Mode Transition Signaling via Control Link
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Solution Overview
Problem
Conventional data transmission systems experience delays and improper data presentation when transitioning between modes, such as from video modes like HDMI to HDMI-m, due to the lack of efficient signaling mechanisms for mode changes, leading to incompatible data handling and potential decryption issues.
Innovation Solution
Implementing a method that uses a single-wire control link for signaling mode changes by sending a warning message from the transmitter to the receiver before the mode transition, utilizing a high-bandwidth control channel like HDMI-m's Control Bus, allowing the receiver to prepare for the change and maintain a stable encrypted stream through a bridge device if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the receiving device detects mode change from the data stream itself, then the device can automatically adapt to the new mode, but there is a delay during which data is interpreted according to the wrong mode causing improper display or presentation
Solution Approach 1:
The patent applies preliminary action by sending a mode change notification message from the transmitting device to the receiving device before the actual mode transition occurs. This allows the receiving device to prepare its data interpretation logic in advance, so when the mode change happens, the receiving device is already ready to correctly interpret the new mode data without delay or improper display.
2Adaptability or versatility
If the data stream is changed from first mode to second mode without prior notification, then the transmitting device can change modes freely, but the receiving device interprets data incorrectly until it detects and switches modes
Solution Approach 1:
The patent implements feedback by having the transmitting device send a notification message to the receiving device about the upcoming mode change. This feedback mechanism ensures that the receiving device is informed in advance and can adjust its data interpretation accordingly, maintaining reliability during mode transitions while preserving the flexibility to change modes as needed.
3Reliability
If a control link is added for mode change signaling, then mode transitions can be coordinated properly, but the system complexity increases with additional communication channels
Solution Approach 1:
The patent applies universality by using an existing control link or data interface that can serve multiple functions - both normal data transmission and mode change signaling. This approach maintains reliable mode transition coordination while avoiding the need for entirely separate dedicated control channels, thereby limiting the increase in system complexity.
Data Source
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AI summary
Embodiments of the invention are generally directed to signaling for transitions between modes (D1, D2) of data transmission. An embodiment of a method includes transmitting a data stream over a data link (440) from a first device (410) to a second device (420), the data stream operating in a first mode (D1); determining that the data stream is to be changed from the first mode (D1) to a second mode (D2); and transmitting a message (Cmd 452) from the first device (410) to the second device (420) over a control link (450), the message (452) indicating that the first device will change the data stream from the first mode (Dl) to the second mode (D2), the message being sent prior to the change to the second mode.