a video signal and an audio signal in a single cable.

Accordingly, when the analog video signals RGB IN 1 and RGB IN 2 are input to the input terminal of the main controller 200, the RGB MUX 202, Graphic Digitizer / HDMI Receiver 204, Digital Video & Audio After the signal is converted by the processor 206, the analog signal is output to the analog video signal terminal (RGB OUT 1, RGB OUT 2) at the output terminal via the video D / A converter 208. The analog video signal terminals RGB OUT 1 and RGB OUT 2 of the output terminal may be connected to a projector, which is an electronic device capable of processing an analog video signal. If the video signal to be outputted is a digital video signal, a signal is transmitted from the input terminal to the graphic digitizer / HDMI receiver 204, and the signal is converted. Then, the digital video & audio process 206, And outputs the digital video signal to the digital video signal terminals (HDMI OUT 1, HDMI OUT 2) at the output terminal through the HDMI Transmitter 210.

In the present invention, since the digital video & audio processor 206, which is the main processor, has an ability to simultaneously process analog video signals and digital video signals, Can be exported at the same time. Accordingly, there is an advantage that both the video signal used in the electronic device connected to the main controller 200 may be a digital signal or an analog signal.

In addition, a plurality of analog audio signals RGB AUDIO IN 1 and RGB AUDIO IN 2 and a plurality of other analog audio signals HDMI AUDIO IN 3 and HDMI AUDIO IN 4 are input to the input terminal of the main controller 200 Terminals are provided. When the user connects the DVI (Digital Visual Interface) video signal of the personal computer (PC) to the control channel 200 according to the present invention, the plurality of different analog audio signals (HDMI AUDIO IN 3 and HDMI AUDIO IN 4) The voice input signal should be connected separately.

Therefore, when analogue audio signals (RGB AUDIO IN 1, RGB AUDIO IN 2) and a plurality of other analog audio signals (HDMI AUDIO IN 3, HDMI AUDIO IN 4) are input to the input terminal of the main controller 200, The audio signal is converted into a digital signal called I2S (Integrated Inter-chip Sound) through the A / D converter 212 and the A / D converter 214, processed by the Digital Video & Audio Processor 206, 216 and Volume Control 218 to output audio signals to the two audio output terminals (AUDIO OUT 1, AUDIO OUT 2). After processing the audio signal in the Digital Video & Audio Process 206, audio signals are output to the two audio output terminals (AUDIO OUT 1 and AUDIO OUT 2), and the digital signal terminals (HDMI OUT 1 , HDMI OUT 2). It can also output analogue / digital audio signals to four locations: AUDIO OUT 1, AUDIO OUT 2, HDMI OUT 1, and HDMI OUT 2. At this time, a microphone device (MIC IN 1, MIC IN 2) may be connected to the volume control 218, and a power amplifier may be connected to one of audio output terminals AUDIO OUT 1 and AUDIO OUT 2.

Therefore, the main controller 200 can convert the RGB video / audio signals at the input terminal into the RGB video / audio signals and the HDMI video / audio signals and simultaneously output them to the output terminals. (RGB Mux) 202, a graphic digitizer / HDMI receiver 204, an audio mux 212, an audio A / D converter 214, a digital video and audio processor And an audio D / A converter 216. The audio D / A converter 216 converts the video signal to a digital video signal.

Conversely, the main controller 200 can convert the HDMI video / audio signal at the input terminal into the RGB video / audio signal and the HDMI video / audio signal and output them simultaneously to the output terminal, A digital video / audio processor 206, a digital D / A converter 204, an audio mux 212, an audio A / D converter 214, a digital video and audio processor 206, A converter (Video D / A converter) 208, an HDMI transmitter (Transmitter) 210, and an audio D / A converter (Audio D / A converter)

FIG. 3 is a flowchart for explaining a method of outputting an audio signal when a DVI display apparatus is connected to an electronic desk system according to a preferred embodiment of the present invention.

