Abstract—In this paper, we face the problem of constructing a robust feature space for automatic classification of signals from narrow-band in-air ultrasonic sensors. In consideration of the existing sensor bandwidth restrictions, the importance of
文献：Air-coupled ultrasonic time-of-flight measurement system using amplitude-modulated and phase inverted driving signal for accurate distance measurements 关键词：自干涉；超声波
Ultrasonic []() Ultrasonic is free and open-source music streaming Android client for Subsonic API (version 1.7.0 or higher) compatible servers. Download App is available to download at following stores: Bugs and issues First, see if your issue have
