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<div id="projectname">libambix
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<div id="projectbrief">the AMBIsonics eXchange library</div>
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<div class="title">Frequently Asked Questions </div> </div>
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<div class="textblock"><h1><a class="anchor" id="Terms"></a>
Terms</h1>
<h2><a class="anchor" id="term-ambix"></a>
What does libambix stand for?</h2>
<p><code>libambix</code> is a <b>lib</b>rary for reading and writing <b>ambi</b>sonics e<b>x</b>change files.</p>
<h2><a class="anchor" id="basic-vs-extended"></a>
What is the difference between BASIC and EXTENDED ambix files?</h2>
<p><code>BASIC</code> ambix files contain exactly a full set of periphonic ambisonics channels, using ACN channel ordering and SN3D normalisation.</p>
<p><code>EXTENDED</code> ambix files contain an additional adaptor matrix at the beginning of the file, which can be used to turn the actually stored audio channels into a full set of periphonic ambisonics channels (periphonic, ACN, SN3D). These files can be used to store a reduced number of channels (e.g. when your soundfield is horizontal only, there is no need to store the channels with height-information, as they will be muted anyhow), while providing a simple and standardized way to play them back on a full ambisonics decoder.</p>
<p>See <a class="el" href="format.html">The ambix format</a> for more information.</p>
<h1><a class="anchor" id="HOW-TOs"></a>
HOW-TOs</h1>
<h2><a class="anchor" id="howto-channels2basic"></a>
How can I create an ambix file from a set of mono soundfiles?</h2>
<p>If you have an ambisonics recording as multiple mono soundfiles following the ambix standard (channel ordering: ACN, normalisation: SN3D), you can merge them into an ambix files using the <code>ambix-interleave</code> command. </p><div class="fragment"><div class="line">ambix-interleave -o ambixfile.caf recording-ambi0.wav recording-ambi1.wav recording-ambi2.wav recording-ambi3.wav</div></div><!-- fragment --><h2><a class="anchor" id="howto-multichannel2basic"></a>
How can I create an ambix file from a multichannel soundfile?</h2>
<p>If you have an ambisonics recording already as a multichannel soundfile, with the channels following the ambix standard (channel ordering: ACN, normalisation: SN3D), you can create an ambix file from that using the <code>ambix-interleave</code> command. </p><div class="fragment"><div class="line">ambix-interleave -o ambixfile.caf recording.wav</div></div><!-- fragment --><h2><a class="anchor" id="howto-amb2extended"></a>
How can I convert my .amb files to ambix?</h2>
<p>You can use the <code>ambix-interleave</code> file to create EXTENDED ambix files from your old .amb recordings. If <code>ambix-interleave</code> detects that the input is an .amb file, it will add an adaptor matrix that converts from .amb's Furse-Malham channels to ambix channels, and will otherwise leave the audio data intact. </p><div class="fragment"><div class="line">ambix-interleave -o ambixfile.caf recording.amb</div></div><!-- fragment --><h2><a class="anchor" id="howto-amb2basic"></a>
How can I convert my .amb files to ambix?</h2>
<p>To create BASIC ambix files (without an adaptor matrix), you can use <code>ambix-deinterleave</code> to convert the .amb file to SN3D/ACN channels, and then use <code>ambix-interleave</code> to merge those files into a single ambix file: </p><div class="fragment"><div class="line">ambix-deinterleave recording.amb</div><div class="line">ambix-interleave -o ambixfile.caf recording-ambi*</div></div><!-- fragment --><h2><a class="anchor" id="howto-extended2basic"></a>
How can I convert an EXTENDED ambix file to BASIC?</h2>
<p>The easiest way to convert an EXTENDED ambix file to a BASIC file is to first extract the channels into separate files using <code>ambix-deinterleave</code>, and then merge them back using <code>ambix-interleave</code>: </p><div class="fragment"><div class="line">ambix-deinterleave ambixextended.caf</div><div class="line">ambix-interleave -o ambixbasic.caf ambixextended-ambi*</div></div><!-- fragment --> </div></div><!-- contents -->
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