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POIs it possible to find stretches of silence in audio files with Javascript?
 

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  1. POIs it possible to find stretches of silence in audio files with Javascript?
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    <p>I've been working on a tool to transcribe recordings of speech with Javascript. Basically I'm hooking up key events to play, pause, and loop a file read in with the <code>audio</code> tag.</p> <p>There are a number of advanced existing desktop apps for doing this sort of thing (such as <a href="http://annotation.exmaralda.org/index.php/Transcriber" rel="nofollow noreferrer">Transcriber</a> -- here's a <a href="http://web.archive.org/web/20061114025915/trans.sourceforge.net/img/screenshots/transcreen1.png" rel="nofollow noreferrer">screenshot</a>). Most transcription tools have a built-in waveform that can be used to jump around the audio file, which is very helpful because the transcriber can learn to visually find and repeat or loop phrases.</p> <p>I'm wondering if it's possible to emulate a subset of this functionality in the browser, with Javascript. I don't know much about signal processing, perhaps it's not even feasible.</p> <p>But what I envision is Javascript reading the sound stream from the file, and periodically sampling the amplitude. If the amplitude is very low for longer than a certain threshhold of time, then that would be labled as a phrase break. </p> <p>Such labeling, I think, would be very useful for transcription. I could then set up key commands to jump to the previous period of silence. So hypothetically (imagining a jQuery-based API):</p> <pre><code>var audio = $('audio#someid'); var silences = silenceFindingVoodoo(audio); </code></pre> <p><code>silences</code> will then contain a list of times, so I can hook up some way to let the user jump around through the various <code>silence</code>s, and then set the <code>currentTime</code> to a chosen value, and play it.</p> <p>Is it even conceivable to do this sort of thing with Javascript? </p>
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