Opportunities and challenges for Bluetooth LE Audio assistive listening systems

Summary

Reviews how Bluetooth LE Audio with Auracast compares with loop, radio and infrared assistive listening, and discusses signal processing for level calibration and position-dependent delay.

Key findings

• Notes that the recommended calibration of sound levels in Auracast transmitters and receivers mirrors the standard for calibrating hearing loops, but that loops are normally installed by trained professionals, while simple Auracast transmitters are likely to be set up by non-experts in many cases.
• Points out that in a large venue a loop installer can insert one delay to match the sound arriving at the looped area, whereas Auracast listeners are not confined to one position and so experience a range of acoustic delays.
• Discusses signal-processing approaches to level calibration and to variable audio delay in Auracast transmitters and receivers.

Limits

Only the abstract was read; the full paper is behind a paywall. A review and discussion paper without new listening data.

Read the original

doi.org/10.1109/ICASSP49660.2025.10889430

Link checked 9 October 2026. We link to the original and do not host copies.

Cited in

• Should the Auracast stream be delayed to line up with the loudspeakers?Open
• What audio level should the stream carry: -35 dBFS or louder?Disputed
• Should a venue keep its hearing loop when it adds Auracast, and can one system serve both?Partly answered

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