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A 510-nW Wake-Up Keyword-Spotting Chip Using Serial-FFT-Based MFCC and Binarized
一款基于串行FFT和二进制神经网络的超低功耗唤醒关键词识别芯片
28nm CMOS, 0.41V, 40kHz, 0.51μW, 0.23mm²
关键词识别超低功耗串行FFT二进制神经网络近阈值电压
▸采用串行FFT的梅尔频率倒谱系数特征提取电路
▸小型化二进制深度可分离卷积神经网络分类器
▸帧级增量计算技术与近阈值电压操作
Abstract
We propose a sub- µW always- ON keyword spot-
ting ( µKWS) chip for audio wake-up systems. It is mainly
composed of a neural network (NN) and a feature extraction
(FE) circuit. For significantly reducing the memory footprint and
computational load, four techniques are used to achieve ultra-
low-power consumption: 1) a serial-FFT-based Mel-frequency
cepstrum coefficient circuit is designed for FE, instead of the
common parallel FFT. 2) A small-sized binarized depthwise
separable convolutional NN (D