KR200457607Y1 - Audio and video contoller for electronic lecture, and electronic lecture system including the same - Google Patents

Abstract

An electronic teaching audio / video (AV) controller and an electronic teaching system having the same are disclosed. The AV (audio / video) controller of the present invention is an AV (Audio / Video) controller for switching audio and video signals, and includes a plurality of video input signals including a first RGB signal, a second RGB signal, and an analog video signal. And a decoder for converting and outputting a plurality of input terminals and analog video signals to a digital video signal, an RGB encoder for outputting a third RGB signal converted from a digital video signal to an RGB format signal, and first to third RGB signals. Video module including a video switch unit for receiving audio signals and selectively outputting at least two of the first to third RGB signals, and an audio input signal related to an analog video signal and an audio input signal related to the first to second RGB signals. Receiving a plurality of audio input signals including a volume control audio for adjusting the volume of the audio input signals Audio including a volume control unit for adjusting the volume of the microphone input signal input from the position portion and the at least one microphone, and a mixer circuit for mixing the output signal of the volume control audio switch unit and the output signal of the volume control unit to output to the audio output device. Module and a control module for generating a video control signal and an audio control signal in response to a user's selection, wherein the video switch unit comprises a matrix switch having a plurality of rows and columns, the first switch in response to the video control signal; And outputs one of the first to third RGB signals as the first video output signal, and outputs the other of the first to third RGB signals as the second video output signal. In response to the audio input signal associated with the first video output signal and the audio associated with the second video output signal. At least one of the input signals is selected and output.

Description

Audio / video contoller for electronic lecture, and electronic lecture system including the same}

The present invention relates to an electronic teaching system, and more particularly, to an audio / video (AV) controller for electronic teaching and an electronic teaching system having the same.

The electronic teaching system is used for lectures and education in classrooms and classrooms of schools and corporations. In general, lecturers (users) display lecture contents on computers connected to the electronic teaching system, and the contents of lectures are generally It is a system that allows the participants (students, etc.) to see a large screen by outputting it on the screen of a beam projector or a large electronic blackboard.

In the general electronic teaching system, the lecturer's monitor and the lecturer's screen are the same. In other words, the lecture contents displayed on the monitor in the general electronic desk system are displayed on the screen for the learner (for example, the beam projector screen).

In this way, when the screen for the lecturer and the screen for the lecturer are the same, it is difficult for the lecturer to lecture with reference to the lecture materials and the separate lecture materials. In addition, it is difficult to provide educational contents (or lecture materials) such as moving images and images stored in various devices (eg, TVs, DVDs, computers, etc.) in various ways.

The purpose of the present invention is to overcome the problems of the general electronic teaching system, and to fully utilize various educational contents during the lecture, and the lecturer can proceed to the lecture more conveniently and effectively while watching the lecture screen prepared separately from the lecturer's screen. The present invention provides an electronic teaching audio / video (A / V) controller for efficiently switching signals input from various sources and an electronic teaching system having the same.

