SDI (Serial Digital Interface)-based bidirectional auxiliary data transmission method
An auxiliary data and data technology, applied in the direction of cable transmission adaptation, two-way working system, etc., can solve the problems of inability to transmit other useful data, cumbersome communication, etc., and achieve the effect of solving the cumbersome communication between the two parties
Active Publication Date: 2015-09-30
GUANGZHOU AVA ELECTRONICS TECH CO LTD
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[0004] In view of this, the present invention provides a method for transmitting bidirectional auxiliary data based on SDI to solve the technical problem that the current SDI transmission method cannot transmit other useful data and the communication between the two parties is cumbersome during long-distance transmission
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[0021] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if in fact more than one invention is disclosed The scope is any individual invention or inventive concept.
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The invention discloses an SDI (Serial Digital Interface)-based bidirectional auxiliary data transmission method. The SDI-based bidirectional auxiliary data transmission method comprises the steps of inserting downstream user data in an unused audio channel by a data MUX (Multiplexing) unit, packing the downstream user data into an audio data packet according to the standard of SDI embedded audio, and embedding the audio data packet together with audio data in a video line blanking zone; carrying out descrambling and decoding by a receiving end, separating video data, de-multiplexing the audio data, and extracting useful downstream user data in an assigned audio channel; receiving upstream user data sent by the receiving end through a coaxial cable by a sending end, and unpacking the upstream user data passed back by the receiving end. According to the SDI-based bidirectional auxiliary data transmission method disclosed by the invention, the limit that an existing SDI just can be used for simply transmitting audio and video is broken through, thus the problems of transmission simplicity of the existing SDI and intercommunication tediousness during long-distance transmission can be effectively solved, and bidirectional useful user data can also be transmitted in real time even if no video source signal transmission exists.
Description
technical field [0001] The invention relates to a method for transmitting control signals during audio and video signal transmission, in particular to a method for transmitting bidirectional auxiliary data based on SDI. Background technique [0002] As people's demand for digital consumption continues to increase, so does the demand for high-performance high-definition digital video. Among the many audio and video transmission methods, the serial digital interface (SDI, Serial Digital Interface) transmission method is widely used in security due to its advantages of uncompressed image without distortion, low delay, high definition, and long transmission distance. Broadcasting level, video conferencing and other industries. For example, compared to the high-definition multimedia interface (HDMI, High Definition Multimedia Interface) transmission method with a relatively short transmission distance, and the video graphics array (VGA, Video Graphics Array) transmission method ...
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Inventor 欧俊文
Owner GUANGZHOU AVA ELECTRONICS TECH CO LTD