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Modulator

Modulator. By: Engr. Syed Asad Ail. Communication. Communication is the process of Exchanging Information Communication Can Be Local Remote Verbal Or Non-Verbal. Communication system. Telephones Radios Television Computer Communication Email Internet Skype. COMMUNICATION MODEL.

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Modulator

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  1. Modulator By: Engr. Syed Asad Ail

  2. Communication • Communication is the process of Exchanging Information • Communication Can Be • Local • Remote • Verbal Or Non-Verbal

  3. Communication system • Telephones • Radios • Television • Computer Communication • Email • Internet • Skype

  4. COMMUNICATION MODEL

  5. Modulation • Process of Varying one of the characteristics of the High Frequency signal in accordance with the Information Signal. • Device that this perform is known as Modulator • Characteristics • Frequency, Amplitude and Phase • Types • Frequency Modulation • Amplitude Modulation • Phase Modulation

  6. Example

  7. Why Modulation • Voice Signal has Low Frequency • Requires Large Antenna • To Avoid Interference • To Cover Larger Distance

  8. example • The audio signals have relatively short wavelengths • The size of antenna should be at least λ/4,  = c/f  = 3x108/20000 = 15000  / 4 = 3750m = 3.75 km  This much size of antenna is practically impossible. • If more than one station starts transmitting at the same AF (Audio Frequency) there would be a lot of interference.

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