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Current libsamplerate source
author Chris Cannam
date Tue, 18 Oct 2016 13:24:45 +0100
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rev   line source
Chris@41 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
Chris@41 2 <HTML>
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Chris@41 4 <HEAD>
Chris@41 5 <TITLE>
Chris@41 6 Secret Rabbit Code (aka libsamplerate)
Chris@41 7 </TITLE>
Chris@41 8 <META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)">
Chris@41 9 <META NAME="Version" CONTENT="libsamplerate-0.1.8">
Chris@41 10 <META NAME="Description" CONTENT="The Secret Rabbit Code Home Page">
Chris@41 11 <META NAME="Keywords" CONTENT="libsamplerate sound resample audio dsp Linux">
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Chris@41 14
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Chris@41 26 <BR>
Chris@41 27 <DIV CLASS="nav">
Chris@41 28 <BR>
Chris@41 29 <A HREF="index.html">Home</A><BR>
Chris@41 30 <A HREF="license.html">License</A><BR>
Chris@41 31 <A HREF="history.html">History</A><BR>
Chris@41 32 <A HREF="download.html">Download</A><BR>
Chris@41 33 <A HREF="quality.html">Quality</A><BR>
Chris@41 34 <A HREF="api.html">API</A><BR>
Chris@41 35 <A HREF="bugs.html">Bug Reporting</A><BR>
Chris@41 36 <A HREF="win32.html">On Win32</A><BR>
Chris@41 37 <A HREF="faq.html">FAQ</A><BR>
Chris@41 38 <A HREF="lists.html">Mailing Lists</A><BR>
Chris@41 39 <A HREF="ChangeLog">ChangeLog</A><BR>
Chris@41 40 <BR>
Chris@41 41 <DIV CLASS="block">
Chris@41 42 Author :<BR>Erik de Castro Lopo
Chris@41 43 <!-- pepper -->
Chris@41 44 <BR><BR>
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Chris@41 46
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Chris@41 63 <P>
Chris@41 64 <I>
Chris@41 65 "Choosing a sample rate coverter wasn't easy. We ran numerous tests with
Chris@41 66 Secret Rabbit Code and other sample rate converters, then compared them all.
Chris@41 67 In the end, SRC outperformed the others, including some extremely well known
Chris@41 68 and popular software. We had one issue with SRC, but after emailing Erik, he
Chris@41 69 got back to us immediately with an answer. Choosing SRC was a no brainer."
Chris@41 70 </I><BR>
Chris@41 71 Ryan Smith, International Marketing Manager, <BR>
Chris@41 72 <A HREF="http://emersys.co.kr/">Emersys Corp.</A>, South Korea.<BR>
Chris@41 73 Product : <A HREF="http://maven3d.com">Maven3D</A>
Chris@41 74
Chris@41 75 </P>
Chris@41 76 </TD></TR>
Chris@41 77 </TABLE>
Chris@41 78 <P>
Chris@41 79 <B>S</B>ecret <B>R</B>abbit <B>C</B>ode (aka libsamplerate) is a
Chris@41 80 <B>S</B>ample <B>R</B>ate <B>C</B>onverter for audio.
Chris@41 81 One example of where such a thing would be useful is converting audio
Chris@41 82 from the CD sample rate of 44.1kHz to the 48kHz sample rate used by
Chris@41 83 DAT players.
Chris@41 84 </P>
Chris@41 85 <!-- pepper -->
Chris@41 86 <P>
Chris@41 87 <B>SRC</B> is capable of arbitrary and time varying conversions ; from
Chris@41 88 downsampling by a factor of 256 to upsampling by the same factor.
Chris@41 89 Arbitrary in this case means that the ratio of input and output
Chris@41 90 sample rates can be an irrational number.
Chris@41 91 The conversion ratio can also vary with time for speeding up and slowing
Chris@41 92 down effects.
Chris@41 93 </P>
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Chris@41 95 <P>
Chris@41 96 <B>SRC</B> provides a small set of converters to allow quality to
Chris@41 97 be traded off against computation cost.
Chris@41 98 The current best converter provides a signal-to-noise ratio of 145dB
Chris@41 99 with -3dB passband extending from DC to 96&#37; of the theoretical
Chris@41 100 best bandwidth for a given pair of input and output sample rates.
Chris@41 101 </P>
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Chris@41 103 <P>
Chris@41 104 Since the library has few dependencies beyond that provided by the
Chris@41 105 standard C library, it should compile and work on just about any
Chris@41 106 operating system.
Chris@41 107 It is known to work on Linux, MacOSX,
Chris@41 108 <A HREF="win32.html">Win32</A>
Chris@41 109 and Solaris.
Chris@41 110 With some relatively minor hacking it should also be relatively easy
Chris@41 111 to port it to embedded systems and digital signal processors.
Chris@41 112 </P>
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Chris@41 114 <P>
Chris@41 115 In addition, the library comes with a comprehensive test suite which
Chris@41 116 can validate the performance of the library on new platforms.
Chris@41 117 </P>
Chris@41 118
Chris@41 119 <!-- pepper -->
Chris@41 120 <!-- <A HREF="mailto:aldel0305@mega-nerd.com">For the spam bots</A> -->
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