TWI556649B - Video channel control system and video channel control method - Google Patents

Description

Video channel control system and video channel control method

The present invention relates to video transmission, and more particularly to a video channel control system and a video channel control method.

In recent years, due to the rapid development of multimedia audio and video technology, various video transmission devices and video playback devices with different functions have appeared on the market. In order to enhance the convenience and flexibility of consumers in viewing video, how to improve the video transmission mechanism between video transmission devices is very important.

Please refer to FIG. 1A and FIG. 1B. FIG. 1A and FIG. 1B are schematic diagrams showing different video transmission mechanisms between conventional video transmission devices. As shown in FIGS. 1A and 1B, whether the same display device DIS1 is to display video signals from different input devices IN1 and IN2, or the video signals from the same input device IN1 are shunted to different display devices DIS1 and DIS2. Since the control module 5 needs to be coupled to all the video transmission devices VT1~VT3 at the same time, each level of the video transmission devices VT1~VT3 is respectively provided with a control port F1~F3 and a connection line coupled with the control module 5. CB1~CB3. Once the video needs to transmit a long distance or the number of video transmission devices is large, the entire video transmission mechanism will become quite complicated and the cost will be greatly increased, which is not conducive to its market competitiveness.

Therefore, the present invention provides a video channel control system and a video channel control method to solve the above problems encountered in the prior art.

One aspect of the present invention is to propose a video channel control system. In one embodiment, the video channel control system includes a control module, a first video transmission device, and a second video transmission device. The first video transmission device includes a plurality of video transmission interfaces and processing modules. The control module is configured to provide a communication control signal including control information. The first video transmission device is coupled to the control module and receives the communication control signal. The video transmission interface is configured to transmit a digital video signal or an analog video signal, and includes a plurality of first video data transmission channels. The processing module is coupled to the first video data transmission channels for generating control commands according to the communication control signals. The first video transmission device outputs a control command through one of the first video data transmission channels according to the control information. The second video transmission device is coupled to the first video transmission device for transmitting a digital video signal or an analog video signal. The second video transmission device includes at least one second video data transmission channel, and receives a control command from the first video transmission device through the second video data transmission channel.

In practical applications, the video transmission interface may be a Video Graphics Array (VGA) transmission interface, a Digital Video Interface (DVI) or a High Definition Multimedia Interface (HDMI); The first or second video data transmission channels may be Display Data Channel (DDC), Red Green Blue (RGB) channel, Transition-Minimized Differential Signaling (TMDS) channel, and consumer electronics. Control (Consumer Electronics Control, CEC) channel or horizontal and vertical (HV) channel. The first video transmission device may be a matrix video switch (Matrix Video Switch), a video switcher (Switch) or a video splitter (Splitter), and the second video transmission device may be a video compensator (Booster), a matrix video device. Switcher, video switcher or video splitter.

The first video transmission device can be coupled to the second video transmission device through the first and second video data transmission channels to perform a communication handshake between the second video transmission device and the first video transmission device to transmit a control command; When the second video transmission device receives the control command, the second video transmission device performs transmission, switching, port control, power control, reset, status reading, and version identification of the digital video signal or the analog video signal according to the control command. Or the control of each button function. The control command can be an Inter-Integrated Circuit (I ² C) communication bus signal, a Universal Asynchronous Receiver/Transmitter (UART) signal, or a Universal Serial Bus (USB). Signal. The control module outputs a communication control signal to the first video transmission device through a Universal Asynchronous Receiver/Transmitter (UART) transmission interface, an RS232 transmission interface or a USB transmission interface.

The video channel control system can further include a third video transmission device. The third video transmission device is coupled to the second video transmission device for transmitting the digital video signal or the analog video signal. The third video transmission device includes at least one third video data transmission channel, and receives a control command from the second video transmission device through the third video data transmission channel. When the second video transmission device receives the control command, the second video transmission device outputs the digital video signal or the analog video signal to the third video transmission device according to the control command. The second video transmission device is coupled to the third video transmission device through the second and third video data transmission channels to perform a communication handshake between the third video transmission device and the second video transmission device to transmit the control command.

