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In Reply to: Re: Good news: how to convert your Quad albums to DVD-A! posted by Martin419 on August 14, 2006 at 03:10:10:
I suspect by GCD you are talking about an SSRC implementation to convert from sampling rate m to sampling rate n by first upsampling m to gcd(m,n) by zero insertion, apply the anti alias filter at m, and then decimate by taking only output samples at the rate of n?If you are, then yes, this is the classic approach to resampling, but is computationally very expensive (esp. for 44.1 to 48). There are now much better ASRC algorithms that arguably do as good a job (or even better) but less computationally intensive.
Even if the "classic" (or "GCD" as you call it) approach is used, it does not guarantee a good result. As an example, Samplitude uses the "GCD approach" that you describe (zero insertion, filter, decimate) in "Ultra High Quality" mode but unfortunately the results are not fantastic, with artefacts such as rippling in the passband and an early cutoff well before Nyquist. I suspect their filter implementation isn't very good.
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Follow Ups
- Sorry - just realised i never really answered your question - Christine Tham 18:38:28 08/15/06 (0)
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