What distinguishes digital radio systems from conventional analog communications system?

What distinguishes digital radio systems from  conventional analog communications  system?
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1 Answer

Answer :

the nature of the modulating  signal
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It is used to encode the minimum amount of speech information necessary to reproduce a perceptible message with a fewer bits that those needed by a conventional encoder/decoder

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In a radio receiver with simple AGC:

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Used for transmission of PCM encoded time – division multiplexed digital signal.

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Can digital radio communications be formatted to know whether a signal went through?

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Which performance parameter is the minimum amount of optical power required to achieve a specific bit-error rate (BER) in digital systems or a given signal-to-noise ratio (SNR) in analog systems?

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