电子学报2025，Vol.53Issue(3)：986-999,14.DOI:10.12263/DZXB.20240237
基于超声波非线性的汉语语音防窃听方法
Microphone Jamming Against Eavesdropping on Chinese Based on Ultrasonic Non-Linearity
摘要
Abstract
The privacy and security of speech are fundamental to both national and personal information security.To protect users'speeches from being eavesdropped on,ultrasonic microphone jammers are widely utilized.These jammers uti-lize the nonlinear characteristics of ultrasound in digital recording devices to inject noise into microphones efficiently and cost-effectively,without disrupting normal communication or human hearing.However,existing microphone jammers are vulnerable.They merely introduce simple noise to mask speeches.As a result,eavesdroppers can employ advanced denois-ing techniques to recover speech information,posing a significant threat to speech privacy and security.Moreover,existing jammers have primarily been designed for English speech,limiting their applicability to Chinese speech.Therefore,there is an urgent need for privacy protection for Chinese speech.To enhance the security and adaptability of ultrasonic microphone jammers,this paper introduces a robust jammer for Chinese speech privacy protection.Based on the unique characteristics of Chinese phonetics,we design a coherent noise generation algorithm,which produces real-time ultrasound noise intimately coupled with the protected speech signal.This noise is designed to be difficult for adversaries to separate from the speech,en-suring that any attempts at eavesdropping will be frustrated.Comprehensively considering the capabilities of the potential ad-versaries adversary,our proposed jammer realizes the robust protection against eavesdropping.The generated noise cannot be removed by adversaries using state-of-the-art denoising techniques and is imperceptible to human hearing.Thereby,we comprehensively safeguard speech privacy and security.We develop a prototype of the proposed ultrasonic microphone jam-mer to validate its effectiveness.Experimental results demonstrate that over 90%of protected speeches remain unrecogniz-able to adversaries within a range of 6 meters under the protection of the proposed jammer,even if the adversary adopts state-of-the-art denoising techniques.Therefore,we provide robust technical support to protect Chinese speech privacy.关键词
语音安全与隐私/物联网安全/移动感知与安全/汉语语音/超声波非线性Key words
speech security and privacy/internet of things security/mobile security/Chinese phonetics/ultrasonic non-linearity分类
计算机与自动化引用本文复制引用
高铭,陈奕可,陈佳彤,肖甫,韩劲松..基于超声波非线性的汉语语音防窃听方法[J].电子学报,2025,53(3):986-999,14.基金项目
国家杰出青年科学基金(No.62125203) （No.62125203）
国家自然科学基金(No.62372400) National Science Fund for Distinguished Young Scholars of China(No.62125203) （No.62372400）
National Natural Science Foundation of China(No.62372400) （No.62372400）
