On Semi 公司的BelaSigna R261是完整的系统级芯片解决方案,能为便携式电脑,平板电脑,手机和其它手提音频设备提供双麦克风的降低噪音,提高语音清晰度. BelaSigna R261和各种的CODEC,基带芯片和麦克风兼容,不需要校准.主要用在便携式电脑,平板电脑,手机和其它手提音频设备.本文介绍了BelaSigna R261主要特性, 架构图,典型应用电路和接地方案图.
Advanced Noise Reduction Solution for Voice Capture Devices
BelaSignaR261 is a complete system−on−chip (SoC) solution that provides advanced dual−microphone noise reduction in voice capture applications such as laptops, mobile phones, webcams, tablet computers and other applications that will benefit from improved voice clarity.
Featuring a novel approach to removing mechanical, stationary and non−stationary noise, the chip preserves voice naturalness for greater speech intelligibility even when the talker is further away or not optimally aligned with microphones providing unmatched freedom of movement for end−users. Designed to be compatible with a wide range of codecs, baseband chips and microphones without the need for calibration, BelaSigna R261 is easy to integrate, improving manufacturers’ speed to market.
Additional features include the ability to customize multiple voice capture modes and tune the algorithm to the unique needs of a manufacturer’s device. The chip includes a highly optimized DSP−based application controller with industry−leading energy efficiency and is packaged in two highly compact 5.3 mm2 WLCSPs to fit into even the most sized−constrained architectures and allow the use of the cheapest printed circuit board design technologies.

BelaSigna R261主要特性:
Advanced Two−Microphone Noise Reduction Algorithm
Preserves Voice Naturalness
Supports Close−Talk and Far−Talk
Conference Mode enables 360 Degrees Voice Pick−up
Configurable Algorithm Performance
Ultra Low Power Consumption
Ultra Miniature Form Factor
Complete System−on−Chip (SoC)
Highly Flexible Clocking Architecture
Hardware Configuration Interfaces
Prototyping Tools
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

BelaSigna R261典型应用:
Laptop Computers
Mobile Phones
Tablet PCs
Webcams
Any Portable Audio Application with Voice Pick−up

图1.BelaSigna R261架构图

图2.BelaSigna R261典型应用电路图(1)
 
图3.BelaSigna R261典型应用电路图(2)

图3.BelaSigna R261接地电路图