Another aspect of the present invention is to provide a video channel control method. In one embodiment, the video channel control method is applied to at least a plurality of first video data transmission channels of the first video transmission device and at least one second video data transmission channel of the second video transmission device. The video channel control method includes the following steps: (a) providing a communication control signal, wherein the communication control signal includes a control information; (b) generating a control command according to the communication control signal; and (c) transmitting the first information according to the control information One of the video data transmission channels outputs a control command; (d) receives a control command from the first video data transmission channel through the second video data transmission channel.

Compared with the prior art, the video channel control system and the video channel control method proposed by the present invention utilize a display data channel (Display Data Channel, which is used to obtain an Extended Display Identification Data (EDID) of the display device. DDC) establishes a communication handshake mechanism to realize communication between video transmission devices at all levels, so that it can achieve the purpose of cascade control of video transmission equipment. Since the video transmission device can directly transmit control commands through the display data channel, etc., only the video port and the video cable that have been set up can complete the transmission of the cascade command. No additional overhead control and connection lines are required, which saves costs.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

The invention establishes a communication handshake mechanism through the display data channel which has been set up to obtain the extended display identification code of the display device, so as to realize communication between the video transmission devices at all levels, so that the video transmission device cascade can be achieved. For the purpose of control, and without the need to additionally set the cascade control and connection lines, it can also save costs.

A first preferred embodiment of the present invention is a video channel control system. In this embodiment, the video channel control system includes at least one video input device, a plurality of video transmission devices, and at least one video output device. The video transmission devices are serially connected between the video input device and the video output device. Each video transmission device includes its own video data transmission channel.

Please refer to FIG. 2, which is a functional block diagram of an embodiment of the video channel control system. As shown in FIG. 2, the video channel control system 1 includes a control module 10, a first video transmission device 11, a second video transmission device 12, and a third Video transmission device 13, video input device 14, and video output device 15. The first video transmission device 11, the second video transmission device 12, and the third video transmission device 13 are connected in series between the video input device 14 and the video output device 15; the control module 10 is coupled to the first video transmission. Device 11. In fact, the video input device may be a personal computer, a DVD player, a game machine or any other device having a function of providing video, and is not particularly limited; the video output device may be a liquid crystal screen, a digital television, a conventional television or There are no specific restrictions on other devices that have video output capabilities. The control module 10 can be provided separately from any video transmission device, and can be disposed together with any video transmission device, and is not particularly limited. The control module 10 is, for example, a device such as a touch screen or a notebook computer that allows a user to input a control signal. In this embodiment, the first video transmission device 11 includes a processing module 110 and a plurality of first video data transmission channels 113', 115'-117'; and the second video transmission device 12 includes a plurality of second video data. The transmission channels 123'-127'; the third video transmission device 13 includes a plurality of third video data transmission channels 133'-137'.

As can be seen from FIG. 2, the first video transmission device 11, the second video transmission device 12, and the third video transmission device 13 connected in series between the video input device 14 and the video output device 15 are used to input the video input device 14. The provided video signal VS is transmitted to the video output device 15 for the video output device 15 to play or display the video signal VS. For example, if the video input device 14 is a DVD player and the video output device 15 is a digital television, the video input device (DVD player) 14 plays the video signal VS provided by the DVD movie through the first video transmission device. 11. The second video transmission device 12 and the third video transmission device 13 are transmitted to the video output device (digital television) 15, and then the video output device (digital television) 15 displays the video signal VS for viewing by the user. In fact, the video signal VS can be a digital video signal or an analog video signal, and there is no specific limitation.

