Audio Playback Calibration with Virtual Multi-Position Room Response
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Solution Overview
Problem
Existing media playback systems require physical detection of acoustic responses at multiple spatial locations within a room for calibration, which is inconvenient and time-consuming.
Innovation Solution
A method that determines a room response by applying a mapping to a microphone location response, using historical data to approximate the room response without physical detection at multiple locations, allowing for calibration of playback devices for improved listening experiences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical detection of acoustic responses at multiple spatial locations is performed for calibration, then measurement precision is improved, but loss of time and ease of operation deteriorate
Solution Approach 1:
The patent uses historical data from previously calibrated rooms to create a copy or approximation of the current room's acoustic response. Instead of physically measuring the room acoustics by moving a microphone to multiple locations, the system retrieves similar historical measurements and applies a mapping to approximate the current room's response, thereby avoiding time-consuming physical detection while maintaining sufficient measurement precision for calibration.
2Measurement precision
If physical detection of acoustic responses at multiple spatial locations is performed for calibration, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system creates a virtual copy of the calibration process by using historical data. Instead of requiring the user to physically move a microphone through multiple locations and manually perform detection operations, the system automatically retrieves and applies pre-computed historical acoustic responses through a mapping function, significantly simplifying the calibration operation while preserving measurement precision.
Solution Approach 2:
The patent introduces a mapping function as an intermediary between the microphone location response and the room response. This mapping acts as a mediator that translates easily obtainable microphone responses (at a single location) into accurate room responses (at multiple locations) without requiring the user to perform complex physical measurements, thus improving ease of operation while maintaining precision.
3Ease of operation
If historical mappings are used to approximate room response, then ease of operation and productivity are improved, but measurement precision may deteriorate
Solution Approach 1:
The patent applies parameter changes by using a mapping function that transforms the microphone location response into an approximated room response. The mapping function adjusts and transforms the acoustic parameters from the single-location microphone measurement to represent the multi-location room response characteristics, thereby maintaining measurement precision while achieving ease of operation through automated approximation based on historical data.
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.