Mercurial > hg > sv-dependency-builds
comparison src/libsamplerate-0.1.9/doc/index.html @ 126:4a7071416412
Current libsamplerate source
| author | Chris Cannam <cannam@all-day-breakfast.com> |
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| date | Tue, 18 Oct 2016 13:24:45 +0100 |
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| 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 | |
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| 54 <!-- pepper --> | |
| 55 <!-- ######################################################################## --> | |
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| 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% 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 |