Automatic detection method of pharyngeal fricatives in cleft palate speech based on ftsl spectral lines

Abstract

The invention discloses an automatic detection method for pharyngeal fricatives in cleft palate speech based on multi-delay fourth-order cumulant octave band FTSL spectral lines, and relates to the field of speech signal processing. The detection method includes (1) signal preprocessing, which divides the input consonant signal into frames, pre-emphasizes and normalizes the amplitude; (2) extracts the characteristics of the speech signal, including the frequency Extract the features of FTSL spectral lines in the domain, and extract the equal ratio mean envelope array in the time domain; (3) After extracting the time domain and FTSL spectral line signal features of the speech signal, use the combined classifier recognition algorithm combined with the time domain The equal ratio envelope mean array and FTSL spectral line feature can automatically classify the speech signal, and output the classification result. Compared with the existing technology, the detection results are objective and accurate, and a higher degree of automatic measurement is realized. It provides reliable reference data for the digital evaluation of pharyngeal fricatives in clinical practice, meets the development needs of precision medicine, and performs more accurate and effective signal classification. identify.

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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