Subject: Re: Sound card problems (UNCLASSIFIED) From: Jaime Undurraga Lucero <jaime.undurraga@xxxxxxxx> Date: Mon, 11 Aug 2008 13:01:43 +0200 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>------=_Part_73412_13865314.1218452503691 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline I found this surfing on Internet to complement some points, http://dot.cult.bg/esem/?p=50 Kind Regards, Jaime On Fri, Aug 8, 2008 at 8:52 PM, Hairston, W. Dave (Cont, ARL/HRED) < dave.hairston@xxxxxxxx> wrote: > Classification: UNCLASSIFIED > Caveats: NONE > > Hi Rahul, > > First of all - USB based sound cards are notoriously terrible for temporal > accuracy. Your best bet really is to get an PCMCIA-based card. > The reason is, the data bus of the USB is not all that fast - it's high > bandwidth, but has a slow sample rate - default is only 125 Hz. > This means you can only "deliver" a sound to begin roughly every 7.5 ms... > So if the sound delivery from the hsystem does not line up appropriately, > you will have a gap while it "waits" to sync w/ the USB data bus. > > Now there is hope! > In Windows, you CAN change the USB sample rate, using an applet. > This one here will do it: > > http://www.softpedia.com/get/Tweak/System-Tweak/USB-Mouserate-switcher.shtml > > It allows changing the data rate up to 1000 Hz (1 ms resolution). > > Note - this changes the access rate for ALL USB devices; mice, remote > drives, access keys, etc. It may also decrease the time you get out of the > battery, due to larger power consumption. > > IMO, spend the $$ on a good PCMCIA card and be done with it. > > Good luck, > Dave > > > > ------------------------------- > Dr. W. David Hairston > Research Fellow > Oak Ridge Affiliated Universities > > Auditory Research Team, VAP, HRED > Army Research Lab > Aberdeen Proving Ground, MD 21005 > > Office: (410) 278-5925 > Fax: (410) 278-3587 > > > > -----Original Message----- > From: AUDITORY - Research in Auditory Perception > [mailto:AUDITORY@xxxxxxxx On Behalf Of Shrivastav,Rahul > Sent: Friday, August 08, 2008 2:22 PM > To: AUDITORY@xxxxxxxx > Subject: [AUDITORY] Sound card problems > > Folks - I wonder if someone on this list can help us with a problem we are > having with our sound card: > > > > We purchased a Creative E-MU 0202 USB sound card to use with a laptop. > Unfortunately, when we play wav files through this sound card, they > occasionally skip for a few milliseconds. The skipping occurs at random > intervals and does not seem related to the file size. The problem does not > occur if we play the same sound file through the internal soundcard on the > same laptop. We have already done most of the usual troubleshooting steps - > update/reinstall drivers, used both USB 1 and USB 2 ports, etc. - but none > seem to have worked. > > > > Has anyone observed such a problem before? Any solutions that you can > suggest? > > > > Also, do you have another "favorite" amongst external sound cards? We want > to use it to run some speech tests in the field. > > > > Thanks for all your help! > > > > Rahul > > > > > > ----------------------- > > Rahul Shrivastav, Ph.D. > > Associate Professor > > Dept. of Communication Sciences and Disorders > > Dauer Hall, PO Box 117420 > > University of Florida > > Gainesville, FL 32611 > > > > Phone: ++-1-(352)-392-2113 (ext. 230) > > Fax: ++-1-(352)-846-0243 > > ----------------------- > > > > Classification: UNCLASSIFIED > Caveats: NONE > > -- Jaime Undurraga, Eng Pre-Doctoral Student ExpORL, Dept. Neurosciences Katholieke Universiteit Leuven Herestraat 49, bus 721 3000 Leuven, Belgium Tel: +32 16 330485 Fax: +32 16 330486 _____________________________________________________ http://jaime.undurraga.googlepages.com ------=_Part_73412_13865314.1218452503691 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline <div dir="ltr">I found this surfing on Internet to complement some points, <br><br><a href="http://dot.cult.bg/esem/?p=50">http://dot.cult.bg/esem/?p=50</a><br><br>Kind Regards,<br>Jaime<br><br><br><div class="gmail_quote"> On Fri, Aug 8, 2008 at 8:52 PM, Hairston, W. Dave (Cont, ARL/HRED) <span dir="ltr"><<a href="mailto:dave.hairston@xxxxxxxx">dave.hairston@xxxxxxxx</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;"> Classification: UNCLASSIFIED<br> Caveats: NONE<br> <br> Hi Rahul,<br> <br> First of all - USB based sound cards are notoriously terrible for temporal<br> accuracy. Your best bet really is to get an PCMCIA-based card.