一种回声消除和噪声抑制SoC芯片  

An Echo Cancellation and Noise Suppression SoC Chip

作　　者：叶波[1,2] 李天望[3] 罗敏 

机构地区：[1]上海电力学院计算机与信息工程学院,上海200090 [2]上海士博微电子股份有限公司,上海201204 [3]武汉大学集成电路与通讯软件系,湖北武汉430079 [4]朗讯科技光网络有限公司,上海200233

出　　处：《电子学报》2009年第8期1789-1793,共5页Acta Electronica Sinica

基　　金：国家科技部技术创新基金(No.07C26213101259)

摘　　要：提出了一种回声消除和噪声抑制算法,采用改进的自适应步长非线性滤波技术,用单芯片对该算法进行了实现.用180nm 3.3V/1.8V 6层金属混合信号CMOS工艺流片,可达70dB的声学回声消除性能,噪音消除达20dB,侧音消除达30dB.该芯片包含1个16位DSP、3个14位Σ-ΔADC、2个16位Σ-ΔDAC、以及内置ROM和RAM等,并集成有USB、UART、I^2C和PCM等接口.测试结果表明该芯片具有全双工和远距离免提的功能,支持双路麦克风输入,技术规范符合G.165国际标准.该芯片功耗低,外围电路简单,自适应能力强,可广泛应用于蓝牙车载免提通信、GPS和即时通讯等领域.An echo cancellation and noise suppression algorithm is presented by using improved adaptive step-size non-linear filter technology,and a single-chip implementation for this algorithm is proposed. This chip is fabricated in a 3.3V/1.8V 6-metal 180 nm mixed-signal CMOS process,and its acoustic echo cancellation performance can reach 70 dB,noise suppression performance is 20 dB and side tone cancellation is 30 dB. This chip includes a 16-bit DSP, three 14-bit sigma-delta ADC, two 16-bit sigma-delta DAC and embedded ROMs and RAMs, which also provides USB, UART, I^2C and PCM interfaces. Experimental results show that the chip supports full-duplex mode,faraway hand-flee function and dual microphones input and it complies with ITU-T G. 165 standard. With very low power consumption, simple peripheral circuits and strong self adaptation capability, it can be widely used in various applications such as portable Bluetooth hand-free car kit, GPS and instant communication.

关 键 词：回声消除 噪声抑制 免提通信 SOC芯片 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TP211[自动化与计算机技术—计算机科学与技术]