On Semi 公司的BelaSigna R261是完整的系统级芯片(SoC)解决方案,采用先进的双麦克风噪声消减算法方法来降低机械,平稳以及非平稳噪声,能为膝上型电脑,手机,网络摄像机,平板电脑及其它要求更高语音清晰度的语音捕获应用提供先进的双麦克风的噪声管理,兼容多种编解码器,基带芯片和麦克风,且无须校准,易于集成, 非常适用于多种嘈杂环境.本文介绍了BelaSigna R261主要特性,框图,输入和输出级框图,以及30球和26球WLCSP封装应用框图.
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, Far−Talk and Custom Mode
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:
Notebook Computers
Mobile Phones
Tablet PCs
Webcams
Any Portable Audio Application with Voice Pick−up

图1. BelaSigna R261方框图:完整音频处理系统

图2. BelaSigna R261输入级框图

图3. BelaSigna R261输处级框图

图4. BelaSigna R261 30球WLCSP封装应用框图

图5. BelaSigna R261 26球WLCSP封装应用框图