Automatic detection method for uraniscolalia pharyngeal fricatives based on FTSL spectral line

Abstract

The invention discloses an automatic detection method for uraniscolalia pharyngeal fricatives based on a multi-delay four-order-cumulant-octave FTSL spectral line, and relates to the field of voice signal processing. The detection method comprises the following steps: (1) carrying out signal preprocessing, namely, carrying out framing, pre-emphasis and amplitude normalization on input consonant signals; (2) extracting the features of voice signals, namely, extracting FTSL spectral line features in the frequency domain of the multi-delay four-order-cumulant of each frame of voice, and carryingout equal-ratio mean value envelope array extraction in the time domain; and (3) after the time domain and FTSL spectral line signal features of the voice signals are extracted, carrying out automaticclassification on the voice signals by adopting the combined classifier recognition algorithm in combination with the time domain equal-ratio envelope mean value array and the FTSL spectral line features, and outputting the classification result. Compared with the prior art, the method provided by the invention has the advantages that the detection result is objective and accurate, the automaticmeasurement with relatively high degree can be realized, thus reliable reference data are provided for the digital evaluation of pharyngeal fricatives clinically, the accurate medical development demand is conformed, and more accurate and effective signal classification recognition is carried out.

Description

technical field [0001] The invention relates to the field of speech signal processing, in particular to an automatic detection method for pharyngeal fricatives in cleft palate speech based on multi-delay fourth-order cumulant octave band FTSL spectral lines. Background technique [0002] As one of the common compensatory articulation errors, pharyngeal rubbing is second only to glottal stop in incidence. In patients with pharyngeal friction, the tongue retracts to the posterior pharyngeal wall during pronunciation, resulting in narrowing of the pharynx. The airflow from the lungs passes through the narrow channel, and the sound produced by friction is the pharyngeal fricative. The abnormal articulation mainly occurs in the consonant part of Mandarin syllables, because consonants are sounds formed by airflow being obstructed in the oral cavity or pharynx. Pharyngeal fricatives are common in Chinese dialects, but do not appear in normal Mandarin pronunciation. Pharyngeal fri...

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Problems solved by technology

However, the change of each parameter is still a subjective evaluation, and there are still problems of not being objective and accurate enough.

2) Analysis of time-frequency characteristics of pharyngeal fricatives based on digital signal processing technology. Corresponding studies explored the relationship between energy distribution and pharyngeal fricatives, but did not realize automatic classification and detection of pharyngeal fricatives and normal fricatives

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