CS 73 - DIGITAL SIGNAL PROCESSING 
                       IMPORTANT FORMULAS,RESULTS 
                         UNIT: I-SIGNALS AND SYSTEMS 
          Some Elementary Discrete Time Signals: 
          Unit Sample Sequence             Unit Step signal 
                                                                     
          Unit Ramp Signal                Exponential  signal 
                                                                     
          Classification of Discrete-Time Signals: 
                       Energy Signal                               Power Signal 
                                                                    
                                           Periodic Signal: 
                                                   
                                                                                                                       
                    Symmetric(even)                          Antisymmetric (odd) 
                                                                                                               
                 Block Diagram Representation of DT systems 
                           Adder                                           constant multiplier 
                                                                                                                      
                  
                  
                  
     Signal multiplier                                               Unit Delay element 
                                  
     Classification of Discrete-Time Systems: 
              Static      Dynamic 
                                   
            Time invariant 
                            
      
     Time Variant: