Video transmission method and system capable of adaptively adjusting bandwidth
A video transmission system and adaptive adjustment technology, applied in the field of video transmission, can solve problems such as poor experience, inability to play video data on 4K display devices, and inability to play video signals on 4K display devices, etc., to achieve a good experience effect
Active Publication Date: 2021-05-11
REALTEK SEMICON CORP
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Problems solved by technology
However, when the conversion device is connected to two 4K display devices at the same time, since the bandwidth required by the two 4K display devices to display video data is already greater than the maximum bandwidth that can be carried by the Display Port (DP) interface between the video source and the conversion device, Only the video data of one 4K display device can be transmitted, but the video data cannot be played by two 4K display devices at the same time
[0004] If USB 3.0 is used for transmission between the video source and the conversion device, since the USB3.0 signal and DP signal will be transmitted at the same time, it is impossible for a 4K display device to play the video signal normally
To overcome this problem, when the conversion device chooses to transmit USB3.0 signals, it can only transmit video signals less than 4K to the display device. When not transmitting USB3.0 signals, the video source can transmit a 4K video signal and match the bandwidth. Video signals smaller than 4K are sent to display devices, resulting in poor experience for users on display devices with 4K ultra-high-definition quality
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[0023] figure 1 For a general display port (DP) interface link diagram, see figure 1 As shown, a DisplayPort source device 1 is connected to a DisplayPort sink device 2 through three groups of channels, and the three groups of channels include a main channel 3 , an auxiliary channel 4 and a detection channel 5 . The main channel 3 is used to transmit the video signal of the DisplayPort source device 1 to the physical line of the DisplayPort sink device 2. It has 4 pairs of differential signal lines. The 4 pairs of differential signal lines can be used according to the communication of the auxiliary channel 4. Differential signal lines are used to transmit video signals. There are three options: 1 pair, 2 pairs, and 4 pairs of differential signal lines. Different options will have different total bandwidths. The auxiliary channel 4 is used for controlling and exchanging information data between the DisplayPort source device 1 and the DisplayPort sink device 2. It is a bidirect...
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The invention provides a video transmission method and system capable of adaptively adjusting bandwidth. The video transmission method comprises the following steps of: acquiring a first display time sequence setting parameter of at least one display equipment; calculating the total transmission bandwidth of the at least one display equipment according to the first display time sequence setting parameter, and when the total transmission bandwidth is larger than the maximum transmission bandwidth between the video source end and a conversion device, generating a second display time sequence setting parameter with a smaller bandwidth corresponding to the first display time sequence setting parameter; transmitting a video signal conforming to the second display time sequence setting parameter to the conversion device bythe video source end according to the second display time sequence setting parameter; converting the second display time sequence setting parameter of the video signal back to the first display time sequence setting parameter by the conversion device. and transmitting the video signal conforming to the first display time sequence setting parameter to the corresponding display equipment.
Description
technical field [0001] The invention relates to a video transmission technology, in particular to a video transmission method and system for adaptively adjusting bandwidth. Background technique [0002] When a video source wants to transmit video data to multiple display devices, the video source will be connected to multiple display devices through hubs, USB Type-C docks or signal converters. display devices to display their respective video materials on the display devices. [0003] Before transmitting the video data, the conversion device transmits the bandwidth information obtained from the display device to the video source, and the video source allocates an appropriate video stream to each display device according to the bandwidth of the entire topology. However, when the conversion device is connected to two 4K display devices at the same time, since the bandwidth required by the two 4K display devices to display video data is already greater than the maximum bandwid...
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IPC IPC(8): H04N5/268H04N5/765H04N5/917
CPCH04N5/268H04N5/765H04N5/917H04N21/43635H04N21/4402G09G2350/00G09G5/12G09G2370/042G09G2370/12H04N7/12H04N7/01
Inventor 赵月城吴承华魏嘉良吴政鸿
Owner REALTEK SEMICON CORP