According to an embodiment of the present invention to achieve the above object, in the AV (Audio / Video) controller for switching audio and video signals, a plurality of including a first RGB signal, a second RGB signal and an analog video signal A plurality of input terminals for receiving the video input signals, a decoder for converting and outputting the analog video signal into a digital video signal, and an RGB encoder for outputting a third RGB signal converting the digital video signal into an RGB format signal; A video module for receiving first to third RGB signals and selectively outputting at least two of the first to third RGB signals, an audio input signal related to the analog video signal, and the first to third RGB signals; Receiving a plurality of audio input signals including an audio input signal related to a second RGB signal; Mixing an output signal of the volume control audio control unit and a volume control unit for adjusting the volume of the audio input signal and the volume control unit for adjusting the volume of the microphone input signal input from at least one microphone and the output signal of the volume control audio switch unit And a control module for generating a video control signal and an audio control signal in response to a user's selection. The video switch unit includes a plurality of rows and columns. And a matrix switch to output one of the first to third RGB signals as a first video output signal in response to the video control signal, and to output the other of the first to third RGB signals to a second one. Outputs a video output signal, and the volume control audio switch unit is connected to the audio control signal. In response, and it outputs the selected at least one of an audio input signal related to the audio input signal and said second video output signal related to the first video output signal.
The video module receives a plurality of horizontal sync signals, switches one of the plurality of horizontal sync signals to a first horizontal sink output in response to the video control signal, and selects another one of the plurality of horizontal sync signals. A first selector that switches one to a second horizontal sink output, receives a plurality of vertical sink signals, switches one of the plurality of vertical sink signals to a first vertical sink output in response to the video control signal, and And a second selector for switching another one of the plurality of vertical sink signals to a second vertical sink output, and the first video output signal together with the first horizontal sink output and the first vertical sink output. A first output terminal for outputting to an output device, the second video output together with the second horizontal sink output and the second vertical sink output And a second output terminal for outputting a number to the second video display.
The decoder receives a first CVBS signal and a second CVBS signal, selects at least one of the first CVBS signal and the second CVBS signal in response to a CVBS selection signal output from the control module, and converts the digital video format into a digital video format. To convert.
The audio module receives the plurality of audio input signals, selects two of the input signals in response to the audio control signal, and adjusts the volume of the selected audio input signals to output first and second output signals. A volume control audio switch unit, a volume control unit for adjusting a volume of a microphone input signal input from at least one microphone, and a first output signal and an output signal of the volume control unit are mixed and output to the first audio output device; The second output signal includes a mixer circuit for outputting to the second audio output device.
The control module may include: a sub-controller generating a predefined user selection signal according to a user's selection; receiving the user selection signal from the sub-controller, and generating the video control signal according to the user selection signal. And a CPU configured to output to a video module and generate and output the audio control signal to the audio module.
The sub-controller includes a plurality of buttons, and generates the user selection signal according to selected ones of the plurality of buttons.

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As described above, according to the present invention, a variety of video inputs can be switched to two or more independent video outputs according to a user's selection in an electronic teaching system.

Therefore, the lecturer has the effect of proceeding more convenient and effective while watching the lecture screen prepared separately, unlike the screen for the learner. In addition, the lecturer's screen is fixed, and the lecturer's screen changes the video source as needed during the lecture, thereby effectively utilizing various educational contents during the lecture.

1 is a schematic structural block diagram of an electronic teaching system according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of the video module shown in FIG. 1.
3 is a functional block diagram of the audio module shown in FIG. 1.
4 is a functional block diagram of the control module shown in FIG.
5 is a schematic structural block diagram of an electronic teaching system according to another embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

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

1 is a schematic functional block of an electronic teaching system according to an embodiment of the present invention, FIG. 2 is a functional block diagram of the video module shown in FIG. 1, and FIG. 3 is a functional block of the audio module shown in FIG. 4 is a functional block diagram of the control module shown in FIG.

1 to 4, the electronic teaching system 100 according to an embodiment of the present invention includes an AV controller 110, 120, and 130, a plurality of video sources (141 to 14m, m is an integer of 2 or more), A plurality of audio sources (151-15n, n is an integer of 2 or more), two or more video output devices (161, 162), and at least one audio output device (171, 172).

The AV controller includes a control module 110, a video module 120, and an audio module 130. The control module 110 controls the switching of the video module 120 and the audio module 130 according to a user input or according to a preset value.

To this end, as shown in FIG. 4, the control module 110 may include a CPU 111 and a sub controller 112. The sub controller 112 may be installed at a position convenient for the lecturer to operate, such as the upper end of the electronic lecture table. The sub controller 112 may have a plurality of buttons that can be operated by the user. A corresponding user selection signal is generated according to the buttons selected by the user among the plurality of buttons and transmitted to the CPU 111. The CPU 111 and the sub controller 112 may be connected by an RS-232 cable, but are not limited thereto.

For example, the sub-controller 112 may be output to buttons for selecting video sources to be output to the first and second video output devices 161 and 162 and at least one audio output device 171 and 172. Buttons may be provided to independently select the audio source.

The CPU 111 receives a user selection signal output from the sub controller 112, generates a video control signal V_CON for controlling the video module 120 according to the user selection signal, and outputs the audio module 130. Generates an audio control signal A_CON for controlling.

The video module 120 includes a decoder 121, an RGB encoder 122, a video switch unit 123, and first and second selectors 124 and 125. The video module 120 also includes a first RGB input terminal 129a for receiving a first RGB signal, a second RGB input terminal 129b for receiving a second RGB signal, a first CVBS signal, and a second CVBS. The apparatus may further include first and second CVBS input terminals 128a and 128b and first and second output terminals 126 and 127 for receiving signals, respectively.

