Adaptive HDMI Video Transmission for Bit Rate and Codec Compatibility
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Solution Overview
Problem
Current video signal transmission systems face limitations in transmitting non-compressed video signals with resolutions exceeding 1920x1080, as they exceed the maximum transmission bit rate, and existing methods either fail to detect compatible communication modes or do not handle non-compressed signals effectively, leading to compatibility issues and suboptimal transmission quality.
Innovation Solution
A video signal transmitting device that dynamically adjusts the bit rate by selectively transmitting non-compressed or compressed video signals based on the receiving device's capabilities and the transmission path state, using a compression method obtainable from the receiving device, and adjusts the bit rate to match the actual transmission path conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-compressed video signal transmission is used to maintain high video quality, then video quality is improved, but transmission bit rate exceeds the maximum capacity of the transmission path
Solution Approach 1:
The system dynamically switches between non-compressed and compressed video signal transmission modes based on real-time transmission path conditions. The transmitting device determines whether to output non-compressed or compressed video signals by monitoring transmission path state, allowing the system to adapt to varying bandwidth capacities and maintain optimal video quality within available transmission limits
Solution Approach 2:
The invention changes the compression parameter state by switching between non-compressed mode (no compression applied) and compressed mode (compression applied) based on transmission path conditions. This parameter change allows the system to adjust the bit rate of the video signal to match the maximum transmission bit rate capacity of the transmission path while maintaining the highest possible video quality
2Quantity of substance
If video compression is applied to reduce bit rate, then transmission bit rate is reduced to fit path capacity, but compatibility issues arise when receiving device cannot handle the compression method
Solution Approach 1:
The system employs feedback mechanisms where the transmitting device receives information from the receiving device about its compression handling capabilities. Based on this feedback, the transmitting device determines the appropriate compression method or decides to transmit non-compressed signals, ensuring compatibility between the transmitted video signal and the receiving device's processing capabilities
Solution Approach 2:
The transmitting device is designed to output both non-compressed and compressed video signals, making it universally compatible with different receiving device types. The device can adapt its output format based on the receiving device's capabilities, ensuring broad compatibility across different hardware configurations and compression method support levels
3Productivity
If transmission path state is monitored to optimize bit rate, then transmission efficiency is improved, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The transmitting device autonomously monitors its own transmission path state and automatically adjusts its video signal output accordingly. The device determines whether to output non-compressed or compressed video signals based on real-time transmission conditions without requiring external intervention, improving transmission efficiency while keeping control mechanisms integrated within the device itself
Data Source
AI summary
ObjectTo transmit well a video signal of a desired bit rate within a transfer bit rate of a transfer path.Solving MeansA control unit 111 controls the operation of data compression units 121-1 through 121-n and switch unit 122. When the bit rate BR of a non-compressed video signal output from a codec 117 is within the transfer bit rate BR2 of an HDMI transfer path, the control unit 111 supplies the non-compressed video signal output from the codec 117 to the HDMI transmitting unit 102 as a video signal to be transmitted. On the other hand, when the bit rate BR1 is greater than the bit rate BR2, the control unit 111 selects a compression method that can be handled on the receiving side performs compression processing so that the bit rate BR1 becomes lower than the bit rate BR2, and supplies the compression video signal to the HDMI transmitting unit 102 as a video signal to be transmitted. Also, the control unit 111 transmits compression information (control information of the switch unit 122 and data compression units 121-1 through 121-n).