The music was played and mixed live on the stage during performances. In this way, the audience participates in the most intimate way. Nanna chose to use binaural microphones for several of the actors and transmit the signals to the audience by using stereo receivers and headphones.
The entire theater space works as the stage and minor “incidents” take place here and there. In the play, the audience moves around among the actors. Nanna-Karina Schleimann created sound design and musical compositions. This play was developed by students of the Danish National School of Performing Arts. Soundbites from the play: Good for Nothing Using the a binaural headset is very close to the HRTF measured with a blocked ear canal (to the right). The curves to the right show the HRTFs from subjects with blocked ear canal.įigure 1 HRTF of human subjects, open and closed ear canal. The curves on the left are measured with an open ear canal. Each curve represents an average across many subjects. In the next figure, you can see two sets of curves (HRTFs). The researchers at Aalborg University, Denmark, carried out comprehensive studies in the 90s. Much research has been done regarding binaural sound during the last 30 years. This is why the binaural recording technique is worth considering for many purposes. However, in general, everybody experiences a much higher envelopment of the surrounding sound, even though the HRTF is not their own. Thus binaural recordings sound the best if recorded using your personal HRTF. HRTF is closely related to the individual shape of the human head. On the opposite side of the head, some shadowing effect occurs in the same frequency range.
The side of the head closest to the sound source provides a reflection which causes a pressure build-up in the mid-frequency range. The level, the frequency response and the time of arrival differ. However, as soon as the sound moves to one of the sides, the sound becomes different as it reaches each ear. When the sound comes from in front of a person, the influence is symmetrical, meaning that the sound is the same at both ears. The size and the shape of the head, the size and the shape of the ears and the distance between the ears all contribute to a filtering of the acoustical signal before it reaches the eardrums. This transfer function expresses how the head, the ears (and also the torso) affects the transmission of an acoustical signal from a sound source to the eardrums. We express the physical influence from the head by the so-called Head-Related Transfer Function or HRTF for short.
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