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A Self-Calibrating Earphone

自校准耳机

 

A self-calibrating system estimates the acoustical transfer function from sound pressures at the entrance of the ear canal to sound pressures at the eardrum: An earphone plays a broadband sound into the auditory meatus and an in-ear microphone then receives the sound at the entrance of the ear canal. Parenthetically, assessing calibration, results showed that spectral analysis of recordings of this signal is replicable to within 3 dB from 0.5 to 22 kHz for each given ear. A digital signal processing unit calculates an individualized filter from that signal. The calculated filter neutralizes the transfer function via software, which controls the digital signal processing unit’s output into the earphones whilst playing media.

耳机的自我校准系统根据耳道入口处的声压和耳膜处的声压来估算出其间的声学传递函数:耳机在耳道中播放宽频声音的同时,一个入耳式麦克风在耳道入口处接收声音。附带说一下,评估校准后,结果表明对于不同的耳朵,该记录信号的频谱从0.5到22kHz范围内,重现误差不超过3dB。数字信号处理单元根据该信号计算出一个个性化的滤波器。被计算出的滤波器通过软件来均衡传递函数,并在播放媒体音频时,控制电子信号处理设备输出到耳机的信号。

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