umashankar manthravadi wrote:
two years ago, I acquired a motor cycle helmet with the intention of mounting
eight headphones to listen to ambisonics without hrtf. i was going to use it
with a 20 dollar dolby 7.1 usb device.I did not go head because I realized I
would still need headtracking.
by the cell phone does not have to be on top of the head. it can be in a small
bag handing at the back of the head, or even one side. it merely needs to move
with the head.
umashankar
But IF we already talk about this: You could design a small device with
the battery, position/HT ICs and the (bluetooth) transmittor.
Or: Build this into the headphone, the integrated solution Beyer and
Sennheiser are seemingly not able to deliver - as there is supposedly
no market, I guess.
Whole the Oculus Rift is supposed to cost less than a high end smartphone...
http://en.wikipedia.org/wiki/Oculus_Rift
"Initial prototypes used a Hillcrest Labs 3DoF head tracker that is
normally 125 Hz, with a special firmware that John Carmack requested
which makes it run at 250 Hz, tracker latency being vital due to the
dependency of virtual reality's realism on response time. The latest
version includes Oculus' new 1000 Hz Adjacent Reality Tracker that will
allow for much lower latency tracking than almost any other tracker. It
uses a combination of 3-axis gyros, accelerometers, and magnetometers,
which make it capable of absolute (relative to earth) head orientation
tracking without drift.[15][22]"
Just to answer some questions from before...
(I have posted about this way before.)
Best,
Stefan
Date: Thu, 12 Dec 2013 07:40:03 -0500
From: m...@hacklava.net
To: sursound@music.vt.edu
Subject: Re: [Sursound] Upcoming Android apps ambisonic related
Hi Étienne.
etienne deleflie <edelef...@gmail.com> a écrit :
... and then ambisonics is suddenly available to
masses of people, for very cheap, and with a consistent and quality
spatial experience (assuming the HRTF decoding can be done right).
Etienne
HRTF decoding is the problem here. Finding a proper HRTF profile by
trying many (over of hundred) is not a solution; realistic binaural
reproduction works only when I listen to my own binaural recordings.
So, to enjoy "mass produced" ambisonics, I'd need personalized HRTF
measurements, a service that is not cheap and non-existent for a
majority of "HRTF challenged" people; for us, decoding ambisonics over
4 speakers is a better option, and streaming ambisonics from a phone
with blutooth to a classic decoder would work. With ambisonics, there's
many solutions.
--
Marc
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