libsamplerate/doc/index.html

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