Playback Device Calibration for Multi-Zone Audio Synchronization
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Solution Overview
Problem
Existing audio systems struggle to optimize playback in multiple listening zones within a room or area, leading to suboptimal listening experiences due to variations in acoustic behavior, with current solutions lacking efficient methods for calibrating playback devices to ensure synchronized and echo-free audio across zones.
Innovation Solution
A system comprising playback devices, microphones, and signal processors that detect audio content, modulate it with a specific frequency, and process it to determine optimal equalization settings for each device, allowing for real-time adjustments to enhance audio quality and synchronization across zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If playback devices are used in multiple listening zones, then audio coverage area is increased, but acoustic consistency deteriorates due to variations in acoustic behavior across zones
Solution Approach 1:
The system applies local equalization adjustments to each playback device based on its specific acoustic environment. Microphones in each zone capture local acoustic characteristics, and the system processes these signals to determine zone-specific equalization settings that compensate for variations in acoustic behavior across different listening zones.
2Device complexity
If playback devices operate independently in different zones, then system complexity is reduced, but audio synchronization deteriorates leading to echoes and glitches
Solution Approach 1:
The system uses microphones to capture audio signals from each zone and feeds these signals back to a processing unit. The processing unit analyzes the captured signals to determine equalization settings and synchronization parameters, then adjusts each playback device accordingly. This feedback loop ensures that audio remains synchronized across zones while compensating for acoustic variations.
3Manufacturing precision
If real-time audio detection and processing is implemented, then audio quality optimization is improved, but processing time and computational resources increase
Solution Approach 1:
The system performs preliminary acoustic measurements in each zone using microphones to characterize the acoustic environment. Based on these preliminary measurements, the system pre-calculates equalization settings for each playback device. These pre-determined settings are then applied, reducing the need for continuous real-time processing while maintaining optimized audio quality.
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 across multiple zones, enriching the listening experience by minimizing echoes and ensuring consistent audio quality, allowing users to enjoy synchronized audio in various environments without noticeable glitches.
Implementation Method 1
a microphone configured to detect the rendered audio content
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 one or more playback devices. An example implementation involves a playback device playing back audio content using a first calibration via the one or more audio transducers and the one or more amplifiers. The first calibration is based on a response of a listening environment to audio content playback by the playback device. The playback device records, via one or more microphones, at least a portion of the played back audio content. Based on the recorded audio content, the playback device detects a change in the response of the listening environment to audio content playback by the playback device. Responsive to detecting the change in the response, the playback device causes output of a prompt to initiate a calibration procedure for the playback device. The calibration procedure involves a mobile device recording playback by the playback device.