3rdparty/speex/html/index.html - pjproject - Gitiles

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   <title>The Speex Speech Codec</title>


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 <img src="speex.png" alt="Speex">
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 <br>
 <br>


              <a href="http://sourceforge.net/projects/speex">The Speex project</a>
           aims  to build an open-source (LGPL) <A href="patents.html">patent-free</A> voice codec. Unlike
   other codecs   like  MP3 and <a href="http://www.vorbis.org/">Ogg Vorbis</a>,
 Speex is specially designed for compressing voice at low bit-rates in the
 8-32 kbps/channel range. Possible applications include Voice over IP (VoIP),
  Internet audio streaming, archiving of speech data (e.g. voice mail), and
 audio books. In some sense, it is meant to  be complementary to the
 Ogg Vorbis codec.
 <p>If you are interested in participating to the project, contact us at <a href="mailto:speex-devel@lists.sourceforge.net">
            speex-devel@lists.sourceforge.net</a>  or <a href="http://lists.sourceforge.net/lists/listinfo/speex-devel">
            join  our mailing list</a>. Right now, we are mostly looking for
  developers with signal processing and speech coding knowledge, as well
  as people with knowledge about patents in that field. See the
 <A href="http://sourceforge.net/pm/task.php?group_project_id=19556&group_id=46651&func=browse">task list</A> for more details about what's left to do in Speex<br>
 </p>


 <h2>Download</h2>


            You can download Speex from <a href="http://sourceforge.net/project/showfiles.php?group_id=46651">
            here</a>.<br>


 <h2>Documentation</h2>
 This Speex manual includes information about the
 algorithms used in Speex, the bit-stream, the API and more.
 <br>
 <A href="manual.pdf">Speex manual (PDF)</A>
 <br>
 <A href="manual.ps">Speex manual (Postscript)</A>
 <br>
 <A href="manual/">Speex manual (HTML online)</A>
 <br>
 <A href="manual.tar.gz">Speex manual (HTML tarball)</A>
 <br><br>
 There is also some API documentation generated by Doxygen directly from the header files
 <br>
 <A href="refman.pdf">Speex API (PDF)</A>

 <h2>Samples</h2>

 You can listen to samples encoded with Speex <A href="/audio/samples/">here</A>

 <h2>Who uses Speex</h2>

 <A href="http://www.linphone.org">LinPhone</a>: A SIP-based VoIP phone written for GNOME
 <br>
 <A href="http://jzb.rapanden.dk/speex/">Speex XMMS plugin</a> written by <a href="mailto:jzb@rapanden.dk">Jens Burkal</a>
 <br>
 <A href="http://www.openh323.org">OpenH323</a>: An open-source H.323 stack
 <br>
 <A href="http://www.gnomemeeting.org">GnomeMeeting</A>: A H323 Video Conferencing Program

 <br><br>
 In development:
 <br>
 <A href="http://www.asteriskpbx.org">Asterisk</a>: An open-source PBX

 <h2>News</h2>

 <h3>2002/09/04</h3>

 Speex 0.8.1 released. This release fixes a bug in the new 0.8 API (function
 speex_mode_query). For those using only speexenc/speexdec, no need to upgrade
 but those using libspeex (directly or through another application) should.

 <h3>2002/08/24</h3>
   Speex 0.8.0 released. The speex_decode() function no longer uses the
 'lost' parameter. Applications will need
   to be updated.

 <h3>2002/08/09</h3>
   Speex 0.7.0 released. The format of the bit stream has changed once again
 and the bandwidth required has been
   reduced slightly.

 <h3>2002/08/01</h3>

 Speex 0.6.0 has been released. This is a major release that contains many improvements and lots of bug-fixing. The post-filter that was causing problems throughout 0.5.x was replaced with a new perceptual enhancement system, which sounds better and consume much less CPU. Also many changes to Ogg encoder/decoder, including possibility to see the bit-rate being played/encoded. There is also a discontinuous transmission (DTX) mode. Last but not least, 0.6.0 now reports no error when being run with the valgrind memory debugger.

