<br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Jochen Kilian</b> <span dir="ltr"><<a href="mailto:jochen.kilian@gmail.com">jochen.kilian@gmail.com</a>></span><br>
Date: 2010/8/18<br>Subject: Re: [CELT-dev] Total Harmonic Distortion THD<br>To: Jean-Marc Valin <<a href="mailto:jean-marc.valin@usherbrooke.ca">jean-marc.valin@usherbrooke.ca</a>><br><br><br>Hi,<div><br></div><div>
Thanks for the clarification, understood.</div><div><br></div><div>So the only measure we have is the perceptual audio quality?</div><div>Which are the most recent comparisons you have.</div><div>Looking at the celt_euspico report I wonder if the comparison was made with the </div>
<div>- low complexity version or not</div><div>- fixed point version or not</div><div><br></div><div>if not are there major differences in quality for the low complexity and the fixed point version?</div><div><br></div><div>
Another question I have is if you ever compared the Codec to the APT-X codec which is used for Bluetooth wireless headsets.</div><div><br></div><div>Thanks</div><div>Jochen</div><div><br><br><div class="gmail_quote">2010/8/18 Jean-Marc Valin <span dir="ltr"><<a href="mailto:jean-marc.valin@usherbrooke.ca" target="_blank">jean-marc.valin@usherbrooke.ca</a>></span><div>
<div></div><div class="h5"><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
Measurements like THD (along with SNR and frequency response) belong to the analog world. They are not adequate for describing most forms of digital processing -- and especially not codecs. What you want is perceptual quality tests -- that's all that matters.<br>
<br>
Cheers,<br>
<br>
Jean-Marc<div><div></div><div><br>
<br>
On 10-08-17 09:26 AM, Jochen Kilian wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div>
Hi<br>
<br>
Has anybody done THD or THD-N measurements with the CELT Codec (bext<br>
would be on various bit rates)<br>
If someone could share results for Mono@64kBit and Stereo@128 and<br>
196kBit it would be great.<br>
<br>
thank you very much<br>
Jochen<br>
<br>
<br>
<br></div></div>
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