Transcription of Introduction to Communication Systems
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Introduction to Communication Systems
Introduction to Communication Systems James Flynn Sharlene Katz Communications System Diagram July 1, 2010 Flynn/Katz - SDR 2 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Communications System Diagram July 1, 2010 Flynn/Katz - SDR 3 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Information Source: Audio, image, text, data Input Transducer: Converts source to electric signal Microphone Camera Keyboard Communications System Diagram July 1, 2010 Flynn/Katz - SDR 4 Information Source and Input Transducer Transmitter Channel Receiver Output Transducer Output Transducer: Converts electric signal to useable form Speaker Monitor Communications System Diagram July 1, 2010 Flynn/Katz - SDR 5 Information Source and Input Tra
Why do we need Modulation/Demodulation? 13 Flynn/Katz - SDR July 1, 2010 Example: Radio transmission Voice Microphone Electric signal, 20 Hz – 20 KHz Transmitter Antenna: Size requirement > 1/10 wavelength At 3 KHz: Antenna too large! Use modulation to transfer information to a higher frequency λ= c f = 3×108 3×103 =105=100km ⇒.1λ=10km
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