 <h3>2002/07/26</h3>

 Speex 0.5.2 is out and brings a number of improvements and bug fixes. First,
 the search has been improved and it is now possible to choose the right
 quality/encoding time tradeoff (--comp option). Is is also possible to pack
 more that one frame in an Ogg packet (--nframes), reducing the overhead for
 low bit-rates. Last but not least: there is now some documentation about
 Speex!


 <h3>2002/07/17</h3>

 Version 0.5.1 is released. This release brings quality improvements at very
 low bit-rate (5.7 kbps) and a new post-filter. VBR should also be a bit
 better though there's still a lot to do. Most of the modes are bit-rate
 compatible with 0.5.0, with the exception of the very low bit-rate (which is
 sometimes used in VBR, so expect some glitches). The source (and probably
 binary) compatibility with 0.5.0 is maintained.

 <h3>2002/07/08</h3>

 Speex 0.5.0 is out. The most important new feature is Varible Bit-Rate
 (VBR). It can be enabled by using the --vbr option to speexenc. When
 encoding in VBR, the --quality option can still be used. Note VBR
 implementation in this release is experimental and still requires lots of
 tuning.

 <h3>2002/06/23</h3>

 Speex 0.4.0 is here, adding many more bit-rates to both narrowband and wideband, as
 well as the ability to change bit-rate dynamically from frame to frame. The
 narrowband modes now range from 8 kbps to 18 kbps, while wideband range from
 10 kbps to 28 kbps. There is also a "noise coding" mode at 2 kbps for
 narrowband and 3 kbps for wideband. All this will lead to real Variable
 Bit-Rate (VBR) in the future. Also, worth mentioning the codec latency has
 been reduced from 40 ms to 30 ms (20 ms frames + 10 ms lookahead).

 <h3>2002/06/12</h3>

 Speex 0.3.0 has been released. There is now a new "low bit-rate" narrowband
 mode for coding speech at 8 kbps. There's also support for big-endian
 machines (untested, please report bugs). Speex files now have real header
 containing information like bit-stream version (revents from playing an
 incompatible bit-stream), sampling rate, bit-rate and user comments. On the
 quality side, the post-filter has been improved and there has been more
 codebook optimization. Note that this release breaks bit-stream
 compatibility with previous releases.

 <h3>2002/06/07</h3>

 Speex 0.2.0 is out. This is a major release with lots of improvements and
 bugfixes. First, the encoder and decoder can work directly from wav files
 (mono only for now) and the decoder can play directly to soundcard. Also,
 most of the codebooks have been re-trained in order to improve quality (but
 this also breaks format compatibility with previous versions), while
 slightly decreasing complexity. Speex is now able to encode both DTMF and
 music (not as good as Vorbis of course) after bugs were fixed in the pitch
 prediction and LSP quantization. Last but not the least, the perceptual
 post-filter has been improved.

 <h3>2002/06/04</h3>

 Speex 0.1.2 is out. This adds a perceptual post-filter at the decoder to
 (hopefully) increase quality. It can be enabled with the --pf option to
 speexdec. The Speex format remains the same for both narrowband
 and wideband.

 <h3>2002/05/15</h3>

 Speex 0.1.0 has been released. Speex now uses the Ogg bitstream (using
 libogg). That means that there is now (limited) bitstream error
 recovery. Also, the narrowband bit-rate has been reduced from 15.7 kbps to
 15.1 kbps and the wideband bit-rate has been reduced from 31.3 kbps to 27.7
 kbps.  The quality remains roughly the same for both narrowband and
 wideband.  Once again, this breaks compatibility with previous versions.

 <hr width="100%" size="2">
 <div align="right"><a href="http://uk.eurorights.org/issues/cd/quick/"><img
 border="0" width="160" height="40" src="badcd002.png"
 alt="Say NO to corrupt audio discs" /></a>
 <br>
 <img src="http://sourceforge.net/sflogo.php?group_id=46651&amp;amp;type=5" alt="SourceForge Logo">
 <br>

 <a href="mailto:jean-marc.valin@hermes.usherb.ca">Jean-Mrc Valin</a>       <br>
             $Date: 2002/09/16 00:59:10 $</div>


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	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">







	<meta name="GENERATOR" content="Mozilla/4.78 [fr] (X11; U; Linux 2.4.17 i686) [Netscape]">







