Subject: Re: Physics of the sound of footsteps From: Luca Turchet <turchet.luca@xxxxxxxx> Date: Thu, 23 Jan 2014 12:27:59 +0100 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--bcaec51b2029a6442f04f0a18857 Content-Type: text/plain; charset=ISO-8859-1 Hi Linda, Bruno definitively suggested you the relevant literature. You might be interested also in my project "Audio-haptic walking simulations for virtual reality, entertainment and rehabilitation applications", which is basically a follow up of the NIW project mentioned before. I am using synthesis techniques based on physical and physically-inspired models to simulate footstep sounds produced by different grounds, shoe types, walkers with different anthropomorphic features, and different types of foot-floor interactions. Have a look to http://www.ahws-project.net/ Thanks a lot Victor for sharing that interesting link. Does any of you know if there is any study on the bone conduction occurring during walking? The topic is very interesting to me. For example perceptual effects might arise when providing through headphones the interactive simulation of a foostep on a ground different from that the walker is trampling on. Indeed, maybe beside to a semantic or temporal conflict between the auditory and the haptic sensory information during the integration of the two stimuli, there might be also a conflict between the auditory information arriving through the air and the bones. Any useful information about this topic would be very appreciated. If someone of you is interested in starting a collaboration to investigate such a topic using the technology I am developing please contact me. Best Luca -- --------------------------------------------------------------- www.lucaturchet.it "Music is a moral law: It gives a soul to the Universe, wings to the mind, flight to the imagination, a charm to sadness, and life to everything. It is the essence of order, and leads to all that is good, just and beautiful, of which it is the invisible, but nevertheless dazzling, passionate, and eternal form". Plato, 400 B.C. (from the Dialogues) On Thu, Jan 23, 2014 at 9:19 AM, Victor Benichoux <victor.benichoux@xxxxxxxx>wrote: > Hi all, > > You may also be interested in reading this blog post by Romain Brette: > > http://briansimulator.org/what-is-sound-xv-footsteps-and-head-scratching/ > > Best, > Victor > > On 22 Jan 2014, at 16:20, Mark Riggle <markriggle@xxxxxxxx> wrote: > > How interesting you would be interested in the footstep. The human walk > is unique in producing that particular sound heard internally via the > skeleton. Our footstep has the foot hitting the floor with only a vertical > velocity (the horizontal is at or nearly zero). The foot-bones stop so > rapidly that the force on them causes a compression wave to start there. > That wave travels up the skeleton to the skull -- that causes a high G > (>1g) jerk on the head. That is what is heard and vestibularly felt -- > that shockwave is passing through the skull. This is only in the human > walk. In human adults it is referred to as the heel strike transient. > However, the earlier developmental walks (infant and young child), > although mechanically different, will also produce that audible shockwave. > So search for heel strike transient. The audible effect however seems > ignored - only the high skeletal jerk is investigated. > > What is interesting to me is this is the same pattern that occurs with > very loud rock-music. The walk produces about 120 bpm of a vestibular jolt > (that could produce a VEMP response) that is also audible, and when > rock-music is louder than about 95 dB, it does the same. > That is not a coincidence that these are only in humans. There are some > other human unique behaviors supporting that claim. > > If you do a study on the acoustic part of that shockwave, please let me > know. > > > On Tue, Jan 21, 2014 at 11:45 AM, Linda Seltzer < > lseltzer@xxxxxxxx> wrote: > >> When we walk, we can hear our footsteps, even if we are walking barefoot >> on a soft surface. However, the number of steps per second in walking is >> below the auditory range. What is it about the impact with the ground >> that causes the auditory signal? Are there papers on the acoustics of a >> footstep? >> >> Thank you for any information. >> >> Linda Seltzer >> > > > -- --------------------------------------------------------------- www.lucaturchet.it "Music is a moral law: It gives a soul to the Universe, wings to the mind, flight to the imagination, a charm to sadness, and life to everything. It is the essence of order, and leads to all that is good, just and beautiful, of which it is the invisible, but nevertheless dazzling, passionate, and eternal form". Plato, 400 B.C. (from the Dialogues) --bcaec51b2029a6442f04f0a18857 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Hi Linda,<br>Bruno definitively suggested you the relevant= literature. <br>You might be interested also in my project "Audio-hap= tic walking simulations <br>for virtual reality, entertainment and rehabili= tation applications", which is <br> basically a follow up of the NIW project mentioned before. <br>I am using s= ynthesis techniques based on physical and physically-inspired models to <br= >simulate footstep sounds produced by different grounds, shoe types, walker= s with different <br> anthropomorphic features, and different types of foot-floor interactions.<b= r><br>Have a look to <a href=3D"http://www.ahws-project.net/">http://www.ah= ws-project.net/</a><br><br><br>Thanks a lot Victor for sharing that interes= ting link.<br> <br>Does any of you know if there is any study on the bone conduction occur= ring during walking?