The decoder 121 receives a Composite Video Baseband Signal (CVBS), which is an analog video signal, quantizes the signal and converts the signal into digital data (eg, CCIR656 data) in MPEG video format. The decoder 121 may be implemented with a TW9900 IC chip.

The decoder 121 also receives two or more analog video signals (eg, the first CVBS signal and the second CVBS signal) and selects any one in response to the control signal V_CON_a output from the control module 110. Convert to digital video format.

The RGB encoder 122 converts a digital signal of MPEG format output from the decoder 121 into a signal of RGB format. The RGB encoder 122 may also operate in response to the control signal V_CON_b output from the control module 110.

The video switch unit 124 is an MXN matrix switch, which switches M (integer 2 or more) video input signals to N (integer 2 or more) video output signals. In the present embodiment, the video input signals are first to third RGB signals RGB 1 to RGB 3. The first and second RGB signals RGB 1 and RGB 2 may be output signals of a computer or a notebook computer. The third RGB signal RGB 3 is an output signal of the RGB encoder 122. The first video output signal VOUT1 is output to the first video output device 161 through the first output terminal 126, and the second video output signal VOUT2 is second video through the second output terminal 127. It may be output to the output device 162. Here, the first video output device 161 may be a large screen display device (eg, a beam projector screen, an electronic blackboard, an LCD, etc.) that is shown to a student (eg, students), and the second video output device 162 may be an instructor. It may be a display device (eg, a monitor, LCD, etc.) of a relatively small screen shown to the user, but is not limited thereto.

More specifically, the video switch unit 123 receives one of the first to third RGB signals RGB 1 to RGB 3 in response to the video switching control signal V_CON_c of the control module 110. As the output signal VOUT1, any one of the first to third RGB signals RGB 1 to RGB 3 is switched to the second video output signal VOUT2 and output.

The first selector 124 receives the plurality of horizontal sync signals H-Sync 1 to H-Sync 3 and responds to the video control signal V_CON_d to the plurality of horizontal sync signals H-Sync 1 to. Switching one of the H-Sync 3) to the first horizontal sink output, and switching the other of the plurality of horizontal sink signals H-Sync 1 to H-Sync 3 to the second horizontal sink output. .

The second selector 125 receives a plurality of vertical sync signals V-Sync 1 to V-Sync 3 and responds to the video control signal V_CON_d to the plurality of vertical sync signals V-Sync 1 to. One of V-Sync 3) is switched to the first vertical sink output, and the other of the plurality of vertical sink signals V-Sync 1 to V-Sync 3 is switched to the second vertical sink output. .

That is, the first and second selectors 124 and 125 may select two signals among the four input signals and output the two output signals. The first and second selectors 124 and 125 may be implemented as 4x2 multiplexers, respectively. In the present embodiment, since three signals are input to the first and second selectors 124 and 125, respectively, one input terminal may be connected to the ground.

The control signals V_CON_a, V_CON_b, V_CON_c, and V_CON_d shown in FIG. 2 are one of the video control signals V_CON shown in FIG.

The first output terminal 126 receives the first horizontal sink output and the first vertical sink output from the first and second selectors 124 and 125, respectively, and the first video output signal VOUT1 from the video switch unit 123. ) And output these signals together to the first video output device 161.

The second output terminal 127 receives the second horizontal sink output and the second vertical sink output from the first and second selectors 124 and 125, respectively, and the second video output signal VOUT2 from the video switch unit 123. ) And output these signals together to the second video output device 162.

As described above, in the present embodiment, the vertical sync signal and the horizontal sync signal are separated from the input video signal, and these signals are switched separately from the video signal (for example, the RGB signal). To this end, the RGB encoder 122 outputs the third RGB signal RGB 3 to the video switch unit 123, and the third horizontal sync signal V which is a horizontal and vertical sync signal of the third RGB signal RGB 3. Sync 3) and the third vertical sync signal H-Sync 3 are output to the first and second selectors 124 and 124, respectively.

In addition, the horizontal and vertical sink signals of the signals input to the first and second RGB input terminals 128a and 128b are separated from the RGB signals and input to the first and second selectors 124 and 125, respectively.

Referring to the operation of the video module 120 according to an embodiment of the present invention.

