A Hybrid Descent Method for Optimal Sigmoid Filter Design
Kit Yan Chan, Sven Erik Nordholm, Siow Yong Low, Pei Chee Yong, Ka Fai Cedric Yiu · IEEE Signal Processing Letters · 2014
In this letter, a hybrid descent method is used to determine a set of filter parameters for a sigmoid filter which attempts to work under various SNR conditions. It overcomes the limitations of the current sigmoid filters that performs effectively only at a single SNR. Results show that significant improvement in terms of better speech qualities can be achieved by the proposed sigmoid filter when working under various SNR conditions.