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A comparison of different surround sound recording and reproduction techniques based on the use of a 32 capsules microphone array, including the influence of panoramic video

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This paper provides a comparison between the operational results of Ambisonics (1st, 2nd and 3rd order), and the first examples of SPS and 3DVMS techniques. Audio and video were recorded at the same time, employing the Eigenmike microphone and a panoramic video capture system of our design. The results were submitted to a pool of test subjects, that evaluated several common psycho-acoustical parameters. Furthermore the same tests were repeated with and without the accompanying panoramic video. These tests were performed in the 3Sixty room in the University of York, an immersive space with all-around video projection and a 32 speakers array. A complete set of IRs has been measured placing a Soundfield microphone in the center of the room and sending a sine sweep test signal to each of the 32 loudspeakers. These IRs have been employed for equalizing individually each loudspeaker for Ambisonics and 3DVMS playback, and for computing the matrix of decoding FIR filters for the SPS method. In addition to this we experimented with the capture of a live performance in the room and with the virtual reconstruction of the audio-visual experience.

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