Stereosnemanje: principi dvoušesne zaznave zvoka

slovenian

2013

volume 60, issue 3

acoustics    sound recording    surround    impulse response    transfer function    scattering 

Društvo matematikov, fizikov in astronomov

Challenges of stereo pair miking of acoustic venues are reviewed. The goal is to capture the listener's live acoustic experience as veristic as possible and then reproduce it as to arouse in him the feelings he had during the live performance. Coincident setup are disfavoured and omnidirectional spaced pair techniques are preferred to directional ones. This can be baffled to improve the intensity separation of the two channels. A natural extrapolation of the baffling is the use of a dummy (or even human) head - the binaural recording technique. The effect of the head is qualitatively discussed, the head-related impulse response (HRIR) and transfer function (HRTF) are introduced. The effect of the incidence on a high impedance boundary is discussed and related to the influence of the dummy head surface on low and high frequencies. The exact solution of the scattering of a plane wave on a hard sphere is presented and from it the hard sphere transfer function is extracted, which serves as a model for the HRTF of human head. With the help of this model, qualitative features of the HRTF are brought in connection with underlying physical principles.

14.01.2016