Referring to FIG. 3, first, the electronic desk system as shown in FIGS. 1 and 2 is prepared (S100). At this time, a DVI-type display device and an RGB display device can be connected to the main controller as a display device, which can be an LCD monitor, a tablet PC, a digital signal-based projector, or an RGB- A projector or a monitor may be used. Then, in order to use the electronic voting system, a personal computer sends and receives a hot plug detector (HPD) output signal to the display devices (S110).

The HPD output signal is a pin which is present in the HDMI cable adapter and is used for the purpose of confirming hardware which the display device is connected to the output terminal of the personal computer. Normally, when a voltage of 2.0 V or more is detected on the transmission side and 2.4 V or more is detected on the reception side, it is recognized.

Then, the EDID signal of the display devices is recognized through an HDMI terminal of the personal computer through a display data channel (DDC) (S120). The DDC is a digital communication standard between transmitting and receiving apparatuses that enables information of a display apparatus to be transmitted to an adapter. Therefore, the monitor which is a display device includes a ROM which is a memory that stores mode information that can be displayed by the manufacturer. The data contained in the ROM is in a format called EDID, and the format is publicly defined by the Video Electronics Standards Association (VESA).

At this time, if the display device is of the DVI type instead of the HDMI type as in the present invention, the personal computer transmits only the video signal except for the audio signal. This is because the Extended Display Identification Data (EDID) of the DVI type display device includes information of the display device for the video signal except for the voice signal as 128 byte data including only block 0. Therefore, when the HDMI terminal of the main controller is connected to the DVI terminal of the display device, only the 128-byte information of the block 0 is read and only the video signal is transmitted from the HDMI terminal when the EDID is read.

On the other hand, the EDID of the HDMI type display device is composed of block 0 (128 bytes) and block 1 (128 bytes) according to the VESA (Video Electronics Standards Association) standard and has a total 256 byte format. At this time, the 128 byte information of the block 1 includes information on the voice signal. Therefore, in order to transmit all the video and audio signals from the HDMI to the external display device, in addition to the 128-byte information of the block 0 of the EDID of the DVI type display device received in the previous S120, 256 bytes EDID < / RTI > According to the present invention, in the electronic desk system, the main controller separates a voice signal from a TMDS (Transition Minimized Differential Signaling) signal of an HDMI signal and outputs it to an amplifier and a speaker through an analog audio terminal.

To this end, in the present invention, the following procedure is performed in the main controller to output a voice signal when the DVI type display device is connected. First, the EDID of the DVI type display device is stored in the internal memory in the main controller (S130). Subsequently, the information of the address indicating the presence or absence of the block 1 among the 128 byte EDID information of the stored block 0 is modified (S140). Specifically, the EDID of the block 0 according to the VESA standard is the information that the 126th address 7EH indicates whether the additional block 1 exists or not. If the information of the migration site is 0, block 1 does not exist. If it is 1, it means that information of block 1 exists. Also, EDID information of the DVI type display device and an address indicating check sum information within 128 bytes are present. Since the data has been modified in step S140, the new check sum data is modified (S150). This is a modification of the data at address 127, 7Fh.

Subsequently, 128 bytes of EDID information corresponding to block 1 stored in the internal memory of the main controller are combined with the DVI type EDID (corresponding to block 0) to generate 256 bytes of EDID and stored (S160). Thereafter, the video and audio signals are transmitted to the external output device using the 256-byte EDID information newly stored in the main controller at the HDMI terminal of the personal computer (S170). At this time, the video signal from the main controller is sent to the DVI type display device, and the audio signal is separated from the audio signal and transmitted to the amplifier and speaker (S180).

4 is a flowchart for explaining an audio signal output method when a signal input to the main controller in the personal computer of the electronic desk system is an analog RGB video signal and an analog audio signal.

