HD-SDI Signal Transmission Multiplexing Audio and Video
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Solution Overview
Problem
Current technologies face challenges in efficiently transferring high-definition image signals with a large number of pixels and synchronizing multi-channel audio signals, particularly with the UHDTV standard, as they require complex synchronization processing and are limited by the bit rate capacity of existing transfer methods.
Innovation Solution
The method involves dividing the high-definition image signal into subimages and mapping pixel samples onto two-channel HD-SDI signals, while synchronizing the audio signal with the image data by placing it in the horizontal ancillary data spaces of these signals, allowing for the multiplexing of multi-channel audio onto the transfer data stream without the need for complex synchronization across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-channel audio signals are transferred using separate transfer paths synchronized with divided image signals, then audio quality and channel capacity can be improved, but synchronization complexity and device complexity increase significantly
Solution Approach 1:
The patent combines audio signal transfer with image signal transfer by multiplexing audio data into the horizontal ancillary data spaces of HD-SDI transfer streams. Instead of using separate transfer paths for audio, the invention merges audio transmission into the existing image transfer infrastructure, thereby maintaining audio quality while eliminating complex synchronization requirements between separate audio and image transfer systems
Solution Approach 2:
The horizontal ancillary data space in HD-SDI transfer streams, originally designed for other purposes, is repurposed to carry multi-channel audio signals. This multi-functional use of existing data spaces allows the system to transfer both high-definition image signals and multi-channel audio signals through the same transfer path without requiring additional dedicated audio transfer infrastructure
2Quantity of substance
If the transfer bit rate is increased to accommodate UHDTV signals with more pixels, then data transfer capacity improves, but existing transfer methods become insufficient and require multiple channels
Solution Approach 1:
The patent utilizes the horizontal ancillary data space dimension within the existing HD-SDI transfer stream structure to accommodate additional audio data. By exploiting this underutilized dimension in the data stream format, the system can transfer UHDTV signals with high pixel counts while simultaneously carrying multi-channel audio without requiring proportional increases in the number of physical transfer channels
3Quantity of substance
If audio signals are multiplexed onto separate transfer channels, then audio channel capacity increases, but the synchronization process becomes more complex
Solution Approach 1:
The patent merges audio signal transfer with image signal transfer by embedding audio data within the horizontal ancillary data spaces of the same HD-SDI transfer stream that carries image data. This combination ensures that audio and image signals travel together through the same transfer path, automatically maintaining synchronization while increasing audio channel capacity
Solution Approach 2:
The horizontal ancillary data space acts as an intermediary carrier that facilitates the transfer of multi-channel audio signals within the existing HD-SDI framework. This intermediary structure allows audio data to be inserted and transferred without disrupting the primary image signal transfer, while maintaining natural synchronization between audio and image
Data Source
AI summary
When transmitting an input image signal and an audio signal inputted in synchronization with the input image signal, each frame in the input image signal are divided into first, second, third, and fourth subimages and pixel samples of the subimages are mapped onto image data regions of two-channel HD-SDI signals, respectively, and the audio signal is mapped onto supplementary data regions included in horizontal ancillary data spaces of any of the two-channel HD-SDI signals onto which the subimages are respectively mapped. The pixel samples mapped onto the image data regions of the two-channel HD-SDI signals are multiplexed onto an image data region of a first transfer data stream and the audio signal mapped onto the supplemental data regions included in horizontal ancillary data spaces of any of the two-channel HD-SDI signals is multiplexed onto a horizontal ancillary data space of a second transfer data stream.