Determination of room acoustic parameters using spherical beamforming – The example of Lisbon’s Garrett Hall

This paper focus on the determination of room acoustic objective parameters using rigid sphere spherical beamforming. This determination was done through post-processing of the audio signals recorded with a 64-channel spherical acoustic camera. The work was carried out during the acoustical assessment of the Garrett Hall in the D. Maria II National Theatre in Lisbon. For comparison purposes, the assessment was complemented using standard experimental measuring techniques, according to the ISO 3382 standard, employing an omnidirectional and a figure-of-eight microphone. The obtained results show that the average -Hall's acoustic metrics obtained through spherical beamforming agree very well with the corresponding metrics as determined through the ISO 3382 procedure, except for the early lateral fraction JLF, where some differences in most octave bands is seen.