PPT-BackDoor : Making Microphones Hear Inaudible Sounds

Nirupam Roy Haitham Hassanieh Romit Roy Choudhury University of Illinois at UrbanaChampaign Presented by Chen Shi 02222018 Overview BackDoor System RF Receiver Record high frequency inaudible sound with regular microphone utilizing its hardware nonlinearity. Compact and appealing these button microphones are ideal for custom applications where the microphones are permanently built into the table or panel They provide outstanding pickup range in either an omni or unidirectional version UNOBTRUSIVE MICROP Available in multiple coverage patterns and skin tones and with two different kinds of connectors these microphones are ideal for wireless production applications where concealment is a major concern WCE6 and WCE6i Earset Microphones T ITT T T IP IT The Physics of Sound. Microphones and Cables. Compression. Rarefaction. Hearing. Waveform. Frequency. Hertz. Amplitude . Volume. Analog. Digital. Distortion. Cardioid. Hypercardioid. Supercardioid. Bidirectional. 3. Schedule Change . Viewing Examples. Audio . Principles. Class Schedule. Electromagnetic. Electrostatic/capacitance. Ribbon. Methods of Transduction. Microphone. Weaker signal, requires a pre-amp. Mic level. CS 450 - Nathan Digangi. Trojan Horse. Secret, undocumented routine embedded within a useful program . Execution of the program results in execution of secret code. Not self-replicating (except when attached to a worm). INART 258 Fundamentals of MIDI & Digital Audio. Mark Ballora. , instructor. 1. 2. Recording Fundamentals. Recall the slides from earlier presentations concerning reverberation.... 2. 3. Distance. edits. – The original . Dragnet. television series used a certain approach to cutting dialogue scenes. Audio and video edits tended to be made as straight cuts between the actors without any overlaps as they delivered their lines. It followed this formula: cut to actor A – deliver the line; cut to actor B – deliver the line; cut back to actor A and so on. . Metasploit. in Kali-Linux 2016. By Shain Amzovski. Metasploitable. Intentionally vulnerable Linux Virtual Machine.. This VM can be used to conduct security training, test security tools, and practice common penetration testing techniques.. K Hero is Australia's No.1 Brand for portable karaoke microphones, karaoke machines, wireless microphones and many other products. Shop with us to sing anywhere, anytime! https://www.khero.com.au/ K Hero is Australia's No.1 Brand for portable karaoke microphones, karaoke machines, wireless microphones and many other products. Shop with us to sing anywhere, anytime! https://www.khero.com.au/ We adopt . amplitude modulation . in step 3 and add the same carrier wave in the final step.. Inaudible Voice Commands. Liwei Song, Prateek Mittal. Department of Electrical Engineering, Princeton University. mostly/roughly pitched longer x0000 6 sec constantly overlapping no silences Mass beyond phase Pass sounds between each other slowly developing Do not end your sound unless you hear another player nea Different types of microphone have different ways of converting energy but they all share one thing in common: The diaphragm. This is a thin piece of material (such as paper, plastic or . aluminum) . A bit about microphones. A microphone is a transducer.. What does that mean?. A bit about microphones. Based on what you have read, there are six microphone designs.. What are the ones you will more likely encounter?.