LMS-Based Adaptive Filtering Technique for Removing Noise from Voice Signals and Its Comparison with RLS-Based Type (Published)
Every adaptive filter requires an appropriate adaptive algorithm to effectively remove noise components from noise-contaminated desired signals. In line with the requirement finite impulse response filters can be driven by an appropriate adaptive algorithm to remove noise from voice signals. Without the removal, the noise components will degrade the quality of the signal, and the result will be a distortion and substantial loss of message content. In this paper a finite impulse response digital filter driven by least mean square adaptive algorithm for coefficient update is designed to remove overlapping noise component from a voice signal. A real voice statement “Creative Research is Very Essential for the Sustainable Development of Any Nation” is converted to electrical voice signal using microphone and stored in a file in a computer system. With “audioread” command the stored voice signal is loaded into a matlab edit window. The loaded signal is contaminated with a 10.5dB additive white Gaussian noise component generated with matlab. When the contaminated signal is applied to the designed filter the result shows that the noise is effectively removed. The result is evaluated with six properties; listening, signal morphologies, frequency domain analysis, noise attenuation, mean square error, and signal to noise ratio. A comparison of the LMS algorithm and recursive least square algorithm with respect to noise removal from voice signals is performed. The matlab codes for the simulation of this work are provided in this paper.
Methodological approaches and efforts towards attainment of excellence in higher education, as the most powerful instrument for social and economic advancement, are undergoing major changes technologically and otherwise. For the university to play a leading role in the ever-changing world of globalization, internationalization, and digitalization; the university curriculum must necessarily be adapted to suit the Revolutionary Information Age that we live in. Learning Management Systems (LMSs) are used all over Higher Education Institutions (HEI) in Europe, North America, South America, Asia, Oceania, and most countries in Africa for the purpose. The need to acquire, know, understand, and actually use LMS in the Third World countries as in the Developed World has arisen and is rapidly increasing aggressively in today’s ever-changing globalized digital knowledge economy. Unfortunately however, LMS is not yet in use in any of the universities in Nigeria as a function of lack of information about how LMSs are being used, where and how to acquire LMSs, and which LMSs are the most adopted elsewhere in the world. This research aimed at, and provided the requisite information for universities to easily acquire, develop and use LMSs for effective delivery of higher education to meet the internationalization and globalization needs of the Revolutionary Information Age
Keywords: Adaptation, Changing world, Excellence in higher education, Globalization, Internationalization, LMS, LMSs, Learning Management System, List of top LMSs, Revolutionary Information Age, University curriculum