Subjective comparison between Stereo Dipole and 3D Ambisonics surround systems for automotive applications
1) Angelo Farina, 2) Emanuele Ugolotti
Universita' di Parma
2) ASK Automotive Industries
The paper describes the results of a subjective evaluation experiment: two
methods for recording a three-dimensional sound field and for reproducing it
through loudspeakers in a proper listening room are compared.
The first method is the binaural method known as Stereo Dipole, based on
digital filtering of binaural recordings or binaurally synthesized sound
tracks: it allows for reproduction over a pair of closely-located
loudspeakers. The second method is a software implementation of the
well-known Ambisonics methodology, in which a B-format recording made with a
Soundfield mic, or a synthesized B-format soundtrack, is reproduced over a
3D array of 8 loudspeakers.
The subjective comparisons were made in a listening room fitted with 10
loudspeakers, and the listeners did not know at what of the two systems they
were listening. Both reproduction systems were employed for blind evaluation
of the sound field generated by audio systems of different cars.
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