Roelof Vermeulen at Philips : a search for space in music by Kees Tazelaar

“…Experiments with artificial head microphones for binaural recordings and with stereophonic recording were therefore soon expanded with so-called ambiophony; a technique developed by Vermeulen whereby loudspeakers reproducing stereo sound were supplemented with indirectly oriented speakers for "diffuse" sound. …”
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