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A new spectral ratio method is proposed in this paper for detecting whispered segments within a normally phonated speech stream. The method is based on computing the ratio of the Linear Prediction(LP) spectrum to the Minimum Variance Distortion less Response (MVDR) spectrum. Both the linear prediction method and the LP residual method by themselves are found to be inadequate in modelling medium to high frequencies in the speech signal. On the contrary, the MVDR method shows robustness in modelling spectra of all frequencies. This difference in spectral estimation between the two is utilized in the proposed spectral ratio method to separate whispered segments having less harmonics and more noise from normally phonated segments of speech.
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