Referring to FIG. 4, if the signal coming from the personal computer to the main controller is the analog voice signal S 200, the main controller performs analog-to-digital conversion (S 210) of the analog signal. At this time, it is suitable to perform the conversion by applying 24.576 MHz as the frequency for performing the analog / digital conversion. Then, the main controller stores the converted digital audio signal in the HDMI information (S220). The main controller then converts the converted digital voice signal to the original analog voice signal by performing digital-to-analog conversion (S 230). At this time, it is suitable to perform the conversion by applying the frequency of 24.576 MHz to perform the conversion. Finally, the analog voice signal converted into the analog voice signal is outputted to the speaker S 240 through the amplifier Amp.

5 is a flowchart for explaining an audio signal output method when a signal input from the personal computer of the electronic desk system to the main controller is an HDMI video / audio signal.

Referring to FIG. 5, when the digital audio signal S 300 enters the main controller, the main controller processes the digital audio signal received through the HDMI receiver (S 310). Thereafter, the digital voice signal is again converted into an analog voice signal by digital / analog conversion (S320). At this time, the digital / analog conversion can be performed by applying an audio clock frequency of the HDMI receiver in the main controller. Finally, the analog voice signal converted into the analog voice signal is output to the speaker S 330 through the amplifier Amp.

It will be apparent to those skilled in the art that the present invention is not limited to the above-described embodiment and that many modifications are possible within the technical scope of the present invention.

100: electronic desk system, 102: console,
200: main controller, 106: personal computer (PC)
110: first display device, 112: second display device,
114: power amplifier (AMP), 116: speaker, 118: microphone device.

Claims (10)

delete delete delete delete delete A console capable of mounting a plurality of electronic devices; The RGB video / audio signal of the input terminal can be converted into the RGB video / audio signal and the HDMI video / audio signal and output to the output terminal at the same time, and the HDMI video / A main controller which converts the video and audio signals into an audio signal and an audio signal at the same time; A personal computer (PC) mounted in the console and connected to the main controller to exchange signals; DVI type display devices connected to the main controller so as to extend contents of the personal computer through the controller; An RGB type display device connected to the main controller so as to extend the contents of the personal computer through the controller; A power amplifier mounted on the console and connected to the main controller; And a plurality of speakers connected to the power amplifier and provided outside the console, the method comprising: preparing an electronic desk system having improved compatibility;
Exchanging an HPD signal with a DVI type display device through the main controller in the personal computer;
Recognizing an EDID signal of the DVI type display devices through a DDC in the personal computer;
Reading the EDID of the DVI type display device and storing the EDID in an internal memory;
Modifying information of an address indicating presence / absence of an additional block among 128-byte information of the EDID stored in the main controller to have additional blocks;
Correcting checksum information among 128 byte information of the EDID stored in the main controller;
The main controller further adding an EDID of an extended 128 bytes stored in the internal memory to the EDID information of the modified 128 bytes and storing the EDID of 256 bytes;
Transmitting video and audio while reading EDID of 256 bytes in the personal computer; And
Wherein the main controller sends the video signal to the DVI display device, and the audio signal is separated and sent to the amplifier. The method according to claim 6,
When the signal input to the main controller in the personal computer is an analog RGB video signal and is an analog audio signal,
A / D converting the analog voice signal and converting the analog voice signal into a digital voice signal;
Embedding the converted digital voice signal into an HDMI signal; And
Converting the digital voice signal into an analog voice signal; And
And outputting the converted analog audio signal to an amplifier. The method of claim 1, wherein the analog audio signal is a digital audio signal. 8. The method of claim 7,
Wherein the frequency of A / D conversion of the analog audio signal is 24.576 MHz. The method according to claim 6,
When the signal input to the main controller in the personal computer is an HDMI video / audio signal,
Receiving an audio signal from the HDMI video / audio signal through an HDMI receiver and processing the HDMI video / audio signal in the main controller;
Converting the voice signal into an analog voice signal; And
And outputting the converted analog audio signal to an amplifier. The method of claim 1, wherein the analog audio signal is a digital audio signal. 10. The method of claim 9,
The step of D / A converting the audio signal includes:
And converting an audio clock frequency of the HDMI receiver into an audio clock frequency of the HDMI receiver.

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