期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 51, 期 4, 页码 979-991出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2015.2501426
关键词
Amorphous silicon (a-Si); critically sampled; flexible electronics; large area electronics; microphone array; source separation; thin-film; thin-film transistors (TFT)
资金
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [1218206] Funding Source: National Science Foundation
We present a system for reconstructing-independent voice commands from two simultaneous speakers, based on an array of spatially distributed microphones. It adopts a hybrid architecture, combining large-area electronics (LAE), which enables a physically expansive array (>1 m width), and a CMOS IC, which provides superior transistors for readout and signal processing. The array enables us to: 1) select microphones closest to the speakers to receive the highest SNR signal; 2) use multiple spatially diverse microphones to enhance robustness to variations due to microphones and sound propagation in a practical room. Each channel consists of a thin-film transducer formed from polyvinylidene fluoride (PVDF), a piezopolymer, and a localized amplifier composed of amorphous silicon (a-Si) thin-film transistors (TFTs). Each channel is sequentially sampled by a TFT scanning circuit, to reduce the number of interfaces between the large-area electronics (LAE) and CMOS IC. A reconstruction algorithm is proposed, which exploits the measured transfer function between each speaker and microphone, to separate two simultaneous speakers. The algorithm overcomes 1) sampling-rate limitations of the scanning circuits and 2) sensitivities to microphone placement and directionality. An entire system with eight channels is demonstrated, acquiring and reconstructing two simultaneous audio signals at 2 m distance from the array achieving a signal-to-interferer (SIR) ratio improvement of similar to 12 dB.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据