Bosch Sensortec - Model BMA550 -Acceleration-based Body Sound Sensor
The BMA550 by Bosch Sensortec is an advanced acceleration-based body sound sensor, specifically designed for hearable devices. It addresses challenges in environments with high ambient noise, effectively enhancing voice clarity by filtering out unwanted sound. This accelerometer features significantly reduced noise levels, ranging from 5-7 times lower than typical accelerometers, offering a clear advantage in sound detection. With a low power consumption design, the BMA550 supports a high data rate of up to 48 kHz, allowing for low latency applications. The sensor's compact form factor allows for easy integration into various devices. Additionally, it supports continuous usage through always-on low-power speech processing, making it ideal for perpetual operations in devices like smartwatches, wristbands, and smart clothing. This component plays a crucial role in enhancing voice-based interactions, enabling smooth communication in noisy environments.
The BMA550 sensor for hearables makes a big wave against unwanted sound waves. The innovative accelerometer works as body sound sensor for sensing bone conducted voice. Smart “voice enhancement” filters out distracting noises during phone calls and amplifies your own voice. This means that the person you are talking to can always understand you, even in noisy atmospheres. The BMA features 5-7x lower noise than standard accelerometers, low power consumption and high data rate up to 48 kHz for low latency.
- Package dimensions (typ.) : 2 x 2 x 0.65 mm³
- Digital Resolution : 16 bit
- Supply voltage VDDIO : 1.08 … 3.6 V
- Supply voltage VDD : 1.71 … 3.6 V
- Interface : TDM interface + I2C
- Output data rate : Up to 48 kHz
- Bandwidth : 50 Hz … 2350 Hz
- Noise (in low noise mode) : 1.2 mg-rma @2350 Hz BW
- Total Harmonic Distortion +Noise : 0.25%
- Power consumption :
- 290 µA in low noise mode
- 104 µA in low power mode
- FIFO : 1kb
- Interrupts : FIFO + Voice activity detection