Statistical Multiplexer for ATSC Digital TV Datastream Packing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing transmitter network for digital-television signals based on the ATSC standard is inefficient in loading the transmission channel due to varying data rates of mobile-digital television signals, which are dependent on image content, leading to unnecessary peak data rate reservations.
Innovation Solution
A method is introduced to determine a cycle time for each datastream, distributing data units into sequences with reserved positions for both stationary and mobile digital television signals, allowing for efficient data packing and transmission, using statistical multiplexing to create a common datastream that adapts to time-variable demands, and utilizing burst signals to optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum data rate is reserved at the output of the coder for mobile-digital television, then the transmission channel can handle peak demands, but the transmission channel is loaded inefficiently due to unused capacity during low-demand periods
Solution Approach 1:
The patent implements dynamic data rate allocation where the transmission channel capacity is adjusted in real-time based on actual image content requirements. Instead of reserving a fixed maximum data rate, the system dynamically allocates bandwidth to match the varying complexity of video content, thereby improving transmission efficiency while maintaining reliability when needed.
Solution Approach 2:
The system changes the data rate parameter dynamically based on image content analysis. By monitoring video complexity metrics and adjusting the data rate accordingly, the transmission channel adapts its capacity to match actual demands, resolving the contradiction between maintaining sufficient capacity and achieving efficient utilization.
2Adaptability or versatility
If separate datastreams are maintained for stationary and mobile digital television, then both can be transmitted independently, but the transmission channel loading becomes inefficient due to duplicate peak rate reservations
Solution Approach 1:
The patent merges the datastreams for stationary and mobile digital television into a unified transmission format. By combining these separate streams and applying joint optimization, the system eliminates redundant peak rate reservations while maintaining the ability to serve both device types independently, thereby improving overall channel utilization.
Solution Approach 2:
The patent creates a universal datastream structure that can serve both stationary and mobile digital television requirements simultaneously. This multi-functional approach allows a single transmission channel to efficiently support multiple device types without requiring separate optimized streams, resolving the contradiction between adaptability and efficiency.
Data Source
AI summary
A method and a device for forming a common transport datastream from several mobile-digital television signal datastreams and a common stationary-digital television signal datastream. A constant number of data units of respectively-constant size in every successive time interval with constant cycle duration for the transmission of every individual datastream is determined. A data structure is specified for the common datastream with successive sequences in each case of a constant number of data units with respectively-identical positions for data units of the stationary-digital television signal and respectively-identical positions for data units of the mobile-digital television signal. Data units of each of the datastreams of the mobile-digital television signal are transmitted in each case in associated, identical positions of at least one successive sequence, and define the individual positions of the data structure of the common datastream with data units of the respectively associated datastreams.