On Rayleigh distance and absorption length of parametric loudspeakers

Farias, Felipe S.; Abdulla, Waleed H.

doi:10.1109/apsipa.2015.7415476

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Fortunately, for applications of speech soundfields, high SPLs from the PL are not necessary for high frequency ( 2 kHz) components of speech [19], further, harmonic distortions are lower above this frequency [16]. Taking into account the PL location so that the far-field demodulated audio [27] overlays D b and under the assumption that high SPL from the PL is not required over D b , health risks from the PLs could be argued to be negligible.…”

Section: B Pls For Speech Soundfieldsmentioning

confidence: 99%

Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers

Donley

Ritz

Kleijn

2016

2016 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA)

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This paper proposes a hybrid approach to personal sound zones utilising multizone soundfield reproduction techniques and parametric loudspeakers. Crossover filters are designed, to switch between reproduction methods, through analytical analysis of aliasing artifacts in multizone reproductions. By realising the designed crossover filters, wideband acoustic contrast between zones is significantly improved. The trade-off between acoustic contrast and the bandwidth of the reproduced soundfield is investigated. Results show that by incorporating the proposed hybrid model the whole wideband bandwidth is spatial-aliasing free with a mean acoustic contrast consistently above 54.2dB, an improvement of up to 24.2dB from a non-hybrid approach, with as few as 16 dynamic loudspeakers and one parametric loudspeaker. Abstract-This paper proposes a hybrid approach to personal sound zones utilising multizone soundfield reproduction techniques and parametric loudspeakers. Crossover filters are designed, to switch between reproduction methods, through analytical analysis of aliasing artifacts in multizone reproductions. By realising the designed crossover filters, wideband acoustic contrast between zones is significantly improved. The trade-off between acoustic contrast and the bandwidth of the reproduced soundfield is investigated. Results show that by incorporating the proposed hybrid model the whole wideband bandwidth is spatial-aliasing free with a mean acoustic contrast consistently above 54.2dB, an improvement of up to 24.2dB from a nonhybrid approach, with as few as 16 dynamic loudspeakers and one parametric loudspeaker.

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Section: B Pls For Speech Soundfieldsmentioning

confidence: 99%