Subject: Re: [AUDITORY] On 3D audio rendering for signals with the low sampling frequency From: "Richard F. Lyon" <dicklyon@xxxxxxxx> Date: Wed, 10 Aug 2022 21:28:49 -0700--000000000000c587cb05e5ef9ae6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable You could do "bandwidth extension" on the signals you want to spatialize, e.g. with some of the methods at https://gfx.cs.princeton.edu/pubs/Su_2021_BEI/ICASSP2021_Su_Wang_BWE.pdf and then apply the high-sample-rate HRTFs. Of course, if your system has a 16 ksps limitation on the output side, that will be of no use. Dick On Wed, Aug 10, 2022 at 9:22 PM Junfeng Li <junfeng.li.1979@xxxxxxxx> wrote: > Dear all, > > We are working on 3D audio rendering for signals with low sampling > frequency. > As you may know, the HRTFs are normally measured at the high sampling > frequency, e.g., 48kHz or 44.1kHz. However, the sampling frequency of sou= nd > signals in our application is restricted to 16 kHz. Therefore, to render > this low-frequency (=E2=89=A48kHz) signal, one straight way is to first d= ownsample > the HRTFs from 48kHz/44.1kHz to 16kHz and then convolve with sound signal= s. > However, the sound localization performance of the signal rendered with > this approach is greatly decreased, especially elevation perception. To > improve the sound localization performance, I am now wondering whether > there is a certain good method to solve or mitigate this problem in this > scenario. > > Any discussion is welcome. > > Thanks a lot again. > > Best regards, > Junfeng > --000000000000c587cb05e5ef9ae6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">You= could do "bandwidth extension" on the signals you want to spatia= lize, e.g. with some of the methods at <br></div><div class=3D"gmail_defaul= t" style=3D"font-size:small"><a href=3D"https://gfx.cs.princeton.edu/pubs/S= u_2021_BEI/ICASSP2021_Su_Wang_BWE.pdf">https://gfx.cs.princeton.edu/pubs/Su= _2021_BEI/ICASSP2021_Su_Wang_BWE.pdf</a></div><div class=3D"gmail_default" = style=3D"font-size:small">and then apply the high-sample-rate HRTFs.=C2=A0 = <br></div><div class=3D"gmail_default" style=3D"font-size:small">Of course,= if your system has a 16 ksps limitation on the output side, that will be o= f no use.<br></div><div class=3D"gmail_default" style=3D"font-size:small"><= br></div><div class=3D"gmail_default" style=3D"font-size:small">Dick</div><= div class=3D"gmail_default" style=3D"font-size:small"><br></div></div><br><= div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Aug= 10, 2022 at 9:22 PM Junfeng Li <<a href=3D"mailto:junfeng.li.1979@xxxxxxxx= .com">junfeng.li.1979@xxxxxxxx</a>> wrote:<br></div><blockquote class= =3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg= b(204,204,204);padding-left:1ex"><div dir=3D"ltr">Dear all,=C2=A0<div><br><= /div><div>We are working on 3D audio rendering for signals with low samplin= g frequency.=C2=A0</div><div>As you may know, the HRTFs=C2=A0 are normally = measured at the high sampling frequency, e.g., 48kHz or 44.1kHz. However, t= he sampling frequency of sound signals in our application=C2=A0is restricte= d to 16 kHz. Therefore, to render this low-frequency (=E2=89=A48kHz) signal= , one straight way is to first=C2=A0downsample the HRTFs from 48kHz/44.1kHz= to 16kHz and then=C2=A0convolve with sound signals. However, the sound loc= alization performance of the signal rendered=C2=A0with this approach is gre= atly decreased, especially elevation perception. To improve the=C2=A0sound = localization performance, I am now wondering whether there is a certain goo= d method to solve or mitigate this problem in this scenario.=C2=A0</div><di= v><br></div><div>Any discussion is welcome.</div><div><br></div><div>Thanks= a lot again.</div><div><br></div><div>Best regards,</div><div>Junfeng=C2= =A0</div></div> </blockquote></div> --000000000000c587cb05e5ef9ae6--