how is amplitude modulation is achieved

Amplitude modulation
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Amplitude modulation can be achieved by applying the message signal, and the carrier wave, to a non linear (square law device) followed by a band pass filter.
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Amplitude modulation is achieved by superposing a message signal on a carrier wave in a way that causes the amplitude of the carrier wave to change in accordance with the message.
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Amplitude modulation..

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Superimposing message signal
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