Playback Calibration State Sharing Across Audio Zones
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Solution Overview
Problem
Existing media playback systems face challenges in maintaining calibration across multiple devices and environments, leading to inconsistent audio quality due to changes in device configuration, location, and acoustics, which affects the listening experience.
Innovation Solution
The implementation of a calibration state variable that is stored and shared across devices within a media playback system, allowing for the maintenance of calibration status through power cycling, detection of changes, and automatic recalibration procedures, ensuring consistent audio performance across zones and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calibration is performed manually for each device and environment, then initial calibration accuracy can be achieved, but calibration consistency is lost across power cycles and environmental changes
Solution Approach 1:
The system performs calibration in advance and stores the calibration state variable persistently. When the device restarts or environment changes, the pre-stored calibration state is retrieved and applied automatically, eliminating the need for repeated manual calibration procedures.
Solution Approach 2:
The calibration state variable is copied and shared across multiple devices in the media playback system. This allows calibration information to be preserved and transferred between devices, maintaining calibration consistency even when individual devices are replaced or restarted.
2Reliability
If calibration state is not maintained across power cycles, then device simplicity is preserved, but audio quality consistency deteriorates after restart
Solution Approach 1:
The playback device automatically manages its own calibration state by persisting the calibration variable to non-volatile memory and retrieving it during startup. This self-service approach maintains audio quality consistency without requiring external intervention or complex multi-device coordination for calibration management.
Solution Approach 2:
The calibration state variable ensures continuous maintenance of calibration information across power cycles. By persisting the calibration state to non-volatile memory and automatically restoring it on startup, the system maintains uninterrupted calibration consistency without requiring repeated calibration actions.
3Adaptability or versatility
If calibration parameters are customized for each zone, then audio performance adaptability is improved, but system complexity increases
Solution Approach 1:
The calibration system is segmented into independent calibration state variables for each zone or playback device. This allows each zone to maintain its own customized calibration parameters while the overall system manages them through a standardized interface, reducing the complexity of managing zone-specific configurations.
Solution Approach 2:
The calibration state variable mechanism serves multiple functions: it persists calibration data across power cycles, shares calibration information between devices, and enables zone-specific optimization. This universal approach handles diverse calibration needs through a single coherent system rather than requiring separate management mechanisms for each function.
Data Source
AI summary
Example techniques involve a calibration state variable. An example implementation receives, via a network interface, an indication that the first playback device is calibrated. Based on receiving the indication that the first playback device is calibrated, the example implementation updates a calibration state variable to indicate that the first playback device is calibrated, wherein the calibration state variable is stored in the data storage. The example implementation sends, via the network interface, an indication of the updated calibration state variable to a second device.