Recording and Acquisition : Importing Audio Files into Pyramix Virtual Studio
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3. Selecting Properties opens the MT Hepta SRC module Properties dialog:
4. Choose the required target sample rate by clicking on the Output SR down arrow to drop-down the list of all
available Sample Rates.
5. Filter Type offers the choice of Lin. Phase, Min Phase or Apodising.
• Linear Phase features constant group delay, thanks to the linear phase, and has a symmetric impulse
response, but also longer rings. This offers the best preservation of stereo image. There will be a minimum
of phase distortion from the anti-aliasing filter.
• Minimum Phase features an asymmetric impulse response with minimum phase response. This gives the
lowest amount of phase variation along the frequency spectrum and allows slightly better results for tran-
sient sounds.
• Apodizing offers the steepest response around the Nyquist point and linear phase. It offers the best of
both worlds for the about the same computational effort as the 2 other designs. There is a steep transition
band in the LPF filter using an almost linear phase. Arguably this is the best compromise between linear
and minimum phase types
MT Hepta SRC module Properties dialog
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