Multi-Speaker Equalization Using Acoustic Reflection Feedback
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Solution Overview
Problem
Existing audio playback systems require manual adjustment of equalization based on environment, which is often overlooked, requires a separate microphone, and does not adapt well to changes in speaker positions, limiting the dynamic adjustment of audio settings.
Innovation Solution
A playback device with a microphone and processor that emits an audio signal, detects reflections, determines environmental characteristics, and adjusts equalization settings automatically to optimize audio output based on the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of equalization is implemented, then audio settings can be customized for different environments, but user convenience deteriorates because manual adjustment is often overlooked and requires user intervention
Solution Approach 1:
The playback device automatically performs equalization adjustment by detecting acoustic reflections in the environment, eliminating the need for manual user intervention. The system serves itself by autonomously analyzing the acoustic characteristics and modifying audio output accordingly.
Solution Approach 2:
The system uses the playback device's microphone to detect acoustic reflections from the environment, creating a feedback loop where the output audio signal is analyzed and used to automatically adjust equalization settings based on the detected acoustic characteristics.
2Difficulty of detecting and measuring
If a separate microphone is used for detection, then environmental detection capability is improved, but device complexity increases due to additional components
Solution Approach 1:
The playback device's built-in microphone, originally intended for other functions, is repurposed to detect acoustic reflections for equalization adjustment. This eliminates the need for a separate dedicated microphone while maintaining environmental detection capability.
Solution Approach 2:
The detection function is merged with the existing playback device components, combining the microphone and processor already present in the device to perform both audio playback and environmental acoustic analysis without adding separate dedicated hardware.
3Device complexity
If fixed equalization settings are used, then device simplicity is maintained, but adaptability to different speaker positions and environments deteriorates
Solution Approach 1:
The equalization settings transition from fixed to dynamic, allowing the system to automatically adapt to different acoustic environments and speaker positions. The processor continuously analyzes acoustic reflections and adjusts equalization parameters in real-time based on environmental conditions.
Solution Approach 2:
The system changes equalization parameters automatically based on detected acoustic characteristics, adjusting frequency response and other audio parameters to optimize sound quality for different environments and speaker placements without requiring manual intervention.
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
Improves the listening experience by dynamically adjusting audio settings to suit the environment, reducing the need for manual intervention and ensuring consistent sound quality across different locations.
Implementation Method 1
detecting, by the playback device, a second audio signal, wherein at least a portion of the second audio signal is a reflection of the first audio signal
Data Source
AI summary
Techniques described herein may involve dynamically adjusting the equalization of multiple speakers in a playback device. An example implementation involves a playback device emitting, via a first speaker, a first audio signal and emitting, via a second speaker, a second audio signal. The playback device may detect, via a microphone, an audio signal representing (i) at least a portion of the first audio signal and (ii) at least a portion of the second audio signal. The implementation may further involve the playback device determining one or more reflection characteristics based on the detected audio signal. The example implementation may also involve identifying a first audio setting and a second audio setting based on one or more reflection characteristics and applying (i) the first audio setting to playback of media content via the first speaker and (ii) the second audio setting to playback of media content via the second speaker.