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Designing of sharp transition low pass FIR filter using multistage FRM approach

In communication and speech processing applications, Finite Impulse Response (FIR) filters are constantly preferred as they adequately reduce the aliasing effect between two neighbouring channels and furthermore for de-noising. FIR filters with narrow transition-band are required in almost all kind of modern signal processing applications. In this paper, Frequency Response Masking (FRM) approach has been utilized to reduce the transition-width. This paper is mainly concerned with designing of a sharp low pass FIR filter based on multistage FRM structure and also demonstrates the benefit of this design. The filter structure consists of a network of several sub filters. The result demonstrates a sharp low pass FIR filter with extremely narrow transition-bandwidth and lower side lobes. Several graphs have been incorporated in order to establish the effectiveness of proposed approach and furthermore to compare the outcome with the outcome of existing filter design strategies.