First and second CVBS (Composite Video Baseband Signal) signals, which are analog video inputs, are input to the decoder 121 and are quantized and converted into CCIR656 data, which is an MPEG video format. Thereafter, this digital data is converted into an RGB signal through the RGB encoder 122, and the converted RGB signal is input to the video switch unit 123 which is a matrix switch. Since the first and second RGB signals are RGB signals, they are input to the video switch unit 123 without conversion. The video switch unit 123 may be implemented with an MM1630 IC chip.

A plurality of RGB signals are input to the video switch unit 123, and the horizontal sync signal H-sync and the horizontal sync signal V-Sync included in the RGB signals are separately provided with the second and second selectors 124 and 125. The horizontal sync signal H-sync and the horizontal sync signal V-Sync are simultaneously switched to be provided to the first and second output terminals 126 and 127 according to the signal switched by the video switch unit 123. The first and second output terminals 126 and 127 may be RGB output terminals each consisting of D-sub 15-pin terminals.

The audio module 130 includes a volume control audio switch 131, a mixer circuit 132, and a volume controller 134. The audio module 130 may further include a plurality of amplifiers 135a-135j.

The volume control audio switch unit 131 has a volume control function and a matrix switch function. In detail, the volume control audio switch unit 131 receives a plurality of audio input signals CVBS 1 Audio, CVBS 2 Audio, RGB 1 Audio, and RGB 2 Audio, and controls the audio output from the control module 110. In response to the signal A_CON_a, one of the audio input signals is selected, and the volume of the selected audio signal is adjusted and output.

The volume controller 134 adjusts and outputs a volume of a microphone input signal input from at least one microphone MIC1 or MIC2. In the present embodiment, the volume adjusting unit 134 selects one of the microphone input signals input from the two microphones in response to the audio control signal A_CON_b output from the control module 110 and adjusts the volume of the selected signal. To print.

The control signals A_CON_a and A_CON_b shown in FIG. 3 are a kind of audio control signal A_CON shown in FIG. 1.

The mixer circuit 132 mixes the output signal of the volume control audio switch unit 131 and the output signal of the volume control unit 134 and outputs the mixed output signal to the audio output device.

Referring to the operation of the audio module 130 according to an embodiment of the present invention. An audio input signal (CVBS 1 audio, CVBS 2 audio) related to a CVBS signal, which is an analog video signal, and an audio input signal (RGB 1 Audio, RGB 2 Audio) related to the first and second RGB signals may be adjusted. ), An audio signal corresponding to a video output (for example, a first video output signal or a second video output signal) is selected, and the volume is adjusted and output. For example, when the first video output signal VOUT1 is the first RGB signal RGB 1, the audio input signal RGB 1 Audio related to the first RGB signal is switched by the volume control audio switch 131 and output. Can be.

The volume control audio switch 131 may be an MX1 switch and may be implemented with a TDA7439 IC chip.

Input signals of the first and second microphones MIC 1 and MIC 2 are also input to the volume adjusting unit 134 after passing through the 26 dB amplifier circuits 135g and 135h, and one of the two microphones MIC 1 and MIC 2 is selected and output.

The volume controller 134 is also a circuit having a volume control function and a switch function, and may be implemented as a TDA7448 IC chip. At this time, since the microphone output should be output together with the video signal and the audio signal corresponding to the video signal, the microphone output is finally provided to the audio output device 171 through the audio output terminal after passing through the mixer circuit 132.

In the above-described embodiment, one of the plurality of audio input signals is selected and provided to the audio output device 171, but in another embodiment of the present invention, similar to the video signal, two or more of the plurality of audio input signals These may be selected and provided to separate audio output devices 171 and 172, respectively.

In this case, the volume control audio switch unit 131 receives a plurality of audio input signals, selects two of the input signals in response to the audio control signal A_CON_a, and adjusts the volume of the selected audio signals in a first manner. And an MX2 switch that outputs a second output signal.

As described above, according to the present invention, a variety of video inputs can be switched to two or more independent video outputs according to a user's selection in an electronic teaching system. Similarly, the audio input signals may also be switched to two or more independent audio outputs according to a user's selection.

Therefore, the lecturer can proceed to the lecture more conveniently and effectively while watching the lecture screen prepared separately, unlike the screen for the students. In addition, the lecturer's screen is fixed, and the lecturer's screen can be changed to a video source as needed during the lecture, so that various educational contents can be fully utilized during the lecture.