	<meta name="Author" content="Jean-Marc Valin">
	<title>The Speex Speech Codec</title>






	</head>

	<body text="#000000" bgcolor="#ffffff" link="#0000ef" vlink="#59188e" alink="#ff0000">

	<center>
	<img src="speex.png" alt="Speex">
	</center>
	<br>
	<br>


	<a href="http://sourceforge.net/projects/speex">The Speex project</a>
	aims to build an open-source (LGPL) <A href="patents.html">patent-free</A> voice codec. Unlike
	other codecs like MP3 and <a href="http://www.vorbis.org/">Ogg Vorbis</a>,
	Speex is specially designed for compressing voice at low bit-rates in the
	8-32 kbps/channel range. Possible applications include Voice over IP (VoIP),
	Internet audio streaming, archiving of speech data (e.g. voice mail), and
	audio books. In some sense, it is meant to be complementary to the
	Ogg Vorbis codec.
	<p>If you are interested in participating to the project, contact us at <a href="mailto:speex-devel@lists.sourceforge.net">
	speex-devel@lists.sourceforge.net</a> or <a href="http://lists.sourceforge.net/lists/listinfo/speex-devel">
	join our mailing list</a>. Right now, we are mostly looking for
	developers with signal processing and speech coding knowledge, as well
	as people with knowledge about patents in that field. See the
	<A href="http://sourceforge.net/pm/task.php?group_project_id=19556&group_id=46651&func=browse">task list</A> for more details about what's left to do in Speex<br>
	</p>




	<h2>Download</h2>



	You can download Speex from <a href="http://sourceforge.net/project/showfiles.php?group_id=46651">
	here</a>.<br>


	<h2>Documentation</h2>
	This Speex manual includes information about the
	algorithms used in Speex, the bit-stream, the API and more.
	<br>
	<A href="manual.pdf">Speex manual (PDF)</A>
	<br>
	<A href="manual.ps">Speex manual (Postscript)</A>
	<br>
	<A href="manual/">Speex manual (HTML online)</A>
	<br>
	<A href="manual.tar.gz">Speex manual (HTML tarball)</A>
	<br><br>
	There is also some API documentation generated by Doxygen directly from the header files
	<br>
	<A href="refman.pdf">Speex API (PDF)</A>

	<h2>Samples</h2>

	You can listen to samples encoded with Speex <A href="/audio/samples/">here</A>

	<h2>Who uses Speex</h2>

	<A href="http://www.linphone.org">LinPhone</a>: A SIP-based VoIP phone written for GNOME
	<br>
	<A href="http://jzb.rapanden.dk/speex/">Speex XMMS plugin</a> written by <a href="mailto:jzb@rapanden.dk">Jens Burkal</a>
	<br>
	<A href="http://www.openh323.org">OpenH323</a>: An open-source H.323 stack
	<br>
	<A href="http://www.gnomemeeting.org">GnomeMeeting</A>: A H323 Video Conferencing Program

	<br><br>
	In development:
	<br>
	<A href="http://www.asteriskpbx.org">Asterisk</a>: An open-source PBX

	<h2>News</h2>

	<h3>2002/09/04</h3>

	Speex 0.8.1 released. This release fixes a bug in the new 0.8 API (function
	speex_mode_query). For those using only speexenc/speexdec, no need to upgrade
	but those using libspeex (directly or through another application) should.

	<h3>2002/08/24</h3>
	Speex 0.8.0 released. The speex_decode() function no longer uses the
	'lost' parameter. Applications will need
	to be updated.

	<h3>2002/08/09</h3>
	Speex 0.7.0 released. The format of the bit stream has changed once again
	and the bandwidth required has been
	reduced slightly.

	<h3>2002/08/01</h3>

	Speex 0.6.0 has been released. This is a major release that contains many improvements and lots of bug-fixing. The post-filter that was causing problems throughout 0.5.x was replaced with a new perceptual enhancement system, which sounds better and consume much less CPU. Also many changes to Ogg encoder/decoder, including possibility to see the bit-rate being played/encoded. There is also a discontinuous transmission (DTX) mode. Last but not least, 0.6.0 now reports no error when being run with the valgrind memory debugger.

