ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: LoudspeakersOutlineReference listTo explore further (survival pointers of web references etc)Major applicationsTypes of LoudspeakersBasic Working Principles – Dynamic LoudspeakersBasic Working Principles – Ribbon LoudspeakersBasic Working Principles – Electrostatic LoudspeakersBasic Working Principles – Piezoelectric MicrophonesMajor SpecificationsLimitationsSample ConfigurationSpeaker selectionManufacturersSlide 16ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Assignment#01: Literature Survey on Sensors and Actuators Topic: LoudspeakersPrepared by:Matthew D. CarneyDept. of Electrical and Computer Engineering Utah State UniversityE: [email protected] ; T: (435)797-4658; F: (435)797-3054 (ECE Dept.)W: http://ususat.usu.edu3/11/200501/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-2Outline –Reference list–To probe further–Major applications–Basic working principle illustrated–A typical sample configuration in application (application notes)–Major specifications–Limitations–And many more relevant issues in applications (such as, how to choose, cost information, where to buy etc.)01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Reference list•http://mechatronics.ece.usu.edu/ece5320/hw01-2004/Clint_E_a.ppt © 2004 Clint Ellis•Bernstein, J, MEMS Air Acoustics Research, Draper Laboratory, DARPA Aug 1999•Friot, E., Bordier, C., Real-time active suppression of scattered acoustic radiation, Journal of Sound and Vibration, 278 (2004) 563-580•Biersdorfer, J.D., Headphones that make the world go away, New York Times, Sept 30, 2004, pg G6•Karnapi, F.A. Gan, W.S., Chong, Y.K., FPGA implementation of parametric loudspeaker system, Microprocessors & Microsystems, Aug 2004, Vol 18 Issue 5/6, p261, 12p01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4To explore further (survival pointers of web references etc) •http://www.siemens-hearing.co.uk/00_uk/10_products/17_technology/Technology.jsp•Sanliturk, K.Y. , Cakar, O. Noise elimination from measured frequency response functions, Mechanical Systems and Signal Processing, May 2005, Vol 19, Issue 3 p615, 17p01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5Major applications •Sound suppression•Noise elimination•Sound recording•Sound amplification01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6Types of Loudspeakers•Dynamic- Similar to dynamic microphones•Electrostatic–Capacitive•Piezoelectric•Planar Magnetic•Ribbon01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Basic Working Principles – Dynamic LoudspeakersDynamic LoudspeakersAs a time varying signal is applied to the coil, it will induce a time varying magnetic field. This field will then interact with a permanet magnet, causing the diaphragm to move, creating sound. Courtesy www.howstuffworks.com01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8Basic Working Principles – Ribbon LoudspeakersThis is similar to a ribbon microphone, only backwards. As the time varying signal is passed into the magnetic field, it will cause the ribbon to vibrate, generating the desired sound01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9Basic Working Principles – Electrostatic LoudspeakersElectrostatic Loudspeakers are similar to capacitive condenser microphones. They use two thin conductive plates and a diaphragm. The diaphragm acts like the dielectric in a capacitor. It will cause the two plates to move, creating sound01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-10Basic Working Principles – Piezoelectric MicrophonesA voltage is applied to the crystal, causing it to flex. This flexing in turn causes the diaphragm to move. As the diaphragm moves, it creates sound waves. Courtesy www.hit.bme.hu01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-11Major Specifications•Frequency Response•Nominal Power•Resonance Frequency•Impedance•Bandwidth01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-12Limitations•Attenuation•Directionality•Sensitivity•Frequency Response01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-13Sample Configuration•Real Time Active Sound Suppression01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-14Speaker selection•Power•Frequency Response–Select speaker for desired frequency•Size•Impedance01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-15Manufacturers•Dynamic–Bose–Phillips–Infinity•Ribbon01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and
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