Please also refer to Figure 3, which shows the video channel control system in Figure 2. Detailed diagram of the system 1. As shown in FIG. 3, the first video transmission device 11 includes a processing module 110, a plurality of first video transmission interfaces 113, 115-117, and a control command transmission interface 114; the first video transmission interfaces 113, 115-117 respectively The first video data transmission channels 113', 115'~117' are included. The second video transmission device 12 includes a plurality of second video transmission interfaces 123-127, and the second video transmission interfaces 123-127 respectively include second video data transmission channels 123'-127'; the third video transmission device 13 includes a plurality of The third video transmission interfaces 133 to 137 and the third video transmission interfaces 133 to 137 respectively include the third video data transmission channels 133' to 137'. In practical applications, the video transmission interfaces may be a Video Graphics Array (VGA) transmission interface, a Digital Video Interface (DVI), a High Definition Multimedia Interface (HDMI), or Other transmission interfaces with video transmission functions for transmitting digital video signals or analog video signals.

As shown in FIG. 3, the video signal VS provided by the video input device 14 is input to the first video transmission device 11 through the first video transmission interface 113, and the communication control signal CS including the control information provided by the control module 10 is provided. It is input to the first video transmission device 11 through the control command transmission interface 114. In fact, the control module 10 can output the communication control signal CS to the first video transmission device 11 through a Universal Asynchronous Receiver/Transmitter (UART) transmission interface, an RS232 transmission interface, a USB transmission interface, or other signal transmission interface. .

The control information included in the communication control signal CS may be the destination information for transmitting the video signal VS, or the function that the user desires the first video transmission device 11, the second video transmission device 12, or the third video transmission device 13 to perform, for example, Turn on port 关闭, close port 埠, switch port 电源, power control, reset, status read, version recognition, or button control, but not limited to this.

In this embodiment, it is assumed that the control information of the communication control signal CS includes the destination information for transmitting the video signal VS, and the destination for transmitting the video signal VS is the video output device 15. When the processing module 110 of the first video transmission device 11 receives the communication control signal CS from the control module 10, the processing module 110 generates a control command CMD according to the communication control signal CS, and according to the communication control signal CS. The control information outputs a control command CMD through one of the first video data transmission channels 113', 115'-117', for example, the control command CMD is output through the first video data transmission channel 115'. In fact, the control command CMD can be an Inter-Integrated Circuit (I ² C) communication bus signal, a Universal Asynchronous Receiver/Transmitter (UART) signal, or a Universal Serial Bus (Universal Serial). Bus, USB) signal, but not limited to this. It can be seen from the above that the control information in the communication control signal CS can also include selectively transmitting a control command CMD through one of the first video data transmission channels 113', 115'~117'. Information. Similarly, the control information may include the first video transmission device 11 selectively outputting the video signal VS from the video input device 14 through one of the first video transmission interfaces 115-117.

It should be noted that, in this embodiment, the first video transmission device 11 is coupled to the second video transmission device 12 through the first video data transmission channel 115' and the second video data transmission channel 124' for performing the second video transmission. The communication between the transmission device 12 and the first video transmission device 11 is handed over to transmit a control command CMD. Therefore, the first video transmission device 11 transmits the control command CMD outputted by the first video data transmission channel 115' to the second video transmission interface 124 of the second video transmission device 12 through the first video transmission interface 115. The second video data transmission channel 124' is received. In fact, the first video data transmission channel 113', 115'~117' or the second video data transmission channel 123'~127' may be a Display Data Channel (DDC), a Red Green Blue (RGB) channel, Minimize differential transmission signals (Transition-Minimized Differential Signaling, TMDS) channels, Consumer Electronics Control (CEC) channels, horizontal and vertical (HV) channels, or other similar transmission channels are not specifically limited.

It should be noted that, if the destination of the transmission video signal VS is a video output device (not shown) coupled to the second video transmission device 12, when the second video transmission device 12 receives the control command CMD, the second video message The transmission device 12 will output the video signal VS to the video output device according to the control command CMD. However, since the destination of the video signal VS is coupled to the video output device 15 of the third video transmission device 13 instead of the second video transmission device 12, the second video transmission device 12 is also The video signal VS and the control command CMD need to be output to the third video transmission device 13. In this embodiment, the second video transmission device 12 is coupled to the third video transmission device 13 through the second video data transmission channel 127' and the third video data transmission channel 133' to perform the third video transmission device. 13 communicates with the second video transmission device 12 to transmit a control command CMD to the third video transmission device 13.

