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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)">
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- Author :<BR>Erik de Castro Lopo
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- <I>
- "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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