Connected Subwoofer Volume Range Control for Multi-Zone Playback
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Solution Overview
Problem
Existing audio playback systems struggle to manage volume control across multiple listening zones simultaneously, often resulting in audible echoes or volume inconsistencies, especially in shared environments where different zones may have varying volume requirements or restrictions.
Innovation Solution
A system comprising zone players and controllers that allow for synchronized audio playback across multiple zones, with the ability to apply state variable updates for limited volume ranges and group volume adjustments, ensuring that playback volumes are adjusted within defined limits to prevent disturbance or optimize clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple zones play audio simultaneously with independent volume control, then individual zone audio quality is improved, but audible echoes and volume inconsistencies occur between zones
Solution Approach 1:
The patent merges volume control for multiple zones into a unified group volume control mechanism. When zones are grouped together, a single volume adjustment command is applied to all zones simultaneously, ensuring consistent volume levels across zones and preventing audible echoes caused by volume mismatches. This resolving the contradiction by sacrificing individual zone volume independence in favor of overall system coherence.
Solution Approach 2:
The system implements feedback mechanisms to detect and correct volume inconsistencies between zones. The controller monitors playback status and volume levels across zones, and automatically adjusts individual zone volumes or triggers group volume adjustments to maintain consistent audio levels, thereby eliminating audible echoes while preserving individual zone audio quality.
2Ease of operation
If group volume adjustment is applied to multiple playback devices, then operational simplicity is improved, but volume limitations of individual devices may be violated
Solution Approach 1:
The patent applies local quality by allowing different volume ranges for different playback devices based on their individual capabilities. Each device has its own volume limits stored in the system, and when a group volume adjustment is commanded, the controller individually clamps each device's volume to its specific limits while maintaining the relative volume relationships. This resolves the contradiction by preserving operational simplicity while ensuring each device operates within its reliable volume range.
Solution Approach 2:
The system dynamically adjusts group volume commands based on the capabilities of individual devices in the group. When applying volume changes, the controller evaluates the volume range of each device and modifies the adjustment amount accordingly, ensuring no device exceeds its limits. This dynamic adaptation maintains ease of operation while guaranteeing reliability across diverse device configurations.
3Stability of the object's composition
If individual zone playback is restricted to a single zone, then volume consistency is improved, but flexibility for multi-zone listening is reduced
Solution Approach 1:
The patent implements a universal volume control system that can operate in multiple modes: individual zone control, group volume control, and synchronized multi-zone playback. The same controller and playback system can adapt to different usage scenarios, providing volume consistency when needed and multi-zone flexibility when desired, thereby resolving the contradiction between stability and adaptability.
Solution Approach 2:
The system dynamically switches between different operational modes based on user input and system state. Users can configure zones to play individually or in groups, and the volume control mechanism adapts accordingly - applying individual volume control for single zones and group volume control for multi-zone scenarios. This dynamic behavior provides both volume consistency and multi-zone flexibility as needed.
Data Source
AI summary
Methods and systems are provided for volume interactions for connected playback devices. In an example implementation, a first playback device applies a state variable update associated with a group of playback devices comprising the first playback device and one or more second playback devices. The state variable update indicates a limited volume range associated with the first playback device. The first playback device renders audio content in synchrony with the one or more second playback devices. Rendering the audio content involves a subwoofer speaker of the first playback device rendering a bass frequency component of the audio content. The first playback device receives input data indicating a group volume adjustment for the group of playback devices and adjusting a playback volume of the first playback device based on the group volume adjustment and the limited volume range.