Therefore, the second video transmission device 12 can transmit the control command CMD outputted by the second video data transmission channel 127' to the third video transmission interface 133 of the third video transmission device 13 from the second video transmission interface 127. The video data transmission channel 133' is received. In fact, the third video data transmission channels 133'-137' may be Display Data Channel (DDC), Red Green Blue (RGB) channels, and Transition-Minimized Differential Signaling (TMDS) channels. There are no specific restrictions on Consumer Electronics Control (CEC) channels, horizontal and vertical (HV) channels, or other similar transmission channels. Finally, the third video transmission device 13 outputs the video signal VS from the third video transmission interface 135 to the video output device 15 through the third video transmission interface 133 according to the control command CMD.

Next, please refer to FIG. 4A, FIG. 4B and FIG. 4C. FIG. 4A, FIG. 4B and FIG. 4C respectively show the first video transmission device 11, the second video transmission device 12 and the third video transmission. The device 13 performs timing diagrams of different functions at different times. It should be noted that, in FIG. 4A, FIG. 4B and FIG. 4C, the first video transmission device 11, the second video transmission device 12, and the third video transmission device 13 perform a video switcher on the analog video signal. The function. As shown in FIG. 4A, FIG. 4B and FIG. 4C, at time t0, the first video transmission device 11, the second video transmission device 12, and the third video transmission device 13 respectively start reading/writing the coupled video. The extended display identification data (EDID) of the output device does not end the program of reading/writing until time t1.

Next, the first video transmission device 11, the second video transmission device 12, and the third video transmission device 13 all perform the VGA output handshake procedure from time t1. During the period from time t2 to time t3, the first video transmission device 11 will receive the communication control signal CS from the control module 10. At time t3, the first video transmission device 11 starts the handshake process of the VGA input until time t4.

During the period from time t3 to time t4, the first video transmission device 11 performs the VGA input handshake procedure, and the second video transmission device 12 continues the VGA output handshake procedure, so that the first video transmission device 11 and the first Communication between the two video transmission devices 12 can be performed. Therefore, during the period from time t3 to time t4, the second video transmission device 12 can receive the video signal VS from the first video transmission interface of the first video transmission device 11 through the second video transmission interface.

Then, during the period from time t4 to time t5, the first video transmission device 11 receives the response signal from the second video transmission device 12, and the second video transmission device 12 has received the first video transmission device 11 Past video signal VS. After receiving the response signal, the first video transmission device 11 transmits the control command CMD to the second video transmission device 12 during the period from time t5 to time t6, that is, The second video transmission device 12 receives the control command CMD during the period from time t5 to time t6.

When the second video transmission device 12 has received the video signal VS and the control command CMD from the first video transmission device 11 during the period from time t3 to time t4 and time t5 to t6, respectively, the first video transmission device 11 Complete the functions it should perform. During the period from time t6 to time t7, the second video transmission device 12 will perform a VGA input handshake procedure according to the control command CMD. Since the third video transmission device 13 continues to perform the handshake process of the VGA output during the period from time t6 to time t7, the communication between the second video transmission device 12 and the third video transmission device 13 can be performed. Therefore, during the period from time t6 to time t7, the third video transmission device 13 can receive the video signal VS from the second video data transmission channel of the second video transmission device 12 through the third video data transmission channel.

Then, during the period from time t7 to time t8, the second video transmission device 12 receives the response signal from the third video transmission device 13, and the third video transmission device 13 has received the second video transmission device 12. Past video signal VS. After receiving the response signal, the second video transmission device 12 transmits the control command CMD to the third video transmission device 13 during the period from time t8 to time t9, that is, during the period from time t8 to time t9 of the third video transmission device 13. The control command CMD is received internally. When the third video transmission device 13 has received the video signal VS and the control command CMD from the second video transmission device 12 during the period from time t6 to t7 and time t8 to t9, respectively, the second video transmission device 12 Complete the functions it should perform. At time t9, the third video transmission device 13 will start to perform an action according to the control command CMD, for example, transmitting the video signal VS to the video output device for the video output device to play, open the port, close the port, switch the port, Power control, reset, status reading, version identification or button control, but not limited to. .

