From induction loop to Auracast: How accessible hearing is making the leap into the future
Whether in the theatre, at the train station, or on a tour: background noise and room echo make speech difficult to understand – even with hearing aids. There have been many assistive listening solutions, but they were often either cumbersome or not universal. With Auracast, a standard is now emerging that can bring together accessibility and comfort – in practice mostly as a hybrid of open-ended devices and dedicated receivers.
Why accessible audio is fundamentally an infrastructure issue
Anyone sitting in a crowded hall, needing to understand an announcement at the train station, or following a tour in a museum knows the problem: even with hearing aids, speech quickly becomes a puzzle in echoey or loud environments. For this, there have been assistive listening solutions for decades – but they were often either technically good but cumbersome, or simple but not universal.
In recent years, a change has been emerging: with Bluetooth LE Audio and Auracast Broadcast Audio, a cross-manufacturer broadcast technology is being developed that addresses both accessibility and user comfort.
Classic solutions: What existed in the past – and where it fell short
Induction loops (hearing loop) and telecoil (T-coil)
Here’s how it works: A conductor laid in the room generates a magnetic field that is picked up by the T-coil in the hearing aid or cochlear implant.
Advantages:
- Low-threshold for users: Switch to T/MT – done.
- Discreet and dignified: no loan device, no hygiene discussion.
- Proven and widely available.
Disadvantages:
- Installation and calibration are demanding; building steel and interference sources affect quality.
- Not every device has an activated T-coil, and not everyone knows how to use it.
- Coverage is tied to the loop area; outside, quality drops significantly.
In short: Very good if planned and used properly – but not consistently in practice everywhere.
Radio systems (FM/RF) with loan receivers
Here's how it works: A transmitter broadcasts audio to special receivers (bodypacks) that you borrow, plus headphones or neckloop.
Advantages:
- Flexibly usable (also temporarily, also outdoors).
- Good ranges possible.
Disadvantages:
- High friction in operation: issuing, returning, charging, hygiene, instruction.
- Channel/interference management can become complex.
- Visible additional device is a hurdle for many.
Infrared (IR) – good "in the room", but dependent on line of sight
Here's how it works: IR emitters send audio to IR receivers in the room.
Advantages:
- High privacy: Signal typically remains in the room.
- No radio interference.
Disadvantages:
- Line of sight needed: People, columns, or poor placement cause dropouts.
- Sunlight can be distracting; difficult outside.
- As with radio: loan receivers, batteries, hygiene, loss.
Wi-Fi/App-based systems
Here’s how it works: Audio is streamed to the smartphone via local network or internet; it is heard through headphones or (depending on setup) hearing aid accessories.
Advantages:
- Bring-your-own-device can reduce loan devices.
- Multilingual streams and additional content are possible.
Disadvantages:
- Complexity: app, login, network quality, IT support, latency.
- Often proprietary; hearing aid connection does not always work without additional devices.
- People without a current smartphone may be excluded.
Proprietary personal systems (e.g. microphone/receiver ecosystems)
Such systems are often excellent for individual and teaching situations.
Advantages:
- Very good speech intelligibility in difficult 1:1 environments.
Disadvantages:
- Not universal: dependent on manufacturer, models, accessories.
- More person-centred than thought of as 'venue infrastructure'.
The pattern behind it: good technology, but rarely without hurdles.
Auracast: broadcast audio becomes a standard building block
Auracast broadcast audio is part of Bluetooth LE Audio. Instead of classic Bluetooth pairing (1:1), a transmitter can send to many receivers simultaneously. Users select the desired stream – similar to selecting a Wi-Fi network, but for audio.
This is particularly relevant for accessibility:
- Standardised and cross-manufacturer: compatible hearing aids, earbuds or smartphones can listen directly.
- Multiple streams in parallel: e.g. "Main audio", "Dialogue enhancement", "German/English", "Audio description".
- Venue-compatible: transmitters can be connected to existing AV/PA systems – from events to announcements.
Myth vs. reality: "Auracast = no more loan devices?"
Myth: With Auracast, no one needs loan receivers anymore – everyone simply uses their own device.
Reality: Auracast makes it significantly easier for many people to listen with their own hearing aids, earbuds, or smartphones – but in practice, there will also be long-term situations where dedicated receivers remain important:
- Not everyone has a compatible device with them (or wants to use their own smartphone).
- Organisers want to ensure that truly no one is excluded.
- In large buildings, a receiver concept can also provide a more robust user experience, e.g. when switching between multiple coverage areas.
In short: Auracast is the standard – receivers are the inclusion and reliability booster.
Why a dedicated receiver remains sensible even in the Auracast era
1) Inclusion: Not all guests have (immediately) a compatible device
Even if the standard prevails, one can rarely assume in public spaces that 100% of listeners have a compatible hearing aid, smartphone, or earbuds with them. Therefore, a loan receiver remains an important component to ensure that truly no one is excluded.
2) Large areas: Multiple transmission cells – but seamless transition is a topic
A single transmitter often only covers a small area well. In larger or more complex buildings, multiple transmitters are needed for stable coverage. At the same time, the seamless transition (“handover”) between multiple transmitter cells with the same audio is not always equally reliable in practice – depending on the device, environment, and movement.
3) Operation & Reliability: Venue receivers are “plannable”
For operators, what matters is: plannable range, defined operation, support process, accessories (neck loops, headphones), docking/charging, and management. A dedicated receiver makes the solution overall more tangible and easier in day-to-day operations.
Technology without jargon: Why large areas need more than “one transmitter”
In a small venue, a single Auracast transmitter may be sufficient. However, in many real-world environments, it looks different: convoluted floor plans, thick walls, multiple floors, or large halls. To ensure stable reception everywhere, multiple transmitters are often used, each covering a specific area – you can think of it like mobile cells.
This is exactly where a dedicated venue receiver can help:
- It can specifically select the best transmitter and optimise the transition.
- For operators, this makes performance more predictable – regardless of which smartphone or earbuds someone brings.
- And it simultaneously closes the inclusion gap for everyone who does not have a compatible device.
Key point: Multiple transmitters ensure coverage – a good receiver ensures that the coverage feels “seamless”.
Hybrid instead of either-or: This is how true accessibility is created during the transition period.
A realistic picture is therefore: coexistence and hybrid operation.
- Existing systems (e.g. hearing loops) remain relevant in many places to provide maximum coverage today.
- Auracast complements the infrastructure as a new standard and makes multi-channel/multi-language streams significantly easier to scale.
- Dedicated receivers fill the gap: for guests without compatible devices and for demanding installations with multiple transmitter cells.
Conclusion: Auracast will become the standard – receivers already make it usable "for everyone" today.
The classic systems have done important work – but they often brought hurdles in operation or use. Auracast is the next logical step because it establishes an open, cross-manufacturer broadcast standard that integrates into consumer and hearing aid ecosystems.
At the same time, it holds true: true inclusion does not arise from "either everyone has it" – but through a concept that supports both its own devices and provides dedicated receivers, enabling stable operation over large areas with multiple transmission cells.
Test Auracast in your location
You want to offer barrier-free audio – with Auracast as the standard and a receiver concept that also includes guests without compatible devices? We will show you what the integration into your existing audio infrastructure can look like – including a coverage concept for larger areas.
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META-DESCRIPTION:Comparison of classic assistive listening solutions and why Auracast is emerging as the new standard – plus why dedicated receivers remain important for inclusion and large areas.