Multi-node net signal scheduling method based on SDI video and audio signals

Abstract

The invention relates to a multi-node net signal scheduling method based on SDI (Serial Digital Interface) video and audio signals, belongs to the technical field of video and audio signal processing, does not need to additionally add equipment, greatly reduces the cost, can improve the utilization rate of a built-in keying system of a switching station with low utilization rate at the current stage, and is convenient to manage. The detection and judgment of the frame synchronization process are further refined, so that misjudgment of the detection and judgment is avoided; in the pilot run stage of the scheme, the superiority of the scheme is reduced due to the misjudgment phenomenon for many times, so that the detailed verification link needs to be designed, and corresponding parameters need to be set according to historical data judged by the frame synchronization signal. Due to the existence of the program BUG for judging the frame synchronization signal, two independent operation units need to be designed, and misjudgment caused by the program BUG problem under the condition of extremely few programs can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of video and audio signal processing, and in particular relates to a multi-node net signal scheduling method based on SDI video and audio signals. Background technique [0002] The existing 4K SDI switching technology mainly adopts the distributed processing architecture of independent chips. With the further improvement of the demand for audio and video production, the demand for high IO quantity and higher definition (resolution) is brought; the distributed processing architecture of independent chips is in There are mainly the following problems when addressing the demand for high IO quantity and high resolution: it is necessary to geometrically increase the number of chips to meet the demand for high IO and high resolution, and the cost is too high. Independent chip distributed processing architecture, all chip functions are single and independent, without scalability, it is difficult to meet the emergin...

AI Technical Summary

Problems solved by technology

[0002] The existing 4K SDI switching technology mainly adopts the distributed processing architecture of independent chips. With the further improvement of the demand for audio and video production, the demand for high IO quantity and higher definition (resolution) is brought; the distributed processing architecture of independent chips is in There are mainly the following problems when addressing the demand for high IO quantity and high resolution: it is necessary to geometrically increase the number of chips to meet the demand for high IO and high resolution, and the cost is too high

Independent chip distributed processing architecture, all chip functions are single and independent, without scalability, it is difficult to meet the emerging needs of the market in a short time

That is to say, most of the hardware architecture products that schedule and process multiple 4K SDI signals adopt the independent chip distributed processing mode, the chip has a single function, and the scalability and usability are poor.

[0003] Specifically, under the traditional SDI signal scheduling switching mode architecture, each chip operates independently, and there is no problem with this architecture when the number of IOs is small and the bandwidth requirement is low; however, with the development of the video and audio industry, the demand for equipment is also increasing increase; the demand for dozens of channels of IO, the bandwidth pressure brought by 4K or even 8K-level resolution, if the distributed processing architecture of independent chips is still used, the demand for the number of chips will increase geometrically, and the resulting cost pressure, The pressure of PCB plate making technology and the pressure of equipment miniaturization are unacceptable

At the same time, in the case of multi-channel IO requirements, due to the inconsistency of signal sources, frame synchronization processing is required for all signals. If synchronization is not performed, the screen will be torn. Therefore, frame synchronization processing is required for all signals. After synchronization, the signals are all aligned with the blanking area according to the unified synchronization source to achieve the effect of accurate switching; the above frame synchronization process, in the independent chip distributed processing architecture, each signal needs to be realized through the Frame Buffer (frame buffer chip) , extremely inflexible and costly in the face of high IO demands

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