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Smarc audio rate converter, ...another SR converter developed at TÚlÚcom ParisTech, France.
forart.eu
post Oct 25 2011, 10:50
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QUOTE
Smarc is a fast and high quality audio rate converter. It allows conversion between any samplerate. Smarc is a command-line program and a C library to be integrated in other applications.

Features
  • signal rate conversion between any sample rates.
  • optimized for conversion between standard audio sample rates.
  • command-line tool to convert audio files
  • C library to integrate smarc converter into other applications.
  • Initially designed to convert audio, but also any 1-D signals such as EEG, seismic signals, etc.
  • Convert sample rate using polyphase decimation and interpolation filters. This method guarantees high-quality for upsampling and downsampling.
  • Internal filters can be tuned to emphasize speed or quality.


Official website
Official download page
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Martel
post Oct 25 2011, 19:01
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Well, I've read through the "internals" document (15 pages).

It contains an alarming number of typos. Some parts are still in French.
I did not find anything revolutionary. There seem to be just some speed and memory-related optimizations.

QUOTE
... For others ratios, the decompostion is automatically computed but the result is often not optimal
and a manual help is recommanded, in this way one can manually defined a better decomposition.


This quote from the conclusion is not too convincing. smile.gif

This post has been edited by Martel: Oct 25 2011, 19:02


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klonuo
post Oct 25 2011, 21:15
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Seems good and fast. 2x slower than SoX or zita, but that's still fast IMHO

Swept


1kHz


At 150 dB none artifact

Above images are from default settings. One can use "--rs=180" and get clear picture at almost same speed

This post has been edited by klonuo: Oct 25 2011, 21:35
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lvqcl
post Oct 26 2011, 21:05
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BTW, frequency response (passband) for 96000 -> 44100 conversion (smarc -r 44100 in.wav out.wav):

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klonuo
post Oct 27 2011, 01:50
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Yeah, like default value for stop band is 140, ripple factor is set to 0.1
It seems it can go down to 0.001:


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