声音确定音频频率经由麦克风接收 [英] Determine the audio frequency of sound received via the microphone

问题描述

我想知道如何去确定通过麦克风捕捉在手机上各种声音的频率。

I am trying to understand how to go about determining the frequency of various sounds captured on the phone via microphone.

我试图显示图形绘制音符的频率。

I am attempting to display a graph plotting the frequency of the note.

推荐答案

注释大多数乐器生产可能含有大量的频率频谱内容。另外一个音符的频谱可能包含或不包含显著的峰值在什么人会打电话音符的音高。所以，你甚至可以不问正确的问题。

The "notes" produced by most musical instruments may contain spectral content at a large number of frequencies. Furthermore the frequency spectrum of a "note" may or may not contain significant peaks at what a human would call the musical pitch of the note. So you may not even be asking the correct question.

有一个关于这个问题的详细解说一个答案这个计算器问题

There's more commentary on this issue in one answer to this stackoverflow question.

一个摄谱仪（经由FFT或其它滤波器组的重复使用）是一种常用的技术，用于显示，以图形方式对时间作图，包含在捕获的声音的频率，具有折衷时间响应与频率分辨率。

A spectrograph (via repeated usage of an FFT or other filter bank) is a common technique for displaying, in graphic form plotted against time, the frequencies contained in captured sound, with a trade-off in time response versus frequency resolution.

有例如摄谱仪code在苹果的 aurioTouch 提供的示例应用程序从iOS开发者网站。

There's example spectrograph code in Apple's aurioTouch sample app available from the iOS Developer web site.

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