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Voice over Bluetooth Low Energy

11.09.2015

STMicroelectronics has included a ready-to-use Bluetooth Low Energy voice over channel library in its BlueNRG BLE chip code set. The BLUEVOICELINK1 library is an extension for the STM32Cube software collection. The software runs on the STM32 microcontroller and includes all the necessary drivers and middleware for working with the BlueNRG chip and the MP34DT01-M digital MEMS microphone. The program uses the STM32Cube ecosystem, so it can be easily ported to any MK of the STM32 family.

Developers are offered a ready-made project for the X-NUCLEO-IDB04A1 and X-NUCLEO-CCA02M1 modules, which are connected to the NUCLEO-F401RE development board. Using this set of boards, you can implement a complete voice transmission system from one set of boards via a Bluetooth Low energy wireless channel to another set of the same boards connected to a PC via a USB interface. The receiver kit decompresses the audio data received over the air and sends the audio stream to the PC.

The BLUEVOICE communication profile defines a BLE service that includes one capability for audio transmission and one for synchronization. In a half-duplex system, both sides (central and peripheral) act as information servers (data sources) in the communication process. Periodic notification contains compressed audio data that is sent from one server to one client, depending on the chosen direction - from the central device to the peripheral or vice versa.

The proposed software uses the osxBlueVoice middleware for half-duplex voice transmission (OPEN.AUDIO license) and includes all functions for capturing and compressing the real-time digital stream from the MP34DT01-M microphone. The provided driver implements the “Audio” USB class, which allows the device to be seen on the PC side as a standard USB microphone.

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