3G-SDI Horizontal Auxiliary Space Audio Multiplexing
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Solution Overview
Problem
The current 3G-SDI standard limits audio multiplexing to 16 channels for 48 kHz sampling audio and 8 channels for 96 kHz sampling audio in Level A, making it difficult to multiplex multi-channel audio with video data, and incompatible with dual link 292 and 3G-SDI Level B standards.
Innovation Solution
The solution involves detecting synchronous data and extracting a reference clock from parallel data to control timing for multiplexing audio and video data in the horizontal auxiliary data space of the video data, allowing for increased audio multiplexing channels compatible with Level A of the 3G-SDI format, thereby enhancing compatibility with dual link 292 and 3G-SDI Level B.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio data is multiplexed according to SMPTE299M in 3G-SDI Level A, then the standard compliance is maintained, but the maximum number of multiplexes is limited to 16 channels for 48 kHz sampling audio
Solution Approach 1:
The patent utilizes the horizontal auxiliary data space, which is traditionally unused or underutilized in video data streams, to multiplex audio data. This dimensional approach allows audio channels to be embedded within the video stream's horizontal blanking period, effectively increasing the capacity from 16 to 32 channels for 48 kHz sampling audio while maintaining 3G-SDI Level A compliance.
Solution Approach 2:
The patent embeds audio data packets within the horizontal auxiliary data space of the video stream structure. By nesting audio information inside the existing video transmission framework, the system achieves increased multiplexing capacity without requiring a separate audio transmission channel, thus resolving the contradiction between standard compliance and channel capacity.
2Quantity of substance
If dual link 292 or 3G-SDI Level B is used to increase audio multiplexing channels, then the number of multiplexes increases to 32 channels for 48 kHz sampling audio, but compatibility with 3G-SDI Level A is lost
Solution Approach 1:
The patent creates a universal audio multiplexing solution that works within 3G-SDI Level A framework while achieving the channel capacity of dual link 292 or Level B. By utilizing the horizontal auxiliary data space, the invention makes the single link Level A as versatile as multi-link configurations, allowing 32 channels of 48 kHz audio without sacrificing Level A compatibility.
3Quantity of substance
If the horizontal auxiliary data space is utilized for audio multiplexing, then the number of audio channels increases, but the device complexity increases due to timing control requirements
Solution Approach 1:
The patent employs synchronous data and reference clock extraction from the parallel data to automatically control the timing of audio data multiplexing. The system uses embedded synchronization information within the video stream itself to manage audio insertion timing, eliminating the need for external complex timing control mechanisms and reducing overall device complexity.
Data Source
AI summary
A signal transmitting device includes: a synchronous-data detecting unit that detects, from parallel data specified by a predetermined format and including video data and audio data, synchronous data for controlling synchronization of the parallel data; an audio extracting unit that stores the audio data in an audio memory; a clock extracting unit that extracts a reference clock from the parallel data; a multiplexing unit that multiplexes the audio data and the synchronous data in a horizontal auxiliary data space of the video data; a control unit that controls, on the basis of the synchronous data and the reference clock, timing of the multiplexing unit for multiplexing the audio data with the video data; and a parallel serial converting unit that converts the video data multiplexed with the audio data by the multiplexing unit into a transmission stream specified by a Level A of a 3G-SDI format.