High-frequency hearing in humans ("Brian C. J. Moore" )


Subject: High-frequency hearing in humans
From:    "Brian C. J. Moore"  <bcjm@xxxxxxxx>
Date:    Fri, 4 Feb 2011 16:18:11 +0000
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

<html> <body> Deall All,<br><br> In connection with this thread, I suggest taking a look at:<br><br> <font face="Times New Roman, Times">Ashihara, K. and Kiryu, S. (2000). Influence of expanded frequency band of signals on non-linear characteristics of loudspeakers, <i>J. Acoust. Soc. Jap. (J)</i> <b>56</b>, 549-555.<br> Ashihara, K. and Kiryu, S. (2003). Audibility of components above 22 kHz in a complex tone, <i>Acustica - acta acustica</i> <b>89</b>, 540-546.<br><br> </font>Brian Moore<br><br> <br><br> <br> <blockquote type=cite class=cite cite="">Just to show that it is not a simple question of loudspeaker quality but also of recording quality I send you a Matlab script producing one square wave &quot;sampled&quot; at 48000 and another at 192000 Hz.&nbsp; The difference is audible through any loudspeaker.&nbsp; <br><br> clear all<br> sf1 = 48000;<br> sf2 = 192000;<br> dt1 = 1/sf1;<br> dt2 = 1/sf2;<br> du = 1;<br> f0 = 5000;<br> t1 = 0:dt1:du;<br> t2 = 0:dt2:du;<br> s1 = square(2*pi*f0*t1);<br> s2 = square(2*pi*f0*t2);<br> sound(s1, sf1)<br> wavwrite(s1, sf1, 's48000')<br> pause(1)<br> sound(s2, sf2)<br> wavwrite(s2, sf2, 's192000')<br><br> <br> Best,<br> Dik<br><br> &gt; -----Original Message-----<br> &gt; From: AUDITORY - Research in Auditory Perception<br> &gt; [<a href="mailto:AUDITORY@xxxxxxxx" eudora="autourl"> mailto:AUDITORY@xxxxxxxx</a>] On Behalf Of Joachim Thiemann<br> &gt; Sent: vrijdag 4 februari 2011 15:37<br> &gt; To: AUDITORY@xxxxxxxx<br> &gt; Subject: Re: [AUDITORY] High-frequency hearing in humans<br> &gt; <br> &gt; On Thu, Feb 3, 2011 at 23:08, Kevin Austin &lt;kevin.austin@xxxxxxxx&gt;<br> &gt; wrote:<br> &gt; &gt; A colleague of mine has been working on clicks in an electroacoustics<br> &gt; aural perception course. He discovered that a 48kHz sampling rate was<br> &gt; &quot;too crude&quot;, and that working at 96kHz (or higher), the differences<br> &gt; between clicks over 8kHz were noticeable. This is not quite what<br> &gt; sampling theory seems to say. At 44.1kHz, a single sample click<br> &gt; represents 22kHz, and a two sample click represents 11kHz. How does one<br> &gt; represent a 16kHz click with a 44.1kHz sampling rate?<br> &gt; <br> &gt; I think one has to be careful about the actual D/A hardware in these<br> &gt; cases.&nbsp; Oversampled sigma/delta? R-2R? What are the postfilter<br> &gt; characteristics?&nbsp; I think with these type of stimuli, differences<br> &gt; might be audible: even if the same soundcard is used at different<br> &gt; rates, the filter should change.&nbsp; The differences in filter<br> &gt; characteristics might extend to lower frequencies, where they might be<br> &gt; picked up by individuals with good hearing.<br> &gt; <br> &gt; Joe.<br> &gt; <br> &gt; --<br> &gt; Joachim Thiemann :: <a href="http://www.tsp.ece.mcgill.ca/~jthiem" eudora="autourl"> http://www.tsp.ece.mcgill.ca/~jthiem</a></blockquote></body> <br> <div>Brian C. J. Moore, Ph.D, FMedSci, FRS,</div> <div>Professor of Auditory Perception,</div> <div>Department of Experimental Psychology,</div> <div>University of Cambridge,</div> <div>Downing Street,</div> <div>Cambridge CB2 3EB,</div> <div>UK</div> <div>Tel. +44 (0) 1223 333574</div> <div>Fax. +44 (0) 1223 333564</div> <div><a href="http://hearing.psychol.cam.ac.uk/" EUDORA=AUTOURL> http://hearing.psychol.cam.ac.uk</a></div> <br> </html>


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