Electronics and Communication Engineering Dept., M S Ramaiah University of Applied Sciences, Bengaluru, Karnataka, India

Biography: Dr. Rohini Deshpande received her Ph. D degree in Electronics and Communication Engg., from Guru Govind Singh Indraprasth University (GGSIPU) New Delhi , M. E degree in Electronics and Communication Engg., from the University of Delhi, with honors and Bacholers degree in Electronics and Communication Engg., from Gulbarga Univeristy. She is currently a professor in Electronics and Communication Engineering Dept., M S Ramaiah University of Applied Sciences, Bengaluru, Karnataka, India. She is involved in research and teaching UG and PG students in the present institute. Her major areas of research are Signal Processing, Optical Networks, Mobile Computation etc.
She has published more than 35 papers in international journals and conferences of repute. She has citation index of 33. She is listed in Marques WHO’S WHO of the world and her bio data is published in pearl edition of 2012. Foundation for Accelerated Community Empowerment (FACE), Delhi has conferred on her the award VIDYA VIBHUSHAN based on the self-profile on 19th April 2015. She has organized many workshops and conferences. She has chaired many sessions in conferences. She is the senior member of IEEE.

Speech Title: Innovative Designs for Special Notch Filters
Abstract:
Design of FIR notch filter with extremely narrow rejection bandwidth
       A novel idea of sharpening of FIR notch filters (NF) for highly narrow rejection bandwidth (RBW) is suggested. Reduction in the RBW is achieved progressively in three stages. In the first stage an FIR notch filter is designed from a second order IIR prototype filter. For a given length L of the NF, we choose maximum permissible value of ‘r’ (the pole length of IIR prototype filter) to achieve very narrow RBW of the FIR filter. In the next stage by using an Amplitude Change Function (ACF) : H(2 - H), the designed filter is sharpened. Consequently, the RBW of the resulting NF is reduced to almost half of the earlier value. This reduction of bandwidth makes the resulting NF of length 2L. In the next stage, RBW can be further reduced by the repeated sharpening of the filter by the same ACF.
Design of FIR notch filter with controlled null width
       A technique for designing a maximally flat, linear phase FIR notch filter with controlled null width is presented in this talk. Design analysis is carried out with first-, third- and fifth-order zero derivative constraints of the amplitude response of the FIR filter at notch frequency. An algorithm is presented for designing maximally flat, linear phase FIR notch filter with specified null width around specified notch frequency with third-order zero derivative constraint at the notch frequency. Detailed analysis susequently shows that the null width of a maximally flat, linear phase FIR notch filter can be controlled by suitable selection of individual zero-odd-order derivatives and also by the successive addition of zero-odd-order derivatives at the notch frequency.
Indexing terms: - FIR notch filter, Amplitude Change Function (ACF), Filter sharpening, Maximally flat, Linear phase, Zero derivative constraint, FIR notch filter