On Semi 公司的BelaSigna R261是完整的系統級芯片(SoC)解決方案,采用先進(jìn)的雙麥克風(fēng)噪聲消減算法方法來(lái)降低機械,平穩以及非平穩噪聲,能為膝上型電腦,手機,網(wǎng)絡(luò )攝像機,平板電腦及其它要求更高語(yǔ)音清晰度的語(yǔ)音捕獲應用提供先進(jìn)的雙麥克風(fēng)的噪聲管理,兼容多種編解碼器,基帶芯片和麥克風(fēng),且無(wú)須校準,易于集成, 非常適用于多種嘈雜環(huán)境.本文介紹了BelaSigna R261主要特性,框圖,輸入和輸出級框圖,以及30球和26球WLCSP封裝應用框圖.
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典型應用:
Notebook Computers
Mobile Phones
Tablet PCs
Webcams
Any Portable Audio Application with Voice Pick−up

圖1. BelaSigna R261方框圖:完整音頻處理系統

圖2. BelaSigna R261輸入級框圖

圖3. BelaSigna R261輸處級框圖

圖4. BelaSigna R261 30球WLCSP封裝應用框圖

圖5. BelaSigna R261 26球WLCSP封裝應用框圖