Multi-Driver Audio Calibration With Staggered Frequency Sweeps
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Solution Overview
Problem
Existing media playback systems face challenges in accurately calibrating multiple loudspeakers in a concurrent manner without interference, as simultaneous emission of calibration sounds can lead to overlapping frequencies, making it difficult for control devices to obtain high-quality measurements.
Innovation Solution
The implementation of a hybrid calibration sound that includes a noise component for low frequencies and a swept signal component for higher frequencies, with staggered emission and extended duration to prevent interference, allowing for effective calibration of multiple playback devices while avoiding unpleasant transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple loudspeakers emit calibration sounds simultaneously, then calibration time is reduced, but frequency overlap occurs making measurements difficult
Solution Approach 1:
The calibration process is segmented by assigning different frequency ranges to different loudspeakers. Each loudspeaker emits calibration sounds within its designated frequency band, preventing frequency overlap while maintaining concurrent operation. This segmentation allows simultaneous calibration of multiple devices without measurement interference.
2Productivity
If calibration sounds are emitted concurrently, then calibration efficiency increases, but frequency interference occurs
Solution Approach 1:
Each loudspeaker is assigned a specific frequency range for calibration sound emission. This local quality assignment ensures that each device operates within its designated spectral territory, eliminating frequency interference while maintaining concurrent calibration operations across multiple loudspeakers.
3Device complexity
If a single frequency range is used for all loudspeakers, then calibration process is simplified, but frequency overlap prevents accurate measurement
Solution Approach 1:
The overall frequency spectrum is segmented into distinct bands, with each loudspeaker assigned to a specific band. This segmentation maintains measurement accuracy by preventing frequency overlap while keeping the calibration process relatively simple through automated frequency range assignment and concurrent operation.
Data Source
AI summary
Examples involve calibration of a playback device including multiple audio transducers. An example implementation involves forming a particular playback configuration that configures the multiple audio transducers to form two or more channels and receiving a command to initiate calibration of the particular playback configuration. The calibration includes emitting a calibration sound according to a sequence that involves the calibration sound cycling through frequencies of a calibration frequency range. Based on the command, the playback device emits the calibration sound contemporaneously via the two or more channels. Emission of the calibration sound by each channel is staggered such that each emitted calibration sound is delayed relative to a preceding emitted calibration sound. The playback device receives audio processing coefficients that are based on one or more recordings of the emitted calibration sound; and applies the audio processing coefficients when playing back the audio content as part of the particular playback configuration.