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In signal processing, sampling is the reduction of a continuous signal to a discrete signal. A common example is the conversion of a sound wave (a continuous signal) to a sequence of samples (a discrete-time signal).
the bandwidth and the signal to noise ratio
A: Noise effect an analog signal by adding or subtracting from the signal
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The error in the phase-modulated (PM) demodulated signal can arise from various factors, including noise, signal distortion, and timing inaccuracies. Noise can introduce random variations in the signal, leading to incorrect phase interpretation. Additionally, any non-idealities in the demodulation process, such as phase jitter or frequency offset, can adversely affect the accuracy of the recovered signal. Finally, limitations in the receiver's bandwidth can result in inadequate capture of the modulated signal, further contributing to errors.