Note for Audio and Video Engineering - AVE By lokesh j

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Audio Video Systems Code - 6EC5 By: Lokesh Lodha Assistant Professor ECE Department Department of Electronics & Communication Engineering Jaipur National University, Jaipur

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What is Sound….??? Sound is the generalized name given to “acoustic waves” Sound is basically a waveform of energy that is produced by some form of a mechanical vibration The sound waves have frequencies ranging from 16Hz up to 20 kHz but speech range from 300Hz to 3400Hz Sound requires a medium for transmission either through the air, a liquid, or a solid to be “heard” The speed of sound experienced by most of us is about 1000 ft per second or 344 m per second 2

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Microphone Transducer-converts sound pressure variations into electrical signals of the same freq. and phase and of amplitudes in the same proportion as in pressure variations  Early microphones were invented for communication purposes  Later modifications were made to design as the microphone was used more in entertainment industry 3

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Microphone…  Diaphragm—part of microphone which receives the vibration from sound waves  Thickness and material of diaphragm are changed depending on the sound waves you wish to pick up  How it works?  Electrical circuit is used to change these detected vibrations into an electrical signal that “images” the sound with an output voltage or current 4