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Analog Communications are the transmission method of conveying information using a continuous signal which varies in amplitude, phase or some other property in proportion to that information. It could be the transfer of a analog source signal, using an analog modulation method such as frequency modulation or amplitude modulation or no modulation at all. Some textbooks more

Analog Communications are the transmission method of conveying information using a continuous signal which varies in amplitude, phase or some other property in proportion to that information. It could be the transfer of a analog source signal, using an analog modulation method such as frequency modulation or amplitude modulation or no modulation at all. Some textbooks also consider passband data transmission using a digital modulation method such as ASK, PSK and QAM - i.e. - a sine wave modulated by a digital bit-stream, as analog communication and as an analog signal. Others define that as digital transmission and as a digital signal.

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