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<p class="MsoNormal">That’s nice. However, a simple headset with a boom mounted microphone is a vast improvement over a typical situation.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Even a cheap one from Koss. <a href="https://www.zipdx.info/product-review-koss-cs300-usb-headset/">
https://www.zipdx.info/product-review-koss-cs300-usb-headset/</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have a special service for use by conference interpreters like those who work for the UN. We have to occasionally review headsets to verify reliable, full-duplex performance.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There are some USB audio interface chips that degrade microphone performance while in the presence of incoming sound. It’s a faulty echo cancellation scheme implemented in silicon.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Michael Graves<o:p></o:p></p>
<p class="MsoNormal"><a href="mailto:mgraves@mstvp.com"><span style="color:windowtext">mgraves@mstvp.com</span></a><o:p></o:p></p>
<p class="MsoNormal">o: (713) 861-4005<o:p></o:p></p>
<p class="MsoNormal">c: (713) 201-1262<o:p></o:p></p>
<p class="MsoNormal"><a href="sip:mgraves@mjg.onsip.com">sip:mgraves@mjg.onsip.com</a><o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Mike Hammett <voiceops@ics-il.net> <br>
<b>Sent:</b> Monday, June 14, 2021 5:05 PM<br>
<b>To:</b> mgraves mstvp.com <mgraves@mstvp.com><br>
<b>Cc:</b> voiceops@voiceops.org; Tim Bray <tim@kooky.org><br>
<b>Subject:</b> Re: Call Quality<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">*nods* When in the home office, I use my podcasting setup (headphones, dedicated mic, ran through some software to clean up a bit more.)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><br>
<br>
-----<br>
Mike Hammett<br>
Intelligent Computing Solutions<br>
<a href="http://www.ics-il.com">http://www.ics-il.com</a><br>
<br>
<br>
<br>
Midwest Internet Exchange<br>
<a href="http://www.midwest-ix.com">http://www.midwest-ix.com</a><br>
<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">From:
</span></b><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">"mgraves mstvp.com" <<a href="mailto:mgraves@mstvp.com">mgraves@mstvp.com</a>><br>
<b>To: </b>"Mike Hammett" <<a href="mailto:voiceops@ics-il.net">voiceops@ics-il.net</a>>, "Tim Bray" <<a href="mailto:tim@kooky.org">tim@kooky.org</a>><br>
<b>Cc: </b><a href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a><br>
<b>Sent: </b>Monday, June 14, 2021 4:53:27 PM<br>
<b>Subject: </b>RE: Call Quality<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Working for a conferencing company, we hear all about this.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">You’d think that acoustic echo cancellation was settled science, and you’d be wrong. There are so many bad quality speakerphones and conference phones.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Further, so many software engineers (yes, you Google!) think they have some special insight. Their stuff is just as bad as others. Worse because it can be variable.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Bottom line is, if you must hear and be heard well…when it really matters….use a headset.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Michael Graves<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><a href="mailto:mgraves@mstvp.com" target="_blank"><span style="color:windowtext">mgraves@mstvp.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">o: (713) 861-4005<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">c: (713) 201-1262<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0563C1"><a href="sip:mgraves@mjg.onsip.com">sip:mgraves@mjg.onsip.com</a></span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> VoiceOps <<a href="mailto:voiceops-bounces@voiceops.org">voiceops-bounces@voiceops.org</a>>
<b>On Behalf Of </b>Mike Hammett<br>
<b>Sent:</b> Monday, June 14, 2021 4:46 PM<br>
<b>To:</b> Tim Bray <<a href="mailto:tim@kooky.org">tim@kooky.org</a>><br>
<b>Cc:</b> <a href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a><br>
<b>Subject:</b> Re: [VoiceOps] Call Quality<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">God, I hope customers don't hold their carriers responsible for inappropriate use of speakerphones.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Yes, I'm sure the complaints received for the above are non-null. That's how much faith I have in customers.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><br>
<br>
-----<br>
Mike Hammett<br>
Intelligent Computing Solutions<br>
<a href="http://www.ics-il.com" target="_blank">http://www.ics-il.com</a><br>
<br>
<br>
<br>
Midwest Internet Exchange<br>
<a href="http://www.midwest-ix.com" target="_blank">http://www.midwest-ix.com</a><br>
<br>
</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">From:
</span></b><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">"Tim Bray via VoiceOps" <<a href="mailto:voiceops@voiceops.org" target="_blank">voiceops@voiceops.org</a>><br>
<b>To: </b><a href="mailto:voiceops@voiceops.org" target="_blank">voiceops@voiceops.org</a><br>
<b>Sent: </b>Monday, June 14, 2021 4:36:55 PM<br>
<b>Subject: </b>Re: [VoiceOps] Call Quality<br>
<br>
On 14/06/2021 22:25, Mike Hammett wrote:<br>
> One of the concerns I heard was echo. On a purely digital call, what <br>
> would be the cause of echo?<br>
<br>
Echo, as in hearing yourself coming back with a delay?<br>
<br>
Sound flying from the speaker to the microphone at the far end. Dodgy <br>
speaker phone, poor plastic design of the phone, DSP not doing echo <br>
cancellation. Or too much end to end latency - if it is quick enough, <br>
you don't notice. Could be loads of things.<br>
<br>
<br>
<br>
<br>
Quite often with third party USB or bluetooth `speaker phones`<br>
<br>
<br>
<br>
-- <br>
Tim Bray<br>
Huddersfield, GB<br>
<a href="mailto:tim@kooky.org" target="_blank">tim@kooky.org</a><br>
<br>
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