It should be noted that, as shown in FIG. 4C, the third video transmission device 13 performs the handover procedure of the VGA output from time t1, but the second video transmission device 12 continues to perform the VGA output until time t2'. Since the program is handed over, communication communication between the third video transmission device 13 and the second video transmission device 12 is still impossible. Therefore, during the period from time t2' to time t3', the third video transmission device 13 re-reads/writes the extended display identification data of the coupled video output device.

Next, please refer to FIG. 4D, FIG. 4E and FIG. 4F. FIG. 4D, FIG. 4E and FIG. 4F show the first video transmission device 11, the second video transmission device 12, and the third video transmission device 13. A timing diagram that performs the functions of a video splitter for a digital video signal. It should be noted that the difference between the function of the analog video signal and the video signal converter of the analog signal in FIG. 4A to FIG. 4C is that the digital video signal in this example is sequentially transmitted through the third video transmission device 13 and the second video. The transmission device 12 transmits to the first video transmission device 11 in the opposite direction to the above example. In addition, the first video transmission device 11 performs a handshake procedure of the HDMI input and the HDMI output during the period from time t1 to time t2 and during the period from time t3 to time t4; the second video transmission device 12 is during the period from time t1 to time t5. During the period from time t6 to time t7, the handshake procedure of HDMI input and HDMI output is performed separately; the third video transmission device 13 performs HDMI input during the period from time t1 to t2' and during the period from time t3' to time t8. Hand over the program.

Please refer to FIG. 5, which is a functional block diagram of another embodiment of the video channel control system. As shown in FIG. 5, the video channel control system 1 also includes a control module 10, a first video transmission device 11, a second video transmission device 12, a third video transmission device 13, a video input device 14, and a video output device. 15. It should be noted that the difference between the fifth picture and the second picture is that the video signal VS provided by the video input device 14 in FIG. 5 is sequentially transmitted through the third video transmission device 13, the second video transmission device 12, and the A video transmission device 11 transmits to the video output device 15 and the video information provided by the video input device 14 in FIG. The order of the number VS transmitted to the video output device 15 through the first video transmission device 11, the second video transmission device 12, and the third video transmission device 13 is reversed.

However, in the fifth embodiment, the communication control signal CS provided by the control module 10 is transmitted to the first video transmission device 11, and the processing module 110 of the first video transmission device 11 generates control according to the communication control signal CS. Commanding CMD, and outputting a control command CMD through the first video data transmission channel included in the first video transmission interface 113, 115~117 according to the control information in the communication control signal CS, and then sequentially transmitting the first video transmission device 11 and The communication handshake mechanism between the second video transmission device 12 outputs the control command CMD to the second video transmission device 12, and then the communication handshake mechanism between the second video transmission device 12 and the third video transmission device 13 The control command CMD is output to the third video transmission device 13. FIG. 6 is a detailed schematic diagram of the video channel control system 1 in FIG.

Next, please refer to FIG. 7. FIG. 7 is a schematic diagram showing another embodiment of the video channel control system. As shown in FIG. 7, the video channel control system 2 includes a control module 20, a first video transmission device 21, a second video transmission device 22, video input devices 24A-24D, and a video output device 25. The first video transmission device 21 includes a processing module 210, a plurality of video transmission interfaces N1~N4, K1~K4, and an RS232 transmission interface, and the video transmission interfaces N1~N4 and K1~K4 respectively include a video data transmission channel N1'. ~N4', K1'~K4'; the second video transmission device 22 includes a processing module 220, video transmission interfaces 221 and 222, and the video transmission interface 221 includes a video data transmission channel 221'.

