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6 Secret Rabbit Code (aka libsamplerate)
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42 Author :
<BR>Erik de Castro Lopo
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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."
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>
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
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
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.
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
107 It is known to work on Linux, MacOSX,
108 <A HREF=
"win32.html">Win32
</A>
110 With some relatively minor hacking it should also be relatively easy
111 to port it to embedded systems and digital signal processors.
115 In addition, the library comes with a comprehensive test suite which
116 can validate the performance of the library on new platforms.
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