Video Transmission Rate Adaptive System Based on Feedback Mechanism

Abstract

The invention discloses a video transmission rate self-adaption system based on a feedback mechanism. The system comprises a video transmitting device, a video receiving device and a transmission cable. The transmission cable comprises a forward transmission passageway and a backward control passageway. Serial data are sent the video receiving device from the video transmitting device through the forward transmission passageway. Backward control data are sent to the video transmitting device from the video receiving device through the backward control passageway. The system has the rate negotiation mode and the data transmission mode. In the rate negotiation mode, the system determines the transmitting rate and the receiving rate according to feedback information. In the data transmission mode, the video transmitting device configures the video compression ratio in a self-adaption mode according to the rate negotiation result and the video source code rate.

Description

technical field [0001] The present invention relates to a video transmission rate adaptive system based on a feedback mechanism, in particular to a video transmission device that uses a reverse control channel in a transmission cable to transmit feedback information from a video receiving device to a video sending device to adaptively determine the video transmission rate. speed technology. Background technique [0002] At present, video transmission technology is divided into wireless transmission and wired transmission according to the signal transmission method. Wireless transmission uses radio waves to transmit video data, and wired transmission uses cables to transmit video data. Commonly used cables include optical fiber, coaxial cable, Twisted pair and special cable, although the wireless transmission technology has been developed rapidly, the technology is simpler to implement, the transmission is more efficient, and the cost is relatively low, but the medium of wire...

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Problems solved by technology

[0002] At present, video transmission technology is divided into wireless transmission and wired transmission according to the signal transmission method. Wireless transmission uses radio waves to transmit video data, and wired transmission uses cables to transmit video data. Commonly used cables include optical fiber, coaxial cable, Twisted pair and special cable, although the wireless transmission technology has been developed rapidly, the technology is simpler to implement, the transmission is more efficient, and the cost is relatively low, but the medium of wireless transmission is electromagnetic waves, and the actual transmission is easily restricted by many conditions. Wired transmission not only has stable transmission and strong anti-interference ability, but also has high security and relatively fast transmission rate. From the actual use effect, the cost performance of wired transmission is much higher than that of wireless transmission, so it has been adopted on a large scale. However, due to the continuous development of high-definition camera technology in recent years, it has gradually become a trend to upgrade video resolution from standard definition to high-definition, followed by an exponential increase in data volume and transmission rate. In order to meet this trend, large and small Small manufacturers have launched various high-definition products and system solutions, among which IP high-definition transmission scheme and HD-SDI high-definition transmission scheme are two mainstream solutions, and they have their own advantages and disadvantages: IP high-definition transmits video data through After compressed and packaged, it is transmitted through the IP network, and the transmission distance is long, which can greatly improve the video data carrying capacity, has high scalability and extensibility, and at the same time, the cost is low when building a large-scale system. It is still based on the analog system. If it is upgraded from analog to IP high-definition system, it needs to invest a lot of manpower and material resources, and there are various difficulties such as re-wiring, re-investment in hardware resources, and personnel retraining; HD-SDI high-definition and IP high-definition are similar The biggest advantage is that the existing analog system can be smoothly upgraded to the high-definition system. The wiring and equipment management can continue to use the old analog system without rewiring. During the upgrade, only the hardware equipment needs to be replaced, and no additional investment and reinstallation are required. For training, but because HD-SDI transmits uncompressed high-definition video, it has high requirements on the transmission rate. For example, the serial transmission rate required by HD-SDI is 1.485Gb / s. If such a high signal rate Transmission on a coaxial cable, the transmission distance does not exceed 100 meters, which greatly limits the scope of use of the product. If long-distance transmission is required, relay equipment or conversion to optical media transmission equipment is required, which increases the cost virtually. Existing video transmission technologies, whether it is IP high-definition or HD-SDI high-definition solutions, have their own shortcomings. At present, there is a lack of wiring and equipment that can be compatible with existing analog systems, and can reduce video transmission rates through compression and extend video signal transmission. Distance Video Transmission Technology System

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