超声调制的声频定向传播性能分析  

The analysis of audio directional transmission performance on ultrasound-modulated

作　　者：汤惠[1] 徐涛[1] 陈飞洋[1] 黄虎[1] 

机构地区：[1]成都理工大学信息科学与技术学院,四川成都610059

出　　处：《电声技术》2016年第3期57-60,共4页Audio Engineering

摘　　要：研制了一种声频定向传播系统,设计了数字调幅方式声频定向系统及其实验装置。利用声频定向系统试验装置,验证了将音频信号调制到超声载波上,经空气非线性作用解调后可以产生具有指向性的声频信号。随着调制频率的不断上升,输出的差频信号越大,高频谐波噪声越小,即调制频率差越大,空气对声波的非线性交互作用越强。This paper developed a kind of audio directional transmission system, designing the digital AM mode directional system and its experimental devices.Using audio directional system test device equipment to verify the audio signals modula- ted onto the carrier ultrasound can produce a directional audio signal demodulated by the nonlinear interaction of air. With the rising of modulation frequency, the greater the difference frequency of the output signal, the high frequency harmonic noise is smaller, which is the greater the difference of the modulation frequency, the stronger the nonlinear interaction of sound waves from air.

关 键 词：电视录音 声频定向 差频信号 数字调幅 自解调 

分 类 号：TN912[电子电信—通信与信息系统]