WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 11, 2012
Efficient Signal Quality Improvement Approach for Wideband VoIP System in Pervasive Environment
Authors: , ,
Abstract: Voice over Internet Protocol (VoIP) is a the best alternative to the traditional voice communication system, since VoIP system converges the data, voice and video data and reduces the cost of call transmission by passing packets through the available bandwidth through internet protocol. Since the environmental noise may affect the intelligibility of the speech signal, so it is desirable to use the speech processing methods to enhance the quality and intelligibility of the speech signal. The proposed scheme, interpolated finite impulse response (IFIR), is implemented as post-processor after decoding the signal in wideband VoIP system. The performance of the proposed scheme is evaluated for various types of noises at different network conditions. The results of the proposed scheme are measured with the wideband-extension to perceptual evaluation of speech quality measurement (WB-PESQ) for wideband signal. The performance of the proposed system is compared with the existing techniques for quality improvement in VoIP system. The results show much improvement in speech quality with proposed scheme in comparison to other similar schemes.