The other thing you have to consider is the listener. In discussions
in this group some years ago we used to refer (half) jokingly to
needing to fix the listener's head in place - using something that I
seem to recall came to be known as the "Green-Lee Neck Brace" or
something like that. The serious point about this joke was the fact
that you can't restrict the movement of your listeners, so you need to
have systems that are relatively robust in this respect, hence the
in-phase type decodes that many of us use for large area work and the
fact that we tend to use larger numbers of speakers than would be
ideal in terms of field reconstruction theory. The 0.5mS probably
refers to the maximum interaural delay for the mk I human head as
errors bigger than that can increase image confusion for a central
listener.
Dave
On 29 January 2013 07:45, Ross Bencina <[email protected]> wrote:
> On 29/01/2013 6:32 PM, Sven Thebert wrote:
>>
>> the delay should be within 0.5ms.
>
>
> Fons no doubt has more to add, but one way to think about delay is this:
>
> speed of sound at sea level = 340.29 m / s
>
> therefore a 1ms delay is equivalent to moving the source ~34 cm. 0.5ms would
> be equivalent to 17 cm.
>
> Different panning/decode methods will have different tolerances to
> misaligned speakers.
>
> Ross.
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--
As of 1st October 2012, I have retired from the University, so this
disclaimer is redundant....
These are my own views and may or may not be shared by my employer
Dave Malham
Ex-Music Research Centre
Department of Music
The University of York
Heslington
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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