Proximity-Based Playback Expansion for Synchronized Audio Zones
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Solution Overview
Problem
Existing media playback systems lack the ability to seamlessly expand playback of a media item from one device to another based on changes in proximity, limiting the flexibility and synchronization of audio playback across multiple zones.
Innovation Solution
A first playback device identifies a second playback device within its proximity and determines if it is playing a media item, then joins the second zone and begins playing the media item in synchrony, or transmits a command for the second device to join the first zone and play in synchrony, enabling automatic expansion of playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a media playback system uses fixed zone assignments for playback devices, then system stability and simplicity are maintained, but flexibility and adaptability when devices move are limited
Solution Approach 1:
The patent implements dynamic zone assignment where playback devices automatically join or leave zones based on their proximity to other devices. Instead of fixed zone assignments, the system continuously monitors device locations and automatically reconfigures zone memberships, allowing the zone structure to adapt dynamically as devices are moved throughout the environment.
Solution Approach 2:
The system enables automatic playback expansion without requiring manual user intervention. When a playback device detects another device within proximity, it automatically determines whether to expand playback to that device or join its zone, and executes the appropriate action. This self-service mechanism eliminates the need for users to manually configure zone assignments or trigger playback expansion.
2Extent of automation
If playback expansion is manually triggered, then system stability is maintained, but user convenience and automation are reduced
Solution Approach 1:
The system continuously monitors the proximity between playback devices and automatically triggers playback expansion when devices are detected within a predetermined distance. This feedback mechanism compares the current state (device locations) with the desired state (seamless multi-device playback) and automatically executes the appropriate action to bridge the gap, eliminating the need for manual user triggering.
Solution Approach 2:
The system performs preliminary detection of device proximity and pre-configures the conditions for playback expansion before actual playback occurs. By continuously monitoring device locations and pre-establishing proximity thresholds, the system is ready to automatically expand playback immediately when devices come within range, ensuring seamless transition without requiring user intervention at the moment of expansion.
3Area of stationary object
If playback is expanded to all devices in a zone, then audio coverage is maximized, but energy consumption and system resource usage increase
Solution Approach 1:
Instead of uniformly expanding playback to all devices in a zone, the system selectively expands playback only to devices that are within predetermined proximity of the source device. This local quality approach ensures that playback is distributed only where needed (near the source device) rather than throughout the entire zone, optimizing energy consumption by keeping only nearby devices active while maintaining adequate audio coverage in the immediate area.
Data Source
AI summary
Examples described herein involve expanding playback of a media item from a first playback device to a second playback device. In one example, while a first playback device is playing a media item as part of a first zone, the first playback device identifies that a second playback device has moved to a location that is within a given physical proximity of the first playback. The first playback device determines that playback is to be expanded to the second playback device, and transmits a command to cause the second playback device to (i) join the first zone and (ii) begin to play the media item in synchrony with the first playback device.