In order to have a full representation of a signal in digital form, the signal has to be discrete in amplitude too. The sampled signals from the sampling process are discrete in time but their amplitude is still continuous. For more details on sampling process refer previous sections – 1) Sampling Theorem – Baseband Sampling and 2) Sampling Theorem – bandpass or under sampling. The Sampler converts the analog signal (manifestation of real world physical quantities) to sequence of discrete samples that are uniformly spaced in time. A typical ADC contains the following components/blocks: 1) Sampler 2) Quantizer and 3) Encoder. The above process of converting from analog to digital domain is done by an Analog to Digital Converter (ADC). ![]() The real world physical quantity exist in analog domain and it becomes imperative to convert it to digital domain if we want to send it via a digital communication system. ![]() In a given communication system, we always want to send data that represent real world data representing some physical quantity (be it speech, temperature, etc.,).
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