	<h3>2002/07/26</h3>

	Speex 0.5.2 is out and brings a number of improvements and bug fixes. First,
	the search has been improved and it is now possible to choose the right
	quality/encoding time tradeoff (--comp option). Is is also possible to pack
	more that one frame in an Ogg packet (--nframes), reducing the overhead for
	low bit-rates. Last but not least: there is now some documentation about
	Speex!


	<h3>2002/07/17</h3>

	Version 0.5.1 is released. This release brings quality improvements at very
	low bit-rate (5.7 kbps) and a new post-filter. VBR should also be a bit
	better though there's still a lot to do. Most of the modes are bit-rate
	compatible with 0.5.0, with the exception of the very low bit-rate (which is
	sometimes used in VBR, so expect some glitches). The source (and probably
	binary) compatibility with 0.5.0 is maintained.

	<h3>2002/07/08</h3>

	Speex 0.5.0 is out. The most important new feature is Varible Bit-Rate
	(VBR). It can be enabled by using the --vbr option to speexenc. When
	encoding in VBR, the --quality option can still be used. Note VBR
	implementation in this release is experimental and still requires lots of
	tuning.

	<h3>2002/06/23</h3>

	Speex 0.4.0 is here, adding many more bit-rates to both narrowband and wideband, as
	well as the ability to change bit-rate dynamically from frame to frame. The
	narrowband modes now range from 8 kbps to 18 kbps, while wideband range from
	10 kbps to 28 kbps. There is also a "noise coding" mode at 2 kbps for
	narrowband and 3 kbps for wideband. All this will lead to real Variable
	Bit-Rate (VBR) in the future. Also, worth mentioning the codec latency has
	been reduced from 40 ms to 30 ms (20 ms frames + 10 ms lookahead).

	<h3>2002/06/12</h3>

	Speex 0.3.0 has been released. There is now a new "low bit-rate" narrowband
	mode for coding speech at 8 kbps. There's also support for big-endian
	machines (untested, please report bugs). Speex files now have real header
	containing information like bit-stream version (revents from playing an
	incompatible bit-stream), sampling rate, bit-rate and user comments. On the
	quality side, the post-filter has been improved and there has been more
	codebook optimization. Note that this release breaks bit-stream
	compatibility with previous releases.

	<h3>2002/06/07</h3>

	Speex 0.2.0 is out. This is a major release with lots of improvements and
	bugfixes. First, the encoder and decoder can work directly from wav files
	(mono only for now) and the decoder can play directly to soundcard. Also,
	most of the codebooks have been re-trained in order to improve quality (but
	this also breaks format compatibility with previous versions), while
	slightly decreasing complexity. Speex is now able to encode both DTMF and
	music (not as good as Vorbis of course) after bugs were fixed in the pitch
	prediction and LSP quantization. Last but not the least, the perceptual
	post-filter has been improved.

	<h3>2002/06/04</h3>

	Speex 0.1.2 is out. This adds a perceptual post-filter at the decoder to
	(hopefully) increase quality. It can be enabled with the --pf option to
	speexdec. The Speex format remains the same for both narrowband
	and wideband.

	<h3>2002/05/15</h3>

	Speex 0.1.0 has been released. Speex now uses the Ogg bitstream (using
	libogg). That means that there is now (limited) bitstream error
	recovery. Also, the narrowband bit-rate has been reduced from 15.7 kbps to
	15.1 kbps and the wideband bit-rate has been reduced from 31.3 kbps to 27.7
	kbps. The quality remains roughly the same for both narrowband and
	wideband. Once again, this breaks compatibility with previous versions.

	<hr width="100%" size="2">
	<div align="right"><a href="http://uk.eurorights.org/issues/cd/quick/"><img
	border="0" width="160" height="40" src="badcd002.png"
	alt="Say NO to corrupt audio discs" /></a>
	<br>
	<img src="http://sourceforge.net/sflogo.php?group_id=46651&amp;type=5" alt="SourceForge Logo">
	<br>

	<a href="mailto:jean-marc.valin@hermes.usherb.ca">Jean-Mrc Valin</a> <br>
	$Date: 2002/09/16 00:59:10 $</div>




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