5 is a schematic structural block diagram of an electronic teaching system according to another embodiment of the present invention. The electronic teaching system shown in FIG. 5 is similar in configuration to the electronic teaching system according to one embodiment of the present invention shown in FIGS. Therefore, to describe only the differences in order to avoid the north and south of the description, as follows.

 The video switch unit 123 and the first and second selectors 124 and 125 of the video module illustrated in FIG. 2 are implemented as one video switch unit 223 in the embodiment of FIG. 5. That is, the video switch unit 223 in the embodiment of FIG. 5 corresponds to the video switch unit 123 of FIG. 2, and the first and second selectors 124 and 125, and the mixer in the embodiment of FIG. 5. And the amplifying circuit 232 corresponds to the mixer circuit 132 and the amplifier 135 shown in FIG.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the utility model claims of the present invention.

Electronic teaching system: 100,200 video sources: 141-14 m
Audio source: 151-15n video output device: 161, 162
Audio output device: 171, 172 control module: 110
Video module: 120 Audio module: 130

Claims (9)

An audio / video controller for switching audio and video signals,
A plurality of input terminals for receiving a plurality of video input signals including a first RGB signal, a second RGB signal, and an analog video signal, a decoder for converting the analog video signal into a digital video signal and outputting the digital video signal; An RGB encoder for outputting a third RGB signal converted into a signal having a format, and a video switch unit for receiving the first to third RGB signals and selectively outputting at least two of the first to third RGB signals. A video module;
A volume control audio switch unit configured to receive a plurality of audio input signals including an audio input signal related to the analog video signal and an audio input signal related to the first to second RGB signals and to adjust a volume of the audio input signals; Audio module including a volume control unit for adjusting the volume of the microphone input signal input from one microphone, and a mixer circuit for mixing the output signal of the volume control audio switch unit and the output signal of the volume control unit to output to the audio output device; ; And
A control module for generating a video control signal and an audio control signal in response to a user selection;
The video switch unit includes a matrix switch having a plurality of rows and columns, and outputs any one of the first to third RGB signals as a first video output signal in response to the video control signal. To output the other one of the third to third RGB signals as a second video output signal,
The volume control audio switch unit, the AV controller for electronic teaching to select and output at least one of an audio input signal associated with the first video output signal and the audio input signal associated with the second video output signal in response to the audio control signal. . The method of claim 1, wherein the video module,
Receive a plurality of horizontal sync signals, switch one of the plurality of horizontal sync signals to a first horizontal sink output in response to the video control signal, and convert another one of the plurality of horizontal sync signals to a second horizontal sync signal. A first selector for switching to a sink output;
Receive a plurality of vertical sink signals, switch any one of the plurality of vertical sink signals to a first vertical sink output in response to the video control signal, and convert another one of the plurality of vertical sink signals to a second vertical A second selector for switching to a sink output;
A first output terminal configured to output the first video output signal to a first video output device together with the first horizontal sink output and the first vertical sink output; And
And a second output terminal configured to output the second video output signal to a second video output device together with the second horizontal sink output and the second vertical sink output. The method of claim 1, wherein the decoder,
An electronic teaching aid for receiving a first CVBS signal and a second CVBS signal, selecting at least one of the first CVBS signal and the second CVBS signal in response to a CVBS selection signal output from the control module, and converting the digital signal into a digital video format; AV controller. delete The method of claim 1, wherein the audio module,
A volume control audio switch that receives the plurality of audio input signals, selects two of the input signals in response to the audio control signal, and adjusts the volume of the selected audio input signals to output first and second output signals part;
A volume adjusting unit adjusting a volume of a microphone input signal input from at least one microphone; And
And a mixer circuit for mixing the first output signal and the output signal of the volume adjusting unit and outputting the mixed output signal to a first audio output device, wherein the second output signal is output to a second audio output device. delete The method of claim 1, wherein the control module,
A sub controller for generating a predefined user selection signal according to the user's selection; And
And a CPU configured to receive the user selection signal from the sub controller, generate the video control signal according to the user selection signal, output the video control signal to the video module, and generate the audio control signal to the audio module. AV controller for teaching. The method of claim 7, wherein the sub-controller,
With a number of buttons,
And the user selection signal is generated according to selected ones of the plurality of buttons. An AV controller of claim 1;
Two or more video output devices; And
An electronic teaching system comprising at least one audio output device.

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