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jizyjuice
Joined: 28 Nov 2006
Posts: 3
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 24 Jun 2008 5:54 Best method for audio sample rate conversion |
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Hi,
I was wondering what the "best" way to do upsampling/downsampling for audio rates would be? By best I mean computationally efficient. I was thinking just a lookup table and using sinc interpolation would be easiest, but any thoughts or suggestions would be appreciated.
Thanks
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FvM
Joined: 22 Jan 2008
Posts: 2476
Helped: 408
Location: Bochum, Germany
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| 24 Jun 2008 8:07 Re: Best method for audio sample rate conversion |
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| Rate conversion is an extensive topic in signal processing. Particularly downconversion is critical, cause filtering is necessary to prevent aliasing. Generally, CIC-filters are a computationally efficient method for rate conversion. But for downconversion of signals up to nyquist frequency, they have probably too much attenuation. E. g. Uwe Meyer-Baese DSP in FPGA gives a good overview on rate conversion designs.
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fontp
Joined: 19 Nov 2004
Posts: 98
Helped: 13
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| 28 Jun 2008 13:30 Best method for audio sample rate conversion |
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May be interpolation is the easiest way but not the "best"
One more posibility is multirate filtering.
Look at sampling conversion programs
http://www.mds.com/download/filterdesign.asp
and tutorial
http://www.mds.com/support/applicationnotes.asp
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