re. the second question - sorry, i realise what would be needed would be
a series of IRs for various angles produced in advance, perhaps by an
equal power summing. Using all these IRs would be a more complex
proposition.
iain



Em Fri, 2013-11-01 às 11:14 -0200, Iain Mott escreveu:
> 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
> 
> 
> 
> 


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