Spectral filtering done by our outer ears.
光谱过滤由外耳。
The results show, spectral filtering technology is an effective way to improve signal-to-noise ratio.
研究结果表明：光谱滤波技术能有效提高信噪比。
Spectral filtering: Sounds coming from different directions bounce off the inside of the outer ears in different ways.
光谱过滤：来自不同方向的声音反弹外耳的内部以不同的方式。
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