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 > > > > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
