Ralph, I'm thinking of an installation context, where there are many
listening positions. If a person is standing close to a speaker that is
some distance from the position of a virtual sound source, you would
want an appropriate delay in the playback of the sound source from the
close by speaker. In DBAP it will be at a lower amplitude than the
speakers close to the virtual source, but the precedence effect could
well make it appear that the source is at the close by speaker.
For our immerGo immersive sound system I made use of attenuation and
delays at the cross points of a matrix in each of a number of speakers.
I found that the incorporation of delays, together with attenuation
values generated from DBAP, contributed substantially to the
localization effect.
On 2019/08/20 9:15 PM, Ralph Jones wrote:
I believe this is backwards. For a given listening position, the *closer*
speaker should be delayed if you want its output to arrive at the same time as
that from a farther speaker.
Richard Foss wrote:
Just catching up on your comment about time alignment with DBAP, Gus.
I do think its useful to use delays - so for a particular real source
channel, delay its play out from a speaker far from the virtual source
longer than from a speaker close to the virtual source. With DBAP the
source channel will play from all speakers, albeit with different
amplitudes. For a person in an installation standing close to a further
speaker, the precedence effect could well come into play without
appropriate delays, as I see it.
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Professor Richard Foss
Computer Science Department
Rhodes University
Grahamstown 6140
South Africa
Tel: +27 46 6038294
Cell: +27 83 288 9354
email: r.f...@ru.ac.za
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