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滤波器
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滤波器
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This solution delivers bidirectional wireless audio communication with high quality audio and very low power consumption, and is highly suitable for smart home and industry applications such as audio entertainment & gaming, wireless speakers, PC peripherals headsets, wearables for music streaming from smartphone as well as voice control TV remote.
The speech processing chain begins with the MP34DT06J digital MEMS microphone, which converts incoming audio into pulse density modulation (PDM) format. An extremely low-power STM32WB Series MCU with embedded Bluetooth® Low Energy certified transceiver proceeds to further convert and compress the digital audio signal in Opus format, before sending wireless BLE data packets to an identical system for decoding and subsequent streaming through a USB audio out interface.
This microcontroller simplifies bidirectional communication with DSP instruction set for rapid audio signal processing and embedded RF radio compliant with Bluetooth® Low Energy v5.0, in an architecture specifically designed for minimal power consumption.
This very low power microphone outputs high quality, low noise digital audio signals, ready for rapid conversion and transmission over a suitable wired or wireless protocol such as Bluetooth® Low Energy.
This evaluation system for full-duplex streaming of Opus format audio over Bluetooth® 5.0 requires the setup of two nodes with identical hardware, consisting of an STM32WB5MM-DK discovery board (development board with STM32WB5M Module). One node is configured as the central node, while the other as the peripheral node, each able to act as transmitter and receiver at the same time. Once the FP-AUD-BVLINKWB1 STM32Cube function pack with necessary hardware drivers and encoding software is loaded on the Nucleo-64 development board microcontroller and the nodes are appropriately configured, audio acquired by the digital MEMS microphone on the Tx side is compressed and transmitted across a wireless pairing to the Rx side, where the received audio is decompressed and sent via USB configured as an audio out interface.
Estimated cost
Estimated cost is an approximate order cost without tax and shipment. Final cost (products, TAX and shipping) will be provided at the check-out.
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All Evaluation Features
STM32WB5MMG ultra-low power certified 2.4GHz wireless module
2.4 GHz RF transceiver supporting Bluetooth® specification v5.0 and IEEE 802.15.4-2011 PHY and MAC
Dedicated Arm® 32-bit Cortex® M0+ CPU for real-time Radio layer
Integrated PCB antenna or footprint for SMA connector
On-board socket for CR2032 battery
Support of a wide choice of Integrated Development Environments (IDEs), including IAR™, Keil®, GCC-based IDEs, Arm® Mbed™
2 MP34DT06J digital MEMS microphones
Firmware to implement full-duplex communication over Bluetooth® Low Energy using Opus codec
BlueVoiceOPUS customized profile for audio over BLE, including APIs to exploit advanced Opus functionality (source code available)
Third-party Opus v1.3 (downloadable from https://www.opus-codec.org) middleware
