The following figure depicts a sampled analog signal for digital signal representation. By applying the concept of Pulse Code Modulation find the 4-bit code words and finally draw the line coding by using Bipolar-AMI scheme. You have to solve the problem by using step by step formulation of normalized PAM values, normalized quantized value, normalized error and quantization code. Assume that the sampling amplitudes are between -40V to +40V. Time Analog Signal Value (V)

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Amplitude modulation

A radio signal can carry information in the form of sound or image for broadcasting or communication. For it to be sent to a greater distance, the signal must be changed or modulated in some way. One of the easiest way is to change the amplitude of the signal with variations of the video or the audio signal. This is called Amplitude Modulaton. In this modulation information of message is carried in amplitude of carrier signal.