Reproducing Personal Sound Zones Using a Hybrid Synthesis of Dynamic and Parametric Loudspeakers
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This presentation overviews a proposed 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.
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Reproducing Personal Sound Zones Using a Hybrid Synthesis of Dynamic and Parametric Loudspeakers
- 1. Reproducing Personal Sound Zones Using a Hybrid Synthesis of Dynamic and Parametric Loudspeakers * * † * †
- 2. Introduction — Personalized audio environments in spatialized zones — Vehicle cabin entertainment/communication systems — Cinema surround sound systems — Multi-participant teleconferencing — Individual audio in restaurant/cafés — Minimum sound leakage between zones — High acoustic contrast — Excellent speech quality — Good speech privacy
- 3. Introduction — Personalized audio environments in spatialized zones — Vehicle cabin entertainment/communication systems — Cinema surround sound systems — Multi-participant teleconferencing — Individual audio in restaurant/cafés — Minimum sound leakage between zones — High acoustic contrast — Excellent speech quality — Good speech privacy Room
- 4. Multizone Soundfield Reproduction (MSR) (DynamicLoudspeakers) — Accurate multizone soundfield reproduction up to spatial aliasing frequency — Any arbitrary virtual source soundfield — Large acoustic contrast between zones — Spatial aliasing frequency can be solved analytically — Little to no multizone soundfield control above aliasing frequency (proportional to number of loudspeakers) — Reduced acoustic contrast above aliasing frequency
- 5. Multizone Soundfield Reproduction (MSR) (DynamicLoudspeakers) Orthogonal basis expansion Loudspeaker weights:
- 6. Multizone Soundfield Reproduction (MSR) (DynamicLoudspeakers) Orthogonal basis expansion Loudspeaker weights:
- 7. Multizone Soundfield Reproduction (MSR) (DynamicLoudspeakers) Orthogonal basis expansion Loudspeaker weights:
- 8. Parametric Loudspeaker (PL) — Narrow directivity and large acoustic contrast at high frequencies — No spatial aliasing for wideband speech (dependent on transducer spacing) — Steerable beams with parametric loudspeaker arrays — Poor low frequency directivity and acoustic contrast — Sound pressure of the demodulated signal limited to ~60dB — greater harmonic distortion than dynamic loudspeakers
- 9. Parametric Loudspeaker (PL) Convolutional directivity
- 10. Parametric Loudspeaker (PL) Convolutional directivity
- 11. Parametric Loudspeaker (PL) Convolutional directivity
- 12. Parametric Loudspeaker (PL) Convolutional directivity
- 13. Parametric Loudspeaker (PL) Convolutional directivity
- 14. Hybrid Synthesis of Speech Soundfields Multizone soundfield reproduction — Large acoustic contrast — Capable of high SPL — Low harmonic distortion Parametric Loudspeaker — Large acoustic contrast — Demodulated SPL suits speech levels — Low harmonic distortion — Wideband ~150Hz to 8kHz — SPL ~60dB (decreasing at higher frequencies) — Harmonic distortion reduces speech quality
- 15. Hybrid Synthesis of Speech Soundfields — Analytically Derivable — Zone dependent — Distinguishes MSR high/low acoustic contrast boundary — Minimum spectral distortion at crossover frequency — Spatially dependent crossover frequency (modal truncation length)
- 16. Hybrid Synthesis of Speech Soundfields — Analytically Derivable — Zone dependent — Distinguishes MSR high/low acoustic contrast boundary — Minimum spectral distortion at crossover frequency — Spatially dependent crossover frequency (modal truncation length) smallest radius encompassing all zones
- 17. Hybrid Synthesis of Speech Soundfields — Magnitude response of crossover filters sums to unity (no spectral distortion) — Easily computed Butterworth polynomials — Arbitrary crossover frequency
- 18. Hybrid Synthesis of Speech Soundfields — Magnitude response of crossover filters sums to unity (no spectral distortion) — Easily computed Butterworth polynomials — Arbitrary crossover frequency
- 19. Hybrid Synthesis of Speech Soundfields — Magnitude response of crossover filters sums to unity (no spectral distortion) — Easily computed Butterworth polynomials — Arbitrary crossover frequency
- 20. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 21. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 22. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 23. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 24. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 25. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 26. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 27. Hybrid Synthesis of Speech Soundfields �ℋ � �, � ℛ �ℛ�� �
- 30. Results �ℛ � �ℛ � � �
- 36. Results �ℛ � �ℛ � � MSR PL ℋ � MSR PL ℋ MSR
- 37. Results �ℛ � �ℛ � � MSR PL ℋ � MSR PL ℋ MSR
- 38. Results �ℛ � �ℛ � � MSR PL ℋ � MSR PL ℋ MSR
- 39. Questions