umashankar manthravadi wrote:
I was trying to say something else. The head moves independently of
shoulder position. Pinnae are rigidly linked to the head; the
shoulders are not. That is what made me think the two should be
treated separately.
umashankar
Sorry for coming back "late":
The head < can > move independently of shoulder position, if the
reference is the "HRTF sphere" - or simply say "outside world". :-)
(There are two ways to change the position of yours ears: Your whole
body moves, you move just your head vs. a fixed torso - and obviously
you can have all combinations.)
The visual case (eye movement) is very similar. There are two basic ways
to move your eyes, i.e. to change your view:
http://www.roadtovr.com/hands-smis-gear-vr-eye-tracking-accurate-fast-lightweight/
In both cases (eye, ear movements) you have two degrees of freedom.
Best,
St.
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
Windows 10
From: Stefan Schreiber <mailto:[email protected]>
Sent: Friday, February 26, 2016 8:07 AM
To: Surround Sound discussion group <mailto:[email protected]>
Subject: Re: [Sursound] OSSIC Kickstarter Campaign Begins
Stefan Schreiber wrote:
> Augustine Leudar wrote:
>
>> do you have a reference/source for that - that shoulder head
reflections
>> dont matter in anechoice etc etc - I would be interested to read it...
>>
>>
> They just arrive later than direct sound. And if the HRTF length is
> too short and so you don't have the sample length to capture (any)
> reflections...
>
> Clear? Or did < I > miss something?
>
> St.
Ok, I stand corrected:
http://alumni.media.mit.edu/~kdm/hrtfdoc/section3_4.html#SECTION0004000000000000000
<http://alumni.media.mit.edu/%7Ekdm/hrtfdoc/section3_4.html#SECTION0004000000000000000>
> In order to reduce the size of the data set without eliminating
> anything of potential interest, we decided to discard the first 200
> samples of each impulse response and save the next 512 samples. Each
> HRTF response is thus 512 samples long. < Most researchers will no
> doubt truncate this data further. >
> 44.1 kHz sampling rate
As the speed of sound is about 340m/s, you will capture shoulder
reflections even with just 128 samples.
(If your ear-shoulder distance is about 20cm, the shoulder reflections
will arrive about 40cm delayed compared to direct sound, i.e. about 1,2
ms later.
128/44.100 = 2,9 ms.)
Best,
Stefan
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