AV Reproduction Device Capability Caching for Seamless Audio Switching
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Solution Overview
Problem
Conventional audio-video data reproduction methods experience interruptions when switching audio outputs due to HDCP authentication, resulting in temporary loss of content viewing during the re-authentication process.
Innovation Solution
An audio-video data reproduction system that includes an audio-video reproduction device, an audio output device, and an audio-video output device connected via a network, where the system inquires and transmits audio reproduction capability information using control messages to adjust audio formats without re-transmitting capability information during authentication, thereby preventing interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the audio reproduction capability information is re-transmitted during authentication switching, then the audio format can be adjusted to match the new output device, but the content playback is interrupted causing temporary loss of content viewing
Solution Approach 1:
The system performs preliminary actions by establishing the audio reproduction capability information exchange mechanism before authentication switching occurs. The audio reproduction device stores capability information of multiple output devices in advance, and when switching occurs, it can immediately retrieve and apply the stored information without interrupting content playback, thus resolving the contradiction between format adaptability and playback continuity
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that content playback continues uninterrupted during authentication switching. The audio reproduction device uses previously acquired capability information to maintain audio output while the authentication process occurs in the background, allowing the useful action of content delivery to continue without interruption despite the format adjustment needs
2Reliability
If the HPD signal is switched to trigger authentication, then the audio reproduction capability can be updated for the new device, but the authentication process causes content playback to stop
Solution Approach 1:
The system performs preliminary actions by acquiring and storing audio reproduction capability information of multiple output devices before authentication switching occurs. When the HPD signal indicates a new device connection, the system retrieves the pre-stored capability information and applies it immediately, avoiding the need to stop content playback for authentication while still ensuring reliable device capability matching
Solution Approach 2:
The patent introduces an intermediary mechanism where the audio reproduction device maintains a cache of capability information from multiple output devices. This intermediary storage allows the system to match device capabilities without requiring real-time authentication interruption, thus maintaining both reliability of capability matching and productivity of content delivery
3Adaptability or versatility
If the audio reproduction device reads the reproduction capability from the output device, then the audio format can be optimized for the specific device, but the unidirectional data connection requires re-authentication when devices change
Solution Approach 1:
The patent applies universality by enabling the audio reproduction device to store and manage capability information for multiple different output devices within a single system. This multi-functionality allows the device to adapt to various output devices (TVs, audio amplifiers, etc.) without requiring separate authentication processes for each, reducing the complexity of authentication management while maintaining audio format optimization for each specific device type
Solution Approach 2:
The system uses copying by creating and storing copies of reproduction capability information from multiple output devices in the audio reproduction device's memory. These copied capability records allow the system to optimize audio formats for different devices without requiring real-time reading or re-authentication, thus reducing authentication management complexity while maintaining adaptability
Data Source
AI summary
In the case where (i) audio-video data is unidirectionally transmitted between any device, where (ii) control messages are bidirectionally transmitted between all of the devices, and where (iii) a connection between the devices for transmitting and receiving the audio-video data becomes valid when unidirectional transmission of audio reproduction capability information of the reception device from the data reception device to the data transmission device becomes available, the TV (31) includes the audio reproduction capability information of the AV amplifier (21) to the control message and transmits the control message to the DVD recorder (10) (30M3), and in the case where the DVD recorder (10) and the TV (31) are connected such that the audio-video data is unidirectionally transmitted from the DVD recorder (10) to the TV (31), and where the TV (31) and the AV amplifier (21) are connected such that the audio data is output from the TV (31) to the AV amplifier (21) through another network, the TV (31) does not re-transmit the audio reproduction capability information to the DVD recorder (10) using the unidirectional transmission when transmitting the control message.