In a practical application, the first video transmission device 21 may be a matrix video switch (Matrix Video Switch), a video switcher (Switch) or a video splitter (Splitter), and the second video transmission device 22 may be a video compensator. (Booster), matrix video switcher, video switcher or video splitter, but not limited to this.

In this embodiment, the video input devices 24A to 24D respectively provide the first video signal VS1 to the fourth video signal VS4, and the first video transmission device 21 receives the first video signal VS1 to the fourth video through the video transmission interfaces N1 to N4, respectively. Signal VS4. The control module 20 provides the communication control signal CS and transmits the communication control signal CS to the processing module 210 through the RS232 transmission interface of the first video transmission device 21. The communication control signal CS includes control information. Then, the processing module 210 generates a control command CMD according to the communication control signal CS, and selectively outputs the control command CMD to the video data transmission channel K4' according to the control information, or selectively selects the VS4 according to the control information or the control command CMD. The video transmission interface K4 is transmitted.

Since the first video transmission device 21 in this embodiment is a matrix video switcher, it is assumed that the first video transmission device 21 switches to output the fourth video signal input by the video input device 24D according to the control information or the control command CMD. VS4, and the video transmission interface K4 is selected for output to the second video transmission device 22. At this time, the video data included in the video transmission interface 221 of the second video transmission device 22 is outputted through the video data transmission channel K4'. The data transmission channel 221' is then transmitted to the processing module 220. Then, the processing module 220 outputs the fourth video signal VS4 to the video output device 25 through the video transmission interface 222 according to the control command CMD, so that the video output device 25 displays the fourth video signal VS4.

In this embodiment, it is assumed that the distance between the video input devices 24A-24D and the first video transmission device 21 (matrix type video switcher) is different, that is, coupled to the video input devices 24A-24D and the first video transmission device 21 ( The length of the connection line between the matrix type video switchers is 40 meters, 30 meters, 20 meters, and 10 meters, respectively. The second video transmission device 22 is a video compensator (Booster), and can be correspondingly compensated for the fourth video signal VS4 input to the second video transmission device 22, and then output to the video output device 25.

A second preferred embodiment of the present invention is a video channel control method. In this embodiment, the video channel control method can be applied to a video channel control system, but is not limited thereto. The video channel control system includes at least one video input device, a plurality of video transmission devices, and at least one video output device. The video transmission devices are serially connected between the video input device and the video output device. Each video transmission device includes its own video data transmission channel.

In fact, the video input device can be a personal computer, a DVD player, a game console or any other device having a video input function, and is not particularly limited; the video output device can be a liquid crystal screen, a digital television, a conventional television or other There are no specific restrictions on devices with video output.

In this embodiment, it is assumed that the video channel control system includes three video transmission devices serially connected between the video input device and the video output device, namely, the first video transmission device, the second video transmission device, and the third video transmission. And the first video transmission device, the second video transmission device, and the third video transmission device respectively include a plurality of first video data transmission channels, at least one second video data transmission channel, and at least one third video data transmission channel.

It should be noted that the number of video input devices, video output devices, and video transmission devices may be determined according to actual needs, and is not limited thereto. For example, it may be the setting of one video output device by multiple video input devices, or the setting of one video input device to multiple video output devices, or the setting of multiple video input devices to multiple video output devices. Yes.

Please refer to FIG. 8. FIG. 8 is a flow chart showing a method for controlling a video channel of this embodiment. As shown in FIG. 8, first, in step S10, the video input device provides a video signal. In fact, the video signal can be a digital video signal or an analog video signal, and there is no specific limitation. Next, the method performs step S12 to provide a communication control signal including control information to the first video transmission device. In the steps In S14, the first video transmission device generates a control command according to the communication control signal. In step S16, the first video transmission device outputs a control command through one of the first video data transmission channels according to the control information. In the step S18, the method couples the first video transmission device and the second video transmission device through the first and second video data transmission channels to perform communication communication between the second video transmission device and the first video transmission device. And transfer control commands. In step S20, the second video transmission device receives the control command and the video signal from the first video data transmission channel through the second video data transmission channel. In the step S22, the method is coupled to the second video transmission device and the third video transmission device through the second and third video data transmission channels to perform communication communication between the third video transmission device and the second video transmission device. And transfer control commands. In step S24, the third video transmission device receives the control command and the video signal from the second video data transmission channel through the third video data transmission channel. In step S26, the third video transmission device outputs the video signal to the video output device for the video output device to display the video signal.

