What Is an Auracast Broadcast Speaker Module PCBA?
An Auracast broadcast speaker module PCBA is a receiver board built on LE Audio that joins a broadcast audio stream instead of pairing with a source. One transmitter serves an unlimited number of receivers, and listeners join by scanning — there is no pairing handshake and no connection limit. The board carries the LE Audio radio, decodes LC3, handles scan and stream selection, and drives the amplifier or line output of the speaker.
Typical Specifications
| Parameter | Typical configuration |
|---|
| Audio standard | LE Audio with Auracast broadcast |
| Codec | LC3, the mandatory codec of LE Audio |
| Receivers per transmitter | Unlimited, no pairing required |
| Join method | Scan and select from the available broadcast streams |
| Profiles | Public Broadcast Profile and Broadcast Audio Scan Service |
| Audio output | Line out, I2S, or an integrated Class-D amplifier stage |
| Power supply | USB 5 V, battery or mains depending on product form |
| Certification support | Bluetooth qualification, RED, FCC, CE |
The values above are the configuration ranges we build to. The final specification is fixed with the customer at project kick-off and verified on the production enclosure.
Typical Applications
- Silent fitness classes and silent events — one stream, any number of participants, no room noise.
- Classroom hearing support — the teacher transmits once and every student receives directly.
- Multilingual guided tours — visitors select a language channel rather than being handed hardware.
- Museum and exhibition audio — location-based audio without a per-visitor device pairing step.
- Airport, station and venue announcements — announcements delivered directly to personal receivers.
- Conference assistive listening — a feed that any attendee can join from their own device.
Core Technologies
- LE Audio broadcast radio — a one-to-many transport that removes the pairing step and the connection ceiling.
- LC3 codec efficiency — LC3 delivers equivalent quality at a materially lower bit rate than SBC, which is what makes one-to-many practical on battery-powered receivers.
- Scan-based stream selection — the receiver lists available broadcasts and the user picks one, which is the interaction model the profiles define.
- Public Broadcast Profile support — the interoperable profile that lets third-party receivers join the same broadcast.
- System integration — amplifier, power and antenna are co-designed so the module performs inside a real speaker enclosure.
Customisation and OEM / ODM Process
- Requirement review — application, acoustic targets, interface list and target cost are fixed in writing.
- Chip selection and schematic — platform options are compared on performance, supply risk and BOM cost.
- PCB layout and DFM — RF, audio and power domains are partitioned for clean grounding and EMC headroom.
- Prototype and acoustic tuning — DSP parameters are tuned on the real enclosure, not on a generic bench.
- Certification support — RED, FCC and CE test plans are prepared and pre-scanned before formal submission.
- Mass production — 8 fully automatic lines handle SMT, testing, ageing and packing with full traceability.
Frequently Asked Questions
How is Auracast different from classic Bluetooth pairing?
Classic Bluetooth is a one-to-one connection that requires pairing and holds a limited number of links. Auracast is one-to-many: the transmitter broadcasts, and any number of receivers join by scanning without a pairing handshake.
Why is LC3 used instead of SBC?
LC3 is the mandatory codec for LE Audio and reaches equivalent perceived quality at a lower bit rate than SBC. Lower bit rate means longer battery life on the receiver and more headroom in the broadcast slot.
How many receivers can join one transmitter?
There is no fixed limit. Receivers are not connected to the transmitter, they simply listen, so the count is bounded by radio coverage rather than by a connection table.
Can the module be integrated into an existing speaker design?
Yes. The module presents line out, I2S or an integrated amplifier stage, and we co-design antenna placement and power with the existing mechanical design.
Does it work alongside classic Bluetooth?
Yes. A product can carry classic Bluetooth for one-to-one listening and an Auracast receiver for broadcast, and we plan the coexistence and antenna work at the layout stage.
