48 kHz and 44 kHz upsample/conversion

[Tim]

Ok so 44 kHz sample rate really is the industry standard in digital. Prior to HDtracks, Acoustic Sounds and other HiRez download sites, only DVD audio was out there with a multiple of 48 kHz being at 96 kHz. So with almost all DAC's out there today, they still seem to be multiples of 48 kHz. So if one is to upsample's a 44 kHz sample to 96 kHz, that is an uneven multiple of 2.18. Is this digital difference of any consequence if one is upsampling from a base 44 to base 48 or 48 to 44?

 

[amirm]

Depends on what is doing the sample rate conversion. Best is to use a "bit exact" audio path so that the native sample rate is used in the hardware/DAC. This would call for using "WASAPI" or "ASIO" and appropriate audio player that supports it.

 

[gvl]

Unclear what the question is about. Internally DACs tend to upsample using a whole multiplier, so given 44.1 it will be for example upsampled to 88.2, and 48 will be upsampled to 96, or more likely using 8x multiplier to 352.8 or 384. If you upsample externally you can upsample to whatever samplng frequency you want. Using a whole multiplier is better but modern resampling algorithms are pretty good at upsampling to any Fs.

 

[mansr]

Upsampling by an integer factor is easier to implement. Fractional factors require a polyphase filter which is somewhat more complex. Integer or not has no bearing on the quality.