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. 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). Spencer Fuller Colin Rex and Chase . Lefort. Mixers. What is a mixer?. A mixer is a piece of equipment used in the production of audio, by connecting all of the input with the outputs. . What are the different sections of a mixer?. 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. Microphones convert . ACOUSTICAL . energy (sound waves) into . ELECTRICAL . energy (audio signal). Types of microphones. Condenser Microphones. Also referred to as capacitor or electrostatic. Require a power source (Battery or +48v). UCD Access & Lifelong Learning. . What I will cover?. What is HEAR/DARE . HEAR and DARE in UCD . Making a successful application . Key Dates . Other sources of information . UCD Alternative Entry Pathways. Pick-up (Polar) Patterns. Omni-Directional. : Sensitive to sounds from all directions.. Uni. -Directional. : Sensitive to sounds coming from one general direction.. Cardiod. Supercardiod. HyperCardiod. 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). Learning about Poetry “The Ears of An Elephant” If you had the ears of an elephant, You might hear the bugs that crunch On leaves that whisper whooshing words As they’re gobbled up for lunch. Received Signal PreprocessingI/Q DemodulationStatic Vector Effect ReductionPhase ExtractionData CalibrationData ExtractionAudio Signal Detection Inaudible SignalAudio SignalBreathing Rate EstimationPC 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 Date. Lesson 2. Where we are in our learning journey. . Lesson 1. Lesson 2. Lesson 3. Lesson 4. Lesson 5. Lesson 6. Introduction to sound. How we hear. Louder and quieter. Muffling sound. Changing pitch. Outdoor Learning – Listening to Nature. Good morning and welcome to my second weekly . Outdoor Learning. message, which now comes to you each Wednesday. As previously, this update is my chance to send you information and activities that I think might be interesting and fun to learn about and take part in during Lockdown. As always, any activity ideas are just suggestions, and you should not feel any pressure to take part in activities, if they do not work with your home-learning schedule that week. You can always come to things at a time that suits you, . 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?. Abbie Charrier. Senior Director of Youth Programs. acharrier@clubaycc.org. (207)873-0684. This meeting is being recorded. If you want to receive email updates, please put your First name, Last name, and email in the chat.