在iPhone上获取音频输入的频率 [英] Get Frequency for Audio Input on iPhone

问题描述

如何获取iPhone上音频输入的频率?如果我只想找到特定的频率(即在x毫秒的时间范围内，检查是否在y Hz处有一个峰值)，是否有必要使用FFT?

How can I get the frequency for an audio input on iPhone? Is it necessary to use a FFT if I'm only interested in finding a specific frequency (i.e. within a timeframe of x milliseconds, check if there is a peak at y Hz)?

推荐答案

如果您只对特定的固定频率(即纯音)感兴趣，则可以使用

If you're just interested in a specific, fixed frequency (i.e. a pure tone) then you can use the Goertzel algorithm which is very simple to implement and relatively lightweight (computationally) compared to an FFT.

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