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POrecord audio in java and determine real time if a tone of x frequency was played if so do something
 

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  1. POrecord audio in java and determine real time if a tone of x frequency was played if so do something
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    <p>I want to be able to detect a tone of a predetermined frequency using java. What I am doing is playing a tone (the frequency of the tone is variable by user input) and I am trying to detect if the tone is of a certain frequency. If it is, I execute a certain method. From what I have read I will need to us FFT, but I'm not sure how to implement it in java. There seems to be a lot of documentation for how to do it, but what documentation there is involves looking at an audio file rather than real time analysis. I don't need to save the audio to a file just determine if and when a tone of frequency x was recorded.</p> <p>Ideally I would like to record at a sample rate of 44KHz and after determining if a tone was detected, determine when the tone was detected with an accuracy of +-3ms. However, an accuracy less than this would be acceptable as long as it isn't ridiculous (ie +100ms). I know roughly what I need to do from what I have looked up, but I need help tying it all together. Using pseudo code it would look roughly like this (I think)</p> <p>Note that I know roughly within +-1s of when a tone of satisfying frequency maybe detected</p> <pre><code>for(i = 0, i &lt; 440000 * 2, i++){//*2 because of expected appearance interval;may change record sound sample fft(sound sample) if(frequencySoundSample &gt; x){ do something return } } </code></pre> <p>There will be considerable background noise while the tone is played. However the tone will have a very high frequency, like 15-22KHz, so it is my belief that by simply looking for when the recorder detects a very high frequency I can be sure it is my tone (also the tone will be played with a high amplitude for maybe .5s or 1s). I know that there will not be other high frequency sounds as background noise (I am expecting a background frequency high of maybe 5KHz). </p> <p>I have two questions then. Is the pseudo code that I have provided sufficient for what I want to do? If it isn't or if there is a better way of doing this I'm all for it. Second, how would I implement this in java? I understand what I need to do, but I'm having trouble tying it all together. I'm pretty decent with java but I'm not familiar with the syntax involved with audio and I don't have any experience with fft. Please be explicit and give code with comments. I've been trying to figure this out for a while I just need to see it all tied together. Thank you.</p> <p>EDIT</p> <p>I understand that using a for loop like I have will not produce the frequency that I want. It was more to show roughly what I want. That is, recording, performing fft, and testing the frequency all at once as time progresses.</p>
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