Random Signal Processing

          Processing refers to performing any operations on the signal. The signal can be amplified, integrated, differentiated and rectified. Any noise that corrupts the signal can also be reduced by performing some operations. Signal processing thus involves

• Amplification
                     
• Filtering
                  
• Integration and differentiation
                              
• Nonlinear operations like rectification, squaring, modulation, demodulation etc.

           These operations are performed by passing the input signal to a system that performs the processing. For example, filtering involves selectively emphasising certain frequency components and attenuating others. In low-pass filtering illustrated in Fig.4, high-frequency components are attenuated

.

Figure 4 Low-pass filtering