<br><br>The topic is very interesting to me. For exampl= e perceptual effects might arise when <br>providing through headphones the = interactive simulation of a foostep on a ground different <br> from that the walker is trampling on. Indeed, maybe beside to a semantic or= temporal <br>conflict between the auditory and the haptic sensory informat= ion during the integration of <br>the two stimuli, there might be also a co= nflict between the auditory information arriving <br> through the air and the bones.<br><br>Any useful information about this top= ic would be very appreciated.<br><br><br>If someone of you is interested in= starting a collaboration to investigate such a topic <br>using the technol= ogy I am developing please contact me. <br> <br><br>Best<br><br>Luca<br><br><br>-- <br>--------------------------------= -------------------------------<br><br><a href=3D"http://www.lucaturchet.it= " target=3D"_blank">www.lucaturchet.it</a><br><br><br>"Music is a mora= l law:<br> It gives a soul to the Universe,<br>wings to the mind,<br>flight to the ima= gination,<br>a charm to sadness,<br>and life to everything.<br>It is the es= sence of order,<br>and leads to all that is good,<br>just and beautiful,<br= > of which it is the invisible,<br>but nevertheless dazzling,<br>passionate, = and eternal form".=A0=A0 <br><br>Plato, 400 B.C. (from the Dialogues)<= br><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Thu, Ja= n 23, 2014 at 9:19 AM, Victor Benichoux <span dir=3D"ltr"><<a href=3D"ma= ilto:victor.benichoux@xxxxxxxx" target=3D"_blank">victor.benichoux@xxxxxxxx</a>= ></span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-= left:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D"word-wrap:b= reak-word">Hi all,<div><br><div><span style=3D"white-space:pre-wrap"> </spa= n>You may also be interested in reading this blog post by Romain Brette:</d= iv> <div><br></div><div><span style=3D"white-space:pre-wrap"> </span><a href=3D= "http://briansimulator.org/what-is-sound-xv-footsteps-and-head-scratching/"= target=3D"_blank">http://briansimulator.org/what-is-sound-xv-footsteps-and= -head-scratching/</a></div> <div><br></div><div>Best,</div><div>Victor</div></div><div><div class=3D"h5= "><div><br></div><div><div>On 22 Jan 2014, at 16:20, Mark Riggle <<a hre= f=3D"mailto:markriggle@xxxxxxxx" target=3D"_blank">markriggle@xxxxxxxx= .RICE.EDU</a>> wrote:</div> <br><blockquote type=3D"cite"><div dir=3D"ltr"><div><div>How interesting yo= u would be interested in the footstep.=A0 The=20 human walk is unique in producing that particular sound heard internally via the skeleton.=A0 Our footstep has the foot hitting the floor with=20 only a vertical velocity (the horizontal is at or nearly zero).=A0 The=20 foot-bones stop so rapidly that the force on them causes a compression=20 wave to start there.=A0 That wave travels up the skeleton to the skull --= =20 that causes a high G (>1g) jerk on the head. =A0 That is what is heard= =20 and vestibularly=A0 felt -- that shockwave is passing through the skull.=A0= =A0 This=A0 is only in the human walk.=A0 In human adults it is referred to as= =20 the heel strike transient.</div> However, the earlier developmental walks (infant and young child),=20 although mechanically different,=A0 will also produce that audible=20 shockwave.<br></div>So search for heel strike transient.=A0=A0 The audible = effect however seems ignored - only the high skeletal jerk is investigated.= <br> <div><br></div><div>What is interesting to me is this is the same=20 pattern that occurs with very loud rock-music.=A0 The walk produces about= =20 120 bpm of a vestibular jolt (that could produce a VEMP response) that=20 is also audible, and when rock-music is louder than about 95 dB, it does the same. <br> </div><div>That is not a coincidence that these are only in humans.=A0 Ther= e are some other human unique behaviors supporting that claim.<br><br></div= >If you do a study on the acoustic part of that shockwave, please let me kn= ow.<div> <div><img src=3D"https://mail.google.com/mail/images/cleardot.gif"></div></= div></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On = Tue, Jan 21, 2014 at 11:45 AM, Linda Seltzer <span dir=3D"ltr"><<a href= =3D"mailto:lseltzer@xxxxxxxx" target=3D"_blank">lseltzer@xxxxxxxx= altech.edu</a>></span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-= left:1px solid rgb(204,204,204);padding-left:1ex">When we walk, we can hear= our footsteps, even if we are walking barefoot<br> on a soft surface. =A0However, the number of steps per second in walking is= <br> below the auditory range. =A0What is it about the impact with the ground<br= > that causes the auditory signal? =A0Are there papers on the acoustics of a<= br> footstep?<br> <br> Thank you for any information.<br> <span><font color=3D"#888888"><br> Linda Seltzer<br> </font></span></blockquote></div><br></div> </blockquote></div><br></div></div></div></blockquote></div><br><br clear= =3D"all"><br>-- <br><div dir=3D"ltr">--------------------------------------= -------------------------<br><br><a href=3D"http://www.lucaturchet.it" targ= et=3D"_blank">www.lucaturchet.it</a><br> <br><br>"Music is a moral law:<br>It gives a soul to the Universe,<br>= wings to the mind,<br>flight to the imagination,<br>a charm to sadness,<br>= and life to everything.<br>It is the essence of order,<br>and leads to all = that is good,<br> just and beautiful,<br>of which it is the invisible,<br>but nevertheless da= zzling,<br>passionate, and eternal form".=A0=A0 <br><br>Plato, 400 B.C= . (from the Dialogues)<br></div> </div></div> --bcaec51b2029a6442f04f0a18857--