Determining polarity of speech signals based on gradient of spurious glottal waveforms
نویسندگان
چکیده
Speech po1arit.y is crucial in many speec:t~ processing firlds. \Ve present, a nowl method to detrrrnine polarity of speech signals from gradient of spurious glot.t,al wavcsforms. VVe u&e t,he iterative adaptive LPC inverse filtering to cancel c:ff’ect of vocal t,ract transfer function while maintaining the most properties of source excitation. l’hcr~ we take the first-derivative (gradient. component) of spurious glottal waveforms t,o capture thr sharp gradient. near the glottal closure inst,ant. Hy using the gradient components of the spurious glottal waveforms. we det.ect, speech polarit!‘, i.e.. the polaiity of glottal waveforms, by finding whether the glot.tal closure instants are located above or below the zero-line. Furt hc~rmore. a frame-based decision technique is applied to get robust rcssult,s. Experimental resu1t.s with a wide varict,y of spc,t:c:h utterances reveal a high performauce and the c.omputation complexity is much mart: Ic+ than a previously proposed method.
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