![]() It conveys two analog message signals, or two digital bit streams, by changing ( modulating) the amplitudes of two carrier waves, using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) analog modulation scheme. ![]() Quadrature amplitude modulation ( QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information.
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