Amplitude Shift Keying (ASK) is a Modulation technique that is used in Digital to analog Conversions. This technique uses strength of signal to represent binary 0 or 1 value.in this only amplitude changes while frequency and phase both are kept constant.it uses finite number of amplitudes, each assigned a unique pattern of binary digits that represents binary 1 or 0.
The main Disadvantage of this technique is that unwanted energy or noise from other sources may vary signal amplitude and can change original sent value. Another problem is that Transmission speed is dependent on the physical characteristics of the transmission media.
Figure given below Illustrates it.
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