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KMID : 0917519990060010163
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Journal of Speech Sciences
1999 Volume.6 No. 1 p.163 ~ p.179
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Speech Quality Measure in a Mobile Communication System Using PLP Cepstral Distance with CMS
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Abstract
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For the set up, management and repair of a mobile communication system, continuous estimation of speech quality is required. Speech quality measurement can be conducted by listerner´s judgement in a subjective test such as MOS (Mean Opinion Score) test. However, this method is laborious, expensive and time-consuming, it is advisable to predict subjective speech quality via objective measures.
This paper presents a robust objective speech quality measure,PLP-CMS (Perceptual Linear Predictive-Cepstral Mean Subtraction), which can predict subjective speech quality in mobile communication systems. PLP-CMS has a high correlation with subjective quality owing PLP (Perceptual Linear Predictive) analysis and shows a robust performance not being influenced by PSTN (Public Switched Telephone Network) channel effects due to CMS (Cepstral Mean Subtraction).
To prove the performance of out proposed algorithm, we carried out subjective and objective quality estimation on speech samples which are variously distorted in a real mobile communication system. As a result, we demonstrated that PLP-CMS has a higher correlation with subjective quality than PSQM (Perceptual Speech Quality Measure) and PLP-CD (Perceptual Linear Predictive-Cepstral Distance).
Keyword: PLP-CMS, MOS, speech quality measure, channel effect
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KEYWORD
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