0 T 0 T The Finite Impulse Response (FIR) filter is a digital filter widely used in Digital Signal Processing applications in various fields like imaging, instrumentation, communications, etc.However, in realizing a large-order filter many complex computations are needed which affects the performance of the common digital signal processors in terms of Area, Power, speed, cost, flexibility, etc.Multiple Constant Multiplication (MCM) and Common Sub expression Elimination (CSE) techniques are

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... mely effective to improve overall system performance. The FIR filter implementation using MCM and CSE techniques reduce the Area of filter by reducing the number of operators. 0 T In this paper, FIR filter is implemented using MCM and CSE techniques. Direct-form approach in realizing a digital filter is considered. MCM and CSE approach gives a better performance than the common filter structures in terms of speed of operation, cost, and power consumption in real-time. The FIR filter simulated with the help of Xilinx ISE (Integrated Software Environment) 14.5. For the realization of FIR filter using direct form, FDA (4 2 T Filter Design and Analysis)4 2 T tool can also be used. For an N order filter the number of shift register and adders required is N and the number of multipliers required is N+1 in direct form. These filters can work in real time. 0 T