The maximum sample rate is 48KHz so the maximum theoretical signal frequency that can be captured is 24KHz by the Nyquist-Shannon theorem (http://en.m.wikipedia.org/wiki/Nyquist–Shannon_sampling_theorem). I doubt the built in microphone is any good near that frequency, though (and Ryan's link supports that with frequency-response measurements).
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最大采样率为 48KHz，因此根据奈奎斯特-香农定理 (http://en.m.wikipedia.org/wiki/Nyquist–Shannon_sampling_theorem)，可以捕获的最大理论信号频率为 24KHz。不过，我怀疑内置麦克风在该频率附近是否有任何好处（Ryan 的链接支持频率响应测量）。
The maximum sample rate is 48KHz so the maximum theoretical signal frequency that can be captured is 24KHz by the Nyquist-Shannon theorem (http://en.m.wikipedia.org/wiki/Nyquist–Shannon_sampling_theorem). I doubt the built in microphone is any good near that frequency, though (and Ryan's link supports that with frequency-response measurements).
http://blog.faberacoustical.com/2009/iphone/ iphone-microphone-Frequency-response-comparison/
看起来答案是否定的。
http://blog.faberacoustical.com/2009/iphone/iphone-microphone-frequency-response-comparison/
Looks like the answer is no.