Subject: Quantifying duration of musical notes From: Michael Schutz <mrs8q@xxxxxxxx> Date: Wed, 15 Feb 2006 22:41:45 -0500--Apple-Mail-142-692832125 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Auditory List, I am almost finished with a project exploring sensory integration in musical contexts, which shows that musicians can use visual (gesture) information to alter the perception of note length. As part of my findings, I would like to discuss differences the actual (acoustic) lengths of the notes used. It is very clear from looking at basic plots of the sound energy over time that certain notes are acoustically longer than other notes. These (currently unquantified) intuitions are closely reflected in the perceptual ratings I obtained from subjects in my experiment. However I would like to have some way of analyzing the acoustic information to lend credibility to my discuss of the discrepancies between acoustic and perceptual duration ratings. The problem breaks down to this: I have 3 categories of pitches (high, medium, and low pitches). Within each category of pitches I have 3 types of notes (long, medium, and short). I would like to be able to examine the acoustic differences between the 3 notes within each pitch level in order to conclude which (if any) notes are longer. I have a data file with the RMS Amplitude from note onset to note decay, sampled every 10 milliseconds. Originally, I envisioned this experiment to examine only the perceptual aspects of note duration, however given my results I think it would be much better to also include a brief section on the acoustic analysis of note duration. My background is in perceptual research rather than acoustics, so I would greatly appreciate any thoughts on the proper way of pursuing this issue. Thanks, Michael Schutz Michael Schutz University of Virginia B045 Gilmer Hall (434) 243-5534 schutz@xxxxxxxx --Apple-Mail-142-692832125 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 <HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; = -khtml-line-break: after-white-space; "><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Auditory = List,</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; "><SPAN class=3D"Apple-tab-span" = style=3D"white-space:pre"> </SPAN>I am almost finished with a = project exploring sensory integration in musical contexts, which shows = that musicians can use visual (gesture) information to alter the = perception of note length.=A0 As part of my findings, I would like to = discuss differences the actual (acoustic) lengths of the notes used.=A0 = It is very clear from looking at basic plots of the sound energy over = time that certain notes are acoustically longer than other notes.=A0 = These (currently unquantified) intuitions are closely reflected in the = perceptual ratings I obtained from subjects in my experiment.=A0 However = I would like to have some way of analyzing the acoustic information to = lend credibility to my discuss of the discrepancies between acoustic and = perceptual duration ratings.</DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN = class=3D"Apple-tab-span" style=3D"white-space:pre"> </SPAN>The = problem breaks down to this:=A0 I have 3 categories of pitches (high, = medium, and low pitches).=A0 Within each category of pitches I have 3 = types of notes (long, medium, and short).=A0 I would like to be able to = examine the acoustic differences between the 3 notes within each pitch = level in order to conclude which (if any) notes are longer.=A0 I have a = data file with the RMS Amplitude from note onset to note decay, sampled = every 10 milliseconds.</DIV><DIV style=3D"margin-top: 0px; margin-right: = 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN = class=3D"Apple-tab-span" style=3D"white-space:pre"> = </SPAN>Originally, I envisioned this experiment to examine only the = perceptual aspects of note duration, however given my results I think it = would be much better to also include a brief section on the acoustic = analysis of note duration.</DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: = 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; ">My background is in perceptual = research rather than acoustics, so I would greatly appreciate any = thoughts on the proper way of pursuing this issue.</DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: = 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; = ">Thanks,</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">Michael Schutz</DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><BR = class=3D"khtml-block-placeholder"></DIV><BR><DIV> <P style=3D"margin: = 0.0px 0.0px 0.0px 0.0px"><FONT face=3D"Helvetica" size=3D"3" = style=3D"font: 12.0px Helvetica"><I>Michael Schutz</I></FONT></P> <P = style=3D"margin: 0.0px 0.0px 0.0px 0.0px"><FONT face=3D"Helvetica" = size=3D"3" style=3D"font: 12.0px Helvetica"><I>University of = Virginia</I></FONT></P> <P style=3D"margin: 0.0px 0.0px 0.0px = 0.0px"><FONT face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px = Helvetica"><I>B045 Gilmer Hall</I></FONT></P> <P style=3D"margin: 0.0px = 0.0px 0.0px 0.0px"><FONT face=3D"Helvetica" size=3D"3" style=3D"font: = 12.0px Helvetica"><I>(434) 243-5534</I></FONT></P> <P style=3D"margin: = 0.0px 0.0px 0.0px 0.0px"><FONT face=3D"Helvetica" size=3D"3" = style=3D"font: 12.0px Helvetica"><I><A = href=3D"mailto:schutz@xxxxxxxx">schutz@xxxxxxxx</A></I></FONT></P>= </DIV><BR></BODY></HTML>= --Apple-Mail-142-692832125--