(b) Pulse Code Modulation (PCM) transforms analogue signals into binary digits where it has to be translated into electrical pulses before transmitting in the baseband channel. Each bit in the PCM sequence has bit time slot T = 0.5 ms and the PCM bits as follows: 1010 1100 0110 (i) Convert the binary digits into its basic pulse waveform representation and delay modulation waveform. (ii) Explain the differences of the converted PCM waveforms in Q4(b)(i).
Quantization and Resolution
Quantization is a methodology of carrying out signal modulation by the process of mapping input values from an infinitely long set of continuous values to a smaller set of finite values. Quantization forms the basic algorithm for lossy compression algorithms and represents a given analog signal into digital signals. In other words, these algorithms form the base of an analog-to-digital converter. Devices that process the algorithm of quantization are known as a quantizer. These devices aid in rounding off (approximation) the errors of an input function called the quantized value.
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