if everyone has such good ideas on how to improve it, I can't wait to see the patch.<br><br><br><div class="gmail_quote">On Tue, Apr 7, 2009 at 9:42 AM, seven du <span dir="ltr"><<a href="mailto:seven@idapted.com">seven@idapted.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">And, actually the value to be normalized is 32bit and which generally<br>
is a sum of two 16bit values( read and write ), so it's probably easy<br>
to exceed 32767 if both end speaking at the same time.<br>
<div><div></div><div class="h5"><br>
On Apr 7, 2009, at 12:15 PM, Nic Bellamy wrote:<br>
<br>
> Anthony Minessale wrote:<br>
>> 2) the macro is designed to fight clipping:<br>
>> When a sample exceeds the max size of the datatype we set it to<br>
>> the max value then cut the volume in half of that sample so it does<br>
>> not make too much noise. if we divide everything by 2 then all the<br>
>> volume would be reduced even on samples that fell inside the proper<br>
>> range.<br>
> Hi Anthony, all,<br>
> this is, in my opinion, actually going to give you far far uglier<br>
> audio artefacts than simply hard limiting the samples. Rather than try<br>
> and describe the resulting distortion, it's easier to just listen to<br>
> it<br>
> in action...<br>
><br>
> Each of the following files is about 100kb.<br>
><br>
> Original file (extracted from<br>
> freeswitch-sounds-en-us-callie-8000-1.0.7.tar.gz):<br>
> <a href="http://www.vadacom.co.nz/engineering/ivr-sample_submenu.wav" target="_blank">http://www.vadacom.co.nz/engineering/ivr-sample_submenu.wav</a><br>
><br>
><br>
> After 30dB gain and hard limiting samples to between -32768 and 32767:<br>
> <a href="http://www.vadacom.co.nz/engineering/ivr-sample_submenu-" target="_blank">http://www.vadacom.co.nz/engineering/ivr-sample_submenu-</a><br>
> hardlimited.wav<br>
><br>
><br>
> After 30dB gain and switch_normalize_to_16bit():<br>
> <a href="http://www.vadacom.co.nz/engineering/ivr-sample_submenu-switch_normalize_to_16bit.wav" target="_blank">http://www.vadacom.co.nz/engineering/ivr-sample_submenu-switch_normalize_to_16bit.wav</a><br>
><br>
><br>
> Cheers,<br>
> Nic.<br>
><br>
> --<br>
> Nic Bellamy,<br>
> Head Of Engineering, Vadacom Ltd - <a href="http://www.vadacom.co.nz/" target="_blank">http://www.vadacom.co.nz/</a><br>
><br>
><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Anthony Minessale II<br><br>FreeSWITCH <a href="http://www.freeswitch.org/">http://www.freeswitch.org/</a><br>ClueCon <a href="http://www.cluecon.com/">http://www.cluecon.com/</a><br>
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