discussion_1 - Discussion 1 - YSR 1. A/D and D/A conversion...

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Discussion 1 - YSR 1. A/D and D/A conversion Any band-limited random process can be completely represented by its samples (A/D) and the original process can be completely reconstructed (D/A) with the samples. (See lecture note 2-18) So, in digital communication systems, analog source is sampled at A/D, the samples are transmitted through a channel and the analog information is reconstructed with the received samples at D/A. (See lecture note 2-20) 2. Quantization Since the samples can have continuous amplitudes (infinite kinds), they are needed to be mapped to a finite set of amplitudes and (amplitude) quantizing is the task of this mapping. (See lecture note 2-20, LPF Æ Sampler Æ Quantizer) A quantizer is defined by the number, size, and location of its quantizing levels or step boundaries, and the corresponding step sizes. For the given μ -law A/D characteristic, the transfer function can be found and it will help us to understand how it works.
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discussion_1 - Discussion 1 - YSR 1. A/D and D/A conversion...

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