Multi-Device Audio Calibration for Synchronized Zone Playback
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Solution Overview
Problem
Existing audio systems struggle to optimize playback in multiple listening zones within a room or environment, leading to suboptimal listening experiences due to variations in acoustic behavior, resulting in echoes, glitches, and inconsistent sound quality.
Innovation Solution
A system comprising a playback device, a microphone, and a signal processor that modulates and demodulates audio content to determine optimal equalization settings for each playback device based on detected audio signals, ensuring synchronized and enhanced audio playback across zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio content is played back across multiple zones simultaneously, then accessibility and social sharing of audio content is improved, but acoustic variations between zones cause echoes, glitches, and inconsistent sound quality
Solution Approach 1:
The system applies local quality by determining zone-specific equalization settings for each playback zone based on its unique acoustic characteristics. The processor analyzes audio content from each zone's microphone and applies tailored equalization adjustments, allowing each zone to have optimized sound quality adapted to its specific acoustic environment rather than using uniform settings across all zones.
2Reliability
If equalization settings are adjusted for each playback device to optimize acoustic behavior, then sound quality consistency is improved, but system complexity increases due to multiple detection and processing requirements
Solution Approach 1:
The system implements self-service by automatically determining equalization settings through autonomous acoustic analysis. Each playback zone's microphone detects the acoustic environment, the processor automatically analyzes these detections to determine zone-specific equalization settings, and the system applies these settings without requiring manual calibration or complex user intervention, thereby reducing operational complexity despite the sophisticated processing involved.
Solution Approach 2:
The system uses feedback by continuously monitoring acoustic conditions in each zone through microphones and automatically adjusting equalization settings based on detected acoustic behavior. The processor receives audio content from microphones, analyzes the acoustic characteristics, and applies equalization adjustments that feedback into the playback system, creating a closed-loop control mechanism that optimizes sound quality dynamically.
3Measurement precision
If acoustic behavior is detected and analyzed for each zone, then optimal equalization settings are achieved, but processing time and computational resources increase
Solution Approach 1:
The system applies preliminary action by determining equalization settings in advance for each playback zone before actual audio playback begins. The processor analyzes acoustic conditions and establishes zone-specific equalization profiles beforehand, so that when music is played across multiple zones, the optimized settings are already in place, eliminating the need for real-time adjustment during playback and reducing perceived processing time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides optimized audio playback by adjusting equalization settings for each playback device, enriching the listening experience by minimizing echoes and glitches, and ensuring consistent sound quality across multiple zones.
Implementation Method 1
a microphone configured to detect the rendered audio content from a first location relative to the at least one playback device
Implementation Method 2
a signal processor configured to modulate the detected audio content with a modulation signal having a modulation frequency
Data Source
AI summary
Example techniques involve calibration of multiple playback devices. An example implementation receives, via a user interface of the network device, an input to initiate calibration of a group of playback devices comprising a first playback device and a second playback device configured to playback audio content in synchrony. After initiating the calibration of the group of playback devices, the implementation detects audio content rendered synchronously by the first playback device and the second playback device. Based on the detected audio content, the implementation determines a first equalization adjustment for the first playback device and a second equalization for the second playback device and causes the first playback device to apply the first equalization adjustment and the second playback device to apply the second equalization adjustment when the first playback device and the second playback device play audio content synchronously as part of the group of playback devices.