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    <p>I believe the accepted answer answers another question -- it solves the same problem (downsampling the audio) but in another way (manually in stead of using the java sound API). I had the same thing and dug into it.</p> <p>The correct way (or java sound API way) to do this is indeed (as suggested in <a href="http://docs.oracle.com/javase/tutorial/sound/converters.html">http://docs.oracle.com/javase/tutorial/sound/converters.html</a>)</p> <pre><code>AudioFormat outDataFormat = new AudioFormat((float) 8000.0, (int) 8, (int) 1, true, false); AudioInputStream lowResAIS = AudioSystem.getAudioInputStream(outDataFormat, inFileAIS); </code></pre> <p>Problem is that standard java doesn't ship with resampling (or even stereo-mono conversion) code (or at least not in that part of the code -- see <a href="http://www.jsresources.org/faq_audio.html#convert_sample_rate">http://www.jsresources.org/faq_audio.html#convert_sample_rate</a>).</p> <p>The jsresources pages point to the answers as well: simply installing 2 plugins does the trick. Easiest is to install these plugins in the Extensions directory, on OSX Lion this will do the trick (provided you have wget):</p> <pre><code>wget http://www.tritonus.org/tritonus_share-0.3.6.jar -O /Library/Java/Extensions/tritonus_share-0.3.6.jar wget http://www.tritonus.org/tritonus_remaining-0.3.6.jar -O /Library/Java/Extensions/tritonus_remaining-0.3.6.jar </code></pre> <p>After adding these 2 jar files, everything worked (just one extra warning: if you want to change both the number of channels and the sample rate, it's still not supported as one step).</p>
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    1. POConverting the sample rate on-the-fly when reading a WAV file into a samples array with Java
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    1. USClaude
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