Each recording had a series of rhyming words that the volunteers had to identify, with and without the intelligent microphone, for different levels of background noise.

每段录音都有一系列的押韵字词，志愿者要在不同程度的背景噪音下佩戴与不佩戴该智能扩音器来辨别这些词。

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Lastly, and perhaps most notably, I once sang the national anthem at a World Series baseball game, though I was not in the vicinity of the microphone at the time.

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Last in the Caliber series is the Vanguard, which has been designed to include 7.1 channel audio, a retractable microphone, and an optional bass vibration feature for fully immersive gaming.

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