Adaptive Cancellation of Localised Environmental Noise
Journal Title: Jurnal Kejuruteraan - Year 2018, Vol 30, Issue 2
Abstract
Noise cancellation systems are useful in applications such as speech and speaker recognition systems where the effects of environmental noise have to be taken into considerations. A robust method for the cancellation of localised noise in noisy speech signals using subband decomposition and adaptive filtering is presented and described in this paper. The subband decomposition technique is based on low complexity octave filters that split the noisy speech input into subsidiary bands. A thresholding technique is then applied to the subbands to determine the presence or absence of environmental noise. This is used to control an adaptive filter which only responds to the noisy parts of the speech spectrum hence localising the adaptation process only on these segments. The Normalised Least Mean Squares algorithm (NLMS) is used for the adaptation process. A comparison with a similar system without localising the environmental noise shows the superior performance of the proposed system. It has been shown to perform better in terms of computational costs and convergence rate when compared to a system that does not take advantage of the information regarding the presence or absence of noise in a specific part of the speech spectrum. More than 35 dB of noise has been eliminated in less iterations than in conventional approach which needs longer time to reach steady state.
Authors and Affiliations
Ali O. Abid Noor, Imad H. M. Al-Hussaini, Salina Abdul Samad
Keywords
Related Articles
- EP ID EP455562
- DOI 10.17576/jkukm-2018-30(2)-07
- Views 130
- Downloads 0
A Rapid and Non-Destructive Technique in Determining The Ripeness of Oil Palm Fresh Fruit Bunch (FFB)
Oil palm industry is one of the main industries in Malaysia that contributes to the country’s gross domestic product (GDP). In the oil palm industrial sector, methods of planting, detection and assessment are very import...
Water Quality of Surface Runoff in Loop Two Catchment Area in UKM
For a country that is developing, there is a need to control and maintain the quality of raw water, with adequate quantities to ensure continuous supply of clean water. In Malaysia, urban development activities especiall...
Pembentukan Mikrostruktur Berbentuk Sfera dalam Keadaan Separa Pepejal Aloi Aluminium Al-4.8Si-2.8Cu-0.5Mg (Formation of Spheroidal Microstructure in Semi-solid State of Al-4.8Si-2.8Cu-0.5Mg Aluminium Alloy)
Hasil penyelidikan mengenai pembentukan mikrostruktur berbentuk sfera dalam keadaan separa pepejal aloi aluminium Al-4.8Si-2.8Cu-0.5Mg dibentangkan dalam penulisan ini. Bahan awal aloi aluminium tersebut dihasilkan melal...
Lagrangian Investigation on the Compound Effects of Reclamation and Proposed Tidal Barrage to the Environmental Flow
Large-scale reclamation at Tekong Island, Singapore and the construction of a tidal barrage across Johor River in Kota Tinggi is expected to alter the local hydrodynamics in Johor River Estuary (JRE) and East Tebrau Stra...
Analisis Penyerakan Isyarat Gelombang Mikro Elemen Gelung Segi Tiga dari Pelbagai Jenis Filem Pengalir Lutsinar pada Jalur-Ku (Scattering Microwave Signal Analysis from Triangular Loop Element of Different Transparent Conductive Thin Films at Ku-band)
A study on the performance of scattering Ku-band microwave signals from an element designed with triangular loop shape made of different types of conductive thin fi lm is presented in this paper. In this study, four type...