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01:34:39

Amplitude shift keying. The input (digital signal in unipolar NRZ  format) is applied to the base of transistor and the carrier is applied to collector. 
Input 1 - carrier is present. (1×carrier=carrier)
Input 0 - carrier is absent.   (0×carrier=0)
The input(message) is multiplied with the carrier, if the input is 1 we will get the carrier at the output. If the input is zero,the output is also zero.

published 10 years ago

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