Compared with the prior art, the video channel control system and the video channel control method proposed by the present invention establish a communication handshake mechanism by using, for example, a display data channel originally used to obtain an extended display identification code of the display device, so as to realize video transmission at all levels. Communication between devices can achieve the purpose of cascade control of video transmission equipment. Since the video transmission device can directly transmit control commands through the display data channel, only the video connection port and the video transmission cable that have been set up can complete the transmission of the cascade command without additional cascading control and connection. Lines can save costs.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

S10~S26‧‧‧ Process steps

1, 2‧‧‧ video channel control system

VT1, 11, 21‧‧‧ first video transmission device

VT2, 12, 22‧‧‧second video transmission device

VT3, 13‧‧‧ third video transmission device

IN1~IN2, 14, 24A~24D‧‧‧ video input device

DIS1~DIS2, 15, 25‧‧‧ video output device

5, 10, 20‧‧‧ control module

110, 210, 220‧‧‧ processing modules

CS‧‧‧Communication Control Signal

VS, VS1~VS4‧‧‧ video signals

CMD‧‧‧ control order

CB1~CB3‧‧‧ connection line

113, 115~117, 123~127, 133~137, 221~222, N1~N4, K1~K4‧‧‧ video transmission interface

T0~t9, t2'~t3'‧‧‧ time

F1~F3‧‧‧Control

N1'~N4', K1'~K4', 221'‧‧‧ video data transmission channel

114‧‧‧Control command transmission interface

113', 115'~117'‧‧‧ first video data transmission channel

123'~127'‧‧‧Second video data transmission channel

133'~137'‧‧‧ Third video data transmission channel

1A and 1B are schematic diagrams showing different video transmission mechanisms between conventional video transmission devices.

2 is a functional block diagram showing an embodiment of a video channel control system in accordance with a first preferred embodiment of the present invention.

Figure 3 is a detailed schematic diagram of the video channel control system in Figure 2.

4A, 4B, and 4C are timing diagrams showing the functions of the first video transmission device, the second video transmission device, and the third video transmission device for performing analog video switches on analog video signals.

4D, 4E, and 4F are timing diagrams showing functions of the first video transmission device, the second video transmission device, and the third video transmission device for performing a video splitter on the digital video signal.

Figure 5 is a functional block diagram showing another embodiment of a video channel control system.

Figure 6 is a detailed schematic diagram of the video channel control system in Figure 5.

Figure 7 is a schematic diagram showing another embodiment of a video channel control system.

Figure 8 is a flow chart showing a method of controlling a video channel in accordance with a second preferred embodiment of the present invention.

1‧‧‧Video Channel Control System

11‧‧‧First video transmission device

12‧‧‧Second video transmission device

13‧‧‧ Third video transmission device

14‧‧‧Video input device

15‧‧‧Video output device

10‧‧‧Control Module

110‧‧‧Processing module

CS‧‧‧Communication Control Signal

VS‧‧‧ video signal

CMD‧‧‧ control order

113, 115~117‧‧‧ first video data transmission channel

123~127‧‧‧Second video data transmission channel

133~137‧‧‧ Third video data transmission channel

Claims (15)