<br> The reason is, the data bus of the USB is not all that fast - it's high<br> bandwidth, but has a slow sample rate - default is only 125 Hz.<br> This means you can only "deliver" a sound to begin roughly every 7.5 ms...<br> So if the sound delivery from the hsystem does not line up appropriately,<br> you will have a gap while it "waits" to sync w/ the USB data bus.<br> <br> Now there is hope!<br> In Windows, you CAN change the USB sample rate, using an applet.<br> This one here will do it:<br> <a href="http://www.softpedia.com/get/Tweak/System-Tweak/USB-Mouserate-switcher.shtml" target="_blank">http://www.softpedia.com/get/Tweak/System-Tweak/USB-Mouserate-switcher.shtml</a><br> <br> It allows changing the data rate up to 1000 Hz (1 ms resolution).<br> <br> Note - this changes the access rate for ALL USB devices; mice, remote<br> drives, access keys, etc. It may also decrease the time you get out of the<br> battery, due to larger power consumption.<br> <br> IMO, spend the $$ on a good PCMCIA card and be done with it.<br> <br> Good luck,<br> Dave<br> <br> <br> <br> -------------------------------<br> Dr. W. David Hairston<br> Research Fellow<br> Oak Ridge Affiliated Universities<br> <br> Auditory Research Team, VAP, HRED<br> Army Research Lab<br> Aberdeen Proving Ground, MD 21005<br> <br> Office: (410) 278-5925<br> Fax: (410) 278-3587<br> <br> <br> <br> -----Original Message-----<br> From: AUDITORY - Research in Auditory Perception<br> [mailto:<a href="mailto:AUDITORY@xxxxxxxx">AUDITORY@xxxxxxxx</a>] On Behalf Of Shrivastav,Rahul<br> Sent: Friday, August 08, 2008 2:22 PM<br> To: <a href="mailto:AUDITORY@xxxxxxxx">AUDITORY@xxxxxxxx</a><br> Subject: [AUDITORY] Sound card problems<br> <br> Folks - I wonder if someone on this list can help us with a problem we are<br> having with our sound card:<br> <br> <br> <br> We purchased a Creative E-MU 0202 USB sound card to use with a laptop.<br> Unfortunately, when we play wav files through this sound card, they<br> occasionally skip for a few milliseconds. The skipping occurs at random<br> intervals and does not seem related to the file size. The problem does not<br> occur if we play the same sound file through the internal soundcard on the<br> same laptop. We have already done most of the usual troubleshooting steps -<br> update/reinstall drivers, used both USB 1 and USB 2 ports, etc. - but none<br> seem to have worked.<br> <br> <br> <br> Has anyone observed such a problem before? Any solutions that you can<br> suggest?<br> <br> <br> <br> Also, do you have another "favorite" amongst external sound cards? We want<br> to use it to run some speech tests in the field.<br> <br> <br> <br> Thanks for all your help!<br> <br> <br> <br> Rahul<br> <br> <br> <br> <br> <br> -----------------------<br> <br> Rahul Shrivastav, Ph.D.<br> <br> Associate Professor<br> <br> Dept. of Communication Sciences and Disorders<br> <br> Dauer Hall, PO Box 117420<br> <br> University of Florida<br> <br> Gainesville, FL 32611<br> <br> <br> <br> Phone: ++-1-(352)-392-2113 (ext. 230)<br> <br> Fax: ++-1-(352)-846-0243<br> <br> -----------------------<br> <br> <br> <br> Classification: UNCLASSIFIED<br> Caveats: NONE<br> <br> </blockquote></div><br><br clear="all"><br>-- <br>Jaime Undurraga, Eng<br>Pre-Doctoral Student<br>ExpORL, Dept. Neurosciences <br>Katholieke Universiteit Leuven <br>Herestraat 49, bus 721<br>3000 Leuven, Belgium<br>Tel: +32 16 330485<br> Fax: +32 16 330486<br>_____________________________________________________<br><a href="http://jaime.undurraga.googlepages.com">http://jaime.undurraga.googlepages.com</a><br> </div> ------=_Part_73412_13865314.1218452503691--