Playback Device Calibration Validation Through Cross-Device Recording
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Solution Overview
Problem
The audio response of playback devices varies based on their positioning and orientation within a room, leading to inconsistent frequency, temporal, and spatial responses, which can be exacerbated by changes in the room's characteristics such as furniture or decor, rendering calibration settings ineffective.
Innovation Solution
A first playback device uses a microphone to record audio played by a second playback device, compares it to an expected audio response, and sends an indication if the calibration setting is invalid, prompting recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If playback devices are positioned and oriented within a room, then audio playback functionality is enabled, but audio response consistency deteriorates due to varying frequency, temporal, and spatial responses
Solution Approach 1:
The system performs preliminary calibration by playing test tones through the playback device and recording the audio response with a microphone before actual music playback. This preliminary measurement allows the system to pre-adjust equalization settings to compensate for room acoustics and device positioning, ensuring consistent audio response from the start.
Solution Approach 2:
The system continuously monitors audio response by playing test tones and recording with a microphone, then uses this feedback to dynamically adjust equalization settings. This closed-loop feedback mechanism maintains audio consistency even when room characteristics change due to furniture movement or other environmental factors.
2Measurement precision
If calibration settings are applied to compensate for room characteristics, then audio quality is improved, but calibration validity deteriorates when room characteristics change
Solution Approach 1:
The system periodically re-calibrates by playing test tones and measuring audio response at scheduled intervals or when triggered by user interaction. This periodic recalibration ensures that equalization settings remain valid even as room characteristics change over time due to furniture movement, decor changes, or seasonal variations.
Solution Approach 2:
The system provides visual feedback through icons indicating calibration status and prompts users to recalibrate when validity is compromised. This feedback mechanism informs users when the current calibration settings are no longer optimal, encouraging them to perform new calibration to maintain audio quality.
3Measurement precision
If test tones are played and recorded to evaluate calibration, then calibration accuracy is improved, but playback time is increased
Solution Approach 1:
The system plays only specific test tones at predetermined frequencies rather than full-range audio content during calibration. This partial action approach obtains sufficient information about room acoustics and device response with minimal time investment, avoiding the need to play complete music tracks or extended test sequences.
Solution Approach 2:
The calibration process is performed as a preliminary step before actual music playback, allowing the system to quickly establish equalization settings using brief test tones. Once calibrated, the system returns to normal music playback without requiring continuous time-consuming measurements, thus minimizing overall time loss.
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
Ensures consistent audio quality by detecting and correcting invalid calibration settings due to room changes, maintaining desirable frequency, temporal, and spatial responses.
Implementation Method 1
a first playback device uses a microphone to record audio played by a second playback device
Data Source
AI summary
An example method may include recording, via a microphone of a first playback device, audio played by a second playback device in accordance with a calibration setting. The method may further include, based on the recorded audio, determining that the calibration setting is invalid. The method may further include, in response to determining that the calibration setting is invalid, sending an indication that the calibration setting is invalid. This disclosure also includes example non-transitory computer readable media and playback devices that are related to the example method.