Headphone Fixture Calibration Using Compensation Filters
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Solution Overview
Problem
Headphone fixtures introduce signal errors that render measured electroacoustic performance characteristics inaccurate due to physical characteristics and positioning issues.
Innovation Solution
A system and method for calibrating headphone fixtures by generating test and reference electroacoustic performance signals, determining a difference signal, and defining a compensation filter to correct for anthropomorphic and headphone type variances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If headphone fixtures are used to measure electroacoustic performance characteristics, then measurement capability is provided, but signal errors are introduced that render measurements inaccurate
Solution Approach 1:
The patent introduces a compensation filter as an intermediary element between the headphone fixture and the measurement system. This filter acts as a mediator that corrects the signal errors introduced by the fixture's physical characteristics and positioning, thereby restoring measurement accuracy without requiring changes to the fixture itself.
Solution Approach 2:
The patent applies parameter changes by adjusting the electrical characteristics of the compensation filter to counteract the specific signal errors introduced by the fixture. By modifying the filter's frequency response parameters, the system compensates for fixture-induced distortions and achieves accurate electroacoustic measurements.
2Measurement precision
If compensation filter is defined based on electroacoustic performance difference signal, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the compensation filter based on the electroacoustic performance difference signal obtained during calibration. This pre-characterization approach allows the system to store and reuse compensation parameters for different headphone types and fixture configurations, reducing the need for complex real-time calculations and simplifying the overall system architecture.
Data Source
AI summary
A system for calibrating a headphone fixture includes one or more headphones disposed at the headphone fixture and a controller configured to generate a test electroacoustic performance signal based on an audio signal obtained from the one or more headphones, obtain a reference electroacoustic performance signal associated with one or more test subjects and the one or more headphones, determine an electroacoustic performance difference signal based on the test electroacoustic performance signal and the reference electroacoustic performance signal, define a compensation filter based on the electroacoustic performance difference signal, and determine whether the one or more headphones satisfy a performance criteria based on one or more additional test electroacoustic performance signals and the compensation filter.