http://www.mitov.com/wiki/index.php?action=history&feed=atom&title=Enum_item_ALSpeexCompressor.TALSpeexBandMode.alSpeexNarrowBand 2026-04-06T01:08:46Z Revision history for this page on the wiki MediaWiki 1.17.0 http://www.mitov.com/wiki/index.php?title=Enum_item_ALSpeexCompressor.TALSpeexBandMode.alSpeexNarrowBand&diff=6734&oldid=prev 2011-11-22T00:23:09Z

<p>Automated Syncronization with Documentation</p> <p><b>New page</b></p><div>&lt;b&gt;&lt;span style=&quot;color:red&quot;&gt;<br /> This is a Beta Read Only version of this page. <br /> Please review and send recommendations to [mailto:mitov@mitov.com mitov@mitov.com]. <br /> We will enable the editing as soon as we are happy with the overall Wiki site.<br /> &lt;/span&gt;&lt;/b&gt;<br /> <br /> '''Package:''' [[Package AudioLabPkg|AudioLabPkg]]<br /> <br /> '''Unit:''' [[Unit ALSpeexCompressor|ALSpeexCompressor]]<br /> <br /> '''Enum:''' [[Enum ALSpeexCompressor.TALSpeexBandMode|TALSpeexBandMode]]<br /> <br /> == Description ==<br /> This section looks at how Speex works for narrowband (8kHz<br /> sampling rate) operation.<br /> <br /> The frame size for this mode is 20 ms, corresponding to 160<br /> samples. Each frame is<br /> <br /> also subdivided into 4 sub-frames of 40 samples each.<br /> <br /> Also many design decisions were based on the original goals<br /> and assumptions:<br /> <br /> • Minimizing the amount of information extracted from past<br /> frames (for robustness<br /> <br /> to packet loss)<br /> <br /> • Dynamically-selectable codebooks (LSP, pitch and<br /> innovation)<br /> <br /> • sub-vector fixed (innovation) codebooks</div>

David Alm