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Understanding Radio Communication Systems

Learn how sound waves are converted to electrical signals and modulated onto radio waves for transmission. Discover the process of modulation and how radios extract sound information for output through speakers.

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Understanding Radio Communication Systems

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Presentation Transcript

  1. Communication System Joey Porter

  2. Input • A sound wave is produced with a frequency of 5 Hz - 20 kHz. • A microphone converts the sound wave into an electrical signal. • The electrical wave is used to encode or modulate a high-frequency "carrier" radio wave. The carrier wave itself does not include any of the sound information until it has been modulated.

  3. Process • The electrical wave is used to encode or modulate a high-frequency "carrier" radio wave. The carrier wave itself does not include any of the sound information until it has been modulated. • The carrier wave can either be amplitude modulated (AM, top) by the electrical signal, or frequency modulated (FM, bottom). • The signal is transmitted by a radio broadcast tower.

  4. Output • The signal is transmitted by a radio broadcast tower.

  5. Feedback • Your radio contains an antenna to detect the transmitted signal, a tuner to pick out the desired frequency, a demodulator to extract the original sound wave from the transmitted signal, and an amplifier which sends the signal to the speakers. The speakers convert the electrical signal into physical vibrations (sound).

  6. The End

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