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1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
2 | <HTML> | |
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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> | |
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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 | |
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44 | <BR><BR> | |
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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" | |
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55 | <!-- ######################################################################## --> | |
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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% 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> --> | |
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122 | ||
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