Auracast Broadcast Audio
Key Takeaways:
- Auracast Broadcast Audio is a new wireless sound transmission technology based on Bluetooth LE Audio. Broadcasts can come from a wide array of enabled devices, like PA systems or televisions, and be accessed by an increasing variety of compatible devices.
- One defining feature of Auracast is that it allows a single device to broadcast to multiple receivers. It does this without requiring devices to pair like they would with classic Bluetooth.
- It has the potential to make assistive listening more discreet, especially for users with hearing aids or cochlear implants.
- Widespread adoption will take time, but some assistive devices are already Auracast-enabled and more venues worldwide are beginning to use the technology.
What is Auracast?
Auracast Broadcast Audio is a new technology that allows one device to transmit sound wirelessly to multiple people in range with compatible listening devices, or receivers. Multiple audio streams can broadcast simultaneously, providing the primary audio content along with additional content such as language translation or audio description for people with vision loss. Users select the audio stream that best meets their needs.
Illustration of an Auracast broadcast audio transmission in a public venue to multiple receivers (earbuds and hearing devices). ©Bluetooth SIG
How does Auracast work?
Auracast transmitters can be used in different ways. In meeting rooms and theaters, the transmitter may be connected to the public address system. In other venues, like a restaurant or airport, the transmitter may be built directly into a device, such as a television. The sound from these audio sources is broadcast over one or more streams using Bluetooth LE Audio.
People within range of the broadcast can choose to listen to a particular audio stream with their Auracast-enabled hearing devices or wireless headphones/earbuds. Audio stream selection works similarly to connecting to a Wi-Fi network. Another device, like a smartphone or smart watch, is needed to assist with selecting the audio stream, while the audio itself is transmitted directly to the compatible devices.
What makes Auracast different?
Auracast uses a new audio format that delivers clearer sound quality with less delay than classic Bluetooth. It also doesn’t require a user to pair their device to access the Auracast audio stream. Supporting content, such as simultaneous language translation or audio descriptions, can be provided as different streams from the same broadcasting device.
Because Auracast can stream audio directly to compatible hearing aids, cochlear implants and headphones/earbuds, it can make public listening easier and more discreet for people with hearing loss who use hearing devices. At venues that implement Auracast for assistive listening, individuals with Auracast-enabled hearing devices can receive the audio directly. This would offer an alternative to checking out, wearing and returning extra equipment. However, Auracast receivers, along with neckloops or headphones, will be required to connect with hearing devices that are not yet Auracast-enabled.
What’s next for this technology?
Currently, two hearing device manufacturers offer models that are Auracast-enabled, and places around the world are starting to install Auracast broadcast audio systems. While the number of venues and hearing device manufacturers implementing Auracast is expected to increase, the timeline for widespread adoption of the technology is uncertain. It’s anticipated that existing assistive listening systems, such as hearing loops, FM, infrared (IR) and Wi-Fi, will continue to be used alongside Auracast for some time.
A new international standard for Auracast venues is expected by late 2027. Its goal is to ensure that systems perform properly and provide consistent experiences within and across locations.
What should you consider when purchasing new devices?
Some consumers may hesitate to upgrade to new hearing devices with this technology until a wider selection of compatible products is available. Others who prefer to update their hearing aid or cochlear implant processor sooner should be sure to ask their provider for a model that is both Auracast-enabled and contains a telecoil. This ensures continued access to hearing loops and other assistive listening technologies.
An important note for consumers: Auracast broadcasts can transmit audio streams at different quality levels. Higher-quality audio streams deliver rich sound for music and entertainment, but use more power and have a higher latency (delay). Standard-quality audio streams, which focus on speech clarity, low latency and battery efficiency, are the level used by hearing aids and cochlear implants. Because these two types of audio quality aren’t interchangeable, a product that only broadcasts higher-quality audio streams won’t be compatible with hearing devices. Make sure you know what a device is capable of before buying.
Look for universal assistive listening technology signs indicating Auracast availability.
An important note for facilities: Public venues installing Auracast should confirm their systems are configured to broadcast a standard-quality audio stream so patrons with hearing aids and cochlear implants can reap the benefits of the venue’s investment. Be sure to post visible signage with a global communication accessibility symbol, like the one pictured here.