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More => Old Versions => JRiver Media Center 23 for Windows => Topic started by: pschelbert on February 01, 2018, 09:19:42 am

Title: Resample characteristic? (standard resample)
Post by: pschelbert on February 01, 2018, 09:19:42 am

Hi

I am wondering what the implemented resample characteristic is.
This concerns mainly the anti-aliasing filter which is part of the resample algorithm.
Main application is CD (44.1kHz) upsample to 96kHz to be on par with 96kHz DVD-A
44.1kHz to any other samplerate (96khz etc.)

Anti-Aliasing filter rolloff-characteristic:
1) passband
2) stopband
3) slope
4) ripple-passband
5) ripple stopband
6) phase (linear, minphase, mixed-phase etc.)

Peter

Title: Re: Resample characteristic? (standard resample)
Post by: pschelbert on February 02, 2018, 06:09:57 am

Hi

as the resample solution is Sox, the question can be drilled down to the question which parameters are choosen:
http://sox.sourceforge.net/SoX/Resampling
1) SoX 14.4 High Quality:   No options (this is the default setting)
2) SoX 14.4 High Quality (Aliasing Enabled):   -b 90 -a
3) SoX 14.4 VHQ Linear Phase:   -v -s
4) SoX 14.4 VHQ Intermediate Phase:   -v -s -I
5) SoX 14.4 VHQ Minimum Phase:   -v -s -M

or others.

Peter

Title: Re: Resample characteristic? (standard resample)
Post by: Hendrik on February 02, 2018, 08:22:42 am

We use Linear Phase, VHQ and a Steep Filter.

Title: Re: Resample characteristic? (standard resample)
Post by: pschelbert on February 02, 2018, 08:31:15 am

Hi

would be therefore:
3) SoX 14.4 VHQ Linear Phase:   -v -s

right?

Peter