A video channel control system includes: a control module for providing a communication control signal, wherein the communication control signal includes a control information; a first video transmission device coupled to the control module and receiving the The first video transmission device includes: a plurality of video transmission interfaces for transmitting digital video signals or analog video signals, comprising a plurality of first video data transmission channels; and a processing module coupled to the plurality of video transmission interfaces a first video data transmission channel for generating a control command according to the communication control signal, wherein the first video transmission device outputs the control command through one of the first video data transmission channels according to the control information; The second video transmission device is coupled to the first video transmission device for transmitting a digital video signal or an analog video signal. The second video transmission device includes at least one second video data transmission channel and transmits the second video data transmission channel. Receiving, by the first video transmission device, the control command; wherein the video transmission media Is based video graphics array (Video Graphics Array, VGA) transmission interface, digital video interface (Digital Video Interface, DVI) or High Definition Multimedia Interface (High Definition Multimedia Interface, HDMI). The video channel control system of claim 1, wherein the first or second video data transmission channels are Display Data Channel (DDC), Red Green Blue (RGB) channel, and minimized. Transition-Minimized Differential Signaling (TMDS) channel, Consumer Electronics Control (CEC) channel, or horizontal and vertical (HV) channel. The video channel control system of claim 1, wherein the first video transmission device is coupled to the second video transmission device via the first video data transmission channel and the second video data transmission channel. The control command is transmitted by the communication between the second video transmission device and the first video transmission device. The video channel control system of claim 1, wherein when the second video transmission device receives the control command, the second video transmission device transmits the digital video signal or the analog video signal according to the control command. , Switch Port, Power Control, Reset, Status Read, Version Identification, or Button Control. The video channel control system of claim 1, further comprising: a third video transmission device coupled to the second video transmission device for transmitting a digital video signal or an analog video signal, the third video transmission The device includes at least one third video data transmission channel, and receives the control command from the second video transmission device through the third video data transmission channel. The video channel control system of claim 5, wherein when the second video transmission device receives the control command, the second video transmission device outputs a digital video signal or an analog video signal to the control command. Third video transmission device. The video channel control system of claim 5, wherein the second video transmission device is coupled to the third video transmission device via the second video data transmission channel and the third video data transmission channel to perform the The control command is transmitted by the communication between the third video transmission device and the second video transmission device. The video channel control system of claim 1, wherein the control command is an Inter-Integrated Circuit (I ² C) communication bus signal, a universal asynchronous transmitter (Universal Asynchronous Receiver/Transmitter). , UART) signal or Universal Serial Bus (USB) signal. The video channel control system of claim 1, wherein the control module outputs the communication control signal through a Universal Asynchronous Receiver/Transmitter (UART) transmission interface, an RS232 transmission interface, or a USB transmission interface. To the first video transmission device. The video channel control system of claim 1, wherein the first video transmission device is a matrix video switch (Matrix Video Switch), a video switcher (Switch) or a video splitter (Splitter), and The second video transmission device is a video compensator (Booster), a matrix video switcher, a video switcher or a video distributor. A video channel control method is applied to at least a plurality of first video data transmission channels of a first video transmission device and at least one second video data transmission channel of a second video transmission device, where the video channel control method includes the following Step: (a) providing a communication control signal, wherein the communication control signal includes a control information; (b) generating a control command based on the communication control signal; and (c) transmitting the first video data transmission channel according to the control information One of the outputting the control command; and (d) receiving the control command from the first video data transmission channel through the second video data transmission channel; wherein the control information included in the communication control signal is for transmitting a video signal a destination information, or the user wants the first video transmission device or the second The function performed by the video transmission device. The video channel control method of claim 11, further comprising the step of coupling the first video transmission device and the second video transmission channel through the first video data transmission channel and the second video data transmission channel And a device for performing communication communication between the second video transmission device and the first video transmission device. The video channel control method of claim 11, wherein after the step (d), the video channel control method further comprises the step of: processing the video signal according to the control command and outputting to a video output device. The video channel control method according to claim 11 is also applied to at least one third video data transmission channel of a third video transmission device. After step (d), the video channel control method further includes the following Step: receiving the control command from the second video data transmission channel through the third video data transmission channel. The video channel control method of claim 14, further comprising the step of coupling the third video transmission device and the second video transmission device through the second video data transmission channel and the third video data transmission channel The communication between the third video transmission device and the second video transmission device is performed.