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annotate src/libsamplerate-0.1.8/doc/index.html @ 23:619f715526df sv_v2.1

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Update Vamp plugin SDK to 2.5
author Chris Cannam
date Thu, 09 May 2013 10:52:46 +0100
parents c7265573341e
children
rev   line source
Chris@0 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
Chris@0 2 <HTML>
Chris@0 3
Chris@0 4 <HEAD>
Chris@0 5 <TITLE>
Chris@0 6 Secret Rabbit Code (aka libsamplerate)
Chris@0 7 </TITLE>
Chris@0 8 <META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)">
Chris@0 9 <META NAME="Version" CONTENT="libsamplerate-0.1.8">
Chris@0 10 <META NAME="Description" CONTENT="The Secret Rabbit Code Home Page">
Chris@0 11 <META NAME="Keywords" CONTENT="libsamplerate sound resample audio dsp Linux">
Chris@0 12 <LINK REL=StyleSheet HREF="SRC.css" TYPE="text/css" MEDIA="all">
Chris@0 13 </HEAD>
Chris@0 14
Chris@0 15 <BODY TEXT="#FFFFFF" BGCOLOR="#000000" LINK="#FB1465" VLINK="#FB1465" ALINK="#FB1465">
Chris@0 16 <!-- pepper -->
Chris@0 17 <CENTER>
Chris@0 18 <IMG SRC="SRC.png" HEIGHT=100 WIDTH=760 ALT="SRC.png">
Chris@0 19 </CENTER>
Chris@0 20 <!-- pepper -->
Chris@0 21 <BR>
Chris@0 22 <!-- pepper -->
Chris@0 23 <TABLE ALIGN="center" WIDTH="98%">
Chris@0 24 <TR>
Chris@0 25 <TD VALIGN="top">
Chris@0 26 <BR>
Chris@0 27 <DIV CLASS="nav">
Chris@0 28 <BR>
Chris@0 29 <A HREF="index.html">Home</A><BR>
Chris@0 30 <A HREF="license.html">License</A><BR>
Chris@0 31 <A HREF="history.html">History</A><BR>
Chris@0 32 <A HREF="download.html">Download</A><BR>
Chris@0 33 <A HREF="quality.html">Quality</A><BR>
Chris@0 34 <A HREF="api.html">API</A><BR>
Chris@0 35 <A HREF="bugs.html">Bug Reporting</A><BR>
Chris@0 36 <A HREF="win32.html">On Win32</A><BR>
Chris@0 37 <A HREF="faq.html">FAQ</A><BR>
Chris@0 38 <A HREF="lists.html">Mailing Lists</A><BR>
Chris@0 39 <A HREF="ChangeLog">ChangeLog</A><BR>
Chris@0 40 <A HREF="fb2k.html">Foobar 2k</A><BR>
Chris@0 41 <BR>
Chris@0 42 <DIV CLASS="block">
Chris@0 43 Author :<BR>Erik de Castro Lopo
Chris@0 44 <!-- pepper -->
Chris@0 45 <BR><BR>
Chris@0 46 <!-- pepper -->
Chris@0 47
Chris@0 48 </DIV>
Chris@0 49 <IMG SRC=
Chris@0 50 "/cgi-bin/Count.cgi?ft=6|frgb=55;55;55|tr=0|md=6|dd=B|st=1|sh=1|df=src.dat"
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Chris@0 52 </DIV>
Chris@0 53
Chris@0 54 </TD>
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Chris@0 58 <TD VALIGN="top">
Chris@0 59 <DIV CLASS="block">
Chris@0 60 <BR>
Chris@0 61
Chris@0 62 <TABLE ALIGN="center" WIDTH="80%">
Chris@0 63 <TR><TD>
Chris@0 64 <P>
Chris@0 65 <I>
Chris@0 66 "Choosing a sample rate coverter wasn't easy. We ran numerous tests with
Chris@0 67 Secret Rabbit Code and other sample rate converters, then compared them all.
Chris@0 68 In the end, SRC outperformed the others, including some extremely well known
Chris@0 69 and popular software. We had one issue with SRC, but after emailing Erik, he
Chris@0 70 got back to us immediately with an answer. Choosing SRC was a no brainer."
Chris@0 71 </I><BR>
Chris@0 72 Ryan Smith, International Marketing Manager, <BR>
Chris@0 73 <A HREF="http://emersys.co.kr/">Emersys Corp.</A>, South Korea.<BR>
Chris@0 74 Product : <A HREF="http://maven3d.com">Maven3D</A>
Chris@0 75
Chris@0 76 </P>
Chris@0 77 </TD></TR>
Chris@0 78 </TABLE>
Chris@0 79 <P>
Chris@0 80 <B>S</B>ecret <B>R</B>abbit <B>C</B>ode (aka libsamplerate) is a
Chris@0 81 <B>S</B>ample <B>R</B>ate <B>C</B>onverter for audio.
Chris@0 82 One example of where such a thing would be useful is converting audio
Chris@0 83 from the CD sample rate of 44.1kHz to the 48kHz sample rate used by
Chris@0 84 DAT players.
Chris@0 85 </P>
Chris@0 86 <!-- pepper -->
Chris@0 87 <P>
Chris@0 88 <B>SRC</B> is capable of arbitrary and time varying conversions ; from
Chris@0 89 downsampling by a factor of 256 to upsampling by the same factor.
Chris@0 90 Arbitrary in this case means that the ratio of input and output
Chris@0 91 sample rates can be an irrational number.
Chris@0 92 The conversion ratio can also vary with time for speeding up and slowing
Chris@0 93 down effects.
Chris@0 94 </P>
Chris@0 95 <!-- pepper -->
Chris@0 96 <P>
Chris@0 97 <B>SRC</B> provides a small set of converters to allow quality to
Chris@0 98 be traded off against computation cost.
Chris@0 99 The current best converter provides a signal-to-noise ratio of 145dB
Chris@0 100 with -3dB passband extending from DC to 96&#37; of the theoretical
Chris@0 101 best bandwidth for a given pair of input and output sample rates.
Chris@0 102 </P>
Chris@0 103 <!-- pepper -->
Chris@0 104 <P>
Chris@0 105 Since the library has few dependencies beyond that provided by the
Chris@0 106 standard C library, it should compile and work on just about any
Chris@0 107 operating system.
Chris@0 108 It is known to work on Linux, MacOSX,
Chris@0 109 <A HREF="win32.html">Win32</A>
Chris@0 110 and Solaris.
Chris@0 111 With some relatively minor hacking it should also be relatively easy
Chris@0 112 to port it to embedded systems and digital signal processors.
Chris@0 113 </P>
Chris@0 114 <!-- pepper -->
Chris@0 115 <P>
Chris@0 116 In addition, the library comes with a comprehensive test suite which
Chris@0 117 can validate the performance of the library on new platforms.
Chris@0 118 </P>
Chris@0 119
Chris@0 120 <!-- pepper -->
Chris@0 121 <!-- <A HREF="mailto:aldel0305@mega-nerd.com">For the spam bots</A> -->
Chris@0 122 <!-- pepper -->
Chris@0 123
Chris@0 124 </DIV>
Chris@0 125 </TD></TR>
Chris@0 126 </TABLE>
Chris@0 127
Chris@0 128 </BODY>
Chris@0 129 </HTML>
Chris@0 130