Portable Playback Device Off-Net Synchronization
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Solution Overview
Problem
Conventional portable playback devices are limited to standalone operation when away from their usual Wireless Local Area Network (WLAN), preventing synchronized audio playback in off-net locations such as beaches or parks.
Innovation Solution
The technology enables multiple portable playback devices to form temporary wireless networks or peer-to-peer links, allowing them to synchronize audio playback without a home WLAN, using system identifiers to automatically configure network settings and distribute clock timing for synchronized playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If portable playback devices operate away from home WLAN, then devices can be used in off-net locations, but synchronized playback between multiple devices is lost
Solution Approach 1:
The patent introduces a temporary wireless network as an intermediary communication channel between portable playback devices when they are away from the home WLAN. This temporary network acts as a mediator that enables devices to exchange synchronization data and maintain coordinated playback, thus resolving the contradiction between off-net operation capability and synchronized playback reliability
Solution Approach 2:
The system dynamically switches between using the home WLAN for synchronization and establishing a temporary wireless network when away from home. The synchronization mechanism adapts its communication path based on the operational context, allowing devices to maintain synchronized playback whether at home or in off-net locations by adjusting the network topology dynamically
2Reliability
If multiple portable devices form temporary wireless networks, then synchronized playback is enabled, but network configuration complexity increases
Solution Approach 1:
The patent implements automatic network configuration where portable playback devices autonomously establish temporary wireless networks and exchange synchronization parameters without user intervention. The devices self-organize the network topology, automatically negotiate communication protocols, and configure synchronization settings, thereby enabling synchronized playback while minimizing the perceived complexity for users
Solution Approach 2:
The system pre-configures synchronization parameters and network settings before devices need to operate in off-net locations. By preparing synchronization data and network configuration templates in advance, the system reduces the complexity of establishing temporary networks during actual playback scenarios, as devices can quickly deploy pre-prepared configuration sets
Data Source
AI summary
Disclosed embodiments include a portable playback device performing functions comprising: (i) after receiving an indication to operate in a playback group while the first portable playback device is connected to a network device via a Personal Area Network (PAN) and not connected to a first Wireless Local Area Network (WLAN), establishing a second WLAN for the playback group; and (ii) after a second portable playback device has joined the second WLAN operated by the first portable playback device, streaming audio content received via the PAN connection from the first network device to the second portable playback device via the second WLAN operated by the first portable playback device, and playing the audio content in a groupwise manner with the second portable playback device. Other embodiments include portable playback devices performing similar functions via a peer-to-peer wireless link rather than the second WLAN.