Archive of the former Yahoo!Groups mailing list: MOTM

----- Original Message -----
From: <simon@...>
To: <motm@yahoogroups.com>
Sent: Saturday, February 07, 2004 12:10 PM
Subject: Re: [motm] Re: MPC4000 sound quality for MOTM


> > I almost always record at 44.1Khz, because my stuff is intended for CD.
> > There is no such thing as a perfect sample rate conversion from 48KHz or
even 96KHz or 192kHz to 44.1kHz.
>
>
> How about recording at 88.2KHz or 176.4KHz, and downsampling to 44.1KHz if
outputting for CD?
>
> How does that sort of sample rate conversion work out, do you still have
the same quality issues with 88.2/176.4 to 44.1 as 48/96/192 to 44.1?
>
>
> Simon
> Canberra
> AUSTRALIA
>
There is no problem downconverting from 88.2Khz or 176.4Khz to 44.1kHz. You
are either using every other sample or every fourth sample. When converting
to lower frequencies that are not from higher integer multiples there must
be some interpolation which is where the error comes in.

I still am not a fan of higher sample rates. Most higher sample rates sound
better because the lowpass filter is at a higher frequency so there are less
phase artifacts in the audible range, not because the sample rate is higher.
IMHO there is no useful information contained in the sound above 20Khz
because you can't hear it. What you don't hear on higher sampling rates is
the high end phase smear caused by the filters in the converters. The
higher rates make the sound seem to have more air or to be crisper, but
again this is just the lack of phase smear.