hello list,

I've been reading a paper recently "B-Format Acoustic Impulse Response
Measurement and Analysis in the Forest at Koli National Park, Finland"
by Simon Shelley, Damian Murphy and Andrew Chadwick, where a
unidirectional loudspeaker is used to collect IRs via a
sine-sweep/de-convolution method. To simulate an omnidirectional source,
four recordings are made of the sweep with the loudspeaker directed at
the mic and at 3 other positions 45 degrees apart.

The IRs for the simulated omnidirectional source are created by: 

"summing the resulting impulse responses measured for each angle of the
loudspeaker. The effect of the summation is to emulate a loudspeaker
array of four loudspeakers at the same point in space all pointing in
different directions."

So, my first question is, is this "summing" really a simple summation of
the 4 sets (a b-format mic is used) of IRs with some attenuation of
each, or would there be something more complex involved?

I'm interested in spatialising the human voice with IRs - and a
directional source is probably more appropriate than an omnidirectional
one. The above got me thinking though, if it is a simple sum, wouldn't
it be possible to simulate the variable orientation of a speaker (human)
by doing an equal power crossfade between adjacent angular IRs as this
virtual human speaker turns?

Am I oversimplifying?

Thanks,

Iain




-- 
________
Iain Mott
http://reverberant.com
http://audiocena.com.br 

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