The most important thing in life is human communication.
Communication is the exchange of information between the two places, either in form of information that
sound, images, and data. For a short distance away it is necessary for the processing stage can distribute information in a communication system.
Voice communication signal to a certain frequency can not be directly lower
emanated because the antenna will need a long one. Then a voice signal is first ditumpangkan on the radio signal with a higher frequency signal from the sound, this is called modulation.
Menumpangkan method for voice signal on the radio signals is called modulation.
Modulation which is often used amplitudo modulation (AM - Amplitude
Modulation), frequency modulation (FM - Frequency Modulation) and phase modulation
(PM - Phase Modulation). In its development, be more resistant FM
AM compared to the roar, so that the FM is able to improve the performance of radio communications.
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