<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Sat, Jun 7, 2014 at 10:58 AM, Andrew Lentvorski <span dir="ltr"><<a href="mailto:bsder@allcaps.org" target="_blank">bsder@allcaps.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class=""><br>
<br>
On 6/7/14, 1:55 AM, Jean-Marc Valin wrote:<br>
> Actually... no! 24-bit can indeed be useful as extra margin and Opus<br>
> can actually represent even more dynamic range than 24-bit PCM. That's<br>
> not the case for 192 kHz. There's no "margin" that 192 kHz buys you<br>
> over 48 kHz. You can do as much linear filtering as you like, the<br>
> stuff above 20 kHz isn't going to help you.<br>
<br>
</div>But lots of effects are not linear--simulating a tube guitar amplifier,<br>
for example.<br>
<br>
Even something as straightforward as resampling a signal to 44.1KHz is<br>
going to benefit from starting at 192KHz rather than 48KHz.<br>
<br>
There may not be more signal information but there will be less noise.<br>
<span class="HOEnZb"><font color="#888888"><br></font></span></blockquote><div><br></div><div>Hello Andrew,</div><div>Do you have any references for me to investigate, I am trying to understand how noise is reduced by introducing higher sampling rates. (I tried to search, but maybe it is so obvious that nobody even explains it)</div>
<div><br></div><div>In resampling - as far as I understand it - you first limit the bandwidth to the 1/2 the sampling rate to prevent aliasing problems.</div><div>If your input signal contains no energy outside the resampled bandwidth to start with, how is this going to increase the signal to noise ratio?</div>
<div><br></div><div>Thanks for your time,</div><div><br></div><div>Edwin van den Oetelaar</div></div></div></div>