Headphone Driver Linearization via Pre-computed Correction Filters
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Solution Overview
Problem
Current technologies fail to provide enhanced perception of ambiance, soundstage, and imaging in headphones and do not linearize in-ear monitors in both amplitude and time domains, lacking crossfeed between channels and synchronization of headphone drivers.
Innovation Solution
A method and system that involve receiving and processing channel measurement data to generate corrective signals for linearizing audio devices in amplitude and time domains, using crossfeed algorithms, frequency amplitude matching, and phase correction procedures to synchronize drivers and correct in-ear monitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current headphone technologies are used, then basic audio playback is achieved, but enhanced perception of ambiance, soundstage, and imaging is not provided
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction filters based on impulse response measurements taken during manufacturing. These correction filters are embedded in the headphone device and automatically applied during playback, eliminating the need for real-time complex calculations while achieving enhanced perception of ambiance, soundstage, and imaging.
Solution Approach 2:
The patent uses copying by creating digital models of the acoustic environment and speaker positions through impulse response measurements. These digital copies are then processed to generate correction filters that simulate the acoustics of a proper listening environment, providing enhanced spatial perception without requiring physical acoustic spaces.
2Measurement precision
If crossfeed algorithms are implemented, then stereo imaging and soundstage are enhanced, but computational requirements increase
Solution Approach 1:
The crossfeed correction filters are pre-computed during manufacturing based on impulse response measurements and stored in the device. During playback, the device simply applies these pre-computed filters rather than performing complex real-time calculations, significantly reducing computational power requirements while maintaining enhanced stereo imaging accuracy.
3Manufacturing precision
If driver synchronization is achieved through linearization, then amplitude and time domain accuracy improve, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing driver linearization during the manufacturing process. Impulse response measurements are taken for each driver, correction filters are calculated and stored, and the drivers are synchronized before the product reaches the consumer. This approach achieves high manufacturing precision while keeping the consumer device relatively simple.
4Measurement precision
If in-ear monitors are linearized in both amplitude and time domains, then frequency response accuracy improves, but measurement and correction process complexity increases
Solution Approach 1:
The patent applies preliminary action by completing all measurement and correction work during the manufacturing process. Impulse response measurements are taken, correction filters are calculated for both amplitude and time domain linearization, and these corrections are embedded in the device before it reaches the consumer. This approach achieves high frequency response accuracy while making the consumer device simple to use.
Data Source
AI summary
A method and system for facilitating enhanced perception of ambiance soundstage and imaging as well as frequency and phase response linearization in audio devices is provided. The method includes receiving measurement data from an omnidirectional microphone and linearizing the data, both in the amplitude and time domains, using digital signal processing. The method also includes a crossfeed algorithm designed to emulate sound propagation from speakers.