通过频率样本的选择部 [英] Selecting part of a sample by frequency

问题描述

我不知道是否有一种方法在给定频率来选择样本的一部分。我认为指数频率样品使用FFT，但这样做的唯一途径似乎乱了样本，以便它实际上不是可玩了。我在想，人们可能怎么回事，在给定频率，同时保持声音可理解选择样品的一部分吗？

I'm wondering if there is a way to select part of a sample at a given frequency. The only way I can think to index the sample by frequency is using an FFT, but doing that seems to mess up the sample so that it's not actually playable anymore. I was wondering how else one might select the part of a sample at a given frequency whilst keeping the sound intelligible?

编辑：确切的指示是合成间距150赫兹和持续时间5秒每个元音的一个例子

The exact instructions were "synthesize an example of each vowel of pitch 150 Hz and duration 5 seconds".

编辑：我完全误解了我需要做的本来。新的问题是在这里：<一href=\"http://stackoverflow.com/questions/19910606/synthesizing-vowel-from-existing-audio-sample-jin-matlab\">Synthesizing从现有的音频采样斤MATLAB 元音

I completely misunderstood what I needed to do originally. New question is here: Synthesizing vowel from existing audio sample jin matlab

推荐答案

确切的说法暗示，你被要求的合成的，即创建一个新的信号，不筛选，或修改现有的信号。此外，它会询问有关的 基本频率 150赫兹的（它使用。字的音调的而不是频率的我假设基本频率是不够好，和/或他们的意思：）

The exact phrasing suggests you are being asked to synthesize, ie create a new signal, not filter, or modify an existing signal. Moreover it asks about a fundamental frequency of 150 Hz (It uses the word pitch and not frequency. I'm assuming that fundamental frequency is good enough and/or what they meant :).

所以，让我试试重新措辞的问题要问你：

So, let me try rewording the question for you:

Do the following for each vowel sound (A, E, I, O, U, etc):
    Create a 5 second sound with a fundamental frequency of 150 Hz.

我能想到的两种方法来解决这个问题：1，总结了一些正弦波（所有这一切都将是150赫兹的倍数）以不同的强度。知道了强度是这里的窍门。或2开始与150Hz的脉冲和过滤。知道确切的过滤器，用在这里的伎俩，虽然使用正确的脉冲可能会产生一定的影响，以及。无论哪种方式，您不需要或不希望在生成阶段的FFT。如果不能或不想查找上面的未知数，你的可能的使用FFT来分析一个真实的人说这些声音，并使用分析结果，以填补空白。它不会太难做到这一点，但它可能是覆盖在语音和/或声学先进的教科书。

I can think of two ways to solve this problem: 1. sum up some sine waves (all of which will be a multiple of 150 Hz) at different intensities. Knowing the intensities is the trick here. or 2. Start with a pulse of 150 Hz and filter it. Knowing the exact filter to use is the trick here, although using the right pulse will probably have some impact as well. Either way, you don't need or want an FFT in the generation stage. If you can't or don't want to look up the unknowns above, you could use an FFT to analyze a real person saying those sounds and use the results of the analysis to fill in the gaps. It wouldn't be too hard to do that, but it's probably covered in an advanced textbook on phonetics and/or acoustics.

如果您需要更详细的答案，也许你应该创建一个新的问题，并在此处链接的帮助回答这个。我建议以下标记，如果它们存在：

If you need a more detailed answer, perhaps you should create a new question and link it here for help answering that. I suggest the following tags, if they exist:

• 语音合成


• 过滤


• 音频


• 语音

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