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| Secret Rabbit Code (aka libsamplerate) |
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| <META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)"> |
| <META NAME="Version" CONTENT="libsamplerate-0.1.8"> |
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| Author :<BR>Erik de Castro Lopo |
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| "Choosing a sample rate coverter wasn't easy. We ran numerous tests with |
| Secret Rabbit Code and other sample rate converters, then compared them all. |
| In the end, SRC outperformed the others, including some extremely well known |
| and popular software. We had one issue with SRC, but after emailing Erik, he |
| got back to us immediately with an answer. Choosing SRC was a no brainer." |
| </I><BR> |
| Ryan Smith, International Marketing Manager, <BR> |
| <A HREF="http://emersys.co.kr/">Emersys Corp.</A>, South Korea.<BR> |
| Product : <A HREF="http://maven3d.com">Maven3D</A> |
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| <B>S</B>ecret <B>R</B>abbit <B>C</B>ode (aka libsamplerate) is a |
| <B>S</B>ample <B>R</B>ate <B>C</B>onverter for audio. |
| One example of where such a thing would be useful is converting audio |
| from the CD sample rate of 44.1kHz to the 48kHz sample rate used by |
| DAT players. |
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| <B>SRC</B> is capable of arbitrary and time varying conversions ; from |
| downsampling by a factor of 256 to upsampling by the same factor. |
| Arbitrary in this case means that the ratio of input and output |
| sample rates can be an irrational number. |
| The conversion ratio can also vary with time for speeding up and slowing |
| down effects. |
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| <B>SRC</B> provides a small set of converters to allow quality to |
| be traded off against computation cost. |
| The current best converter provides a signal-to-noise ratio of 145dB |
| with -3dB passband extending from DC to 96% of the theoretical |
| best bandwidth for a given pair of input and output sample rates. |
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| Since the library has few dependencies beyond that provided by the |
| standard C library, it should compile and work on just about any |
| operating system. |
| It is known to work on Linux, MacOSX, |
| <A HREF="win32.html">Win32</A> |
| and Solaris. |
| With some relatively minor hacking it should also be relatively easy |
| to port it to embedded systems and digital signal processors. |
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| In addition, the library comes with a comprehensive test suite which |
| can validate the performance of the library on new platforms. |
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