Audio Playback Calibration Using Historical Room Responses
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Solution Overview
Problem
Existing audio playback systems struggle to effectively calibrate audio output to account for the unique acoustics of individual rooms, requiring manual detection of audio content at multiple spatial locations within the room for accurate playback.
Innovation Solution
A method that uses a mapping between historical microphone location responses and room responses to approximate the room response without physically detecting audio at different spatial locations, allowing for calibration based on fixed microphone locations and historical data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual detection of audio content is performed at multiple spatial locations, then calibration accuracy is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent creates a virtual copy of the physical calibration process by using historical data from previous calibrations. Instead of physically measuring audio at multiple locations, the system copies the calibration process from historical records and applies it to the current situation, thereby achieving accurate calibration without the physical complexity of multi-location measurements
Solution Approach 2:
The patent introduces historical calibration data as an intermediary between the desired accurate calibration and the simplified single-location measurement process. This intermediary allows the system to infer room acoustic characteristics without directly measuring them at multiple positions, thus reducing operational complexity while maintaining accuracy
2Measurement precision
If manual detection at multiple spatial locations is required, then calibration precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables the calibration system to serve itself by automatically using historical data to perform calibration without requiring manual intervention at multiple locations. The system self-calibrates by retrieving and applying relevant historical calibration information, making the process simple for users while maintaining high precision
Solution Approach 2:
The patent performs preliminary calibration actions by pre-collecting and storing historical calibration data before the actual calibration event. This preliminary action allows the system to have ready-made reference information that simplifies the current calibration process while ensuring precision through established historical patterns
3Measurement precision
If physical detection of audio content is performed, then calibration accuracy is improved, but time consumption increases
Solution Approach 1:
The patent copies calibration results from historical data instead of performing new physical measurements. By retrieving and adapting historical calibration information, the system achieves accurate calibration results much faster than would require time-consuming multi-location audio detection
Solution Approach 2:
The patent performs the time-consuming calibration measurements in advance during initial system setup or previous calibrations, storing the results as historical data. This preliminary action eliminates the need for time-consuming measurements during subsequent calibrations, as the system can quickly retrieve and apply pre-computed calibration parameters
Data Source
AI summary
An audio playback device comprises a microphone, a speaker, and a processor. The processor is arranged to output by the speaker first audio content and receive by the microphone an indication of the first audio content. A first acoustic response of a room in which the audio playback device is located is determined based on the received indication of first audio content. A mapping is applied to the first acoustic response to determine a second acoustic response. The second acoustic response is indicative of an approximated acoustic response of the room at a spatial location different from a spatial location of the microphone. The second audio content output by the speaker is adjusted based on the second response.