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Communications system
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===<span lang="ms" dir="ltr">Sources</span>=== Sources can be classified as '''electric''' or '''non-electric'''; they are the origins of a message or input signal. Examples of sources include but are not limited to the following: * [[Audio files]] (MP3, WAV, etc...) * [[GIF|Graphic Image Files]] (GIFs) * [[Email|Email Messages]] * [[Human voice]] * [[Cathode-ray tube|Television Picture]] * [[Electromagnetic radiation]]
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